Massmutual Premier Funds NPORT-P MassMutual Premier Core Bond Fund (Dec 2020 report)

MassMutual Premier Short-Duration Bond Fund —  Portfolio of Investments

December 31, 2020 (Unaudited)

	Principal Amount		Value
BONDS & NOTES — 96.6%
CORPORATE DEBT — 45.0%
Agriculture — 1.0%
BAT Capital Corp.
3.222% 8/15/24	$	1,100,000	$	1,190,884
Imperial Brands Finance PLC
3.125% 7/26/24 (a)		1,043,000		1,116,999
3.500% 2/11/23 (a)		979,000		1,024,898
Reynolds American, Inc.
4.450% 6/12/25		585,000		666,312
				3,999,093
Airlines — 0.1%
Delta Air Lines, Inc./SkyMiles IP Ltd.
4.500% 10/20/25 (a)		408,000		436,094
Auto Manufacturers — 2.2%
Ford Motor Credit Co. LLC
3 mo. USD LIBOR + .810% 1.048% FRN 4/05/21		660,000		657,172
3 mo. USD LIBOR + 1.235% 1.456% FRN 2/15/23		1,130,000		1,090,486
3.087% 1/09/23		625,000		635,903
3.350% 11/01/22		935,000		951,363
General Motors Co.
6.125% 10/01/25		282,000		342,057
General Motors Financial Co., Inc.
3.250% 1/05/23		2,106,000		2,208,369
Harley-Davidson Financial Services, Inc.
3.350% 6/08/25 (a)		452,000		489,602
Hyundai Capital America
2.375% 2/10/23 (a)		1,510,000		1,556,240
2.850% 11/01/22 (a)		310,000		321,253
Nissan Motor Acceptance Corp.
1.900% 9/14/21 (a)		485,000		488,355
				8,740,800
Banks — 8.9%
ABN AMRO Bank NV
4.750% 7/28/25 (a)		985,000		1,133,588
Africa Finance Corp.
3.125% 6/16/25 (a)		2,075,000		2,139,844
Banco Santander SA
2.746% 5/28/25		1,200,000		1,281,030
3.500% 4/11/22		430,000		446,535
Bank of America Corp. 3 mo. USD LIBOR + .930%
2.816% VRN 7/21/23		3,230,000		3,354,132
The Bank of Nova Scotia
4.500% 12/16/25		1,786,000		2,082,373

MassMutual Premier Short-Duration Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Barclays Bank PLC
10.179% 6/12/21 (a)	$	1,522,000	$	1,582,954
Barclays PLC 3 mo. USD LIBOR + 1.380%
1.601% FRN 5/16/24		595,000		603,021
BPCE SA
5.700% 10/22/23 (a)		1,895,000		2,144,834
Citigroup, Inc.
4.400% 6/10/25		1,965,000		2,246,596
Credit Suisse AG
6.500% 8/08/23 (a)		1,750,000		1,968,372
Danske Bank A/S
5.000% 1/12/22 (a)		1,080,000		1,127,475
Deutsche Bank AG SOFR + 2.159%
2.222% VRN 9/18/24		1,525,000		1,568,827
Discover Bank
4.200% 8/08/23		1,000,000		1,093,315
The Goldman Sachs Group, Inc.
4.250% 10/21/25		3,695,000		4,237,431
HSBC Holdings PLC
4.250% 3/14/24		2,025,000		2,234,270
Morgan Stanley
SOFR + 1.990% 2.188% VRN 4/28/26		630,000		665,432
4.100% 5/22/23		984,000		1,067,871
Societe Generale SA 1 year CMT + 1.100%
1.488% VRN 12/14/26 (a)		1,119,000		1,128,885
Sumitomo Mitsui Financial Group, Inc.
1.474% 7/08/25		780,000		798,829
2.448% 9/27/24		855,000		910,582
3.748% 7/19/23		364,000		393,990
Synchrony Bank
3.000% 6/15/22		750,000		774,473
UBS Group AG
4.125% 9/24/25 (a)		840,000		961,849
				35,946,508
Beverages — 1.0%
Bacardi Ltd.
4.450% 5/15/25 (a)		1,756,000		1,960,321
Molson Coors Beverage Co.
3.000% 7/15/26		1,380,000		1,504,437
3.500% 5/01/22		720,000		748,689
				4,213,447
Chemicals — 1.5%
Alpek SAB de CV
4.500% 11/20/22 (a)		894,000		944,297
DuPont de Nemours, Inc.
4.493% 11/15/25		1,660,000		1,937,801
LYB International Finance III LLC
1.250% 10/01/25		400,000		407,006
Nutrition & Biosciences, Inc.
1.230% 10/01/25 (a)		800,000		808,491
RPM International, Inc.
3.450% 11/15/22		43,000		44,667
Syngenta Finance NV
4.441% 4/24/23 (a)		1,460,000		1,532,171

MassMutual Premier Short-Duration Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
4.892% 4/24/25 (a)	$	565,000	$	606,389
				6,280,822
Commercial Services — 0.8%
Adani Ports & Special Economic Zone Ltd.
3.375% 7/24/24 (a)		3,129,000		3,254,598
Computers — 1.1%
Dell International LLC / EMC Corp.
4.000% 7/15/24 (a)		763,000		841,304
5.850% 7/15/25 (a)		836,000		1,003,883
Genpact Luxembourg Sarl
3.700% STEP 4/01/22		1,480,000		1,509,014
Leidos, Inc.
2.950% 5/15/23 (a)		910,000		957,417
				4,311,618
Diversified Financial Services — 4.2%
AerCap Ireland Capital DAC/AerCap Global Aviation Trust
2.875% 8/14/24		2,190,000		2,277,569
4.500% 9/15/23		590,000		639,691
Aircastle Ltd.
5.000% 4/01/23		2,390,000		2,547,512
Antares Holdings LP
6.000% 8/15/23 (a)		1,172,000		1,195,233
Avolon Holdings Funding Ltd.
2.875% 2/15/25 (a)		815,000		831,028
BGC Partners, Inc.
4.375% 12/15/25 (a)		785,000		830,348
Brookfield Finance, Inc.
4.000% 4/01/24		1,160,000		1,273,317
Lazard Group LLC
3.750% 2/13/25		1,840,000		2,043,337
LeasePlan Corp. NV
2.875% 10/24/24 (a)		920,000		972,125
Park Aerospace Holdings Ltd.
5.250% 8/15/22 (a)		2,510,000		2,634,270
SPARC EM SPC Panama Metro Line 2 SP
0.000% 12/05/22 (a)		512,162		498,723
Synchrony Financial
2.850% 7/25/22		1,140,000		1,177,220
				16,920,373
Electric — 1.8%
Alliant Energy Finance LLC
1.400% 3/15/26 (a)		545,000		547,351
American Electric Power Co., Inc.
1.000% 11/01/25		995,000		1,006,842
Enel Finance International NV
2.875% 5/25/22 (a)		755,000		778,988
Entergy Texas, Inc.
2.550% 6/01/21		605,000		609,184
National Central Cooling Co. PJSC
2.500% 10/21/27 (a)		1,341,000		1,359,157
Pacific Gas and Electric Co.
1.750% 6/16/22		2,165,000		2,171,110

MassMutual Premier Short-Duration Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value		��
Puget Energy, Inc.
6.000% 9/01/21	$	740,000	$	765,823
				7,238,455
Gas — 0.4%
NiSource, Inc.
0.950% 8/15/25		1,505,000		1,514,090
Housewares — 0.5%
Newell Brands, Inc.
4.350% STEP 4/01/23		2,015,000		2,113,513
Insurance — 3.0%
AmTrust Financial Services, Inc.
6.125% 8/15/23		1,565,000		1,545,486
Athene Global Funding
2.750% 6/25/24 (a)		2,240,000		2,368,412
CNO Financial Group, Inc.
5.250% 5/30/25		1,515,000		1,758,577
Enstar Group Ltd.
4.500% 3/10/22		1,800,000		1,868,449
Jackson National Life Global Funding
2.500% 6/27/22 (a)		1,040,000		1,072,859
Lincoln National Corp.
4.000% 9/01/23		310,000		338,141
Trinity Acquisition PLC
3.500% 9/15/21		595,000		605,659
Unum Group
3.875% 11/05/25		1,395,000		1,545,722
Willis Towers Watson PLC
5.750% 3/15/21		840,000		848,459
				11,951,764
Investment Companies — 1.8%
Ares Capital Corp.
4.200% 6/10/24		2,499,000		2,697,512
BlackRock TCP Capital Corp.
3.900% 8/23/24		835,000		872,443
4.125% 8/11/22		1,805,000		1,881,983
Sixth Street Specialty Lending, Inc.
3.875% 11/01/24		1,665,000		1,716,375
				7,168,313
Iron & Steel — 2.0%
Reliance Steel & Aluminum Co.
1.300% 8/15/25		810,000		822,692
Severstal OAO Via Steel Capital SA
3.150% 9/16/24 (a)		3,129,000		3,269,417
Steel Dynamics, Inc.
2.400% 6/15/25		375,000		398,576
2.800% 12/15/24		610,000		655,805
Vale Overseas Ltd.
6.250% 8/10/26		2,235,000		2,771,400
				7,917,890

MassMutual Premier Short-Duration Bond Fund —  Portfolio of Investments (Continued)

		Principal Amount		Value
Lodging — 0.7%
Las Vegas Sands Corp.
3.200% 8/08/24		$	2,165,000	$	2,293,112
Marriott International, Inc.
5.750% 5/01/25			389,000		455,014
					2,748,126
Machinery – Diversified — 0.3%
CNH Industrial Capital LLC
1.950% 7/02/23			275,000		283,097
3.875% 10/15/21			1,015,000		1,038,833
					1,321,930
Media — 1.1%
Sirius XM Radio, Inc.
3.875% 8/01/22 (a)			2,200,000		2,233,000
ViacomCBS, Inc.
4.750% 5/15/25			1,890,000		2,194,258
					4,427,258
Mining — 0.5%
Glencore Funding LLC
4.125% 5/30/23 (a)	��		1,480,000		1,600,546
Kinross Gold Corp.
5.125% 9/01/21			550,000		559,927
					2,160,473
Oil & Gas — 2.4%
Cenovus Energy, Inc.
3.000% 8/15/22			1,065,000		1,088,237
Continental Resources, Inc.
5.000% 9/15/22			1,017,000		1,018,526
EQT Corp.
3.000% 10/01/22			1,610,000		1,622,075
7.875% STEP 2/01/25			790,000		899,613
Occidental Petroleum Corp.
5.500% 12/01/25			2,340,000		2,439,707
Ovintiv Exploration, Inc.
5.625% 7/01/24			1,220,000		1,306,784
Petroleos Mexicanos
4.625% 9/21/23			1,115,000		1,158,206
					9,533,148
Pharmaceuticals — 1.4%
AbbVie, Inc.
3.800% 3/15/25			745,000		830,808
Cardinal Health, Inc. 3 mo. USD LIBOR + .770%
0.987% FRN 6/15/22			1,345,000		1,354,563
McKesson Corp.
0.900% 12/03/25			1,470,000		1,477,348
Mylan, Inc.
3.125% 1/15/23 (a)			875,000		918,446
Teva Pharmaceutical Finance Netherlands III BV
2.200% 7/21/21			654,000		652,365

MassMutual Premier Short-Duration Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Viatris, Inc.
1.650% 6/22/25 (a)	$	355,000	$	367,174
				5,600,704
Pipelines — 1.7%
Energy Transfer Operating LP
4.200% 9/15/23		2,020,000		2,177,211
EnLink Midstream Partners LP
4.400% 4/01/24		1,340,000		1,322,272
EQM Midstream Partners LP
4.750% 7/15/23		1,305,000		1,372,181
Plains All American Pipeline LP/PAA Finance Corp.
3.600% 11/01/24		224,000		238,727
4.650% 10/15/25		1,630,000		1,822,307
				6,932,698
Private Equity — 0.4%
Hercules Capital, Inc.
4.625% 10/23/22		1,495,000		1,519,786
Real Estate — 0.8%
Country Garden Holdings Co. Ltd.
8.000% 1/27/24 (a)		2,930,000		3,165,873
Real Estate Investment Trusts (REITS) — 2.8%
CubeSmart LP
4.375% 12/15/23		764,000		836,118
Essex Portfolio LP
3.500% 4/01/25		330,000		365,651
3.875% 5/01/24		424,000		466,345
Federal Realty Investment Trust
1.250% 2/15/26		765,000		779,042
Host Hotels & Resorts LP
3.750% 10/15/23		2,140,000		2,259,608
Service Properties Trust
4.350% 10/01/24		1,215,000		1,199,812
Tanger Properties LP
3.875% 12/01/23		1,325,000		1,376,220
Trust Fibra Uno
5.250% 1/30/26 (a)		1,475,000		1,663,062
VEREIT Operating Partnership LP
4.600% 2/06/24		1,410,000		1,550,691
4.625% 11/01/25		605,000		696,359
				11,192,908
Retail — 1.0%
O'Reilly Automotive, Inc.
3.800% 9/01/22		191,000		199,927
3.850% 6/15/23		1,706,000		1,827,674
QVC, Inc.
4.375% 3/15/23		1,850,000		1,940,187
				3,967,788
Semiconductors — 0.2%
Microchip Technology, Inc.
0.972% 2/15/24 (a)		700,000		701,713

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Storage & Warehousing — 0.4%
GLP China Holdings Ltd.  4.974% 2/26/24 (a)	$	1,584,000	$	1,696,646
Telecommunications — 1.0%
Juniper Networks, Inc.  1.200% 12/10/25		355,000		359,225
Qwest Corp 6.750% 12/01/21		1,255,000		1,312,918
Sprint Communications, Inc.  9.250% 4/15/22		800,000		874,704
Telefonaktiebolaget LM Ericsson  4.125% 5/15/22		1,406,000		1,462,240
				4,009,087
TOTAL CORPORATE DEBT (Cost $175,004,029)				180,985,516
Municipal Obligations — 0.1%
Louisiana State Public Facilities Authority, Revenue Bonds, Series 2011-A, Class A2, 3 mo. USD LIBOR 1.111% FRN 4/26/27		19,466		19,486
Pennsylvania Higher Education Assistance Agency, Revenue Bonds, Series 2006-2, Class B, 0.000% FRN 10/25/42 (b)		600,000		597,006
TOTAL MUNICIPAL OBLIGATIONS (Cost $611,216)				616,492
Non-U.S. Government Agency Obligations — 49.8%
Auto Floor Plan Asset-Backed Securities — 0.4%
Navistar Financial Dealer Note Master Owner Trust II Series 2019-1, Class C, 1 mo. USD LIBOR + .950% 1.098% FRN 5/25/24 (a)		856,000		853,333
Series 2019-1, Class D, 1 mo. USD LIBOR + 1.450% 1.598% FRN 5/25/24 (a)		768,000		767,686
				1,621,019
Automobile Asset-Backed Securities — 5.8%
Avis Budget Rental Car Funding AESOP LLC Series 2020-1A, Class C, 3.020% 8/20/26 (a)		5,143,000		5,008,891
Series 2019-3A, Class C, 3.150% 3/20/26 (a)		2,764,000		2,715,925
Series 2019-1A, Class C, 4.530% 3/20/23 (a)		633,000		639,369
Series 2018-1A, Class C, 4.730% 9/20/24 (a)		1,270,000		1,309,745
Carmax Auto Owner Trust, Series 2019-4, Class D 2.800% 4/15/26		1,399,000		1,410,239
Carvana Auto Receivables Trust, Series 2019-4A, Class D 3.070% 7/15/25 (a)		1,734,000		1,783,305
Exeter Automobile Receivables Trust, Series 2019-3A, Class D 3.110% 8/15/25 (a)		985,000		1,013,187
Hertz Fleet Lease Funding LP, Series 2019-1, Class D 3.440% 1/10/33 (a)		1,976,000		1,899,244
Hertz Vehicle Financing II LP Series 2019-3A, Class B, 3.030% 12/26/25 (a)		1,036,000		1,033,132
Series 2017-1A, Class B, 3.560% 10/25/21 (a)		1,430,000		1,427,238
Hertz Vehicle Financing LLC, Series 2018-3A, Class B 4.370% 7/25/24 (a)		950,000		949,952

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Santander Revolving Auto Loan Trust Series 2019-A, Class B, 2.800% 1/26/32 (a)	$	399,000	$	417,880
Series 2019-A, Class C, 3.000% 1/26/32 (a)		258,000		270,906
Series 2019-A, Class D, 3.450% 1/26/32 (a)		1,720,000		1,800,910
Westlake Automobile Receivables Trust, Series 2019-3A, Class E 3.590% 3/17/25 (a)		1,395,000		1,419,480
				23,099,403
Commercial Mortgage-Backed Securities — 5.7%
BAMLL Commercial Mortgage Securities Trust Series 2018-DSNY, Class C, 1 mo. USD LIBOR + 1.350% 1.509% FRN 9/15/34 (a)		300,000		290,295
Series 2019-BPR, Class DMP, 3.895% VRN 11/05/32 (a) (b)		1,110,000		954,997
Series 2019-BPR, Class CMP, 3.895% VRN 11/05/32 (a) (b)		800,000		737,223
Bear Stearns Commercial Mortgage Securities, Series 2007-T26, Class AM, 5.432% VRN 1/12/45 (b)		168,165		166,539
BHMS Mortgage Trust Series 2018-ATLS, Class A, 1 mo. USD LIBOR + 1.250% 1.409% FRN 7/15/35 (a)		1,880,000		1,833,230
Series 2018-ATLS, Class B, 1 mo. USD LIBOR + 1.500% 1.659% FRN 7/15/35 (a)		2,600,000		2,496,064
BX Commercial Mortgage Trust Series 2020-BXLP, Class E, 1 mo. USD LIBOR + 1.600% 1.759% FRN 12/15/36 (a)		1,881,278		1,848,947
Series 2018-IND, Class E, 1 mo. USD LIBOR + 1.700% 1.859% FRN 11/15/35 (a)		1,855,000		1,849,837
Series 2019-XL, Class E, 1 mo. USD LIBOR + 1.800% 1.959% FRN 10/15/36 (a)		742,351		737,964
Series 2019-XL, Class F, 1 mo. USD LIBOR + 2.000% 2.159% FRN 10/15/36 (a)		2,892,510		2,853,737
CAMB Commercial Mortgage Trust, Series 2019-LIFE, Class E, 1 mo. USD LIBOR + 2.150% 2.309% FRN 12/15/37 (a)		1,335,725		1,327,116
Commercial Mortgage Trust, Series 2015-DC1, Class B, 4.035% VRN 2/10/48 (b)		797,000		843,942
Credit Suisse Mortgage Capital Certificates, Series 2019-ICE4, Class D, 1 mo. USD LIBOR + 1.600% 1.759% FRN 5/15/36 (a)		820,000		811,808
GS Mortgage Securities Trust, Series 2015-GC34, Class C, 4.648% VRN 10/10/48 (b)		1,100,000		1,074,527
KNDL Mortgage Trust, Series 2019-KNSQ, Class E, 1 mo. USD LIBOR + 1.800% 1.959% FRN 5/15/36 (a)		739,000		735,376
Morgan Stanley Bank of America Merrill Lynch Trust, Series 2013-C7, Class B 3.769% 2/15/46		1,000,000		1,006,246
Morgan Stanley Capital I Trust, Series 2012-STAR, Class D, 3.926% VRN 8/05/34 (a) (b)		1,000,000		972,319
One New York Plaza Trust Series 2020-1NYP, Class C, 1 mo. USD LIBOR + 2.200% 2.359% FRN 1/15/26 (a)		1,319,000		1,319,395
Series 2020-1NYP, Class D, 1 mo. USD LIBOR + 2.750% 2.909% FRN 1/15/26 (a)		886,000		886,263
				22,745,825

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Home Equity Asset-Backed Securities — 0.0%
Credit Suisse Seasoned Loan Trust, Series 2006-1, Class A, 1 mo. USD LIBOR + .240% 0.388% FRN 10/25/34 (a)	$	154,905	$	153,867
Other Asset-Backed Securities — 23.3%
321 Henderson Receivables I LLC, Series 2006-2A, Class A1, 1 mo. USD LIBOR + .200% 0.359% FRN 6/15/41 (a)		173,353		167,892
Series 2006-1A, Class A1, 1 mo. USD LIBOR + .200% 0.359% FRN 3/15/41 (a)		79,973		78,930
AASET Trust Series 2017-1A, Class A, 3.967% 5/16/42 (a)		217,885		202,068
Series 2020-1A, Class B, 4.335% 1/16/40 (a)		489,753		419,964
Series 2018-2A, Class A, 4.454% 11/18/38 (a)		726,086		685,948
Adams Outdoor Advertising LP, Series 2018-1, Class A 4.810% 11/15/48 (a)		785,205		827,961
Affirm Asset Securitization Trust Series 2020-Z2, Class A, 1.900% 1/15/25 (a)		3,962,540		3,959,943
Series 2020-A, Class A, 2.100% 2/18/25 (a)		2,777,000		2,791,495
Series 2020-Z1, Class A, 3.460% 10/15/24 (a)		804,137		802,804
Arbor Realty Commercial Real Estate Notes, Series 2018-FL1, Class A, 1 mo. USD LIBOR + 1.150% 1.309% FRN 6/15/28 (a)		880,000		870,694
Bain Capital Credit CLO Ltd. Series 2016-2A, Class BR, 3 mo. USD LIBOR + 1.800% 2.037% FRN 1/15/29 (a)		500,000		500,000
Series 2020-2A, Class A, 3 mo. USD LIBOR + 1.850% 2.068% FRN 7/21/31 (a)		1,000,000		1,003,034
Benefit Street Partners CLO X Ltd., Series 2016-10A, Class A2R, 3 mo. USD LIBOR + 1.750% 1.987% FRN 1/15/29 (a)		1,500,000		1,499,994
BlueMountain CLO Ltd., Series 2013-1A, Class A1R2, 3 mo. USD LIBOR + 1.230% 1.448% FRN 1/20/29 (a)		978,767		978,764
BRE Grand Islander Timeshare Issuer LLC Series 2017-1A, Class A, 2.940% 5/25/29 (a)		214,418		215,317
Series 2019-A, Class B, 3.780% 9/26/33 (a)		613,034		619,760
Business Jet Securities LLC, Series 2020-1A, Class A 2.981% 11/15/35 (a)		553,350		560,812
Capital Automotive REIT, Series 2017-1A, Class A1 3.870% 4/15/47 (a)		570,033		570,841
Series 2020-1A, Class B1 4.170% 2/15/50 (a)		1,100,000		1,145,432
Castlelake Aircraft Securitization Trust, Series 2019-1A, Class A 3.967% 4/15/39 (a)		384,523		365,679
Castlelake Aircraft Structured Trust, Series 2018-1, Class A 4.125% 6/15/43 (a)		643,151		611,318
Cbam CLO Management Cbam, Series 2018-6A, Class A1R, 3 mo. USD LIBOR + 1.270% 1.507% FRN 1/15/31 (a)		1,500,000		1,500,064
Cedar Funding IX CLO Ltd., Series 2018-9A, Class A1, 3 mo. USD LIBOR + .980% 1.198% FRN 4/20/31 (a)		300,000		298,975
CF Hippolyta LLC, Series 2020-1, Class B1, 1 mo. USD LIBOR + 1.850%, 2.280% FRN 7/15/60 (a)		212,826		216,119

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
CIFC Funding IV Ltd., Series 2015-4A, Class A2R, 2.068% FRN 10/20/27 (a)	$	300,000	$	300,029
CLI Funding LLC, Series 2019-1A, Class A 3.710% 5/18/44 (a)		686,163		699,599
DB Master Finance LLC Series 2019-1A, Class A2I, 3.787% 5/20/49 (a)		624,100		636,271
Series 2019-1A, Class A2II, 4.021% 5/20/49 (a)		736,675		771,482
Domino's Pizza Master Issuer LLC, Series 2018-1A, Class A2I 4.116% 7/25/48 (a)		948,175		993,485
Elara HGV Timeshare Issuer LLC Series 2017-A, Class A, 2.690% 3/25/30 (a)		245,239		244,466
Series 2014-A, Class B, 3.020% VRN 2/25/27 (a) (b)		67,178		67,107
Series 2019-A, Class C, 3.450% 1/25/34 (a)		1,486,223		1,459,874
Elmwood CLO II Ltd., Series 2019-2A, Class A, 3 mo. USD LIBOR + 1.450% 1.668% FRN 4/20/31 (a)		1,250,000		1,251,100
FCI Funding LLC, Series 2019-1A, Class A 3.630% 2/18/31 (a)		197,467		200,532
GoldentTree Loan Management US CLO 1 Ltd., Series 2017-1A, Class B1R, 3 mo. USD LIBOR + 1.450% 1.668% FRN 4/20/29 (a)		500,000		498,048
Goodgreen Trust Series 2019-2A, Class A, 2.760% 10/15/54 (a)		1,358,425		1,404,055
Series 2016-1A, Class A, 3.230% 10/15/52 (a)		681,321		701,892
Series 2019-1A, Class A, 3.860% 10/15/54 (a)		575,130		607,883
Series 2018-1A, Class A, 3.930% VRN 10/15/53 (a) (b)		1,159,167		1,235,702
Hero Funding Trust Series 2017-3A, Class A1, 3.190% 9/20/48 (a)		689,956		710,668
Series 2017-2A, Class A1, 3.280% 9/20/48 (a)		160,693		166,046
Series 2016-4A, Class A1, 3.570% 9/20/47 (a)		398,022		417,288
Series 2017-2A, Class A2, 4.070% 9/20/48 (a)		132,393		138,055
Series 2018-1A, Class A2, 4.670% 9/20/48 (a)		782,898		838,209
Hilton Grand Vacations Trust Series 2019-AA, Class C, 2.840% 7/25/33 (a)		1,383,181		1,386,922
Series 2017-AA, Class B, 2.960% 12/26/28 (a)		278,161		280,420
Horizon Aircraft Finance I Ltd., Series 2018-1, Class A 4.458% 12/15/38 (a)		461,570		445,841
Horizon Aircraft Finance III Ltd. Series 2019-2, Class A, 3.425% 11/15/39 (a)		386,309		373,276
Series 2019-2, Class B, 4.458% 11/15/39 (a)		1,757,143		1,506,321
HPS Loan Management Ltd., Series 15A-19, Class A1, 3 mo. USD LIBOR + 1.320% 1.536% FRN 7/22/32 (a)		500,000		500,279
KDAC Aviation Finance Ltd., Series 2017-1A, Class A 4.212% 12/15/42 (a)		380,897		343,553
KKR CLO Ltd., Series 28A, Class A, 3 mo. USD LIBOR + 1.140% 1.357% FRN 3/15/31 (a)		400,000		398,981
KREF Ltd., Series 2018-FL1, Class AS, 1 mo. USD LIBOR + 1.350% 1.503% FRN 6/15/36 (a)		2,600,000		2,593,612
Lendmark Funding Trust, Series 2018-1A, Class A 3.810% 12/21/26 (a)		930,000		941,447
Lunar Aircraft Ltd., Series 2020-1A, Class A 3.376% 2/15/45 (a)		439,449		415,035
MACH 1 Cayman Ltd., Series 2019-1, Class A 3.474% 10/15/39 (a)		889,077		858,888
Marlette Funding Trust, Series 2019-2A, Class B 3.530% 7/16/29 (a)		540,000		552,115

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Milos CLO Ltd., Series 2017-1A, Class AR, 3 mo. USD LIBOR + 1.070% 1.288% FRN 10/20/30 (a)	$	1,150,000	$	1,143,873
Mosaic Solar Loans LLC Series 2018-2GS, Class A, 4.200% 2/22/44 (a)		604,306		650,709
Series 2017-1A, Class A, 4.450% 6/20/42 (a)		137,199		147,548
Neuberger Berman CLO Ltd., Series 2015-20A, Class BR, 3 mo. USD LIBOR + 1.250% 1.487% FRN 1/15/28 (a)		1,500,000		1,488,116
NP SPE II LLC Series 2019-1A, Class A1, 2.574% 9/20/49 (a)		464,644		464,767
Series 2017-1A, Class A1, 3.372% 10/21/47 (a)		377,054		389,943
NRZ Advance Receivables Trust, Series 2020-T3, Class DT3 2.458% 10/15/52 (a)		899,000		899,008
Oak Street Investment Grade Net Lease Fund, Series 2020-1A, Class A3 2.260% 11/20/50 (a)		853,000		852,114
OCP CLO Ltd., Series 2015-8A, Class A2AR, 3 mo. USD LIBOR + 1.450% 1.668% FRN 4/17/27 (a)		2,150,000		2,149,613
OneMain Financial Issuance Trust, Series 2019-2A, Class C 3.660% 10/14/36 (a)		1,550,000		1,600,047
Orange Lake Timeshare Trust Series 2016-A, Class B, 2.910% 3/08/29 (a)		359,618		357,484
Series 2019-A, Class D, 4.930% 4/09/38 (a)		1,264,493		1,221,156
Oxford Finance Funding Trust, Series 2020-1A, Class A2 3.101% 2/15/28 (a)		698,000		713,734
Palmer Square CLO Ltd., Series 2015-1A, Class A2R2, 3 mo. USD LIBOR + 1.650% 1.863% FRN 5/21/29 (a)		1,250,000		1,250,048
Pioneer Aircraft Finance Ltd., Series 2019-1, Class A 3.967% 6/15/44 (a)		681,467		647,375
PNMAC GMSR Issuer Trust, Series 2018-GT1, Class A, 1 mo. USD LIBOR + 2.850% 2.998% FRN 2/25/23 (a)		670,000		658,673
RAMP Trust, Series 2005-EFC1, Class M5, 1 mo. USD LIBOR + .975% 1.123% FRN 5/25/35		2,500,000		2,466,030
Recette CLO Ltd., Series 2015-1A, Class CR, 3 mo. USD LIBOR + 1.700% 1.918% FRN 10/20/27 (a)		700,000		699,266
Rockford Tower CLO Ltd. Series 2017-1A, Class BR, 3 mo. USD LIBOR + 1.450% 1.687% FRN 4/15/29 (a)		550,000		544,751
Series 2017-2A, Class BR, 3 mo. USD LIBOR + 1.500% 1.737% FRN 10/15/29 (a)		1,000,000		997,871
RR 3 Ltd., Series 2018-3A, Class A1R2, 3 mo. USD LIBOR + 1.090% 1.327% FRN 1/15/30 (a)		1,250,000		1,246,614
RR 6 Ltd., Series 2019-6A, Class A1A, 3 mo. USD LIBOR + 1.250% 1.487% FRN 4/15/30 (a)		325,000		325,006
SBA Tower Trust, Series 2014-2A, Class C, 3.869% STEP 10/15/49 (a)		1,030,000		1,101,372
Sierra Receivables Funding LLC Series 2016-3A, Class B, 2.630% 10/20/33 (a)		415,826		417,386
Series 2016-2A, Class B, 2.780% 7/20/33 (a)		635,005		634,512
Series 2019-3A, Class C, 3.000% 8/20/36 (a)		1,030,501		1,034,636
Series 2020-2A, Class C, 3.510% 7/20/37 (a)		234,647		239,730
Series 2019-3A, Class D, 4.180% 8/20/36 (a)		756,273		758,204
Series 2019-2A, Class D, 4.540% 5/20/36 (a)		573,814		574,859
Series 2019-1A, Class D, 4.750% 1/20/36 (a)		555,552		559,322
SoFi Consumer Loan Program Trust, Series 2019-3, Class D 3.890% 5/25/28 (a)		2,981,000		3,014,151

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
SpringCastle America Funding LLC, Series 2020-AA, Class A 1.970% 9/25/37 (a)	$	1,832,226	$	1,843,427
Stack Infrastructure Issuer LLC, Series 2020-1A, Class A2 1.893% 8/25/45 (a)		367,000		370,872
Store Master Funding I-VII, Series 2018-1A, Class A3 4.400% 10/20/48 (a)		1,235,417		1,267,382
TAL Advantage VII LLC, Series 2020-1A, Class B 3.820% 9/20/45 (a)		779,000		776,382
TICP CLO XI Ltd., Series 2018-11A, Class A, 1 mo. USD LIBOR + 1.180%, 1.398% FRN 10/20/31		850,000		850,003
TLF National Tax Lien Trust, Series 2017-1A, Class A 3.090% 12/15/29 (a)		706,380		711,161
Trafigura Securitisation Finance PLC, Series 2018-1A, Class B 4.290% 3/15/22 (a)		1,870,000		1,871,608
Treman Park CLO Ltd., Series 2015-1A, Class ARR, 3 mo. USD LIBOR + 1.070% 1.288% FRN 10/20/28 (a)		1,100,000		1,100,022
Trinity Rail Leasing LP, Series 2019-1A, Class A 3.820% 4/17/49 (a)		1,539,315		1,609,876
Trip Rail Master Funding LLC Series 2017-1A, Class A1, 2.709% 8/15/47 (a)		91,973		92,089
Series 2011-1A, Class A2, 6.024% 7/15/41 (a)		2,246,612		2,322,149
Triton Container Finance VIII LLC, Series 2020-1A, Class A 2.110% 9/20/45 (a)		1,272,373		1,284,700
Upstart Securitization Trust, Series 2020-3, Class A 1.702% 11/20/30 (a)		2,402,870		2,400,003
Vantage Data Centers LLC, Series 2020-1A, Class A2 1.645% 9/15/45 (a)		1,425,000		1,434,766
VSE VOI Mortgage LLC Series 2016-A, Class B, 2.740% 7/20/33 (a)		335,610		332,319
Series 2018-A, Class C, 4.020% 2/20/36 (a)		384,747		378,209
Welk Resorts LLC Series 2015-AA, Class A, 2.790% 6/16/31 (a)		81,844		81,823
Series 2017-AA, Class B, 3.410% 6/15/33 (a)		586,813		579,614
Willis Engine Structured Trust IV, Series 2018-A, Class A, 4.750% STEP 9/15/43 (a)		602,925		520,342
				93,906,954
Student Loans Asset-Backed Securities — 7.8%
Access Group, Inc., Series 2015-1, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 7/25/58 (a)		530,000		484,529
College Avenue Student Loans LLC Series 2018-A, Class A1, 1 mo. USD LIBOR + 1.200% 1.348% FRN 12/26/47 (a)		1,122,693		1,128,316
Series 2019-A, Class B, 3.810% 12/28/48 (a)		1,038,000		1,066,862
College Loan Corp. Trust I, Series 2005-2, Class B, 3 mo. USD LIBOR + .490% 0.727% FRN 1/15/37		480,580		432,098
Commonbond Student Loan Trust Series 2019-AGS, Class B, 3.040% 1/25/47 (a)		960,045		957,045
Series 2018-AGS, Class C, 3.820% 2/25/44 (a)		150,620		152,725
Series 2018-BGS, Class C, 4.120% 9/25/45 (a)		109,647		110,464
Series 2018-CGS, Class C, 4.350% 2/25/46 (a)		49,244		49,349
Series 2017-AGS, Class C, 5.280% 5/25/41 (a)		190,334		195,422
Credit Suisse ABS Repackaging Trust, Series 2013-A, Class B 2.500% 1/25/30 (a)		164,624		165,334

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Earnest Student Loan Program LLC, Series 2016-B, Class A1, 1 mo. USD LIBOR + 2.050% 2.200% FRN 2/26/35 (a)	$	167,248	$	158,231
EdLinc Student Loan Funding, Series 2017-A, Class A, PRIME - 1.150% 3.600% FRN 12/01/47 (a)		1,134,199		1,121,574
ELFI Graduate Loan Program LLC, Series 2018-A, Class B 4.000% 8/25/42 (a)		418,717		415,358
Laurel Road Prime Student Loan Trust Series 2017-C, Class B, 2.950% 11/25/42 (a)		418,373		413,858
Series 2019-A, Class BFX, 3.000% 10/25/48 (a)		522,946		528,972
Series 2017-B, Class CFX, 3.610% 8/25/42 (a)		452,896		431,586
Series 2018-B, Class BFX, 3.720% 5/26/43 (a)		546,147		555,294
Navient Private Education Refi Loan Trust, Series 2020-BA, Class B 2.770% 1/15/69 (a)		1,800,000		1,826,912
Navient Student Loan Trust, Series 2018-2A, Class A3, 1 mo. USD LIBOR + .750% 0.898% FRN 3/25/67 (a)		1,830,000		1,799,742
Nelnet Private Education Loan Trust Series 2016-A, Class A1A, 1 mo. USD LIBOR + 1.750% 1.898% FRN 12/26/40 (a)		126,826		127,396
Series 2016-A, Class A1B, 3.600% 12/26/40 (a)		151,877		152,600
Nelnet Student Loan Trust Series 2007-2A, Class A4A2, 28 day ARS 0.000% FRN 6/25/35 (a)		2,800,000		2,685,975
Series 2018-5A, Class B, 1 mo. USD LIBOR + 1.450% 1.599% FRN 2/25/67 (a)		1,000,000		939,966
Series 2015-3A, Class B, 1 mo. USD LIBOR + 1.500% 1.650% FRN 6/25/54 (a)		395,000		382,004
SLC Student Loan Trust, Series 2005-3, Class B, 3 mo. USD LIBOR + .250% 0.467% FRN 6/15/55		1,206,406		1,072,735
SLM Student Loan Trust Series 2006-2, Class R, 0.000% 1/25/41		3,391		1,865,050
Series 2006-7, Class B, 3 mo. USD LIBOR + .200% 0.415% FRN 1/27/42		2,917,524		2,585,151
Series 2005-6, Class B, 3 mo. USD LIBOR + .290% 0.505% FRN 1/25/44		1,224,413		1,092,062
Series 2005-9, Class B, 3 mo. USD LIBOR + .300% 0.515% FRN 1/25/41		908,251		842,463
Series 2005-8, Class B, 3 mo. USD LIBOR + .310% 0.525% FRN 1/25/55		440,905		408,080
Series 2003-11, Class B, 3 mo. USD LIBOR + .650% 0.867% FRN 12/15/38		348,413		319,731
SMB Private Education Loan Trust Series 2016-B, Class A2B, 1 mo. USD LIBOR + 1.450% 1.609% FRN 2/17/32 (a)		231,281		232,310
Series 2015-C, Class A3, 1 mo. USD LIBOR + 1.950% 2.109% FRN 8/16/32 (a)		1,350,000		1,366,886
SoFi Alternative Trust, Series 2019-C, Class PT, 4.974% VRN 1/25/45 (a) (b)		2,062,360		2,224,678
SoFi Professional Loan Program LLC Series 2018-A, Class R1, 0.000% 2/25/42 (a)		1,928,100		713,154
Series 2017-D, Class R1, 0.000% 9/25/40 (a)		2,333,800		675,542
Series 2018-B, Class R1, 0.000% 8/26/47 (a)		1,727,800		640,873
Series 2018-D, Class R1, 0.000% 2/25/48 (a)		2,069,700		457,611
Series 2019-A, Class R1, 0.000% 6/15/48 (a)		3,162,200		681,138
				31,459,076
Whole Loan Collateral Collateralized Mortgage Obligations — 6.8%
Angel Oak Mortgage Trust Series 2020-5, Class A2, 1.579% VRN 5/25/65 (a) (b)		871,651		876,021
Series 2020-5, Class A3, 2.041% VRN 5/25/65 (a) (b)		793,124		797,046
Series 2018-3, Class A3, 3.238% VRN 5/25/59 (a) (b)		1,443,733		1,461,896
Series 2019-6, Class M1, 3.389% VRN 11/25/59 (a) (b)		1,900,000		1,931,819

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Bank of America Mortgage Securities, Series 2004-G, Class 2A7, 3.076% VRN 8/25/34 (b)	$	21,896	$	21,462
Citigroup Mortgage Loan Trust Series 2019-IMC1, Class A3, 3.030% VRN 7/25/49 (a) (b)		836,725		853,842
Series 2019-IMC1, Class M1, 3.170% VRN 7/25/49 (a) (b)		1,798,000		1,854,252
Deephaven Residential Mortgage Trust Series 2018-1A, Class A2, 3.027% VRN 12/25/57 (a) (b)		306,137		308,439
Series 2019-4A, Class M1, 3.484% VRN 10/25/59 (a) (b)		1,300,000		1,319,483
Series 2018-2A, Class A3, 3.684% VRN 4/25/58 (a) (b)		955,325		954,543
Series 2018-3A, Class A3, 3.963% VRN 8/25/58 (a) (b)		211,834		214,613
Series 2018-4A, Class A3, 4.285% VRN 10/25/58 (a) (b)		879,785		880,492
JP Morgan Mortgage Trust Series 2018-1, Class A5, 3.500% VRN 6/25/48 (a) (b)		178,751		180,406
Series 2018-4, Class A15, 3.500% VRN 10/25/48 (a) (b)		31,788		31,758
Series 2017-6, Class A5, 3.500% VRN 12/25/48 (a) (b)		247,377		249,463
Merrill Lynch Mortgage Investors, Inc., Series 2004-A1, Class IIA2, 2.996% VRN 2/25/34 (b)		63,108		61,429
MFA Trust Series 2020-NQM1, Class A2, 1.787% VRN 8/25/49 (a) (b)		1,431,775		1,446,004
Series 2020-NQM1, Class A3, 2.300% VRN 8/25/49 (a) (b)		1,668,644		1,673,197
New Residential Mortgage Loan Trust Series 2019-NQM2, Class A3, 3.752% VRN 4/25/49 (a) (b)		669,601		682,141
Series 2019-NQM1, Class A3, 3.928% VRN 1/25/49 (a) (b)		1,071,234		1,092,343
Onslow Bay Financial LLC, Series 2020-INV1, Class A21, 3.500% VRN 12/25/49 (a) (b)		1,266,057		1,294,125
PSMC Trust Series 2018-1, Class A3, 3.500% VRN 2/25/48 (a) (b)		250,284		251,932
Series 2018-2, Class A3, 3.500% VRN 6/25/48 (a) (b)		154,728		155,087
Sequoia Mortgage Trust, Series 2018-5, Class A4, 3.500% VRN 5/25/48 (a) (b)		131,567		132,043
Starwood Mortgage Residential Trust, Series 2019-INV1, Class A3, 2.916% VRN 9/27/49 (a) (b)		1,372,537		1,408,853
TIAA Bank Mortgage Loan Trust, Series 2018-2, Class A4, 3.500% VRN 7/25/48 (a) (b)		77,208		77,351
Verus Securitization Trust Series 2020-1, Class M1, 3.021% VRN 1/25/60 (a) (b)		2,551,000		2,559,697
Series 2019-4, Class M1, 3.207% VRN 11/25/59 (a) (b)		1,100,000		1,108,531
Series 2019-INV2, Class A3, 3.219% VRN 7/25/59 (a) (b)		1,505,169		1,549,116
Series 2019-INV3, Class M1, 3.279% VRN 11/25/59 (a) (b)		667,000		682,727
Series 2020-4, Class M1, 3.291% VRN 5/25/65 (a) (b)		1,254,000		1,285,645
				27,395,756
TOTAL NON-U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $202,569,670)				200,381,900
U.S. Government Agency Obligations and Instrumentalities — 1.3%
Pass-Through Securities — 0.0%
Federal Home Loan Mortgage Corp. Pool #1Q0239, 1 year CMT + 2.212% 3.235% 3/01/37		117,424		124,048
Federal National Mortgage Association Pool #775539 12 mo. USD LIBOR + 1.641% 2.516% 5/01/34		16,248		16,891
Government National Mortgage Association Pool #507545 7.500% 8/15/29		23,690		27,525
				168,464

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Whole Loans — 1.3%
Federal Home Loan Mortgage Corp. Structured Agency Credit Risk Debt Notes Series 2020-DNA5, Class M2, SOFR + 2.800% 2.882% FRN 10/25/50 (a)	$	1,236,000	$	1,249,155
Series 2020-DNA3, Class M2, 1 mo. USD LIBOR + 3.000% 3.148% FRN 6/25/50 (a)		3,218,000		3,235,501
Federal National Mortgage Association Connecticut Avenue Securities Trust Series 2019-R03, Class 1M2, 1 mo. USD LIBOR + 2.150% 2.298% FRN 9/25/31 (a)		83,208		82,926
Series 2019-R02, Class 1M2, 1 mo. USD LIBOR + 2.300% 2.448% FRN 8/25/31 (a)		536,780		535,053
				5,102,635
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES (Cost $5,223,557)				5,271,099
U.S. Treasury Obligations — 0.4%
U.S. Treasury Bonds & Notes — 0.4%
U.S. Treasury Note 8.000% 11/15/21 (c)		1,720,000		1,836,604
TOTAL U.S. TREASURY OBLIGATIONS (Cost $1,962,681)				1,836,604
TOTAL BONDS & NOTES (Cost $385,371,153)				389,091,611
TOTAL PURCHASED OPTIONS (#) — 0.1% (Cost $609,046)				391,060
TOTAL LONG-TERM INVESTMENTS (Cost $385,980,199)				389,482,671
Short-Term Investments — 9.7%
Commercial Paper — 9.2%
Ameren Corp. 0.152% 1/04/21		4,000,000		3,999,933
American Honda Finance Corp. 0.213% 1/05/21		2,000,000		1,999,943
0.243% 2/08/21		1,000,000		999,661
0.274% 2/16/21		2,000,000		1,999,175
Centerpoint Energy, Inc. 0.213% 1/06/21 (a)		3,000,000		2,999,944
Intercontinental Exchange, Inc. 0.355% 4/05/21 (a)(d)		4,000,000		3,995,808
National Grid PLC 0.254% 1/06/21 (a)		2,000,000		1,999,957
NiSource, Inc. 0.254% 1/14/21 (a)		3,000,000		2,999,805
Standard Chartered Bank 0.284% 5/10/21 (a)		1,000,000		999,231
Suncor Energy, Inc. 0.254% 1/07/21 (a)		4,000,000		3,999,883
0.325% 3/03/21 (a)		1,000,000		999,551
Telus Corp. 0.162% 2/04/21 (a)		5,000,000		4,998,897

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Vodafone Group PLC  0.355% 1/04/21 (a)	$	5,000,000	$	4,999,917
				36,991,705
Repurchase Agreement — 0.5%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (e)		1,933,003		1,933,003
TOTAL SHORT-TERM INVESTMENTS (Cost $38,925,266)				38,924,708
TOTAL INVESTMENTS — 106.4% (Cost $424,905,465) (f)				428,407,379
Other Assets/(Liabilities) — (6.4)%				(25,904,209	)
NET ASSETS — 100.0%			$	402,503,170

Abbreviation Legend

ARS Auction Rate Security

CLO Collateralized Loan Obligation

FRN Floating Rate Note

STEP Step Up Bond

VRN Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Security is exempt from registration under Regulation S or Rule 144A of the Securities Act of 1933. These securities are considered restricted and may be resold in transactions exempt from registration. At December 31, 2020, the aggregate market value of these securities amounted to $275,194,225 or 68.37% of net assets.

(b) Certain variable rate securities are not based on a published reference rate and spread but are determined by the issuer or agent and are based on current market conditions. These securities do not indicate a reference rate and spread in their description above. The rates shown are the current interest rates at December 31, 2020.

(c) A portion of this security is pledged/held as collateral for open derivatives.

(d) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At December 31, 2020, these securities amounted to a value of $3,995,808 or 0.99% of net assets.

(e) Maturity value of $1,933,003. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $1,971,704.

(f) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Short-Duration Bond Fund — Portfolio of Investments (Continued)

(#) Interest Rate Swaptions Purchased

			Paid by Fund		Received by Fund
Description	Counterparty	Expiration Date	Rate	Frequency	Rate	Frequency	Notional Amount		Value		Premium Paid (Received)		Unrealized Appreciation/ (Depreciation)
Call
10-Year Interest Rate Swap, 12/15/42	Barclays Bank PLC	12/13/32	3-Month USD LIBOR BBA	Quarterly	2.44%	Semi-Annually	USD	800,000	$	80,160	$	39,994	$	40,166
Put
10-Year Interest Rate Swap, 2/02/43	Credit Suisse International	1/31/33	3.11%	Semi-Annually	3-Month USD LIBOR BBA	Quarterly	USD	11,880,000	$	310,900	$	569,052	$	(258,152	)
									$	391,060	$	609,046	$	(217,986	)

Futures contracts
	Expiration Date	Number of Contracts		Notional Amount			Value/ Net Unrealized Appreciation/ (Depreciation)
Long
U.S. Treasury Note 10 Year	3/22/21		337	$	46,543,953		$	(11,625	)
Short
90 Day Eurodollar	3/15/21		4	$	(975,487	)	$	(22,813	)
U.S. Treasury Ultra 10 Year	3/22/21		116		(18,247,877	)		110,189
U.S. Treasury Note 2 Year	3/31/21		231		(50,988,937	)		(56,649	)
U.S. Treasury Note 5 Year	3/31/21		1,217		(153,186,078	)		(355,587	)
90 Day Eurodollar	9/13/21		8		(1,951,273	)		(45,327	)
90 Day Eurodollar	3/14/22		7		(1,706,839	)		(40,011	)
90 Day Eurodollar	9/19/22		6		(1,462,405	)		(34,520	)
90 Day Eurodollar	3/13/23		5		(1,217,921	)		(28,892	)
90 Day Eurodollar	12/18/23		7		(1,703,516	)		(37,997	)
90 Day Eurodollar	12/16/24		19		(4,618,125	)		(96,250	)
							$	(607,857	)

Currency Legend

USD U.S. Dollar

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments

December 31, 2020 (Unaudited)

	Principal Amount		Value
Bonds & Notes — 80.6%
Non-U.S. Government Agency Obligations — 53.3%
Auto Floor Plan Asset-Backed Securities — 2.0%
Navistar Financial Dealer Note Master Owner Trust II Series 2019-1, Class A, 1 mo. USD LIBOR + .640% 0.788% FRN 5/25/24 (a)	$	2,800,000	$	2,803,795
Series 2019-1, Class B, 1 mo. USD LIBOR + .750% 0.898% FRN 5/25/24 (a)		3,159,000		3,154,613
Series 2019-1, Class C, 1 mo. USD LIBOR + .950% 1.098% FRN 5/25/24 (a)		1,611,000		1,605,980
				7,564,388
Automobile Asset-Backed Securities — 8.9%
American Credit Acceptance Receivables Trust, Series 2018-3, Class C 3.750%  10/15/24 (a)		1,674,107		1,681,920
AmeriCredit Automobile Receivables Trust, Series 2020-2, Class A2A 0.600%  12/18/23		3,325,174		3,331,243
Avis Budget Rental Car Funding AESOP LLC Series 2019-1A, Class C, 4.530% 3/20/23 (a)		322,000		325,240
Series 2016-1A, Class C, 4.940% 6/20/22 (a)		1,150,000		1,155,440
CarMax Auto Owner Trust Series 2016-4, Class B, 1.920% 7/15/22		310,000		310,000
Series 2017-1, Class C, 2.840% 10/17/22		320,000		321,463
Series 2017-2, Class D, 3.390% 10/16/23		2,650,000		2,681,639
Exeter Automobile Receivables Trust, Series 2020-2A, Class A 1.130%  8/15/23 (a)		475,706		477,024
Hertz Vehicle Financing II LP Series 2016-4A, Class B, 3.290% 7/25/22 (a)		2,000,000		1,993,342
Series 2017-1A, Class B, 3.560% 10/25/21 (a)		2,430,000		2,425,307
Series 2019-1A, Class B, 4.100% 3/25/23 (a)		2,000,000		2,001,859
Series 2017-2A, Class C, 5.310% 10/25/23 (a)		1,750,000		1,729,532
OneMain Direct Auto Receivables Trust, Series 2018-1A, Class A 3.430%  12/16/24 (a)		490,897		495,789
OSCAR US Funding Trust IX LLC, Series 2018-2A, Class A3 3.390%  9/12/22 (a)		2,103,490		2,121,824
OSCAR US Funding X LLC, Series 2019-1A, Class A2 3.100%  4/11/22 (a)		914,550		916,909
OSCAR US Funding XI LLC, Series 2019-2A, Class A2 2.490%  8/10/22 (a)		2,663,343		2,676,882
Santander Drive Auto Receivables Trust, Series 2020-2, Class A2A 0.620%  5/15/23		3,600,011		3,603,122
Tesla Auto Lease Trust, Series 2018-B, Class A 3.710%  8/20/21 (a)		3,192,730		3,212,262

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
World Omni Auto Receivables Trust, Series 2019-C, Class A2B, 1 mo. USD LIBOR + .230% 0.389% FRN 2/15/23	$	3,009,387	$	3,010,613
				34,471,410
Commercial Mortgage-Backed Securities — 3.6%
BHMS Mortgage Trust, Series 2018-ATLS, Class B, 1 mo. USD LIBOR + 1.500% 1.659% FRN 7/15/35 (a)		1,150,000		1,104,028
BX Commercial Mortgage Trust Series 2020-BXLP, Class E, 1 mo. USD LIBOR + 1.600% 1.759% FRN 12/15/36 (a)		1,198,903		1,178,299
Series 2018-IND, Class E, 1 mo. USD LIBOR + 1.700% 1.859% FRN 11/15/35 (a)		1,449,000		1,444,967
Series 2019-XL, Class F, 1 mo. USD LIBOR + 2.000% 2.159% FRN 10/15/36 (a)		2,325,780		2,294,603
CAMB Commercial Mortgage Trust, Series 2019-LIFE, Class D, 1 mo. USD LIBOR + 1.750% 1.909% FRN 12/15/37 (a)		250,836		250,856
Credit Suisse Mortgage Capital Certificates, Series 2019-ICE4, Class D, 1 mo. USD LIBOR + 1.600% 1.759% FRN 5/15/36 (a)		6,000,000		5,940,058
DBJPM 17-C6 Mortgage Trust, Series 2017-C6, Class A1 1.907%  6/10/50		439,018		441,808
JP Morgan Chase Commercial Mortgage Securities Corp., Series 2018-LAQ, Class A, 1 mo. USD LIBOR + 1.000% 1.159% FRN 6/15/32 (a)		640,246		632,273
KNDL Mortgage Trust, Series 2019-KNSQ, Class E, 1 mo. USD LIBOR + 1.800% 1.959% FRN 5/15/36 (a)		389,000		387,093
				13,673,985
Home Equity Asset-Backed Securities — 2.3%
Argent Securities, Inc. Asset-Backed Pass-Through Certificates Series 2005-W2, Series 2005-W2, Class A2C, 1 mo. USD LIBOR + .720% 0.868% FRN 10/25/35		396,948		396,295
Centex Home Equity Loan Trust 2005-D, Series 2005-D, Class M3, 1 mo. USD LIBOR + .720% 0.868% FRN 10/25/35		3,379,546		3,364,175
JP Morgan Mortgage Acquisition Trust 2006-CW1, Series 2006-CW1, Class A5, 1 mo. USD LIBOR + .480% 0.628% FRN 5/25/36		1,906,589		1,899,121
Option One Mortgage Loan Trust Asset-Backed Certificates, Series 2005-5, Class M1, 1 mo. USD LIBOR + .585% 0.733% FRN 12/25/35		3,243,954		3,217,720
				8,877,311
Other Asset-Backed Securities — 19.6%
321 Henderson Receivables I LLC, Series 2006-2A, Class A1, 1 mo. USD LIBOR + .200% 0.359% FRN 6/15/41 (a)		671,655		650,498
321 Henderson Receivables LLC Series 2006-3A, Class A1, 1 mo. USD LIBOR + .200% 0.359% FRN 9/15/41 (a)		82,107		80,465
Series 2007-1A, Class A1, 1 mo. USD LIBOR + .200% 0.359% FRN 3/15/42 (a)		404,786		391,041

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
AASET Trust Series 2017-1A, Class A, 3.967% 5/16/42 (a)	$	129,893	$	120,463
Series 2018-2A, Class A, 4.454% 11/18/38 (a)		1,279,294		1,208,574
Affirm Asset Securitization Trust Series 2020-Z2, Class A, 1.900% 1/15/25 (a)		3,732,160		3,729,714
Series 2020-Z1, Class A, 3.460% 10/15/24 (a)		2,390,279		2,386,318
AIMCO CLO, Series 2015-AA, Class AR, 3 mo. USD LIBOR + .850% 1.087% FRN 1/15/28 (a)		1,345,560		1,342,733
Arbor Realty Commercial Real Estate Notes, Series 2018-FL1, Class A, 1 mo. USD LIBOR + 1.150% 1.309% FRN 6/15/28 (a)		920,000		910,271
Avant Loans Funding Trust, Series 2019-B, Class A 2.720%  10/15/26 (a)		442,139		443,468
Avery Point IV CLO Ltd., Series 2014-1A, Class AR, 3 mo. USD LIBOR + 1.100% 1.315% FRN 4/25/26 (a)		149,551		149,571
Carlyle Global Market Strategies CLO Ltd., Series 2013-2A, Class AR, 3 mo. USD LIBOR + .890% 1.108% FRN 1/18/29 (a)		1,877,537		1,866,809
First Franklin Mortgage Loan Trust, Series 2005-FF9, Class A4, 1 mo. USD LIBOR + .720% 0.868% FRN 10/25/35		1,473,200		1,464,806
KREF Ltd. Series 2018-FL1, Class A, 1 mo. USD LIBOR + 1.100% 1.253% FRN 6/15/36 (a)		4,300,000		4,292,713
Series 2018-FL1, Class AS, 1 mo. USD LIBOR + 1.350% 1.503% FRN 6/15/36 (a)		1,520,000		1,516,265
Series 2018-FL1, Class D, 1 mo. USD LIBOR + 2.550% 2.703% FRN 6/15/36 (a)		2,110,000		2,058,534
LCM Ltd., Series 19A, Class AR, 3 mo. USD LIBOR + 1.240% 1.477% FRN 7/15/27 (a)		1,133,884		1,133,952
Lendmark Funding Trust, Series 2018-1A, Class A 3.810%  12/21/26 (a)		410,000		415,047
Magnetite XVIII Ltd., Series 2016-18A, Class AR, 3 mo. USD LIBOR + 1.080% 1.301% FRN 11/15/28 (a)		3,000,000		2,995,821
Marlette Funding Trust Series 2019-4A, Class A, 2.390% 12/17/29 (a)		3,212,187		3,237,446
Series 2019-3A, Class A, 2.690% 9/17/29 (a)		2,089,189		2,103,945
Series 2019-2A, Class A, 3.130% 7/16/29 (a)		2,514,725		2,536,148
Series 2019-1A, Class A, 3.440% 4/16/29 (a)		3,532,838		3,558,391
Series 2018-3A, Class B, 3.860% 9/15/28 (a)		1,635,029		1,640,401
Neuberger Berman CLO XX Ltd., Series 2015-20A, Class AR, 3 mo. USD LIBOR + .800% 1.037% FRN 1/15/28 (a)		1,337,976		1,334,278
NP SPE II LLC, Series 2019-1A, Class A1 2.574%  9/20/49 (a)		295,536		295,614
NRZ Advance Receivables Trust 2015-ON1, Series 2020-T3, Class CT3 1.814%  10/15/52 (a)		965,000		964,999
OCP CLO Ltd., Series 2015-10A, Class A1R, 3 mo. USD LIBOR + .820% 1.035% FRN 10/26/27 (a)		847,159		845,274
Onemain Financial Issuance Trust, Series 2018-1A, Class A 3.300%  3/14/29 (a)		3,779,000		3,813,288
Orange Lake Timeshare Trust, Series 2016-A, Class A 2.610%  3/08/29 (a)		628,225		632,310
PFS Financing Corp. Series 2019-B, Class A, 1 mo. USD LIBOR + .550% 0.709% FRN 9/15/23 (a)		600,000		600,534

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2019-B, Class B, 1 mo. USD LIBOR + .800% 0.959% FRN 9/15/23 (a)	$	1,100,000	$	1,096,933
Planet Fitness Master Issuer LLC, Series 2018-1A, Class A2I 4.262%  9/05/48 (a)		2,541,500		2,552,682
PNMAC GMSR Issuer Trust, Series 2018-GT1, Class A, 1 mo. USD LIBOR + 2.850% 2.998% FRN 2/25/23 (a)		270,000		265,436
RAMP Series 2006-RZ4 Trust, Series 2006-RZ4, Class A3, 1 mo. USD LIBOR + .270% 0.418% FRN 10/25/36		3,313,566		3,283,412
SCF Equipment Leasing LLC, Series 2020-1A, Class A2 0.680%  10/20/25 (a)		1,671,000		1,674,477
Sierra Receivables Funding LLC Series 2019-3A, Class C, 3.000% 8/20/36 (a)		1,846,313		1,853,722
Series 2019-1A, Class C, 3.770% 1/20/36 (a)		505,047		506,958
Series 2018-1A, Class B, 4.036% 4/20/35		526,889		539,093
Series 2019-3A, Class D, 4.180% 8/20/36 (a)		463,153		464,335
Series 2019-1A, Class D, 4.750% 1/20/36 (a)		324,072		326,271
SoFi Consumer Loan Program  Trust Series 2017-4, Class A, 2.500% 5/26/26 (a)		125,253		125,745
Series 2017-6, Class A2, 2.820% 11/25/26 (a)		894,709		898,384
Series 2018-1, Class A2, 3.140% 2/25/27 (a)		638,909		641,242
Series 2016-1A, Class A, 3.260% 8/25/25 (a)		1,363,502		1,371,869
SoFi Consumer Loan Program LLC, Series 2016-2A, Class B, 4.770% VRN 10/27/25 (a) (b)		1,583,648		1,591,840
Structured Asset Investment Loan Trust, Series 2005-2, Class M2, 1 mo. USD LIBOR + .735% 0.883% FRN 3/25/35		2,003,194		1,986,992
Trafigura Securitisation Finance PLC Series 2018-1A, Class A1, 1 mo. USD LIBOR + .730% 0.889% FRN 3/15/22 (a)		1,340,000		1,339,343
Series 2018-1A, Class A2, 3.730% 3/15/22 (a)		1,000,000		1,019,594
Upstart Securitization Trust Series 2020-3, Class A, 1.702% 11/20/30 (a)		3,758,643		3,754,158
Series 2018-2, Class C, 5.494% 12/22/25 (a)		1,316,146		1,334,194
Verizon Owner Trust., Series 2018-1A, Class A1A 2.820%  9/20/22 (a)		422,989		424,674
				75,771,045
Student Loans Asset-Backed Securities — 9.2%
Brazos Higher Education Authority, Inc., Series 2006-2, Class B2 1.659%  6/25/42		1,050,000		1,039,784
Chase Education Loan Trust, Series 2007-A, Class A4, 3 mo. USD LIBOR + .100% 0.351% FRN 6/28/39		2,813,911		2,674,907
College Loan Corp. Trust I, Series 2005-2, Class B, 3 mo. USD LIBOR + .490% 0.727% FRN 1/15/37		307,571		276,543
Commonbond Student Loan Trust, Series 2018-CGS, Class C 4.350%  2/25/46 (a)		24,622		24,674
DRB Prime Student Loan Trust Series 2016-R, Class A1, 1 mo. USD LIBOR + 1.900% 2.045% FRN 10/25/44 (a)		536,421		539,354
Series 2016-A, Class A1, 1 mo. USD LIBOR + 2.000% 2.148% FRN 4/25/40 (a)		218,309		216,091
ECMC Group Student Loan Trust Series 2017-1A, Class A, 1 mo. USD LIBOR + 1.200% 1.348% FRN 12/27/66 (a)		1,279,958		1,285,500

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2016-1A, Class A, 1 mo. USD LIBOR + 1.350% 1.498% FRN 7/26/66 (a)	$	1,347,906	$	1,367,052
EdLinc Student Loan Funding Trust, Series 2017-A, Class A, PRIME - 1.150% 3.600% FRN 12/01/47 (a)		354,437		350,492
Edsouth Indenture, No.10 LLC, Series 2015-2, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 12/25/58 (a)		750,000		739,150
ELFI Graduate Loan Program LLC, Series 2018-A, Class A1, 1 mo. USD LIBOR + .750% 0.898% FRN 8/25/42 (a)		1,185,253		1,176,899
Goal Capital Funding Trust, Series 2010-1, Class A, 3 mo. USD LIBOR + .700% 0.907% FRN 8/25/48 (a)		188,760		186,535
JP Morgan Student Loan Trust, Series 2007-A, Class B, 3 mo. USD LIBOR + .350% 0.572% FRN 6/28/39 (a)		281,296		253,803
KeyCorp Student Loan Trust, Series 2005-A, Class 2B, 3 mo. USD LIBOR + .730% 0.981% FRN 9/27/38		1,445,155		1,440,874
Laurel Road Prime Student Loan Trust Series 2017-C, Class A1, 0.698% FRN 11/25/42 (a) (b)		89,156		86,180
Series 2019-A, Class A1FX, 2.340% 10/25/48 (a)		450,996		442,257
Series 2018-B, Class A2FX, 3.540% 5/26/43 (a)		2,661,427		2,728,194
Navient Student Loan Trust Series 2016-7A, Class A, 1 mo. USD LIBOR + 1.150% 1.298% FRN 3/25/66 (a)		1,452,288		1,469,495
Series 2016-5A, Class A, 1 mo. USD LIBOR + 1.250% 1.398% FRN 6/25/65 (a)		1,530,522		1,544,312
Series 2019-3A, Class B, 1 mo. USD LIBOR + 1.550% 1.698% FRN 7/25/68 (a)		2,550,000		2,549,970
Nelnet Private Education Loan Trust, Series 2016-A, Class A1A, 1 mo. USD LIBOR + 1.750% 1.898% FRN 12/26/40 (a)		111,807		112,310
Nelnet Student Loan Trust Series 2005-2, Class B, 3 mo. USD LIBOR + .170% 0.406% FRN 3/23/37		523,365		446,389
Series 2006-2, Class B, 3 mo. USD LIBOR + .200% 0.415% FRN 1/25/38		391,556		334,714
Series 2006-3, Class B, 3 mo. USD LIBOR + .250% 0.501% FRN 6/25/41		245,881		212,436
Series 2004-3, Class B, 3 mo. USD LIBOR + .350% 0.565% FRN 10/25/40		625,527		564,911
Series 2014-2A, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 6/25/41 (a)		295,000		280,005
SLC Student Loan Trust Series 2006-2, Class B, 3 mo. USD LIBOR + .230% 0.447% FRN 12/15/39		310,443		277,253
Series 2005-2, Class B, 3 mo. USD LIBOR + .280% 0.497% FRN 3/15/40		1,036,911		906,187
SLM Private Credit Student Loan Trust, Series 2004-B, Class B, 3 mo. USD LIBOR + .470% 0.687% FRN 9/15/33		218,405		218,144
SLM Student Loan Trust Series 2006-5, Class A5, 3 mo. USD LIBOR + .110% 0.325% FRN 1/25/27		330,654		330,486
Series 2006-4, Class B, 3 mo. USD LIBOR + .200% 0.415% FRN 1/25/70		202,981		181,167
Series 2006-5, Class B, 3 mo. USD LIBOR + .210% 0.425% FRN 10/25/40		248,976		222,573
Series 2006-2, Class B, 3 mo. USD LIBOR + .220% 0.435% FRN 1/25/41		295,924		261,596
Series 2005-8, Class B, 3 mo. USD LIBOR + .310% 0.525% FRN 1/25/55		264,543		244,848
Series 2004-3, Class B, 3 mo. USD LIBOR + .470% 0.685% FRN 10/25/64		205,177		190,857
Series 2003-11, Class B, 3 mo. USD LIBOR + .650% 0.867% FRN 12/15/38		237,554		217,999
SMB Private Education Loan Trust Series 2019-A, Class A2B, 1 mo. USD LIBOR + .870% 1.029% FRN 7/15/36 (a)		1,684,164		1,677,021

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2014-A, Class A2B, 1 mo. USD LIBOR + 1.150% 1.309% FRN 5/15/26 (a)	$	531,003	$	531,920
SoFi Alternative Trust, Series 2019-C, Class PT, 4.974% VRN 1/25/45 (a) (b)		1,195,571		1,289,668
SoFi Professional Loan Program LLC Series 2019-C, Class A1FX, 2.130% 11/16/48 (a)		747,962		751,891
Series 2016-B, Class A2B, 2.740% 10/25/32 (a)		3,339,865		3,387,905
Series 2018-D, Class A2FX, 3.600% 2/25/48 (a)		2,452,479		2,544,641
				35,576,987
Whole Loan Collateral Collateralized Mortgage Obligations — 7.7%
Angel Oak Mortgage Trust, Series 2018-3, Class A3, 3.238% VRN 5/25/59 (a) (b)		620,805		628,616
BRAVO Residential Funding Trust, Series 2019-NQM1, Class A1, 2.666% VRN 7/25/59 (a) (b)		5,665,013		5,808,437
CIM Trust, Series 2019-INV3, Class A11, 1 mo. USD LIBOR + 1.000% 1.100% FRN 8/25/49 (a)		2,430,897		2,435,776
Citigroup Mortgage Loan Trust, Series 2019-IMC1, Class A3, 3.030% VRN 7/25/49 (a) (b)		746,375		761,643
Deephaven Residential Mortgage Trust Series 2019-4A, Class A3, 3.047% VRN 10/25/59 (a) (b)		3,062,927		3,078,280
Series 2019-2A, Class A1, 3.558% VRN 4/25/59 (a) (b)		531,601		539,843
Series 2018-4A, Class A3, 4.285% VRN 10/25/58 (a) (b)		943,193		943,950
HomeBanc Mortgage Trust, Series 2005-3, Class A1, 1 mo. USD LIBOR + .480% 0.628% FRN 7/25/35		2,518,868		2,504,900
JP Morgan Mortgage Trust Series 2018-1, Class A5, 3.500% VRN 6/25/48 (a) (b)		81,251		82,003
Series 2018-3, Class A5, 3.500% VRN 9/25/48 (a) (b)		182,691		184,750
Series 2017-6, Class A5, 3.500% VRN 12/25/48 (a) (b)		104,546		105,428
New Residential Mortgage Loan Trust Series 2019-NQM2, Class A3, 3.752% VRN 4/25/49 (a) (b)		373,064		380,050
Series 2019-NQM1, Class A3, 3.928% VRN 1/25/49 (a) (b)		683,766		697,240
Onslow Bay Financial LLC, Series 2020-EXP1, Class 2A2, 1 mo. USD LIBOR + .950% 1.098% FRN 2/25/60 (a)		1,366,350		1,368,467
PSMC Trust, Series 2018-1, Class A3, 3.500% VRN 2/25/48 (a) (b)		95,346		95,974
Sequoia Mortgage Trust, Series 2018-3, Class A4, 3.500% VRN 3/25/48 (a) (b)		110,841		111,763
Starwood Mortgage Residential Trust, Series 2019-INV1, Class A3, 2.916% VRN 9/27/49 (a) (b)		1,043,657		1,071,271
Verus Securitization Trust Series 2019-INV2, Class A3, 3.219% VRN 7/25/59 (a) (b)		1,220,407		1,256,040
Series 2019-2, Class A3, 3.448% VRN 5/25/59 (a) (b)		2,200,373		2,243,988
Series 2019-1, Class A1, 3.836% VRN 2/25/59 (a) (b)		1,533,449		1,554,996
Series 2019-1, Class A3, 4.040% VRN 2/25/59 (a) (b)		3,858,175		3,942,887
				29,796,302
TOTAL NON-U.S. GOVERNMENT AGENCY OBLIGATIONS  (Cost $205,251,143)				205,731,428
U.S. Government Agency Obligations and Instrumentalities — 3.9%
Whole Loans — 3.9%
Federal Home Loan Mortgage Corp. Structured Agency Credit Risk Debt Notes Series 2020-DNA6, Class M1, SOFR + 0.900% 0.977% FRN 12/25/50 (a)		1,991,000		1,990,995

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2020-DNA5, Class M1, SOFR + 1.300% 1.382% FRN 10/25/50 (a)	$	1,774,000	$	1,778,533
Series 2020-DNA3, Class M1, 1 mo. USD LIBOR + 1.500% 1.648% FRN 6/25/50 (a)		3,526,598		3,531,337
Series 2020-DNA4, Class M1, 1 mo. USD LIBOR + 1.500% 1.648% FRN 8/25/50 (a)		4,371,289		4,383,280
Series 2020-DNA5, Class M2, SOFR + 2.800% 2.882% FRN 10/25/50 (a)		1,525,000		1,541,231
Series 2020-DNA3, Class M2, 1 mo. USD LIBOR + 3.000% 3.148% FRN 6/25/50 (a)		1,250,000		1,256,798
Federal National Mortgage Association Connecticut Avenue Securities Trust, Series 2019-R03, Class 1M2, 1 mo. USD LIBOR + 2.150% 2.298% FRN 9/25/31 (a)		669,157		666,890
				15,149,064
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES  (Cost $15,134,043)				15,149,064
U.S. Treasury Obligations — 23.4%
U.S. Treasury Bonds & Notes — 23.4%
U.S. Treasury Inflation Index
0.125% 10/15/24		5,784,873		6,202,318
0.125% 4/15/25		1,008,070		1,084,410
0.125% 10/15/25		2,910,160		3,164,079
0.125% 7/15/26		3,334,820		3,667,217
0.125% 1/15/30		5,363,865		5,983,084
0.125% 7/15/30		6,905,876		7,746,091
0.250% 1/15/25		4,397,400		4,744,840
0.250% 7/15/29		4,504,429		5,098,568
0.250% 2/15/50		2,025,580		2,412,999
0.375% 7/15/25 (c)		3,129,300		3,436,811
0.500% 4/15/24		3,561,849		3,817,857
0.500% 1/15/28		1,477,868		1,675,610
0.625% 4/15/23		3,113,392		3,278,182
0.625% 1/15/24		2,231,868		2,395,276
0.625% 1/15/26		2,520,432		2,813,203
0.625% 2/15/43		1,132,510		1,411,199
0.750% 7/15/28		2,458,448		2,859,003
0.750% 2/15/42		1,267,574		1,612,856
0.750% 2/15/45		1,536,993		1,981,299
0.875% 1/15/29		3,712,392		4,362,447
0.875% 2/15/47		1,348,350		1,812,021
1.000% 2/15/46		549,440		749,005
1.000% 2/15/49		1,660,806		2,337,498
1.375% 2/15/44		2,625,538		3,779,441
2.000% 1/15/26		1,836,674		2,183,681
2.125% 2/15/40		843,297		1,305,738
2.125% 2/15/41		963,106		1,509,957
2.375% 1/15/25		966,959		1,129,856
3.625% 4/15/28		1,489,158		2,047,243
3.875% 4/15/29		2,455,061		3,537,109
				90,138,898
TOTAL U.S. TREASURY OBLIGATIONS (Cost $84,092,730)				90,138,898
TOTAL BONDS & NOTES   (Cost $304,477,916)				311,019,390
TOTAL PURCHASED OPTIONS (#) — 0.2% (Cost $1,137,772)				740,413
TOTAL LONG-TERM INVESTMENTS (Cost $305,615,688)				311,759,803

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Short-Term Investments — 21.0%
Commercial Paper — 19.7%
Agilent Technologies, Inc. 0.304% 2/25/21 (a)	$	2,000,000	$	1,999,235
American Electric Power Co., Inc. 0.294% 1/26/21 (a)		3,274,000		3,273,511
American Honda Finance Corp. 0.294% 3/03/21		5,000,000		4,997,227
Entergy Corp. 0.386% 5/17/21 (a)		5,000,000		4,993,150
FMC Technologies, Inc. 0.274% 2/05/21 (a)		5,000,000		4,998,860
Intercontinental Exchange, Inc. 0.406% 6/08/21 (a) (d)		3,000,000		2,993,940
0.406% 6/29/21 (a) (d)		2,000,000		1,995,230
Parker-Hannifin Corp. 0.274%  2/04/21 (a)		2,000,000		1,999,527
PPG Industries, Inc. 0.427%  8/02/21		5,000,000		4,988,379
Rogers Communications, Inc. 0.458%  8/25/21 (a)		4,000,000		3,989,625
Schlumberger Holdings Corp. 0.407% 7/29/21 (a)		2,000,000		1,996,733
Spire, Inc. 0.304%  2/10/21 (a)		1,000,000		999,732
0.315% 3/23/21 (a)		3,400,000		3,397,870
Standard Chartered PLC 0.264%  6/30/21 (a)		5,000,000		4,993,715
Suncor Energy, Inc. 0.305%  1/29/21 (a)		1,000,000		999,825
0.325% 3/01/21 (a)		3,500,000		3,498,483
Telus Corp. 0.305%  4/27/21 (a)		2,000,000		1,997,946
0.305% 6/16/21 (a)		3,000,000		2,995,046
Transcanada Pipelines Ltd. 0.284%  1/21/21 (a)		1,000,000		999,889
VF Corp. 0.254% 2/08/21 (a)		4,000,000		3,999,151
Vodafone Group PLC 0.335% 1/06/21 (a)		2,000,000		1,999,950
Walgreens Boots Alliance, Inc. 0.406% 2/24/21 (a)		5,000,000		4,997,349
Walt Disney Co. 0.356% 7/16/21 (a)		2,000,000		1,996,345
Waste Management, Inc. 0.458% 9/15/21 (a)		5,000,000		4,989,035
				76,089,753

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Repurchase Agreement — 1.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (e)	$	4,994,427	$	4,994,427
TOTAL SHORT-TERM INVESTMENTS (Cost $81,075,746)				81,084,180
TOTAL INVESTMENTS — 101.8% (Cost $386,691,434) (f)				392,843,983
Other Assets/(Liabilities) — (1.8)%				(6,788,799	)
NET ASSETS — 100.0%			$	386,055,184

Abbreviation Legend

CLO	Collateralized Loan Obligation
FRN	Floating Rate Note
VRN	Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.
(a)	Security is exempt from registration under Regulation S or Rule 144A of the Securities Act of 1933. These securities are considered restricted and may be resold in transactions exempt from registration. At December 31, 2020, the aggregate market value of these securities amounted to $244,586,569 or 63.36% of net assets.
(b)	Certain variable rate securities are not based on a published reference rate and spread but are determined by the issuer or agent and are based on current market conditions.  These securities do not indicate a reference rate and spread in their description above. The rates shown are the current interest rates at December 31, 2020.
(c)	A portion of this security is pledged/held as collateral for open derivatives.
(d)	This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At December 31, 2020, these securities amounted to a value of $4,989,170 or 1.29% of net assets.
(e)	Maturity value of $4,994,427. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $5,094,368.
(f)	See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

(#) Interest Rate Swaptions Purchased

			Paid by Fund		Received by Fund
Description	Counterparty	Expiration Date	Rate	Frequency	Rate	Frequency	Notional Amount		Value		Premium Paid (Received)		Unrealized Appreciation/ (Depreciation)
Call
10-Year Interest Rate Swap, 12/15/42	Barclays Bank PLC	12/13/32	3-Month USD LIBOR BBA	Quarterly	2.44%	Semi-Annually	USD	1,219,750	$	122,219	$	60,978	$	61,241
Put
10-Year Interest Rate Swap, 12/15/42	Barclays Bank PLC	12/13/32	2.94%	Semi-Annually	3-Month USD LIBOR BBA	Quarterly	USD	14,190,000	$	417,470	$	709,401	$	(291,931	)
10-Year Interest Rate Swap, 2/02/43	Credit Suisse International	1/31/33	3.11%	Semi-Annually	3-Month USD LIBOR BBA	Quarterly	USD	7,670,000		200,724		367,393		(166,669	)
										618,194		1,076,794		(458,600	)
									$	740,413	$	1,137,772	$	(397,359	)

Futures contracts
	Expiration Date	Number of Contracts		Notional Amount			Value/ Net Unrealized Appreciation/ (Depreciation)
Long
U.S. Treasury Long Bond	3/22/21		18	$	3,142,735		$	(25,360	)
U.S. Treasury Note 2 Year	3/31/21		17		3,753,731			2,871
U.S. Treasury Note 5 Year	3/31/21		45		5,666,204			11,179
							$	(11,310	)
Short
U.S. Treasury Ultra 10 Year	3/22/21		37	$	(5,817,272	)	$	31,975
U.S. Treasury Ultra Bond	3/22/21		12		(2,602,264	)		39,514
							$	71,489

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

OTC Interest Rate Swaps

Paid by the Fund		Received by the Fund
Rate/ Reference	Frequency	Rate/ Reference	Frequency	Counterparty	Termination Date	Notional Amount		Value		Upfront Premium Paid/ (Received)		Unrealized Appreciation (Depreciation)
1.978%	Maturity	U.S. Consumer Price Index	Maturity	Bank of America N.A.	12/24/22	USD	12,000,000	$	21,785	$	—	$	21,785
1.823%	Maturity	U.S. Consumer Price Index	Maturity	BNP Paribas SA	2/04/22	USD	2,400,000		1,295		—		1,295
1.505%	Maturity	U.S. Consumer Price Index	Maturity	BNP Paribas SA	2/14/22	USD	6,000,000		12,119		—		12,119
1.833%	Maturity	U.S. Consumer Price Index	Maturity	Goldman Sachs & Co.	8/28/23	USD	1,500,000		20,680		—		20,680
1.880%	Maturity	U.S. Consumer Price Index	Maturity	Goldman Sachs & Co.	8/28/25	USD	2,000,000		35,840		—		35,840
1.180%	Maturity	U.S. Consumer Price Index	Maturity	Goldman Sachs International	6/22/22	USD	1,000,000		22,083		—		22,083
2.000%	Maturity	U.S. Consumer Price Index	Maturity	JP Morgan Chase Bank N.A.	12/24/23	USD	4,500,000		9,823		—		9,823
								$	123,625	$	—	$	123,625

MassMutual Premier Inflation-Protected and Income Fund — Portfolio of Investments (Continued)

OTC Total Return Swaps

Paid by the Fund		Received by the Fund
Rate/ Reference	Frequency	Rate/ Reference	Frequency	Counterparty	Termination Date	No. of Contracts/ Notional		Value		Upfront Premium Received (Paid)/ Received		Unrealized Appreciation (Depreciation)
0.25%	Maturity	Bloomberg Barclays US Treasury Inflation Notes TR Index	Maturity	Barclays Bank PLC	5/28/21		59,085,890	$	1,347,534	$	—	$	1,347,534
0.29%	Maturity	Bloomberg Barclays US Treasury Inflation Notes TR Index	Maturity	BNP Paribas SA	1/29/21		27,374,764		643,687		—		643,687
0.30%	Maturity	Bloomberg Barclays US Treasury Inflation Notes TR Index	Maturity	BNP Paribas SA	2/26/21		20,000,000		356,847		—		356,847
0.25%	Maturity	Bloomberg Barclays US Treasury Inflation Notes TR Index	Maturity	BNP Paribas SA	4/30/21		49,196,231		564,017		—		564,017
0.29%	Maturity	Bloomberg Barclays US Treasury Inflation Notes TR Index	Maturity	Goldman Sachs International	1/29/21		27,374,764		643,687		—		643,687
0.30%	Maturity	Bloomberg Barclays US Treasury Inflation Notes TR Index	Maturity	Goldman Sachs International	2/26/21		41,145,535		512,397		—		512,397
0.25%	Maturity	Bloomberg Barclays US Treasury Inflation Notes TR Index	Maturity	Goldman Sachs International	4/30/21		49,463,825		567,085		—		567,085
								$	4,635,254	$	—	$	4,635,254

Currency Legend

USD   U.S. Dollars

MassMutual Premier Core Bond Fund —  Portfolio of Investments

December 31, 2020 (Unaudited)

	Principal Amount		Value
Bonds & Notes — 99.0%
Corporate Debt — 37.2%
Aerospace & Defense — 0.2%
BAE Systems PLC 1.900% 2/15/31 (a)	$	775,000	$	783,489
Raytheon Technologies Corp.
4.500% 6/01/42		1,375,000		1,793,015
				2,576,504
Agriculture — 0.9%
BAT Capital Corp. 2.259% 3/25/28		930,000		965,383
4.700% 4/02/27		1,175,000		1,381,652
4.758% 9/06/49		805,000		933,283
Bunge Ltd. Finance Corp. 3.250% 8/15/26		1,383,000		1,537,154
4.350% 3/15/24		2,120,000		2,338,650
Imperial Brands Finance PLC 3.500% 7/26/26 (a)		1,675,000		1,853,992
3.875% 7/26/29 (a)		1,842,000		2,058,884
Reynolds American, Inc. 5.850% 8/15/45		1,025,000		1,310,719
				12,379,717
Airlines — 0.2%
Delta Air Lines, Inc./SkyMiles IP Ltd. 4.500% 10/20/25 (a)		1,258,000		1,344,625
Spirit Airlines Pass-Through Trust, Series 2015-1, Class A, 4.100% 10/01/29
		1,221,456		1,161,102
United Airlines Pass-Through Trust, Series 2018-1, Class B, 4.600% 9/01/27		448,794		444,022
				2,949,749
Auto Manufacturers — 1.7%
Ford Motor Credit Co. LLC 3.087% 1/09/23		1,790,000		1,821,227
4.140% 2/15/23		2,355,000		2,425,650
5.085% 1/07/21		1,163,000		1,163,000
General Motors Co. 4.200% 10/01/27		1,290,000		1,461,753
5.150% 4/01/38		785,000		943,845
General Motors Financial Co., Inc. 3.500% 11/07/24		2,990,000		3,231,171
4.150% 6/19/23		3,064,000		3,296,316
4.200% 11/06/21		1,466,000		1,511,031
Hyundai Capital America 2.850% 11/01/22 (a)		2,185,000		2,264,312

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
3.000% 2/10/27 (a)	$	5,775,000	$	6,269,201
				24,387,506
Banks — 5.6%
ABN AMRO Bank NV 4.750% 7/28/25 (a)
		412,000		474,151
Associated Banc-Corp.
4.250% 1/15/25		2,580,000		2,795,541
Bank of America Corp. SOFR + 2.150% 2.592% VRN 4/29/31		1,730,000		1,854,142
4.183% 11/25/27		1,380,000		1,600,918
3 mo. USD LIBOR + 1.814% 4.244% VRN 4/24/38		1,125,000		1,385,906
3 mo. USD LIBOR + 1.310% 4.271% VRN 7/23/29		615,000		732,309
6.110% 1/29/37		1,275,000		1,857,077
7.750% 5/14/38		1,055,000		1,798,783
The Bank of Nova Scotia 4.500% 12/16/25		1,885,000		2,197,801
3 mo. USD LIBOR + 2.648% 4.650% VRN (b)		3,550,000		3,567,750
Barclays Bank PLC 10.179% 6/12/21 (a)
		5,444,000		5,662,024
Barclays PLC 3 mo. USD LIBOR + 1.380% 1.601% FRN 5/16/24		2,290,000		2,320,869
4.337% 1/10/28		1,600,000		1,838,061
BPCE SA SOFR + 1.520% 1.652% VRN 10/06/26 (a)		2,860,000		2,926,731
4.625% 7/11/24 (a)		1,600,000		1,788,594
Citigroup, Inc. 4.450% 9/29/27		1,075,000		1,270,799
6.000% 10/31/33		510,000		700,935
6.625% 6/15/32		500,000		708,796
8.125% 7/15/39		225,000		402,196
Credit Suisse AG 6.500% 8/08/23 (a)		3,806,000		4,280,928
Deutsche Bank AG 3.150% 1/22/21		2,505,000		2,507,778
Discover Bank 5 year USD Swap + 1.730% 4.682% VRN 8/09/28		3,275,000		3,481,325
First Republic Bank 4.375% 8/01/46		4,530,000		5,733,877
Fulton Financial Corp. 3.600% 3/16/22		1,485,000		1,523,634
The Goldman Sachs Group, Inc. 4.250% 10/21/25		375,000		430,051
5.950% 1/15/27		1,333,000		1,680,313
6.250% 2/01/41		440,000		689,113
6.750% 10/01/37		1,065,000		1,629,622
HSBC Holdings PLC 4.250% 3/14/24		2,041,000		2,251,924
4.250% 8/18/25		1,739,000		1,975,804
JP Morgan Chase & Co. SOFR + 2.515% 2.956% VRN 5/13/31		1,350,000		1,480,398
5.600% 7/15/41		1,225,000		1,853,183
Morgan Stanley 4.350% 9/08/26		3,925,000		4,627,529
Nordea Bank Abp 5 year CMT + 4.110% 6.625% VRN  (a) (b)		1,492,000		1,712,070
Societe Generale SA 1 year CMT + 1.100% 1.488% VRN 12/14/26  (a)		1,869,000		1,885,511

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Valley National Bancorp 5.125% 9/27/23	$	1,710,000	$	1,862,449
Wells Fargo & Co. 5.375% 11/02/43		851,000		1,182,468
5.606% 1/15/44		620,000		878,725
				77,550,085
Beverages — 0.6%
Anheuser-Busch Cos. LLC/Anheuser-Busch InBev Worldwide, Inc. 4.900% 2/01/46		4,975,000		6,468,647
Molson Coors Beverage Co. 4.200% 7/15/46		1,689,000		1,938,062
5.000% 5/01/42		350,000		438,022
				8,844,731
Chemicals — 1.0%
CF Industries, Inc. 3.400% 12/01/21 (a)		650,000		665,244
DuPont de Nemours, Inc. 5.319% 11/15/38		2,075,000		2,810,394
Nutrition & Biosciences, Inc. 1.832% 10/15/27 (a)		980,000		1,010,051
Syngenta Finance NV  4.441% 4/24/23 (a)		2,400,000		2,518,638
5.182% 4/24/28 (a)		1,520,000		1,629,698
Yara International ASA 3.148% 6/04/30 (a)		500,000		541,392
4.750% 6/01/28 (a)		3,932,000		4,662,592
				13,838,009
Computers — 0.7%
Apple, Inc. 2.650% 5/11/50		955,000		1,013,586
Dell International LLC/EMC Corp. 6.020% 6/15/26 (a)		3,164,000		3,859,907
Genpact Luxembourg Sarl 3.700% STEP 4/01/22		2,295,000		2,339,991
Leidos, Inc.  2.300% 2/15/31 (a)		1,575,000		1,603,663
4.375% 5/15/30 (a)		785,000		939,998
				9,757,145
Diversified Financial Services — 3.3%
AerCap Ireland Capital DAC/AerCap Global Aviation Trust 4.500% 9/15/23		1,840,000		1,994,970
6.500% 7/15/25		885,000		1,057,973
Aircastle Ltd. 4.400% 9/25/23		3,835,000		4,063,794
5.000% 4/01/23		1,950,000		2,078,514
Antares Holdings LP 6.000% 8/15/23 (a)		3,935,000		4,013,004
8.500% 5/18/25 (a)		1,185,000		1,277,421
Ares Finance Co. LLC 4.000% 10/08/24 (a)		2,380,000		2,556,282
Avolon Holdings Funding Ltd. 3.250% 2/15/27 (a)		1,740,000		1,775,354

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Brookfield Finance, Inc. 4.350% 4/15/30	$	4,185,000	$	5,011,807
4.850% 3/29/29		2,168,000		2,655,883
GE Capital International Funding Co. Unlimited Co.  4.418% 11/15/35		790,000		942,901
Global Aircraft Leasing Co. Ltd. 6.500% 9/15/24  (a)		1,787,531		1,595,371
Lazard Group LLC 3.625% 3/01/27		1,209,000		1,329,255
4.500% 9/19/28		2,055,000		2,438,941
LeasePlan Corp. NV  2.875% 10/24/24  (a)		1,930,000		2,039,350
Legg Mason, Inc.  5.625% 1/15/44		1,346,000		1,931,448
Park Aerospace Holdings Ltd.  4.500% 3/15/23  (a)		2,225,000		2,331,633
5.250% 8/15/22 (a)		6,015,000		6,312,802
				45,406,703
Electric — 1.1%
Appalachian Power Co. 4.500%  3/01/49		1,500,000		1,955,581
The Cleveland Electric Illuminating Co. 5.950% 12/15/36		589,000		719,772
CMS Energy Corp.  4.700% 3/31/43		655,000		842,559
4.875% 3/01/44		700,000		921,961
Duke Energy Progress, Inc.  6.125% 9/15/33		37,000		50,934
Entergy Arkansas LLC 2.650% 6/15/51		2,290,000		2,347,810
FirstEnergy Transmission LLC 4.550% 4/01/49  (a)		1,180,000		1,378,041
Infraestructura Energetica Nova SAB de CV 3.750% 1/14/28  (a)		1,505,000		1,604,706
ITC Holdings Corp. 2.950%  5/14/30  (a)		1,220,000		1,333,496
Nevada Power Co. 6.650% 4/01/36		1,000,000		1,527,026
Oncor Electric Delivery Co.  7.500% 9/01/38		130,000		216,501
Pacific Gas and Electric Co. 2.500% 2/01/31		1,035,000		1,038,779
PPL Capital Funding, Inc. 4.000% 9/15/47		1,050,000		1,223,142
				15,160,308
Electronics — 0.1%
Arrow Electronics, Inc. 5.125% 3/01/21		750,000		754,734
Foods — 0.3%
JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc. 5.500% 1/15/30  (a)		928,000		1,066,049
Mars, Inc.  3.950%  4/01/49  (a)		1,135,000	��	1,446,289

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Smithfield Foods, Inc.  3.000% 10/15/30 (a)	$	1,208,000	$	1,278,157
				3,790,495
Forest Products & Paper — 0.1%
Fibria Overseas Finance Ltd. 4.000% 1/14/25		1,225,000		1,309,231
Gas — 0.3%
CenterPoint Energy Resources Corp. 6.625% 11/01/37		1,500,000		2,147,946
NiSource, Inc. 4.800% 2/15/44		1,350,000		1,768,167
				3,916,113
Health Care – Services — 0.3%
Advocate Health & Hospitals Corp. 3.829% 8/15/28		960,000		1,105,780
City of Hope 4.378% 8/15/48		1,275,000		1,549,213
Humana, Inc. 4.800% 3/15/47		780,000		1,041,928
				3,696,921
Insurance — 4.8%
Allstate Corp. 3 mo. USD LIBOR + 2.938% 5.750% VRN 8/15/53		4,970,000		5,318,198
American International Group, Inc. 3.400% 6/30/30		840,000		962,516
4.500% 7/16/44		1,200,000		1,537,659
3 mo. USD LIBOR + 2.868% 5.750% VRN 4/01/48		3,920,000		4,481,030
AmTrust Financial Services, Inc. 6.125% 8/15/23		4,330,000		4,276,010
Arch Capital Group US, Inc. 5.144% 11/01/43		500,000		673,282
Athene Global Funding 2.500% 1/14/25 (a)		3,535,000		3,703,040
Athene Holding Ltd. 4.125% 1/12/28		5,407,000		6,025,519
6.150% 4/03/30		590,000		733,977
AXIS Specialty Finance LLC 3.900% 7/15/29		1,505,000		1,659,565
5 year CMT + 3.186% 4.900% VRN 1/15/40		1,670,000		1,747,273
AXIS Specialty Finance PLC 4.000% 12/06/27		2,760,000		3,077,397
Brighthouse Financial, Inc. 3.700% 6/22/27		1,600,000		1,740,038
4.700% 6/22/47		1,525,000		1,592,475
5.625% 5/15/30		1,190,000		1,469,032
CNO Financial Group, Inc. 5.250% 5/30/25		3,264,000		3,788,776
Enstar Group Ltd. 4.500% 3/10/22		1,815,000		1,884,020
4.950% 6/01/29		2,050,000		2,318,893
Equitable Holdings, Inc. 5.000% 4/20/48		1,250,000		1,646,440

MassMutual Premier Core Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Markel Corp.
3.350 % 9/17/29	$	715,000	$	803,908
New York Life Insurance Co.
3.750% 5/15/50 (a)		695,000		831,382
Prudential Financial, Inc.
5 year CMT + 3.035%  3.700%  VRN 10/01/50		480,000		507,734
3 mo. USD LIBOR + 3.920%  5.625% VRN 6/15/43		1,300,000		1,394,152
3 mo. USD LIBOR + 2.665%  5.700% VRN 9/15/48		3,380,000		3,902,261
3 mo. USD LIBOR + 4.175%  5.875% VRN 9/15/42		650,000		697,543
Reinsurance Group of America, Inc.
3.150% 6/15/30		1,590,000		1,738,533
Teachers Insurance & Annuity Association of America
4.270% 5/15/47 (a)		1,025,000		1,281,725
USF&G Capital I
8.500% 12/15/45 (a)		1,015,000		1,635,103
Voya Financial, Inc. 3 mo. USD LIBOR + 2.084%
4.700% VRN 1/23/48		1,010,000		1,049,390
Willis North America, Inc.
2.950% 9/15/29		1,200,000		1,312,941
XLIT Ltd.
4.450% 3/31/25		2,564,000		2,926,014
				66,715,826
Internet — 0.1%
Amazon.com, Inc.
4.050% 8/22/47		1,055,000		1,393,076
Investment Companies — 1.3%
Ares Capital Corp.
3.500% 2/10/23		3,465,000		3,650,122
4.200% 6/10/24		2,100,000		2,266,817
BlackRock TCP Capital Corp.
3.900% 8/23/24		4,215,000		4,404,008
4.125% 8/11/22		2,810,000		2,929,846
Sixth Street Specialty Lending, Inc.
3.875% 11/01/24		4,505,000		4,644,007
				17,894,800
Iron & Steel — 0.2%
Vale Overseas Ltd.
6.250% 8/10/26		1,550,000		1,922,000
6.875% 11/21/36		825,000		1,209,145
				3,131,145
Machinery – Diversified — 0.3%
CNH Industrial Capital LLC
1.950% 7/02/23		755,000		777,231
3.875% 10/15/21		2,870,000		2,937,389
				3,714,620
Media — 1.2%
Charter Communications Operating LLC/Charter Communications Operating Capital
6.484% 10/23/45		1,905,000		2,694,545
Comcast Corp.
3.400% 7/15/46		1,450,000		1,669,339

MassMutual Premier Core Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
3.450% 2/01/50	$	675,000	$	796,544
3.969% 11/01/47		660,000		827,587
4.750% 3/01/44		925,000		1,267,672
Discovery Communications LLC
4.000% 9/15/55 (a)		1,186,000		1,327,488
4.650% 5/15/50		705,000		881,775
Time Warner Cable, Inc.
6.750% 6/15/39		655,000		932,200
ViacomCBS, Inc.
4.200% 5/19/32		1,931,000		2,327,139
4.950% 1/15/31		1,324,000		1,661,790
The Walt Disney Co.
3.600% 1/13/51		1,990,000		2,408,893
				16,794,972
Metal Fabricate & Hardware — 0.2%
The Timken Co.
4.500% 12/15/28		2,730,000		3,057,352
Mining — 0.6%
Glencore Finance Canada Ltd.
5.550% STEP 10/25/42 (a)		857,000		1,051,008
Glencore Funding LLC
3.875% 10/27/27 (a)		950,000		1,070,555
4.625% 4/29/24 (a)		4,085,000		4,562,053
Teck Resources Ltd.
6.000% 8/15/40		1,075,000		1,346,917
				8,030,533
Miscellaneous - Manufacturing — 0.0%
General Electric Co.
6.875% 1/10/39		429,000		631,523
Oil & Gas — 2.4%
BP Capital Markets PLC 5 year CMT + 4.036%
4.375% VRN (b)		1,925,000		2,059,846
Cenovus Energy, Inc.
4.250% 4/15/27		1,475,000		1,610,734
6.750% 11/15/39		1,176,000		1,554,783
Devon Energy Corp.
5.850% 12/15/25		2,055,000		2,415,320
EQT Corp.
3.900% 10/01/27		5,620,000		5,583,189
7.875% STEP 2/01/25		2,200,000		2,505,250
Marathon Petroleum Corp.
4.500% 4/01/48		495,000		548,707
4.750% 9/15/44		625,000		717,947
6.500% 3/01/41		1,060,000		1,423,156
Occidental Petroleum Corp.
6.600% 3/15/46		1,228,000		1,246,021
Ovintiv Exploration, Inc.
5.375% 1/01/26		1,875,000		2,012,152
5.625% 7/01/24		1,200,000		1,285,361
5.750% 1/30/22		2,110,000		2,191,555
Ovintiv, Inc.
6.500% 2/01/38		530,000		591,828

MassMutual Premier Core Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Patterson-UTI Energy, Inc.
3.950% 2/01/28	$	2,060,000	$	1,901,665
Petroleos Mexicanos
5.350% 2/12/28		1,925,000		1,904,306
6.375% 1/23/45		640,000		586,560
6.500% 3/13/27		295,000		310,691
6.625% 6/15/38		202,000		194,324
Saudi Arabian Oil Co.
4.250% 4/16/39 (a)		2,580,000		3,025,275
				33,668,670
Oil & Gas Services — 0.4%
Halliburton Co.
5.000% 11/15/45		1,300,000		1,545,407
National Oilwell Varco, Inc.
3.600% 12/01/29		2,155,000		2,253,472
3.950% 12/01/42		1,778,000		1,808,741
				5,607,620
Packaging & Containers — 0.1%
WRKCo, Inc.
3.000% 6/15/33		890,000		977,813
Pharmaceuticals — 1.3%
AbbVie, Inc.
4.050% 11/21/39		1,345,000		1,627,752
4.700% 5/14/45		1,465,000		1,916,535
Bristol-Myers Squibb Co.
4.350% 11/15/47		1,150,000		1,548,909
Cigna Corp.
4.800% 7/15/46		1,105,000		1,456,484
CVS Health Corp.
4.300% 3/25/28		748,000		890,091
5.050% 3/25/48		370,000		501,453
6.125% 9/15/39		895,000		1,263,239
CVS Pass-Through Trust
5.926% 1/10/34 (a)		1,775,871		2,153,925
McKesson Corp.
4.883% 3/15/44		800,000		1,008,715
Takeda Pharmaceutical Co. Ltd.
3.375% 7/09/60		1,300,000		1,441,493
Utah Acquisition Sub, Inc.
5.250% 6/15/46		1,750,000		2,292,640
Viatris, Inc.
2.700% 6/22/30 (a)		1,650,000		1,750,857
				17,852,093
Pipelines — 2.1%
Energy Transfer Operating LP
4.200% 4/15/27		2,425,000		2,672,743
6.125% 12/15/45		1,385,000		1,636,096
3 mo. USD LIBOR + 4.028%  6.250%  VRN (b)		2,635,000		2,094,825
EnLink Midstream Partners LP
4.150% 6/01/25		2,972,000		2,897,700
4.850% 7/15/26		996,000		972,435
Enterprise Products Operating LLC

MassMutual Premier Core Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
3 mo. USD LIBOR + 3.033%  5.250%  VRN 8/16/77	$	2,550,000	$	2,585,365
3 mo. USD LIBOR + 2.570% 5.375%  VRN 2/15/78		1,120,000		1,131,751
EQM Midstream Partners LP
4.750% 7/15/23		2,870,000		3,017,748
MPLX LP
4.500% 4/15/38		1,115,000		1,275,353
3 mo. USD LIBOR + 4.652%  6.875%  VRN (b)		3,550,000		3,425,750
Plains All American Pipeline LP 3 mo. USD LIBOR + 4.110%
6.125% VRN (b)		2,590,000		2,104,375
Plains All American Pipeline LP/PAA Finance Corp.
3.800% 9/15/30		1,570,000		1,687,830
4.500% 12/15/26		589,000		659,746
4.700% 6/15/44		1,525,000		1,581,286
6.650% 1/15/37		475,000		579,835
Sunoco Logistics Partners Operations LP
5.300% 4/01/44		500,000		540,313
				28,863,151
Private Equity — 0.6%
Apollo Management Holdings LP 5 year CMT + 3.266%
4.950%  VRN 1/14/50 (a)		1,045,000		1,067,984
Carlyle Finance Subsidiary LLC
3.500% 9/19/29 (a)		1,345,000		1,478,161
Hercules Capital, Inc.
4.625% 10/23/22		3,220,000		3,273,385
KKR Group Finance Co. VI LLC
3.750% 7/01/29 (a)		1,480,000		1,722,133
KKR Group Finance Co. VIII LLC
3.500% 8/25/50 (a)		920,000		1,021,019
				8,562,682
Real Estate Investment Trusts (REITS) — 2.3%
Agree LP
2.900% 10/01/30		615,000		653,309
American Tower Trust #1
3.652% 3/15/48 (a)		1,810,000		1,989,657
Crown Castle International Corp.
5.200% 2/15/49		150,000		204,267
Highwoods Realty LP
4.125% 3/15/28		625,000		702,980
Host Hotels & Resorts LP
3.500% 9/15/30		2,756,000		2,903,565
SBA Tower Trust
1.884% 7/15/50 (a)		1,936,000		1,992,577
Service Properties Trust
4.500% 6/15/23		953,000		957,765
4.950% 10/01/29		1,445,000		1,448,612
Spirit Realty LP
3.200% 1/15/27		2,455,000		2,607,785
3.400% 1/15/30		490,000		531,417
4.000% 7/15/29		2,405,000		2,707,785
4.450% 9/15/26		298,000		336,213
STORE Capital Corp.
2.750% 11/18/30		565,000		574,593
4.625% 3/15/29		2,177,000		2,525,478
Tanger Properties LP
3.875% 12/01/23		1,777,000		1,845,693

MassMutual Premier Core Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
VEREIT Operating Partnership LP
2.850% 12/15/32	$	265,000	$	277,097
3.100% 12/15/29		3,615,000		3,900,214
3.400% 1/15/28		710,000		783,800
4.625% 11/01/25		2,525,000		2,906,293
WP Carey, Inc.
2.400% 2/01/31		590,000		612,744
4.250% 10/01/26		1,036,000		1,192,295
				31,654,139
Retail — 0.6%
Advance Auto Parts, Inc.
1.750% 10/01/27		405,000		411,316
AutoZone, Inc.
1.650% 1/15/31		1,285,000		1,274,495
El Puerto de Liverpool SAB de CV
3.950% 10/02/24 (a)		3,375,000		3,623,940
O'Reilly Automotive, Inc.
4.200% 4/01/30		1,205,000		1,451,582
Starbucks Corp.
2.550% 11/15/30		2,205,000		2,384,696
				9,146,029
Semiconductors — 0.3%
KLA Corp.
3.300% 3/01/50		2,240,000		2,527,727
Microchip Technology, Inc.
0.972% 2/15/24 (a)		2,210,000		2,215,410
				4,743,137
Software — 0.5%
Broadridge Financial Solutions, Inc.
2.900% 12/01/29		1,600,000		1,752,608
Microsoft Corp.
4.450% 11/03/45		2,560,000		3,633,083
Oracle Corp.
3.600% 4/01/50		1,215,000		1,415,576
				6,801,267
Telecommunications — 1.2%
AT&T, Inc.
1.650% 2/01/28		895,000		913,163
3.500% 9/15/53 (a)		2,083,000		2,086,057
3.550% 9/15/55 (a)		6,775,000		6,752,001
Crown Castle Towers LLC
4.241% 7/15/48 (a)		1,750,000		2,017,887
Qwest Corp
6.750% 12/01/21		908,000		949,904
Telefonica Emisiones SAU
4.665% 3/06/38		1,040,000		1,248,499
Verizon Communications, Inc.
2.875% 11/20/50		1,000,000		1,007,604
2.987% 10/30/56 (a)		1,414,000		1,423,351
				16,398,466

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Transportation — 0.3%
Autoridad del Canal de Panama
4.950%  7/29/35  (a)	$	1,340,000	$	1,691,763
CSX Corp.
4.750%  11/15/48		820,000		1,124,779
Norfolk Southern Corp.
4.050%  8/15/52		1,180,000		1,502,171
				4,318,713
TOTAL CORPORATE DEBT (Cost $469,982,432)				516,275,578
Municipal Obligations — 0.3%
JobsOhio Beverage System Series B, Revenue Bonds
4.532%  1/01/35		3,050,000		3,909,155
TOTAL MUNICIPAL OBLIGATIONS (Cost $3,248,766)				3,909,155
Non-U.S. Government Agency Obligations — 31.8%
Automobile Asset-Backed Securities — 1.0%
AmeriCredit Automobile Receivables Trust, Series 2020-3, Class D
1.490%  9/18/26		559,000		559,760
Avis Budget Rental Car Funding AESOP LLC, Series 2019-1A, Class C
4.530%  3/20/23  (a)		1,577,000		1,592,868
Carvana Auto Receivables Trust, Series 2019-4A, Class D
3.070%  7/15/25  (a)		2,109,000		2,168,968
Hertz Vehicle Financing II LP, Series 2019-3A, Class C
3.430%  12/26/25  (a)		2,971,400		2,934,618
OneMain Direct Auto Receivables Trust, Series 2019-1A, Class B
3.950%  11/14/28  (a)		2,383,000		2,601,367
Santander Drive Auto Receivables Trust, Series 2020-4, Class D
1.480%  1/15/27		650,000		650,804
Santander Revolving Auto Loan Trust
Series 2019-A, Class B, 2.800% 1/26/32  (a)		1,111,000		1,163,571
Series 2019-A, Class C, 3.000% 1/26/32  (a)		717,000		752,867
Series 2019-A, Class D, 3.450% 1/26/32  (a)		1,408,000		1,474,234
				13,899,057
Commercial Mortgage-Backed Securities — 5.9%
Aventura Mall Trust, Series 2018-AVM, Class C,
4.112% VRN 7/05/40  (a) (c)		4,140,000		3,834,096
BAMLL Commercial Mortgage Securities Trust, Series 2018-DSNY, Class C, 1 mo. USD LIBOR + 1.350%
1.509% FRN 9/15/34  (a)		760,000		735,414
BANK
Series 2020-BN30, Class MCDF, 2.918% VRN 12/10/53  (c)		3,165,000		3,058,231
Series 2019-BN17, Class B, 4.128% VRN 4/15/52  (c)		917,000		1,053,546
Series 2019-BN16, Class AS, 4.267% 2/15/52		822,500		968,454
Series 2019-BN16, Class B, 4.438% VRN 2/15/52  (c)		684,276		794,112
BBCMS Mortgage Trust
Series 2020-C7, Class AS, 2.444% 4/15/53		1,784,000		1,887,819
Series 2018-CHRS, Class D, 4.267% VRN 8/05/38  (a) (c)		1,220,000		942,703
Series 2018-CHRS, Class C, 4.267% VRN 8/05/38  (a) (c)		1,590,000		1,347,045
Series 2018-CHRS, Class B, 4.267% VRN 8/05/38  (a) (c)		2,200,000		2,007,734
Benchmark Mortgage Trust, Series 2019-B14, Class AS
3.352%  12/15/62		3,650,000		4,033,132

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
BHMS Mortgage Trust
Series 2018-ATLS, Class A, 1 mo. USD LIBOR + 1.250% 1.409% FRN 7/15/35  (a)	$	5,180,000	$	5,051,134
Series 2018-ATLS, Class B, 1 mo. USD LIBOR + 1.500% 1.659% FRN 7/15/35  (a)		4,800,000		4,608,118
BX Commercial Mortgage Trust
Series 2018-IND, Class E, 1 mo. USD LIBOR + 1.700% 1.859% FRN 11/15/35  (a)		2,142,000		2,136,039
Series 2019-XL, Class E, 1 mo. USD LIBOR + 1.800% 1.959% FRN 10/15/36  (a)		2,040,990		2,028,929
Series 2019-XL, Class F, 1 mo. USD LIBOR + 2.000% 2.159% FRN 10/15/36  (a)		2,481,464		2,448,201
CAMB Commercial Mortgage Trust, Series 2019-LIFE, Class D, 1 mo. USD LIBOR + 1.750%
1.909% FRN 12/15/37  (a)		1,104,426		1,104,515
Century Plaza Towers
Series 2019-CPT, Class E, 2.997% VRN 11/13/39  (a) (c)		1,961,000		1,886,730
Series 2019-CPT, Class D, 2.997% VRN 11/13/39  (a) (c)		1,256,000		1,255,544
Citigroup Commercial Mortgage Trust, Series 2019-GC41, Class C
3.502%  8/10/56		1,259,000		1,271,937
Cold Storage Trust, Series 2020-ICE5, Class D, 1 mo. USD LIBOR + 2.100%
2.259% FRN 11/15/37  (a)		4,500,000		4,501,400
Commercial Mortgage Pass-Through Certificates
Series 2020-CX, Class B, 2.446% 11/10/46  (a)		1,395,000		1,450,180
Series 2015-CR23, Class B, 4.183% VRN 5/10/48  (c)		1,200,000		1,305,778
Series 2015-CR23, Class C, 4.291% VRN 5/10/48  (c)		1,050,000		1,098,504
Credit Suisse Mortgage Capital Certificates, Series 2019-ICE4, Class E, 1 mo. USD LIBOR + 2.150%
2.309% FRN 5/15/36  (a)		750,000		738,761
DBUBS Mortgage Trust, Series 2011-LC1A, Class B,
5.471% VRN 11/10/46  (a) (c)		860,000		859,170
GS Mortgage Securities Trust
Series 2019-GC39, Class C, 4.005% VRN 5/10/52  (c)		1,357,000		1,391,094
Series 2012-GC6, Class AS, 4.948% 1/10/45  (a)		800,000		820,136
Jackson Park Trust, Series 2019-LIC, Class C,
3.131% VRN 10/14/39  (a) (c)		2,900,000		2,885,809
JPMBB Commercial Mortgage Securities Trust, Series 2015-C27, Class B
3.898%  2/15/48		2,800,000		2,992,351
JPMDB Commercial Mortgage Securities Trust, Series 2017-C7, Class C,
4.179% VRN 10/15/50  (c)		2,900,000		3,152,881
KNDL Mortgage Trust, Series 2019-KNSQ, Class E, 1 mo. USD LIBOR + 1.800%
1.959% FRN 5/15/36  (a)		1,730,000		1,721,518
Manhattan West Mortgage Trust, Series 2020-1MW, Class B,
2.335% VRN 9/10/39  (a) (c)		2,799,000		2,924,548
MFT Trust
Series 2020-ABC, Class A, 3.358% 2/10/42  (a)		1,185,000		1,246,583
Series 2020-ABC, Class B, 3.477% VRN 2/10/42  (a) (c)		1,278,000		1,325,746
MKT Mortgage Trust
Series 2020-525M, Class D, 2.941% VRN 2/12/40  (a) (c)		595,000		593,541
Series 2020-525M, Class E, 2.941% VRN 2/12/40  (a) (c)		1,220,000		1,170,151
Morgan Stanley Capital I Trust
Series 2019-L2, Class AS, 4.272% 3/15/52		2,450,000		2,828,939
Series 2018-H3, Class B, 4.620% VRN 7/15/51  (c)		740,000		854,709
Series 2011-C2, Class B, 5.200% VRN 6/15/44  (a) (c)		825,000		831,960
Wells Fargo Commercial Mortgage Trust
Series 2019-C49, Class AS, 4.244% 3/15/52		1,492,000		1,734,309
Series 2018-C45, Class AS, 4.405% VRN 6/15/51  (c)		1,400,000		1,632,588

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2018-C45, Class B, 4.556% 6/16/51	$	390,000	$	453,344
				80,967,433
Other Asset-Backed Securities — 15.4%
321 Henderson Receivables LLC, Series 2015-1A, Class A
3.260%  9/15/72  (a)		2,741,725		2,997,362
522 Funding CLO Ltd., Series 2018-2A, Class C, 3 mo. USD LIBOR + 2.250%
2.468% FRN 10/20/31  (a)		1,400,000		1,388,562
AASET Trust
Series 2020-1A, Class A, 3.351% 1/16/40  (a)		1,895,071		1,783,847
Series 2019-1, Class A, 3.844% 5/15/39  (a)		2,398,335		2,264,969
Series 2018-2A, Class A, 4.454% 11/18/38  (a)		1,140,992		1,077,918
Adams Outdoor Advertising LP, Series 2018-1, Class A
4.810%  11/15/48  (a)		2,298,161		2,423,302
AGL CLO 7 Ltd., Series 2020-7A, Class A1, 3 mo. USD LIBOR + 1.800%
2.050% FRN 7/15/31  (a)		500,000		501,731
Anchorage Capital CLO 9 Ltd., Series 2016-9A, Class CR, 3 mo. USD LIBOR + 2.850%
3.087% FRN 7/15/32  (a)		1,000,000		1,000,206
Apidos CLO XXV, Series 2016-25A, Class A2R, 3 mo. USD LIBOR + 1.700%
1.918% FRN 10/20/31  (a)		2,610,000		2,599,101
Atlas Senior Loan Fund VII Ltd., Series 2016-7A, Class A1R, 3 mo. USD LIBOR + 1.280%
1.513% FRN 11/27/31  (a)		2,384,880		2,377,031
Avery Point VII CLO Ltd., Series 2015-7A, Class DR, 3 mo. USD LIBOR + 3.600%
3.837% FRN 1/15/28  (a)		1,000,000		995,015
Ballyrock CLO Ltd., Series 2019-2A, Class C, 3 mo. USD LIBOR + 4.100%
4.324% FRN 11/20/30  (a)		800,000		800,858
Benefit Street Partners CLO V-B Ltd., Series 2018-5BA, Class A1A, 3 mo. USD LIBOR + 1.090%
1.308% FRN 4/20/31  (a)		1,920,000		1,910,310
Benefit Street Partners CLO X Ltd., Series 2016-10A, Class CR, 3 mo. USD LIBOR + 3.500%
3.737% FRN 1/15/29  (a)		700,000		690,204
Benefit Street Partners CLO XVIII Ltd., Series 2019-18A, Class B, 3 mo. USD LIBOR + 1.950%
2.187% FRN 10/15/32  (a)		750,000		750,887
BlueMountain CLO XXV Ltd., Series 2019-25A, Class B, 3 mo. USD LIBOR + 1.800%
2.037% FRN 7/15/32  (a)		2,750,000		2,751,922
BRE Grand Islander Timeshare Issuer LLC, Series 2017-1A, Class A
2.940%  5/25/29  (a)		445,587		447,456
Business Jet Securities LLC, Series 2020-1A, Class A
2.981%  11/15/35  (a)		975,644		988,800
Canyon Capital CLO Ltd.
Series 2019-2A, Class A, 3 mo. USD LIBOR + 1.370% 1.607% FRN 10/15/32  (a)		600,000		600,618
Series 2019-2A, Class C, 3 mo. USD LIBOR + 2.750% 2.987% FRN 10/15/32  (a)		400,000		400,438
Capital Automotive REIT
Series 2020-1A, Class A3, 3.250% 2/15/50  (a)		578,386		585,041
Series 2014-1A, Class A, 3.660% 10/15/44  (a)		1,016,006		1,015,469
Series 2020-1A, Class A6, 3.810% 2/15/50  (a)		492,795		504,523
Series 2017-1A, Class A2, 4.180% 4/15/47  (a)		882,632		884,664
Carlyle Global Market Strategies CLO Ltd.

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2018-4A, Class A2, 3 mo. USD LIBOR + 1.800% 2.018% FRN 1/20/31  (a)	$	1,080,000	$	1,080,067
Series 2015-3A, Class CR, 3 mo. USD LIBOR + 2.850% 3.072% FRN 7/28/28  (a)		310,000		300,837
Castlelake Aircraft Securitization Trust, Series 2019-1A, Class A
3.967%  4/15/39  (a)		2,803,986		2,666,573
Castlelake Aircraft Structured Trust, Series 2018-1, Class A
4.125%  6/15/43  (a)		2,777,245		2,639,782
CBAM Ltd., Series 2018-6A, Class B1R, 3 mo. USD LIBOR + 2.100%
2.337% FRN 1/15/31  (a)		1,200,000		1,200,220
Cedar Funding IX CLO Ltd., Series 2018-9A, Class A1, 3 mo. USD LIBOR + .980%
1.198% FRN 4/20/31  (a)		1,000,000		996,583
CF Hippolyta LLC
Series 2020-1, Class A1, 1.690% 7/15/60  (a)		1,507,919		1,535,989
Series 2020-1, Class B1, 1 mo. USD LIBOR + 1.850%, 2.280% FRN 7/15/60  (a)		670,928		681,307
CIFC Funding Ltd.
Series 2017-5A, Class A1, 3 mo. USD LIBOR + 1.180% 1.398% FRN 11/16/30  (a)		2,100,000		2,099,299
Series 2020-1A, Class A1, 3 mo. USD LIBOR + 1.700% 1.937% FRN 7/15/32  (a)		800,000		802,511
Clear Creek CLO Ltd., Series 2015-1A, Class AR, 3 mo. USD LIBOR + 1.200%
1.418% FRN 10/20/30  (a)		2,120,000		2,117,908
CLI Funding VI LLC, Series 2020-3A, Class A
2.070%  10/18/45  (a)		2,042,250		2,034,357
Crestline Denali CLO XIV Ltd., Series 2016-1A, Class A1R, 3 mo. USD LIBOR + 1.280%
1.489% FRN 10/23/31  (a)		1,298,592		1,298,623
DB Master Finance LLC, Series 2019-1A, Class A23
4.352%  5/20/49  (a)		1,912,788		2,065,172
Domino’s Pizza Master Issuer LLC
Series 2019-1A, Class A2, 3.668% 10/25/49  (a)		1,376,100		1,457,571
Series 2018-1A, Class A2I, 4.116% 7/25/48  (a)		1,476,025		1,546,559
Series 2017-1A, Class A23, 4.118% 7/25/47  (a)		649,900		695,401
Series 2015-1A, Class A2II, 4.474% 10/25/45  (a)		3,590,625		3,796,786
Dryden 72 CLO Ltd., Series 2019-72A, Class B, 3 mo. USD LIBOR + 1.900%
2.121% FRN 5/15/32  (a)		1,700,000		1,700,695
Eaton Vance CLO Ltd.
Series 2020-1A, Class C, 3 mo. USD LIBOR + 2.800% 0.000% FRN 10/15/30  (a)		400,000		401,100
Series 2018-1A, Class B, 3 mo. USD LIBOR + 1.750% 1.987% FRN 10/15/30  (a)		1,700,000		1,700,007
Elmwood CLO II Ltd., Series 2019-2A, Class A, 3 mo. USD LIBOR + 1.450%
1.668% FRN 4/20/31  (a)		3,500,000		3,503,080
Elmwood CLO III Ltd., Series 2019-3A, Class B, 3 mo. USD LIBOR + 1.950%
2.187% FRN 10/15/32  (a)		1,300,000		1,302,982
Elmwood CLO IV Ltd., Series 2020-1A, Class A, 3 mo. USD LIBOR + 1.240%
1.477% FRN 4/15/33  (a)		1,000,000		1,001,161
FCI Funding LLC, Series 2019-1A, Class A  3.630%  2/18/31  (a)		271,701		275,918
Flatiron CLO Ltd.
Series 2019-1A, Class B, 3 mo. USD LIBOR + 1.900% 2.121% FRN 11/16/32  (a)		1,300,000		1,302,049

 MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2019-1A, Class C, 3 mo. USD LIBOR + 2.700% 2.921% FRN 11/16/32  (a)	$	250,000	$	250,610
Global Container Assets Ltd., Series 2015-1A, Class A2  3.450%  2/05/30  (a)		557,685		557,865
Global SC Finance SRL, Series 2014-1A, Class A1 3.190%  7/17/29  (a)		179,167		178,270
Goldentree Loan Management US CLO Ltd., Series 2019-5A, Class C, 3 mo. USD LIBOR + 2.700% 2.918% FRN 10/20/32  (a)		500,000		500,999
Goodgreen Trust
Series 2019-2A, Class A, 2.760% 10/15/54  (a)		3,612,352		3,733,692
Series 2016-1A, Class A, 3.230% 10/15/52  (a)		1,453,806		1,497,698
Series 2017-1A, Class A, 3.740% 10/15/52  (a)		688,690		726,073
Series 2019-1A, Class A, 3.860% 10/15/54  (a)		1,462,496		1,545,783
Series 2018-1A, Class A, 3.930% VRN 10/15/53  (a) (c)		1,814,612		1,934,423
Helios Issuer LLC, Series 2017-1A, Class A 4.940%  9/20/49  (a)		1,436,407		1,501,949
Hero Funding Trust
Series 2016-3A, Class A1, 3.080% 9/20/42  (a)		763,311		783,456
Series 2017-3A, Class A1, 3.190% 9/20/48  (a)		787,785		811,434
Series 2017-2A, Class A1, 3.280% 9/20/48  (a)		241,039		249,069
Series 2016-4A, Class A1, 3.570% 9/20/47  (a)		772,858		810,268
Series 2017-2A, Class A2, 4.070% 9/20/48  (a)		193,861		202,151
Series 2018-1A, Class A2, 4.670% 9/20/48  (a)		1,409,216		1,508,776
Highbridge Loan Management Ltd.
Series 12A-18, Class B, 3 mo. USD LIBOR + 1.850% 2.068% FRN 7/18/31  (a)		1,700,000		1,661,923
Series 13A-18, Class C, 3 mo. USD LIBOR + 2.150% 2.387% FRN 10/15/30  (a)		1,000,000		988,075
Horizon Aircraft Finance I Ltd.
Series 2019-1, Class A, 3.721% 7/15/39  (a)		1,532,936		1,478,839
Series 2018-1, Class A, 4.458% 12/15/38  (a)		1,118,419		1,080,308
Horizon Aircraft Finance III Ltd., Series 2019-2, Class A  3.425%  11/15/39  (a)		3,595,569		3,474,267
HPS Loan Management Ltd., Series 15A-19, Class A1, 3 mo. USD LIBOR + 1.320% 1.536% FRN 7/22/32  (a)		800,000		800,446
ICG US CLO Ltd., Series 2019-1A, Class A1A, 3 mo. USD LIBOR + 1.380% 1.595% FRN 10/26/32  (a)		900,000		901,184
J.G. Wentworth LLC, Series 2018-2A, Class A 3.960%  10/15/75  (a)		1,531,006		1,758,079
J.G. Wentworth XXXV LLC, Series 2015-2A, Class A 3.870%  3/15/58  (a)		628,738		722,383
KKR Financial CLO Ltd.
Series 24, Class A1, 3 mo. USD LIBOR + 1.360% 1.578% FRN 4/20/32  (a)		1,800,000		1,800,542
Series 25, Class B1, 3 mo. USD LIBOR + 2.000% 2.237% FRN 4/15/32  (a)		1,500,000		1,500,646
Labrador Aviation Finance Ltd., Series 2016-1A, Class A1  4.300%  1/15/42  (a)		2,075,091		1,961,261
Lunar Aircraft Ltd., Series 2020-1A, Class A 3.376%  2/15/45  (a)		1,184,513		1,118,705
MACH 1 Cayman Ltd., Series 2019-1, Class A 3.474%  10/15/39  (a)		2,439,466		2,356,633
Madison Park Funding Ltd.
Series 2018-28A, Class B, 3 mo. USD LIBOR + 1.600% 1.837% FRN 7/15/30  (a)		2,090,000		2,078,206
Series 2018-29A, Class C, 3 mo. USD LIBOR + 2.200% 2.418% FRN 10/18/30  (a)		680,000		673,993

 MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Magnetite XV Ltd., Series 2015-15A, Class CR, 3 mo. USD LIBOR + 1.800% 2.015% FRN 7/25/31  (a)	$	2,830,000	$	2,783,916
Mariner Finance Issuance Trust, Series 2018-AA, Class A 4.200%  11/20/30  (a)		1,923,434		1,942,068
Mosaic Solar Loans LLC
Series 2017-2A, Class A, 3.820% 6/22/43  (a)		570,306		613,706
Series 2018-1A, Class A, 4.010% 6/22/43  (a)		250,839		270,747
Series 2017-1A, Class A, 4.450% 6/20/42  (a)		266,982		287,120
MP CLO III Ltd., Series 2013-1A, Class AR, 3 mo. USD LIBOR + 1.250%  1.468% FRN 10/20/30  (a)		1,850,000		1,843,257
MVW Owner Trust, Series 2017-1A, Class A  2.420%  12/20/34  (a)		180,637		184,011
New Residential Advance Receivables Trust, Series 2020-T1, Class ET1  5.467%  8/15/53  (a)		2,495,000		2,503,863
NP SPE LLC, Series 2017-1A, Class A2 4.219%  10/21/47  (a)		2,190,000		2,324,964
Oak Street Investment Grade Net Lease Fund, Series 2020-1A, Class A5 3.390%  11/20/50  (a)		1,600,000		1,597,854
Octagon Investment Partners 39 Ltd., Series 2018-3A, Class C, 3 mo. USD LIBOR + 2.200% 2.418% FRN 10/20/30  (a)		1,180,000		1,180,005
OHA Credit Funding Ltd.
Series 2019-4A, Class A1, 3 mo. USD LIBOR + 1.330% 1.546% FRN 10/22/32  (a)		1,250,000		1,251,521
Series 2019-4A, Class C, 3 mo. USD LIBOR + 2.650% 2.866% FRN 10/22/32  (a)		1,000,000		1,003,146
OneMain Financial Issuance Trust
Series 2020-2A, Class B, 2.210% 9/14/35  (a)		496,000		502,796
Series 2019-2A, Class A, 3.140% 10/14/36  (a)		10,200,000		11,010,403
Oxford Finance Funding Trust, Series 2020-1A, Class A2  3.101%  2/15/28  (a)		1,894,000		1,936,695
Pioneer Aircraft Finance Ltd., Series 2019-1, Class A 3.967%  6/15/44  (a)		1,787,347		1,697,932
Planet Fitness Master Issuer LLC, Series 2019-1A, Class A2 3.858%  12/05/49  (a)		2,955,150		2,862,336
PNMAC GMSR Issuer Trust, Series 2018-GT1, Class A, 1 mo. USD LIBOR + 2.850% 2.998% FRN 2/25/23  (a)		1,180,000		1,160,052
Regatta XIV Funding Ltd., Series 2018-3A, Class B, 3 mo. USD LIBOR + 1.850% 2.065% FRN 10/25/31  (a)		1,030,000		1,030,030
RR 6 Ltd., Series 2019-6A, Class A1A, 3 mo. USD LIBOR + 1.250% 1.487% FRN 4/15/30  (a)		750,000		750,014
Sierra Receivables Funding LLC
Series 2020-2A, Class B, 2.320% 7/20/37  (a)		1,140,315		1,152,525
Series 2019-1A, Class D, 4.750% 1/20/36  (a)		1,523,560		1,533,899
Series 2018-3A, Class D, 5.200% 9/20/35  (a)		889,297		889,035
Stack Infrastructure Issuer LLC, Series 2020-1A, Class A2 1.893%  8/25/45  (a)		1,135,000		1,146,975
Steele Creek CLO Ltd., Series 2018-2A, Class C, 3 mo. USD LIBOR + 2.300% 2.520% FRN 8/18/31  (a)		1,660,000		1,618,493
Store Master Funding I-VII
Series 2019-1, Class A2, 3.650% 11/20/49  (a)		3,585,233		3,656,229
Series 2018-1A, Class A2, 4.290% 10/20/48  (a)		1,454,656		1,520,987
Structured Asset Securities Corp. Mortgage Loan Trust, Series 2006-GEL1, Class M2, 1 mo. USD LIBOR + 1.200% 1.348% FRN 11/25/35  (a)		1,114,215		1,063,103

 MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Structured Receivables Finance LLC, Series 2010-B, Class A  3.730%  8/15/36  (a)	$	192,048	$	201,370
Sunnova Helios II Issuer LLC, Series 2018-1A, Class A  4.870%  7/20/48  (a)		622,434		666,303
SuttonPark Structured Settlements LLC, Series 2017-1A, Class A 4.190%  1/15/71  (a)		1,834,831		2,120,390
Taco Bell Funding LLC, Series 2018-1A, Class A2II 4.940%  11/25/48  (a)		1,411,200		1,551,701
TAL Advantage VII LLC, Series 2020-1A, Class A 2.050%  9/20/45  (a)		5,355,625		5,360,447
Textainer Marine Containers VII Ltd., Series 2019-1A, Class A 3.960%  4/20/44  (a)		468,000		473,231
THL Credit Wind River CLO Ltd., Series 2018-3A, Class B, 3 mo. USD LIBOR + 1.700% 1.918% FRN 1/20/31  (a)		2,440,000		2,435,588
TICP CLO XIV Ltd., Series 2019-14A, Class A2, 3 mo. USD LIBOR + 1.900%  2.118% FRN 10/20/32  (a)		250,000		250,261
Tif Funding II LLC, Series 2020-1A, Class A 2.090%  8/20/45  (a)		820,950		827,000
Trinity Rail Leasing LP
Series 2019-2A, Class A2, 3.100% 10/18/49  (a)		4,127,000		4,306,208
Series 2019-1A, Class A, 3.820% 4/17/49  (a)		4,238,694		4,432,991
Series 2018-1A, Class A2, 4.620% 6/17/48  (a)		2,370,000		2,493,065
Trip Rail Master Funding LLC, Series 2017-1A, Class A1  2.709%  8/15/47  (a)		123,963		124,120
Triton Container Finance VIII LLC, Series 2020-1A, Class A 2.110%  9/20/45  (a)		3,963,932		4,002,337
Vantage Data Centers LLC, Series 2020-2A, Class A2 1.992%  9/15/45  (a)		1,702,000		1,712,699
Vivint Solar Financing V LLC, Series 2018-1A, Class B 7.370%  4/30/48  (a)		2,360,466		2,509,588
Voya CLO Ltd.
Series 2015-3A, Class A3R, 3 mo. USD LIBOR + 1.700% 1.918% FRN 10/20/31  (a)		1,500,000		1,493,814
Series 2019-3A, Class B1, 3 mo. USD LIBOR + 1.850% 2.068% FRN 10/17/32  (a)		1,500,000		1,501,072
WAVE LLC
Series 2019-1A, Class A, 3.597% 9/15/44  (a)		4,791,086		4,672,064
Series 2017-1A, Class C, 6.656% 11/15/42  (a)		1,796,357		1,104,299
WAVE Trust, Series 2017-1A, Class A 3.844%  11/15/42  (a)		3,000,460		2,911,431
Wendy’s Funding LLC, Series 2015-1A, Class A23 4.497%  6/15/45  (a)		3,032,000		3,013,209
Westgate Resorts LLC, Series 2017-1A, Class A  3.050%  12/20/30  (a)		382,247		386,377
Willis Engine Structured Trust IV, Series 2018-A, Class A,  4.750% STEP 9/15/43  (a)		1,146,408		989,383
				213,947,407
Student Loans Asset-Backed Securities — 9.1%
College Avenue Student Loans LLC
Series 2019-A, Class B, 3.810% 12/28/48  (a)		2,630,000		2,703,128
Series 2019-A, Class C, 4.460% 12/28/48  (a)		1,505,000		1,524,067
College Loan Corp. Trust I, Series 2007-1, Class B2, 28 day ARS  0.000% FRN 1/25/47		875,000		697,791
ECMC Group Student Loan Trust

 MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2018-2A, Class A, 1 mo. USD LIBOR + .800% 0.948% FRN 9/25/68  (a)	$	4,533,116	$	4,496,394
Series 2017-1A, Class A, 1 mo. USD LIBOR + 1.200% 1.348% FRN 12/27/66  (a)		1,997,983		2,006,634
Series 2016-1A, Class A, 1 mo. USD LIBOR + 1.350% 1.498% FRN 7/26/66  (a)		2,793,250		2,832,927
EdLinc Student Loan Funding, Series 2017-A, Class A, PRIME - 1.150% 3.600% FRN 12/01/47  (a)		1,617,120		1,599,119
Education Loan Asset-Backed Trust I
Series 2003-1, Class A2, 28 day ARS 0.000% FRN 2/01/43  (a)		1,300,000		1,199,129
Series 2003-2, Class 2A1, 0.000% FRN 8/01/43  (a) (c)		1,950,000		1,801,328
Series 2013-1, Class B1, 1 mo. USD LIBOR + 1.000% 1.148% FRN 11/25/33  (a)		1,067,667		1,041,907
Higher Education Funding I
Series 2004-1, Class B2, 28 day ARS 0.000% FRN 1/01/44  (a)		600,000		524,599
Series 2004-1, Class B1, 28 day ARS 0.000% FRN 1/01/44  (a)		600,000		533,503
Laurel Road Prime Student Loan Trust
Series 2017-B, Class BFX, 3.020% 8/25/42  (a)		538,731		542,573
Series 2018-B, Class BFX, 3.720% 5/26/43  (a)		436,918		444,236
Navient Private Education Loan Trust
Series 2018-BA, Class A2B, 1 mo. USD LIBOR + .720% 0.879% FRN 12/15/59  (a)		709,189		706,521
Series 2020-IA, Class B, 2.950% 4/15/69  (a)		3,080,000		3,068,458
Navient Private Education Refi Loan Trust
Series 2020-HA, Class B, 2.780% 1/15/69  (a)		2,425,000		2,435,528
Series 2019-CA, Class B, 3.670% 2/15/68  (a)		1,512,000		1,542,544
Series 2019-A, Class B, 3.900% 1/15/43  (a)		1,500,000		1,550,610
Series 2018-CA, Class B, 4.220% 6/16/42  (a)		1,480,000		1,546,339
Navient Student Loan Trust
Series 2016-1A, Class A, 1 mo. USD LIBOR + .700% 0.848% FRN 2/25/70  (a)		2,554,612		2,565,844
Series 2018-2A, Class A3, 1 mo. USD LIBOR + .750% 0.898% FRN 3/25/67  (a)		3,320,000		3,265,105
Series 2018-3A, Class A3, 1 mo. USD LIBOR + .800% 0.948% FRN 3/25/67  (a)		4,650,000		4,645,660
Series 2019-1A, Class A2, 1 mo. USD LIBOR + .900% 1.048% FRN 12/27/67  (a)		3,100,000		3,092,134
Series 2019-2A, Class A2, 1 mo. USD LIBOR + 1.000% 1.148% FRN 2/27/68  (a)		1,548,000		1,561,288
Series 2016-7A, Class A, 1 mo. USD LIBOR + 1.150% 1.298% FRN 3/25/66  (a)		3,157,147		3,194,554
Series 2016-5A, Class A, 1 mo. USD LIBOR + 1.250% 1.398% FRN 6/25/65  (a)		2,314,297		2,335,150
Series 2016-6A, Class A3, 1 mo. USD LIBOR + 1.300% 1.448% FRN 3/25/66  (a)		6,800,000		6,850,855
Series 2015-3, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 10/25/58		1,200,000		1,145,810
Series 2019-BA, Class B, 4.040% 12/15/59  (a)		3,700,000		3,828,469
Series 2018-EA, Class B, 4.440% 12/15/59  (a)		730,000		762,030
Nelnet Private Education Loan Trust, Series 2016-A, Class A1B 3.600%  12/26/40  (a)		290,403		291,785
Nelnet Student Loan Trust
Series 2018-3A, Class A3, 1 mo. USD LIBOR + .750% 0.898% FRN 9/27/66  (a)		4,500,000		4,497,204
Series 2014-3A, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 10/25/50  (a)		975,000		914,896
Series 2014-5A, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 5/26/54  (a)		1,300,000		1,238,621

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2015-2A, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 5/26/54 (a)	$	1,130,000	$	1,069,401
Series 2015-3A, Class B, 1 mo. USD LIBOR + 1.500% 1.650% FRN 6/25/54 (a)		1,100,000		1,063,808
Series 2019-4A, Class B, 1 mo. USD LIBOR + 1.650% 1.798% FRN 9/26/67 (a)		3,800,000		3,617,663
Series 2019-5, Class B, 3.450% 10/25/67 (a)		2,850,000		2,761,721
SLC Student Loan Trust
Series 2007-1, Class A5, 3 mo. USD LIBOR + .090% 0.311% FRN 2/15/68		8,400,000		7,863,361
Series 2005-1, Class B, 3 mo. USD LIBOR + .200% 0.421% FRN 2/15/45		1,488,887		1,339,994
SLM Student Loan Trust
Series 2006-2, Class R, 0.000% 1/25/41		9,078		4,992,900
Series 2006-5, Class B, 3 mo. USD LIBOR + .210% 0.425% FRN 10/25/40		1,747,201		1,561,918
Series 2005-8, Class B, 3 mo. USD LIBOR + .310% 0.525% FRN 1/25/55		1,282,633		1,187,142
Series 2003-14, Class A7, 3 mo. USD LIBOR + .600% 0.815% FRN 10/25/65 (a)		7,420,000		7,355,671
SMB Private Education Loan Trust
Series 2020-BA, Class B, 2.760% 7/15/53 (a)		3,431,000		3,316,097
Series 2017-A, Class B, 3.500% 6/17/41 (a)		1,800,000		1,813,364
SoFi Alternative Trust, Series 2019-C, Class PT,
4.974% VRN 1/25/45 (a) (c)		5,553,449		5,990,533
SoFi Professional Loan Program LLC
Series 2017-D, Class R1, 0.000% 9/25/40 (a)		4,647,800		1,345,352
Series 2018-A, Class R1, 0.000% 2/25/42 (a)		3,470,600		1,283,685
Series 2018-B, Class R1, 0.000% 8/26/47 (a)		3,139,900		1,164,646
Series 2018-D, Class R1, 0.000% 2/25/48 (a)		5,678,800		1,255,583
Series 2019-A, Class R1, 0.000% 6/15/48 (a)		8,126,500		1,750,448
South Carolina Student Loan Corp., Series 2014-1, Class B, 1 mo. USD LIBOR + 1.500%
1.655% FRN 8/01/35		3,025,000		2,906,526
				126,626,553
Whole Loan Collateral Collateralized Mortgage Obligations — 0.4%
Bank of America Mortgage Securities, Series 2004-G, Class 2A7,
3.076% VRN 8/25/34 (c)		75,920		74,415
Citigroup Mortgage Loan Trust, Series 2019-IMC1, Class M1,
3.170% VRN 7/25/49 (a) (c)		1,188,500		1,225,683
JP Morgan Mortgage Trust, Series 2017-1, Class A11,
3.500% VRN 1/25/47 (a) (c)		1,479,504		1,511,964
PSMC Trust, Series 2018-2, Class A1,
3.500% VRN 6/25/48 (a) (c)		1,185,224		1,208,820
Sequoia Mortgage Trust, Series 2018-CH2, Class A3,
4.000% VRN 6/25/48 (a) (c)		1,266,847		1,304,999
Wells Fargo Mortgage Backed Securities Trust, Series 2019-1, Class A1,
4.000% VRN 11/25/48 (a) (c)		528,464		541,750
				5,867,631
TOTAL NON-U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $440,572,808)				441,308,081
Sovereign Debt Obligations — 0.7%
Colombia Government International Bond
6.125% 1/18/41		2,980,000		3,993,200
Mexico Government International Bond
4.750% 3/08/44		4,328,000		5,139,543

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
6.750% 9/27/34	$	950,000	$	1,338,322
				10,471,065
TOTAL SOVEREIGN DEBT OBLIGATIONS (Cost $8,551,708)				10,471,065
U.S. Government Agency Obligations and Instrumentalities — 21.0%
Collateralized Mortgage Obligations — 0.0%
Federal Home Loan Mortgage Corp.     Series 2178, Class PB  7.000% 8/15/29		122,252		138,763
Pass-Through Securities — 20.6%
Federal Home Loan Mortgage Corp.
Pool #RA4245 2.000% 12/01/50		5,400,000		5,627,441
Pool #RA4255 2.000% 1/01/51		11,350,000		11,856,422
Pool #RA2483 3.500% 6/01/50		12,844,285		13,680,867
Pool #Z40047 4.000% 10/01/41		151,868		168,451
Federal National Mortgage Association
Pool #775539 12 mo. USD LIBOR + 1.641% 2.516% FRN 5/01/34		48,806		50,739
Pool #MA3029 3.000% 6/01/32		3,812,008		4,025,055
Pool #MA3090 3.000% 8/01/32		1,333,010		1,407,509
Pool #AS1304 3.500% 12/01/28		979,821		1,050,055
Pool #MA1356 3.500% 2/01/43		6,865,779		7,491,046
Pool #CA6096 3.500% 6/01/50		14,585,433		15,704,064
Pool #FM4017 3.500% 8/01/50		1,141,885		1,207,695
Pool #CA1909 4.500% 6/01/48		5,357,321		5,823,782
Pool #AD6437 5.000% 6/01/40		374,412		431,718
Pool #AD6996 5.000% 7/01/40		2,385,207		2,750,279
Pool #AL8173 5.000% 2/01/44		974,806		1,121,874
Government National Mortgage Association
Pool #404246 6.500% 8/15/28		165		186
Pool #781038 6.500% 5/15/29		33,558		37,968
Pool #781468 6.500% 7/15/32		2,279		2,647
Pool #781496 6.500% 9/15/32		11,100		12,833
Pool #345964 7.000% 11/15/23		457		483
Pool #380866 7.000% 3/15/24		377		402
Pool #781124 7.000% 12/15/29		4,217		4,813
Pool #781319 7.000% 7/15/31		78,690		91,231
Pool #581417 7.000% 7/15/32		10,819		12,314
Pool #565982 7.000% 7/15/32		12,606		14,799
Pool #357262 7.500% 9/15/23		550		581
Pool #441009 8.000% 11/15/26		604		678
Pool #522777 8.000% 12/15/29		4,188		4,800
Pool #523043 8.000% 3/15/30		225		260
Pool #529134 8.000% 3/15/30		1,413		1,658
Pool #477036 8.000% 4/15/30		567		666
Pool #503157 8.000% 4/15/30		12,224		14,360
Pool #528714 8.000% 4/15/30		1,109		1,304
Pool #544640 8.000% 11/15/30		9,522		11,244
Pool #531298 8.500% 8/15/30		809		935
Government National Mortgage Association II
Pool# MA6656 3.000% 5/20/50		12,961,512		13,556,912
Pool# MA6710 3.000% 6/20/50		13,125,099		13,761,852
Pool #MA4321 3.500% 3/20/47		7,693,549		8,282,140
Government National Mortgage Association II TBA
3.000% 8/01/49 (d)		15,850,000		16,574,394
3.500% 6/01/49 (d)		37,830,000		40,093,891

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Uniform Mortgage Backed Securities TBA
2.000% 6/01/35 (d)	$	49,350,000	$	51,609,302
3.000% 7/01/49 (d)		38,150,000		39,974,047
3.500% 3/01/49 (d)		21,950,000		23,208,696
4.000% 2/01/48 (d)		4,900,000		5,232,664
				284,905,057
Whole Loans — 0.4%
Federal Home Loan Mortgage Corp. Structured Agency Credit Risk Debt Notes
Series 2016-HQA3, Class M2, 1 mo. USD LIBOR + 1.350% 1.498% FRN 3/25/29		54,173		54,184
Series 2020-DNA3, Class M1, 1 mo. USD LIBOR + 1.500% 1.648% FRN 6/25/50 (a)		1,246,111		1,247,786
Series 2020-DNA3, Class M2, 1 mo. USD LIBOR + 3.000% 3.148% FRN 6/25/50 (a)		4,680,000		4,705,452
				6,007,422
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES (Cost $289,300,142)				291,051,242
U.S. Treasury Obligations — 8.0%
U.S. Treasury Bonds & Notes — 8.0%
U.S. Treasury Bond
2.250% 8/15/49 (e)		14,600,000		16,720,225
3.500% 2/15/39 (e)		19,800,000		26,872,948
U.S. Treasury Note
0.125% 10/15/23		23,500,000		23,479,644
0.375% 4/30/25		43,600,000		43,756,947
				110,829,764
TOTAL U.S. TREASURY OBLIGATIONS (Cost $111,834,043)				110,829,764
TOTAL BONDS & NOTES (Cost $1,323,489,899)				1,373,844,885
TOTAL PURCHASED OPTIONS (#) — 0.2% (Cost $3,506,056)				2,456,154
TOTAL LONG-TERM INVESTMENTS (Cost $1,326,995,955)				1,376,301,039
Short-Term Investments — 13.7%
Commercial Paper — 13.5%
Agilent Technologies, Inc.
0.304% 2/25/21 (a)		10,000,000		9,996,173
American Electric Power Co., Inc.
0.274% 2/18/21 (a)		2,000,000		1,999,333
American Honda Finance Corp.
0.274% 1/28/21		3,000,000		2,999,298
0.294% 3/03/21		3,500,000		3,498,059
Entergy Corp.
0.305% 3/11/21 (a)		7,000,000		6,995,277
0.386% 5/17/21 (a)		10,000,000		9,986,300

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
FMC Technologies, Inc.
0.274% 2/05/21 (a)	$	13,000,000	$	12,997,036
Intercontinental Exchange, Inc.
0.366% 6/03/21 (a) (f)		5,000,000		4,990,320
0.406% 5/11/21 (a) (f)		3,200,000		3,194,982
0.406% 6/08/21 (a) (f)		5,000,000		4,989,900
0.427% 6/29/21 (a) (f)		3,000,000		2,992,845
National Grid Holdings
0.304% 2/18/21 (a)		3,000,000		2,999,000
National Grid PLC
0.304% 1/15/21 (a)		2,000,000		1,999,858
Parker-Hannifin Corp.
0.304% 2/09/21 (a)		5,000,000		4,998,628
PPG Industries, Inc.
0.427% 8/02/21		10,000,000		9,976,757
Rogers Communications, Inc.
0.458% 8/25/21 (a)		10,000,000		9,974,062
Shell International Finance B.V.
0.254% 10/01/21 (a)		3,000,000		2,993,584
Spire, Inc.
0.264% 1/13/21 (a)		7,000,000		6,999,583
0.315% 3/23/21 (a)		6,000,000		5,996,242
Suncor Energy, Inc.
0.304% 2/10/21 (a)		4,900,000		4,898,689
0.305% 1/26/21 (a)		4,000,000		3,999,402
0.325% 3/03/21 (a)		1,850,000		1,849,168
0.325% 3/25/21 (a)		1,900,000		1,898,776
0.355% 3/25/21 (a)		3,000,000		2,998,068
Telus Corp.
0.305% 4/27/21 (a)		8,000,000		7,991,784
0.305% 6/16/21 (a)		7,000,000		6,988,440
Transcanada Pipelines Ltd.
0.314% 1/27/21 (a)		6,000,000		5,999,055
Walgreens Boots Alliance, Inc.
0.183% 1/04/21 (a)		5,000,000		4,999,872
0.335% 1/29/21 (a)		10,000,000		9,997,608
0.406% 2/24/21 (a)		5,000,000		4,997,349
Waste Management, Inc.
0.356% 7/01/21 (a)		5,000,000		4,991,962
0.458% 9/15/21 (a)		15,000,000		14,967,105
				187,154,515
Repurchase Agreement — 0.2%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (g)		2,841,017		2,841,017
TOTAL SHORT-TERM INVESTMENTS (Cost $189,977,711)				189,995,532
TOTAL INVESTMENTS — 112.9% (Cost $1,516,973,666) (h)				1,566,296,571
Other Assets/(Liabilities) — (12.9)%				(178,846,578	)
NET ASSETS — 100.0%			$	1,387,449,993

MassMutual Premier Core Bond Fund —  Portfolio of Investments (Continued)

Abbreviation Legend

ARS Auction Rate Security

CLO Collateralized Loan Obligation

FRN Floating Rate Note

STEP Step Up Bond

TBA To Be Announced

VRN Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Security is exempt from registration under Regulation S or Rule 144A of the Securities Act of 1933. These securities are considered restricted and may be resold in transactions exempt from registration. At December 31, 2020, the aggregate market value of these securities amounted to $696,667,572 or 50.21% of net assets.

(b) Security is perpetual and has no stated maturity date.

(c) Certain variable rate securities are not based on a published reference rate and spread but are determined by the issuer or agent and are based on current market conditions. These securities do not indicate a reference rate and spread in their description above. The rates shown are the current interest rates at December 31, 2020.

(d) A portion of this security is purchased on a when-issued, delayed-delivery or forward commitment basis.

(e) A portion of this security is pledged/held as collateral for open derivatives.

(f) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At December 31, 2020, these securities amounted to a value of $16,168,047 or 1.17% of net assets.

(g) Maturity value of $2,841,017. Collateralized by U.S. Government Agency obligations with a rate of 0.000%,  maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $2,897,926.

(h) See Note 3 for aggregate cost for federal tax purposes.

(#) Interest Rate Swaptions Purchased

			Paid by Fund		Received by Fund
Description	Counterparty	Expiration Date	Rate	Frequency	Rate	Frequency	Notional Amount		Value		Premium Paid (Received)		Unrealized Appreciation/ (Depreciation)
Call
10 -Year Interest Rate Swap, 12/15/42	Barclays Bank PLC	12/13/32	3-Month USD LIBOR BBA	Quarterly	2.44%	Semi-Annually	USD	5,551,000	$	556,210	$	277,507	$	278,703
Put
10 -Year Interest Rate Swap, 12/15/42	Barclays Bank PLC	12/13/32	2.94%	Semi-Annually	3-Month USD LIBOR BBA	Quarterly	USD	64,580,000	$	1,899,944	$	3,228,549	$	(1,328,605	)
									$	2,456,154	$	3,506,056	$	(1,049,902	)

Futures contracts

	Expiration Date	Number of Contracts		Notional Amount			Value/ Net Unrealized Appreciation/ (Depreciation)
Long
U.S. Treasury Long Bond	3/22/21		88	$	15,364,481		$	(123,981	)
U.S. Treasury Ultra Bond	3/22/21		357		77,591,470			(1,349,657	)
U.S. Treasury Note 2 Year	3/31/21		580		128,043,977			122,429
U.S. Treasury Note 5 Year	3/31/21		303		38,141,070			86,641
							$	(1,264,568	)
Short
90 Day Eurodollar	3/15/21		12	$	(2,926,460	)	$	(68,440	)
U.S. Treasury Ultra 10 Year	3/22/21		10		(1,564,656	)		1,062
90 Day Eurodollar	9/13/21		21		(5,122,093	)		(118,982	)
90 Day Eurodollar	3/14/22		19		(4,632,849	)		(108,601	)
90 Day Eurodollar	9/19/22		17		(4,143,482	)		(97,806	)
90 Day Eurodollar	3/13/23		14		(3,410,179	)		(80,896	)
90 Day Eurodollar	12/18/23		19		(4,623,825	)		(103,138	)
90 Day Eurodollar	12/16/24		50		(12,152,959	)		(253,291	)
							$	(830,092	)

Currency Legend

USD U.S. Dollar

MassMutual Premier Diversified Bond Fund — Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 0.2%
Common Stock — 0.0%
Basic Materials — 0.0%
Forest Products & Paper — 0.0%
The Newark Group, Inc. (a) (b)		26,904	$	807
Energy — 0.0%
Oil & Gas — 0.0%
Jupiter Resources, Inc. (a) (b) (c)		18,661		59,715
TOTAL COMMON STOCK (Cost $92,228)				60,522
Preferred Stock — 0.2%
Financial — 0.2%
Insurance — 0.2%
Selective Insurance Group, Inc. 4.600%		18,825		486,438
TOTAL PREFERRED STOCK (Cost $470,625)				486,438
TOTAL EQUITIES (Cost $562,853)				546,960

	Principal Amount
Bonds & Notes — 95.2%
Corporate Debt — 45.8%
Aerospace & Defense — 0.6%
BAE Systems PLC 3.000% 9/15/50 (d)	$	230,000	239,987
TransDigm, Inc. 5.500% 11/15/27		250,000	262,825
6.250% 3/15/26 (d)		500,000	532,500
6.375% 6/15/26		225,000	232,875
			1,268,187
Agriculture — 0.7%
BAT Capital Corp. 2.259% 3/25/28		320,000	332,175
4.700% 4/02/27		200,000	235,175
4.758% 9/06/49		165,000	191,294
Imperial Brands Finance PLC 3.500% 7/26/26 (d)		300,000	332,058
3.875% 7/26/29 (d)		320,000	357,678

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Reynolds American, Inc. 5.850% 8/15/45	$	150,000	$	191,812
				1,640,192
Airlines — 0.0%
United Airlines Pass-Through Trust, Series 2018-1, Class B, 4.600% 9/01/27		82,348		81,472
Auto Manufacturers — 1.6%
Ford Motor Co. 7.450% 7/16/31		270,000		346,275
Ford Motor Credit Co. LLC 3.087% 1/09/23		310,000		315,408
3.336% 3/18/21		825,000		827,062
4.140% 2/15/23		285,000		293,550
5.085% 1/07/21		200,000		200,000
General Motors Co. 4.200% 10/01/27		215,000		243,626
5.150% 4/01/38		230,000		276,540
5.200% 4/01/45		225,000		273,246
General Motors Financial Co., Inc. 3.500% 11/07/24		315,000		340,408
4.150% 6/19/23		255,000		274,334
4.200% 11/06/21		245,000		252,526
				3,642,975
Banks — 4.6%
Associated Banc-Corp. 4.250% 1/15/25		413,000		447,503
Banco General SA 4.125% 8/07/27 (d)		260,000		294,453
Bank of America Corp. SOFR + 2.150% 2.592% VRN 4/29/31		300,000		321,527
3 mo. USD LIBOR + 1.310% 4.271% VRN 7/23/29		200,000		238,149
6.110% 1/29/37		190,000		276,741
7.750% 5/14/38		125,000		213,126
The Bank of Nova Scotia 3 mo. USD LIBOR + 2.648% 4.650% VRN (e)		550,000		552,750
Barclays Bank PLC 10.179% 6/12/21 (d)		800,000		832,039
Barclays PLC 4.375% 9/11/24		200,000		222,521
Citigroup, Inc. 4.600% 3/09/26		295,000		345,707
5.250% 3/07/25		500,000		567,500
5.875% 1/30/42		100,000		151,883
6.000% 10/31/33		85,000		116,822
Credit Suisse AG 6.500% 8/08/23 (d)		575,000		646,751
First Republic Bank 4.375% 8/01/46		510,000		645,536
Fulton Financial Corp. 3.600% 3/16/22		240,000		246,244
The Goldman Sachs Group, Inc. 5.150% 5/22/45		290,000		404,138
5.950% 1/15/27		170,000		214,294
6.250% 2/01/41		35,000		54,816

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
6.750% 10/01/37	$	165,000	$	252,477
HSBC Holdings PLC 4.250% 3/14/24		200,000		220,669
4.250% 8/18/25		477,000		541,954
6.500% 9/15/37		125,000		182,918
Huntington Bancshares, Inc. 3 mo. USD LIBOR + 2.880% 5.700% VRN (e)		510,000		512,550
JP Morgan Chase & Co. SOFR + 2.515% 2.956% VRN 5/13/31		235,000		257,699
4.950% 6/01/45		170,000		240,843
NBK Tier 1 Financing 2 Ltd. 6 year USD Swap + 2.832% 4.500% VRN (d) (e)		685,000		698,700
Nordea Bank Abp 5 year CMT + 4.110% 6.625% VRN (d) (e)		405,000		464,737
Valley National Bancorp 5.125% 9/27/23		110,000		119,807
Wells Fargo & Co. 5.606% 1/15/44		105,000		148,816
				10,433,670
Beverages — 0.8%
Anheuser-Busch InBev Worldwide, Inc. 4.600% 4/15/48		255,000		322,677
8.200% 1/15/39		250,000		431,914
Bacardi Ltd. 5.150% 5/15/38 (d)		200,000		255,819
Becle SAB de CV 3.750% 5/13/25 (d)		350,000		380,724
Molson Coors Beverage Co. 4.200% 7/15/46		191,000		219,165
5.000% 5/01/42		135,000		168,952
				1,779,251
Building Materials — 0.4%
Standard Industries, Inc. 4.375% 7/15/30 (d)		200,000		213,946
4.750% 1/15/28 (d)		151,000		158,927
5.000% 2/15/27 (d)		490,000		512,050
				884,923
Chemicals — 1.2%
CF Industries, Inc. 4.950% 6/01/43		200,000		245,500
5.375% 3/15/44		128,000		162,017
DuPont de Nemours, Inc. 5.319% 11/15/38		345,000		467,270
Syngenta Finance NV 3.933% 4/23/21 (d)		325,000		327,181
4.892% 4/24/25 (d)		500,000		536,627
5.182% 4/24/28 (d)		200,000		214,434
Yara International ASA 4.750% 6/01/28 (d)		690,000		818,207
				2,771,236

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Commercial Services — 0.0%
ERAC USA Finance LLC 7.000% 10/15/37 (d)		50,000	$	77,548
Computers — 1.1%
Dell International LLC/EMC Corp. 6.020% 6/15/26 (d)		375,000		457,479
8.350% 7/15/46 (d)		275,000		416,025
Genpact Luxembourg Sarl 3.700% STEP 4/01/22		435,000		443,528
Leidos, Inc. 2.300% 2/15/31 (d)		90,000		91,638
4.375% 5/15/30 (d)		135,000		161,656
5.500% 7/01/33		226,000		276,976
Lenovo Group Ltd. 3.421% 11/02/30 (d)		495,000		520,301
				2,367,603
Distribution & Wholesale — 0.3%
H&E Equipment Services, Inc. 3.875% 12/15/28 (d)		600,000		606,420
Diversified Financial Services — 4.2%
AerCap Ireland Capital DAC/AerCap Global Aviation Trust 4.500% 9/15/23		315,000		341,530
6.500% 7/15/25		285,000		340,703
Air Lease Corp. 2.875% 1/15/26		950,000		1,005,227
Aircastle Ltd. 4.125% 5/01/24		200,000		211,528
4.400% 9/25/23		275,000		291,406
Alliance Data Systems Corp. 7.000% 1/15/26 (d)		200,000		211,560
Ally Financial, Inc. 8.000% 11/01/31		651,000		955,583
Antares Holdings LP 6.000% 8/15/23 (d)		790,000		805,660
8.500% 5/18/25 (d)		330,000		355,738
Ares Finance Co. LLC 4.000% 10/08/24 (d)		375,000		402,776
Avolon Holdings Funding Ltd. 4.375% 5/01/26 (d)		205,000		222,075
5.125% 10/01/23 (d)		325,000		347,679
BGC Partners, Inc. 4.375% 12/15/25 (d)		435,000		460,129
Brookfield Finance, Inc. 4.350% 4/15/30		405,000		485,014
4.850% 3/29/29		208,000		254,808
GE Capital International Funding Co. Unlimited Co. 4.418% 11/15/35		230,000		274,516
Global Aircraft Leasing Co. Ltd. 6.500% 9/15/24 (d)		616,568		550,287
Lazard Group LLC 3.625% 3/01/27		196,000		215,495
3.750% 2/13/25		125,000		138,814
4.500% 9/19/28		275,000		326,379
LeasePlan Corp. NV 2.875% 10/24/24 (d)		330,000		348,697

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Legg Mason, Inc. 5.625% 1/15/44	$	235,000	$	337,214
Park Aerospace Holdings Ltd. 4.500% 3/15/23 (d)		250,000		261,981
5.250% 8/15/22 (d)		415,000		435,547
				9,580,346
Electric — 1.4%
Berkshire Hathaway Energy Co. 5.950% 5/15/37		120,000		174,110
The Cleveland Electric Illuminating Co. 5.950% 12/15/36		175,000		213,854
CMS Energy Corp. 4.700% 3/31/43		115,000		147,930
4.875% 3/01/44		180,000		237,076
Elwood Energy LLC 8.159% 7/05/26		171,251		181,526
Enel Finance International NV 6.000% 10/07/39 (d)		175,000		249,686
Entergy Louisiana LLC 4.950% 1/15/45		110,000		121,390
FirstEnergy Transmission LLC 4.550% 4/01/49 (d)		195,000		227,727
Indianapolis Power & Light Co. 4.050% 5/01/46 (d)		110,000		134,333
Infraestructura Energetica Nova SAB de CV 3.750% 1/14/28 (d)		200,000		213,250
ITC Holdings Corp. 2.950% 5/14/30 (d)		210,000		229,536
Pacific Gas and Electric Co. 3.750% 7/01/28		320,000		349,740
4.300% 3/15/45		195,000		207,901
Virginia Electric & Power Co. 6.000% 1/15/36		100,000		145,238
Xcel Energy, Inc. 6.500% 7/01/36		270,000		405,495
				3,238,792
Electronics — 0.2%
Ingram Micro, Inc. 5.450% STEP 12/15/24		335,000		385,331
Entertainment — 0.2%
Live Nation Entertainment, Inc. 5.625% 3/15/26 (d)		77,000		79,118
Wynn Resorts Finance LLC / Wynn Resorts Capital Corp. 5.125% 10/01/29 (d)		382,000		400,145
				479,263
Foods — 0.8%
Albertsons Cos., Inc. / Safeway, Inc. / New Albertsons LP / Albertson's LLC 4.625% 1/15/27 (d)		521,000		554,214
JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc. 5.500% 1/15/30 (d)		700,000		804,132
Mars, Inc. 3.950% 4/01/49 (d)		150,000		191,139

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Smithfield Foods, Inc. 3.000% 10/15/30 (d)	$	206,000	$	217,964
				1,767,449
Forest Products & Paper — 0.1%
Fibria Overseas Finance Ltd. 4.000% 1/14/25		225,000		240,471
Gas — 0.2%
NiSource, Inc. 4.800% 2/15/44		295,000		386,377
Health Care – Services — 0.9%
Centene Corp. 4.625% 12/15/29		153,000		169,862
HCA, Inc. 3.500% 9/01/30		1,064,000		1,130,581
5.375% 2/01/25		350,000		393,586
IHC Health Services, Inc. 4.131% 5/15/48		275,000		357,256
				2,051,285
Home Builders — 0.5%
Mattamy Group Corp. 5.250% 12/15/27 (d)		227,000		240,052
PulteGroup, Inc. 5.000% 1/15/27		198,000		233,640
Taylor Morrison Communities, Inc. 5.750% 1/15/28 (d)		500,000		566,250
				1,039,942
Insurance — 5.7%
Allstate Corp. 3 mo. USD LIBOR + 2.938% 5.750% VRN 8/15/53		640,000		684,838
American International Group, Inc. 3.400% 6/30/30		220,000		252,087
4.750% 4/01/48		95,000		126,749
3 mo. USD LIBOR + 2.868% 5.750% VRN 4/01/48		755,000		863,056
AmTrust Financial Services, Inc. 6.125% 8/15/23		765,000		755,461
Arch Capital Group Ltd. 3.635% 6/30/50		375,000		436,414
Arch Capital Group US, Inc. 5.144% 11/01/43		80,000		107,725
Athene Global Funding 2.500% 1/14/25 (d)		300,000		314,261
Athene Holding Ltd. 4.125% 1/12/28		309,000		344,347
6.150% 4/03/30		595,000		740,197
AXIS Specialty Finance LLC 3.900% 7/15/29		375,000		413,513
5 year CMT + 3.186% 4.900% VRN 1/15/40		490,000		512,673
AXIS Specialty Finance PLC 4.000% 12/06/27		210,000		234,150
Brighthouse Financial, Inc. 4.700% 6/22/47		500,000		522,123
5.625% 5/15/30		260,000		320,965

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
CNO Financial Group, Inc. 5.250% 5/30/25	$	535,000	$	621,016
5.250% 5/30/29		200,000		241,449
Enstar Finance LLC 5 year CMT + 5.468% 5.750% VRN 9/01/40		825,000		868,854
Enstar Group Ltd. 4.500% 3/10/22		495,000		513,823
4.950% 6/01/29		575,000		650,421
Equitable Holdings, Inc. 5 year CMT + 4.736% 4.950% VRN (e)		280,000		297,850
5.000% 4/20/48		225,000		296,359
Markel Corp. 5 year CMT + 5.662% 6.000% VRN (e)		735,000		813,094
MetLife Capital Trust IV 7.875% 12/15/67 (d)		225,000		317,250
Prudential Financial, Inc. 5 year CMT + 3.035% 3.700% VRN 10/01/50		220,000		232,712
3 mo. USD LIBOR + 3.920% 5.625% VRN 6/15/43		200,000		214,485
3 mo. USD LIBOR + 2.665% 5.700% VRN 9/15/48		350,000		404,080
6.200% 11/15/40		125,000		174,866
Teachers Insurance & Annuity Association of America 4.270% 5/15/47 (d)		175,000		218,831
USF&G Capital I 8.500% 12/15/45 (d)		95,000		153,039
XLIT Ltd. 5.500% 3/31/45		200,000		279,800
				12,926,488
Internet — 0.3%
Amazon.com, Inc. 4.050% 8/22/47		260,000		343,318
Netflix, Inc. 4.875% 6/15/30 (d)		166,000		190,900
Prosus NV 3.680% 1/21/30 (d)		220,000		239,393
				773,611
Investment Companies — 1.7%
Ares Capital Corp. 3.500% 2/10/23		610,000		642,590
4.200% 6/10/24		525,000		566,704
BlackRock TCP Capital Corp. 3.900% 8/23/24		170,000		177,623
4.125% 8/11/22		845,000		881,039
Icahn Enterprises LP/ Icahn Enterprises Finance Corp. 4.750% 9/15/24		500,000		519,375
6.750% 2/01/24		200,000		203,396
Sixth Street Specialty Lending, Inc. 3.875% 11/01/24		770,000		793,760
				3,784,487
Iron & Steel — 0.4%
Vale Overseas Ltd. 6.250% 8/10/26		470,000		582,800

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
6.875% 11/21/36	$	150,000	$	219,845
				802,645
Machinery – Diversified — 0.1%
The Toro Co. 7.800% 6/15/27		170,000		224,171
Media — 2.4%
CCO Holdings LLC/CCO Holdings Capital Corp. 5.000% 2/01/28 (d)		250,000		264,375
Comcast Corp. 3.450% 2/01/50		145,000		171,110
4.600% 8/15/45		400,000		540,334
CSC Holdings LLC 4.625% 12/01/30 (d)		250,000		260,938
5.750% 1/15/30 (d)		200,000		219,250
Discovery Communications LLC 4.000% 9/15/55 (d)		235,000		263,035
4.650% 5/15/50		55,000		68,791
DISH DBS Corp. 7.375% 7/01/28		500,000		532,500
Grupo Televisa SAB 6.625% 3/18/25		275,000		334,375
Time Warner Cable, Inc. 4.500% 9/15/42		250,000		292,949
6.750% 6/15/39		115,000		163,669
ViacomCBS, Inc. 4.200% 5/19/32		355,000		427,827
4.950% 1/15/31		220,000		276,128
VTR Finance NV 6.375% 7/15/28 (d)		900,000		983,250
The Walt Disney Co. 3.600% 1/13/51		345,000		417,622
6.650% 11/15/37		200,000		316,065
				5,532,218
Mining — 1.1%
First Quantum Minerals Ltd. 6.875% 3/01/26 (d)		1,000,000		1,042,500
Glencore Finance Canada Ltd. 5.550% STEP 10/25/42 (d)		149,000		182,731
Glencore Funding LLC 3.875% 10/27/27 (d)		260,000		292,994
4.625% 4/29/24 (d)		200,000		223,356
Perenti Finance Pty Ltd. 6.500% 10/07/25 (d)		325,000		345,729
Teck Resources Ltd. 5.200% 3/01/42		97,000		110,759
6.250% 7/15/41		143,000		182,823
				2,380,892
Miscellaneous - Manufacturing — 0.1%
General Electric Co. 4.125% 10/09/42		12,000		14,067

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
6.875% 1/10/39	$	72,000	$	105,990
				120,057
Office Equipment/Supplies — 0.1%
CDW LLC / CDW Finance Corp. 4.250% 4/01/28		206,000		217,487
Oil & Gas — 3.0%
BP Capital Markets PLC 5 year CMT + 4.036% 4.375% VRN (e)		905,000		968,395
Cenovus Energy, Inc. 4.250% 4/15/27		350,000		382,208
6.750% 11/15/39		175,000		231,367
Continental Resources, Inc. 5.000% 9/15/22		137,000		137,206
Devon Energy Corp. 5.000% 6/15/45		289,000		340,406
EQT Corp. 3.900% 10/01/27		860,000		854,367
7.875% STEP 2/01/25		380,000		432,725
Marathon Petroleum Corp. 4.500% 4/01/48		85,000		94,222
6.500% 3/01/41		175,000		234,955
Occidental Petroleum Corp. 2.900% 8/15/24		187,000		179,987
5.875% 9/01/25		300,000		319,500
6.375% 9/01/28		300,000		316,500
6.600% 3/15/46		235,000		238,449
6.950% 7/01/24		177,000		191,160
Ovintiv Exploration, Inc. 5.750% 1/30/22		93,000		96,595
Ovintiv, Inc. 6.500% 2/01/38		160,000		178,665
Patterson-UTI Energy, Inc. 3.950% 2/01/28		350,000		323,098
5.150% 11/15/29		615,000		563,176
Petroleos Mexicanos 5.350% 2/12/28		190,000		187,957
6.375% 1/23/45		35,000		32,078
6.500% 3/13/27		65,000		68,457
6.625% 6/15/38		51,000		49,062
Saudi Arabian Oil Co. 4.250% 4/16/39 (d)		385,000		451,446
				6,871,981
Oil & Gas Services — 0.4%
Halliburton Co. 5.000% 11/15/45		220,000		261,530
National Oilwell Varco, Inc. 3.600% 12/01/29		275,000		287,566
3.950% 12/01/42		314,000		319,429
				868,525
Packaging & Containers — 0.0%
Mauser Packaging Solutions Holding Co. 5.500% 4/15/24 (d)		49,000		49,967

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Pharmaceuticals — 1.8%
AbbVie, Inc. 4.700% 5/14/45	$	350,000	$	457,875
Bausch Health Americas, Inc. 9.250% 4/01/26 (d)		400,000		446,000
Bausch Health Cos., Inc. 5.250% 1/30/30 (d)		250,000		262,500
6.125% 4/15/25 (d)		113,000		116,465
7.000% 3/15/24 (d)		115,000		118,306
Bristol-Myers Squibb Co. 4.350% 11/15/47		205,000		276,110
Cigna Corp. 4.800% 7/15/46		185,000		243,846
CVS Health Corp. 5.050% 3/25/48		115,000		155,857
6.125% 9/15/39		25,000		35,286
CVS Pass-Through Trust 5.926% 1/10/34 (d)		184,987		224,367
7.507% 1/10/32 (d)		13,644		16,773
McKesson Corp. 4.883% 3/15/44		70,000		88,263
Par Pharmaceutical, Inc. 7.500% 4/01/27 (d)		488,000		529,480
Takeda Pharmaceutical Co. Ltd. 3.375% 7/09/60		235,000		260,577
Utah Acquisition Sub, Inc. 5.250% 6/15/46		350,000		458,528
Viatris, Inc. 2.700% 6/22/30 (d)		280,000		297,115
				3,987,348
Pipelines — 2.3%
Energy Transfer Operating LP 4.200% 4/15/27		320,000		352,692
4.750% 1/15/26		200,000		226,298
6.125% 12/15/45		280,000		330,763
3 mo. USD LIBOR + 4.028% 6.250% VRN (e)		740,000		588,300
5 year CMT + 5.134% 6.750% VRN (e)		270,000		246,375
EnLink Midstream Partners LP 4.150% 6/01/25		339,000		330,525
4.850% 7/15/26		154,000		150,356
3 mo. USD LIBOR + 4.110% 6.000% VRN (e)		375,000		218,325
Enterprise Products Operating LLC 3 mo. USD LIBOR + 2.570% 5.375% VRN 2/15/78		200,000		202,099
EQM Midstream Partners LP 4.750% 7/15/23		375,000		394,305
MPLX LP 4.500% 4/15/38		195,000		223,044
3 mo. USD LIBOR + 4.652% 6.875% VRN (e)		850,000		820,250
Plains All American Pipeline LP/PAA Finance Corp. 3.800% 9/15/30		265,000		284,889
4.500% 12/15/26		232,000		259,866
4.700% 6/15/44		260,000		269,596
6.650% 1/15/37		175,000		213,623

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Sunoco Logistics Partners Operations LP 5.300% 4/01/44	$	175,000	$	189,110
				5,300,416
Private Equity — 0.7%
Apollo Management Holdings LP 5 year CMT + 3.266% 4.950% VRN 1/14/50 (d)		175,000		178,849
Hercules Capital, Inc. 4.625% 10/23/22		945,000		960,667
KKR Group Finance Co. VI LLC 3.750% 7/01/29 (d)		280,000		325,809
KKR Group Finance Co. VIII LLC 3.500% 8/25/50 (d)		160,000		177,569
				1,642,894
Real Estate Investment Trusts (REITS) — 2.4%
Agree LP 2.900% 10/01/30		110,000		116,852
Crown Castle International Corp. 5.200% 2/15/49		24,000		32,683
ESH Hospitality, Inc. 4.625% 10/01/27 (d)		363,000		372,075
Healthcare Trust of America Holdings LP 3.750% 7/01/27		240,000		272,053
Host Hotels & Resorts LP 3.500% 9/15/30		476,000		501,486
Iron Mountain, Inc. 5.250% 7/15/30 (d)		250,000		270,000
Service Properties Trust 4.950% 10/01/29		590,000		591,475
Spirit Realty LP
3.200% 1/15/27		220,000		233,691
3.400% 1/15/30		325,000		352,471
4.000% 7/15/29		385,000		433,471
4.450% 9/15/26		59,000		66,566
STORE Capital Corp. 4.625% 3/15/29		250,000		290,018
Tanger Properties LP 3.750% 12/01/24		430,000		450,904
Ventas Realty LP 5.700% 9/30/43		85,000		110,051
VEREIT Operating Partnership LP 2.850% 12/15/32		20,000		20,913
3.100% 12/15/29		460,000		496,293
3.400% 1/15/28		105,000		115,914
4.625% 11/01/25		495,000		569,748
WP Carey, Inc. 2.400% 2/01/31		120,000		124,626
				5,421,290
Retail — 0.6%
Advance Auto Parts, Inc. 1.750% 10/01/27		70,000		71,092
AutoZone, Inc. 1.650% 1/15/31		225,000		223,160

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
El Puerto de Liverpool SAB de CV 3.950% 10/02/24 (d)	$	280,000	$	300,653
O'Reilly Automotive, Inc. 4.200% 4/01/30		210,000		252,973
Penske Automotive Group, Inc. 5.500% 5/15/26		500,000		519,375
				1,367,253
Semiconductors — 0.1%
KLA Corp. 3.300% 3/01/50		190,000		214,405
Software — 0.3%
CDK Global, Inc. 5.250% 5/15/29 (d)		256,000		283,627
Oracle Corp. 3.600% 4/01/50		210,000		244,668
Solera LLC/ Solera Finance, Inc. 10.500% 3/01/24 (d)		237,000		245,591
				773,886
Telecommunications — 2.1%
AT&T, Inc. 3.500% 9/15/53 (d)		617,000		617,905
3.550% 9/15/55 (d)		814,000		811,237
CommScope, Inc. 8.250% 3/01/27 (d)		850,000		907,375
Empresa Nacional de Telecomunicaciones SA 4.875% 10/30/24 (d)		200,000		216,002
Hughes Satellite Systems Corp. 6.625% 8/01/26		444,000		502,373
Qwest Corp 6.750% 12/01/21		156,000		163,199
Sprint Capital Corp. 6.875% 11/15/28		500,000		659,240
T-Mobile USA, Inc. 5.375% 4/15/27		165,000		177,979
Telefonica Emisiones SAU 4.665% 3/06/38		335,000		402,161
Verizon Communications, Inc. 2.875% 11/20/50		160,000		161,216
2.987% 10/30/56 (d)		223,000		224,475
				4,843,162
Transportation — 0.4%
CSX Corp. 4.750% 11/15/48		145,000		198,894
Kenan Advantage Group, Inc. 7.875% 7/31/23 (d)		720,000		720,000
				918,894
TOTAL CORPORATE DEBT (Cost $94,943,463)				103,744,810

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Non-U.S. Government Agency Obligations — 31.1%
Automobile Asset-Backed Securities — 2.0%
Avis Budget Rental Car Funding AESOP LLC, Series 2019-1A, Class C 4.530% 3/20/23 (d)	$	222,000	$	224,234
Hertz Vehicle Financing II LP Series 2018-1A, Class B, 3.600% 2/25/24 (d)		650,000		649,974
Series 2019-2A, Class C, 4.260% 5/25/25 (d)		730,000		724,150
Series 2017-2A, Class C, 5.310% 10/25/23 (d)		100,000		98,830
OneMain Direct Auto Receivables Trust Series 2019-1A, Class C, 4.190% 11/14/28 (d)		888,000		968,697
Series 2019-1A, Class D, 4.680% 4/14/31 (d)		422,000		461,882
Santander Revolving Auto Loan Trust Series 2019-A, Class B, 2.800% 1/26/32 (d)		195,000		204,227
Series 2019-A, Class C, 3.000% 1/26/32 (d)		121,000		127,053
Series 2019-A, Class D, 3.450% 1/26/32 (d)		957,000		1,002,018
				4,461,065
Commercial Mortgage-Backed Securities — 7.1%
Aventura Mall Trust, Series 2018-AVM, Class D, 4.112% VRN 7/05/40 (d) (f)		530,000		433,084
BAMLL Commercial Mortgage Securities Trust Series 2018-DSNY, Class C, 1 mo. USD LIBOR + 1.350% 1.509% FRN 9/15/34 (d)		150,000		145,147
Series 2019-BPR, Class CMP, 3.895% VRN 11/05/32 (d) (f)		440,000		405,473
Series 2019-BPR, Class DMP, 3.895% VRN 11/05/32 (d) (f)		540,000		464,593
BANK Series 2020-BN30, Class MCDF, 2.918% VRN 12/15/53 (f)		500,000		483,133
Series 2019-BN17, Class C, 4.517% VRN 4/15/52 (f)		331,000		370,888
BBCMS Mortgage Trust Series 2018-CHRS, Class B, 4.267% VRN 8/05/38 (d) (f)		400,000		365,043
Series 2018-CHRS, Class C, 4.267% VRN 8/05/38 (d) (f)		280,000		237,216
Series 2018-CHRS, Class D, 4.267% VRN 8/05/38 (d) (f)		270,000		208,631
BHMS Mortgage Trust, Series 2018-ATLS, Class B, 1 mo. USD LIBOR + 1.500% 1.659% FRN 7/15/35 (d)		900,000		864,022
BX Commercial Mortgage Trust Series 2018-IND, Class E, 1 mo. USD LIBOR + 1.700% 1.859% FRN 11/15/35 (d)		504,000		502,597
Series 2019-XL, Class E, 1 mo. USD LIBOR + 1.800% 1.959% FRN 10/15/36 (d)		356,936		354,827
Series 2019-XL, Class F, 1 mo. USD LIBOR + 2.000% 2.159% FRN 10/15/36 (d)		654,066		645,299
CAMB Commercial Mortgage Trust, Series 2019-LIFE, Class E, 1 mo. USD LIBOR + 2.150% 2.309% FRN 12/15/37 (d)		572,453		568,764
Century Plaza Towers Series 2019-CPT, Class D, 2.997% VRN 11/13/39 (d) (f)		225,000		224,918
Series 2019-CPT, Class E, 2.997% VRN 11/13/39 (d) (f)		316,000		304,032
Citigroup Commercial Mortgage Trust Series 2019-GC41, Class C, 3.502% 8/10/56		222,000		224,281
Series 2019-SMRT, Class C, 4.682% 1/10/36 (d)		315,000		337,041
Cold Storage Trust, Series 2020-ICE5, Class E, 1 mo. USD LIBOR + 2.766% 2.924% FRN 11/15/37 (d)		600,000		598,501
Commercial Mortgage Pass-Through Certificates Series 2014-UBS2, Class AM, 4.199% 3/10/47		100,000		107,595
Series 2015-CR23, Class C, 4.291% VRN 5/10/48 (f)		110,000		115,081

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Credit Suisse Mortgage Capital Certificates, Series 2019-ICE4, Class D, 1 mo. USD LIBOR + 1.600% 1.759% FRN 5/15/36 (d)	$	560,000	$	554,405
DC Office Trust Series 2019-MTC, Class D, 3.072% VRN 9/15/45 (d) (f)		357,000		356,378
Series 2019-MTC, Class E, 3.072% VRN 9/15/45 (d) (f)		622,000		520,066
GB Trust Series 2020-FLIX, Class C, 1 mo. USD LIBOR + 1.600% 1.759% FRN 8/15/37 (d)		242,000		242,601
Series 2020-FLIX, Class D, 1 mo. USD LIBOR + 2.350% 2.509% FRN 8/15/37 (d)		394,000		396,184
GS Mortgage Securities Corp. II, Series 2018-GS10, Class D 3.000% 7/10/51 (d)		599,000		471,137
Hudson Yards Mortgage Trust, Series 2019-30HY, Class E, 3.443% VRN 7/10/39 (d) (f)		630,000		648,041
Jackson Park Trust, Series 2019-LIC, Class D, 3.242% VRN 10/14/39 (d) (f)		686,000		654,818
JP Morgan Chase Commercial Mortgage Securities Trust, Series 2019-OSB, Class E, 3.783% VRN 6/05/39 (d) (f)		553,000		503,539
JPMBB Commercial Mortgage Securities Trust Series 2015-C27, Class C, 4.307% VRN 2/15/48 (f)		1,065,400		1,080,115
Series 2014-C21, Class C, 4.657% VRN 8/15/47 (f)		300,000		296,789
KNDL Mortgage Trust, Series 2019-KNSQ, Class E, 1 mo. USD LIBOR + 1.800% 1.959% FRN 5/15/36 (d)		263,000		261,711
Manhattan West Series 2020-1MW, Class C, 2.335% VRN 9/10/39 (d) (f)		601,000		616,466
Series 2020-1MW, Class D, 2.335% VRN 9/10/39 (d) (f)		440,000		439,028
MFT Trust Series 2020-ABC, Class A, 3.358% 2/10/42 (d)		205,000		215,654
Series 2020-ABC, Class B, 3.477% VRN 2/10/42 (d) (f)		215,000		223,032
MKT Mortgage Trust, Series 2020-525M, Class E, 2.941% VRN 2/12/40 (d) (f)		213,000		204,297
Wells Fargo Commercial Mortgage Trust, Series 2015-NXS1, Class C, 3.848% VRN 5/15/48 (f)		140,000		141,182
WF-RBS Commercial Mortgage Trust Series 2012-C8, Class C, 4.885% VRN 8/15/45 (f)		100,000		97,119
Series 2011-C5, Class C, 5.656% VRN 11/15/44 (d) (f)		170,000		171,262
Series 2011-C5, Class D, 5.656% VRN 11/15/44 (d) (f)		115,000		112,326
				16,166,316
Home Equity Asset-Backed Securities — 0.1%
Credit Suisse Seasoned Loan Trust, Series 2006-1, Class A, 1 mo. USD LIBOR + .240% 0.388% FRN 10/25/34 (d)		47,947		47,625
Mastr Asset-Backed Securities Trust, Series 2005, Class NC1 M1, 1 mo. USD LIBOR + .720% 0.868% FRN 12/25/34		90,213		84,748
				132,373
Other Asset-Backed Securities — 15.1%
321 Henderson Receivables LLC, Series 2015-1A, Class A 3.260% 9/15/72 (d)		67,697		74,009
AASET Trust Series 2019-1, Class A, 3.844% 5/15/39 (d)		364,926		344,633
Series 2018-2A, Class A, 4.454% 11/18/38 (d)		613,716		579,789

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2019-2, Class C, 6.413% 10/16/39 (d)	$	1,133,714	$	516,389
AGL CLO 7 Ltd., Series 2020-7A, Class A1, 3 mo. USD LIBOR + 1.800% 2.050% FRN 7/15/31 (d)		300,000		301,039
AIMCO CLO Ltd., Series 2018-AA, Class B, 3 mo. USD LIBOR + 1.400% 1.618% FRN 4/17/31 (d)		250,000		248,208
Anchorage Capital CLO Ltd. Series 2019-11A, Class A, 3 mo. USD LIBOR + 1.390% 1.606% FRN 7/22/32 (d)		500,000		500,615
Series 2020-15A, Class A, 3 mo. USD LIBOR + 1.850% 2.089% FRN 7/20/31 (d)		250,000		251,012
Series 2019-11A, Class C, 3 mo. USD LIBOR + 3.000% 3.216% FRN 7/22/32 (d)		250,000		250,639
Argent Securities, Inc. Asset-Backed Pass-Through Certificates, Series 2004-W10, Class M1, 1 mo. USD LIBOR + .900% 1.048% FRN 10/25/34		232,898		224,177
Atrium XV, Series 15A, Class B, 3 mo. USD LIBOR + 1.750% 1.959% FRN 1/23/31 (d)		250,000		249,694
Avery Point VII CLO Ltd., Series 2015-7A, Class DR, 3 mo. USD LIBOR + 3.600% 3.837% FRN 1/15/28 (d)		250,000		248,754
Benefit Street Partners CLO X Ltd., Series 2016-10A, Class CR, 3 mo. USD LIBOR + 3.500% 3.737% FRN 1/15/29 (d)		250,000		246,502
Benefit Street Partners CLO XVIII Ltd., Series 2019-18A, Class B, 3 mo. USD LIBOR + 1.950% 2.187% FRN 10/15/32 (d)		250,000		250,296
Blackbird Capital Aircraft Lease Securitization Ltd., Series 2016-1A, Class A, 4.213% STEP 12/16/41 (d)		377,983		360,231
BRE Grand Islander Timeshare Issuer LLC Series 2017-1A, Class A, 2.940% 5/25/29 (d)		77,056		77,380
Series 2017-1A, Class B, 3.240% 5/25/29 (d)		63,655		63,695
Business Jet Securities LLC, Series 2020-1A, Class A 2.981% 11/15/35 (d)		160,180		162,340
Canyon Capital CLO Ltd., Series 2019-2A, Class C, 3 mo. USD LIBOR + 2.750% 2.987% FRN 10/15/32 (d)		250,000		250,274
Capital Automotive REIT Series 2014-1A, Class A, 3.660% 10/15/44 (d)		92,364		92,315
Series 2017-1A, Class A2, 4.180% 4/15/47 (d)		147,105		147,444
Series 2020-1A, Class B1, 4.170% 2/15/50 (d)		242,000		251,995
Series 2020-1A, Class B3, 4.950% 2/15/50 (d)		671,000		672,732
Castlelake Aircraft Securitization Trust, Series 2019-1A, Class A 3.967% 4/15/39 (d)		204,970		194,925
CF Hippolyta LLC, Series 2020-1, Class B1, 1 mo. USD LIBOR + 1.850%, 2.280% FRN 7/15/60 (d)		122,160		124,050
CIFC Funding Ltd., Series 2017-5A, Class A1, 3 mo. USD LIBOR + 1.180% 1.398% FRN 11/16/30 (d)		250,000		249,917
CLI Funding VI LLC Series 2020-3A, Class A, 2.070% 10/18/45 (d)		778,000		774,993
Series 2019-1A, Class B, 4.640% 5/18/44 (d)		107,767		108,093
Crestline Denali CLO XIV Ltd. Series 2016-1A, Class A1R, 3 mo. USD LIBOR + 1.280% 1.489% FRN 10/23/31 (d)		349,621		349,629
Series 2016-1A, Class BR, 3 mo. USD LIBOR + 1.800% 2.009% FRN 10/23/31 (d)		250,000		246,704
DB Master Finance LLC

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2019-1A, Class A2II, 4.021% 5/20/49 (d)	$	321,925	$	337,136
Series 2019-1A, Class A23, 4.352% 5/20/49 (d)		291,313		314,520
Domino's Pizza Master Issuer LLC Series 2019-1A, Class A2, 3.668% 10/25/49 (d)		247,500		262,153
Series 2018-1A, Class A2I, 4.116% 7/25/48 (d)		263,925		276,537
Series 2017-1A, Class A23, 4.118% 7/25/47 (d)		164,900		176,445
Series 2015-1A, Class A2II, 4.474% 10/25/45 (d)		593,650		627,735
Eaton Vance CLO Ltd., Series 2013-1A, Class BRR, 3 mo. USD LIBOR + 2.800% 3.037% FRN 1/15/28 (d)		250,000		250,027
Elara HGV Timeshare Issuer LLC Series 2016-A, Class A, 2.730% 4/25/28 (d)		97,956		97,548
Series 2016-A, Class B, 3.220% 4/25/28 (d)		59,729		58,948
Elmwood CLO II Ltd., Series 2019-2A, Class A, 3 mo. USD LIBOR + 1.450% 1.668% FRN 4/20/31 (d)		450,000		450,396
Elmwood CLO III Ltd., Series 2019-3A, Class A1, 3 mo. USD LIBOR + 1.370% 1.607% FRN 10/15/32 (d)		250,000		250,357
Falcon Aerospace Ltd., Series 2019-1, Class C 6.656% 9/15/39 (d)		318,930		202,299
FCI Funding LLC, Series 2019-1A, Class A 3.630% 2/18/31 (d)		39,611		40,226
Goldentree Loan Management US CLO Ltd., Series 2019-5A, Class C, 3 mo. USD LIBOR + 2.700% 2.918% FRN 10/20/32 (d)		250,000		250,499
Goodgreen Trust Series 2016-1A, Class A, 3.230% 10/15/52 (d)		235,104		242,202
Series 2017-1A, Class A, 3.740% 10/15/52 (d)		127,143		134,044
Series 2019-2A, Class B, 3.860% 10/15/54 (d)		146,505		152,911
Harbor Park CLO Ltd., Series 2018-1A, Class B1, 3 mo. USD LIBOR + 1.700% 1.918% FRN 1/20/31 (d)		280,000		280,013
Helios Issuer LLC, Series 2017-1A, Class A 4.940% 9/20/49 (d)		253,484		265,050
Hero Funding Trust Series 2016-3A, Class A1, 3.080% 9/20/42 (d)		103,783		106,523
Series 2017-3A, Class A1, 3.190% 9/20/48 (d)		133,872		137,891
Series 2017-2A, Class A1, 3.280% 9/20/48 (d)		51,989		53,721
Series 2016-4A, Class A2, 4.290% 9/20/47 (d)		104,336		110,575
Horizon Aircraft Finance I Ltd., Series 2018-1, Class B 5.270% 12/15/38 (d)		225,200		193,185
Horizon Aircraft Finance II Ltd., Series 2019-1, Class B 4.703% 7/15/39 (d)		273,167		234,251
Horizon Aircraft Finance III Ltd., Series 2019-2, Class A 3.425% 11/15/39 (d)		506,065		488,992
HPS Loan Management Ltd., Series 15A-19, Class C, 3 mo. USD LIBOR + 2.700% 2.916% FRN 7/22/32 (d)		250,000		250,291
ICG US CLO Ltd., Series 2019-1A, Class A1A, 3 mo. USD LIBOR + 1.380% 1.595% FRN 10/26/32 (d)		250,000		250,329
J.G. Wentworth XLIII LLC, Series 2019-1A, Class B 4.510% 8/15/73 (d)		138,000		151,279
Kayne CLO 4 Ltd., Series 2019-4A, Class B1, 3 mo. USD LIBOR + 2.100% 2.315% FRN 4/25/32 (d)		250,000		250,806
KDAC Aviation Finance Ltd., Series 2017-1A, Class A 4.212% 12/15/42 (d)		335,189		302,327

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Kestrel Aircraft Fundig Limited, Series 2018-1A, Class A 4.250% 12/15/38 (d)	$	374,596	$	346,935
KKR Financial CLO Ltd., Series 26, Class B1, 3 mo. USD LIBOR + 2.050% 2.287% FRN 7/15/32 (d)		250,000		250,269
KREF Ltd., Series 2018-FL1, Class D, 1 mo. USD LIBOR + 2.550% 2.703% FRN 6/15/36 (d)		450,000		439,024
Labrador Aviation Finance Ltd., Series 2016-1A, Class A1 4.300% 1/15/42 (d)		358,564		338,894
Lunar Aircraft Ltd. Series 2020-1A, Class A, 3.376% 2/15/45 (d)		212,802		200,979
Series 2020-1A, Class B, 4.335% 2/15/45 (d)		136,632		106,040
Series 2020-1A, Class C, 6.413% 2/15/45 (d)		205,079		91,007
MACH 1 Cayman Ltd., Series 2019-1, Class B 4.335% 10/15/39 (d)		323,872		279,965
Madison Park Funding Ltd., Series 2018-28A, Class B, 3 mo. USD LIBOR + 1.600% 1.837% FRN 7/15/30 (d)		950,000		944,639
Magnetite XV Ltd., Series 2015-15A, Class CR, 3 mo. USD LIBOR + 1.800% 2.015% FRN 7/25/31 (d)		490,000		482,021
Mosaic Solar Loans LLC, Series 2017-1A, Class A 4.450% 6/20/42 (d)		44,497		47,853
MP CLO III Ltd., Series 2013-1A, Class AR, 3 mo. USD LIBOR + 1.250% 1.468% FRN 10/20/30 (d)		250,000		249,089
NP SPE LLC, Series 2017-1A, Class A2 4.219% 10/21/47 (d)		380,000		403,418
Oak Street Investment Grade Net Lease Fund, Series 2020-1A, Class A5 3.390% 11/20/50 (d)		600,000		599,195
OHA Credit Funding Ltd. Series 2019-4A, Class A1, 3 mo. USD LIBOR + 1.330% 1.546% FRN 10/22/32 (d)		250,000		250,304
Series 2015-11A, Class CR, 3 mo. USD LIBOR + 2.150% 2.368% FRN 1/20/32 (d)		300,000		298,418
OneMain Financial Issuance Trust Series 2019-2A, Class A, 3.140% 10/14/36 (d)		1,700,000		1,835,067
Series 2020-2A, Class D, 3.450% 9/14/35 (d)		280,000		289,564
Series 2019-2A, Class C, 3.660% 10/14/36 (d)		400,000		412,915
Orange Lake Timeshare Trust, Series 2019-A, Class D 4.930% 4/09/38 (d)		519,647		501,837
Oxford Finance Funding Trust, Series 2020-1A, Class A2 3.101% 2/15/28 (d)		344,000		351,755
Park Place Securities, Inc., Series 2005-WCW3, Class M1, 1 mo. USD LIBOR + .720% 0.868% FRN 8/25/35		33,339		33,275
Pioneer Aircraft Finance Ltd., Series 2019-1, Class B 4.948% 6/15/44 (d)		341,661		275,205
Planet Fitness Master Issuer LLC, Series 2019-1A, Class A2 3.858% 12/05/49 (d)		503,910		488,083
PNMAC GMSR Issuer Trust, Series 2018-GT1, Class A, 1 mo. USD LIBOR + 2.850% 2.998% FRN 2/25/23 (d)		210,000		206,450
Popular ABS Mortgage Pass-Through Trust, Series 2006-B, Class A3, 1 mo. USD LIBOR + .560% 0.708% FRN 5/25/36		1,240		1,238
Rockford Tower CLO Ltd., Series 2018-1A, Class B, 3 mo. USD LIBOR + 1.720% 1.944% FRN 5/20/31 (d)		250,000		248,254
RR 3 Ltd., Series 2018-3A, Class A1R2, 3 mo. USD LIBOR + 1.090% 1.327% FRN 1/15/30 (d)		500,000		498,645

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
RR 6 Ltd., Series 2019-6A, Class A1A, 3 mo. USD LIBOR + 1.250% 1.487% FRN 4/15/30 (d)	$	250,000	$	250,005
Sierra Receivables Funding LLC Series 2020-2A, Class C, 3.510% 7/20/37 (d)		127,452		130,213
Series 2019-1A, Class D, 4.750% 1/20/36 (d)		336,698		338,983
Steele Creek CLO Ltd., Series 2018-2A, Class C, 3 mo. USD LIBOR + 2.300% 2.520% FRN 8/18/31 (d)		490,000		477,748
Store Master Funding I-VII and XIV Series 2019-1, Class A4, 4.490% 11/20/49 (d)		765,829		734,102
Series 2018-1A, Class A4, 4.740% 10/20/48 (d)		237,200		250,311
Sunnova Helios II Issuer LLC, Series 2018-1A, Class A 4.870% 7/20/48 (d)		114,438		122,504
SuttonPark Structured Settlements LLC, Series 2017-1A, Class A 4.190% 1/15/71 (d)		290,203		335,368
Taco Bell Funding LLC Series 2018-1A, Class A2II, 4.940% 11/25/48 (d)		303,800		334,047
Series 2016-1A, Class A23, 4.970% 5/25/46 (d)		424,600		453,552
Textainer Marine Containers VII Ltd., Series 2019-1A, Class B 5.280% 4/20/44 (d)		185,467		189,826
THL Credit Wind River CLO Ltd., Series 2018-3A, Class B, 3 mo. USD LIBOR + 1.700% 1.918% FRN 1/20/31 (d)		490,000		489,114
TICP CLO VI Ltd, Series 2016-6A, Class DR, 3 mo. USD LIBOR + 3.300% 3.537% FRN 1/15/29 (d)		350,000		349,828
TICP CLO XIV Ltd., Series 2019-14A, Class A2, 3 mo. USD LIBOR + 1.900% 2.118% FRN 10/20/32 (d)		250,000		250,261
Tif Funding II LLC, Series 2020-1A, Class A 2.090% 8/20/45 (d)		142,350		143,399
Trinity Rail Leasing LP Series 2019-2A, Class A2, 3.100% 10/18/49 (d)		700,000		730,396
Series 2018-1A, Class A2, 4.620% 6/17/48 (d)		430,000		452,328
Triton Container Finance VIII LLC, Series 2020-1A, Class A 2.110% 9/20/45 (d)		685,124		691,761
Vantage Data Centers LLC, Series 2020-2A, Class A2 1.992% 9/15/45 (d)		300,000		301,886
VSE VOI Mortgage LLC, Series 2016-A, Class B 2.740% 7/20/33 (d)		29,366		29,078
Wave USA 4.581% 9/15/44 (d)		608,521		502,963
Westgate Resorts LLC, Series 2017-1A, Class A 3.050% 12/20/30 (d)		61,069		61,729
Willis Engine Structured Trust III, Series 2017-A, Class A, 4.690% STEP 8/15/42 (d)		348,016		301,761
Willis Engine Structured Trust IV, Series 2018-A, Class A, 4.750% STEP 9/15/43 (d)		220,790		190,548
				34,193,738
Student Loans Asset-Backed Securities — 5.9%
Access Group, Inc., Series 2015-1, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 7/25/58 (d)		130,000		118,847
Brazos Higher Education Authority, Inc. 1.653% 6/25/42		450,000		445,558
College Avenue Student Loans LLC Series 2019-A, Class C, 4.460% 12/28/48 (d)		225,000		227,851
Series 2019-A, Class D, 5.500% 12/28/48 (d)		174,000		178,265

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Commonbond Student Loan Trust, Series 2017-AGS, Class C 5.280% 5/25/41 (d)	$	64,887	$	66,621
Credit Suisse ABS Repackaging Trust, Series 2013-A, Class B 2.500% 1/25/30 (d)		82,035		82,388
EdLinc Student Loan Funding Trust, Series 2017-A, Class A, PRIME - 1.150% 3.600% FRN 12/01/47 (d)		265,828		262,869
Goal Capital Funding Trust, Series 2006-1, Class B, 3 mo. USD LIBOR + .450% 0.657% FRN 8/25/42		607,063		527,815
KeyCorp Student Loan Trust, Series 1999-B, Class CTFS, 3 mo. USD LIBOR + .900% 1.107% FRN 11/25/36		5,040		5,036
Navient Private Education Refi Loan Trust Series 2020-DA, Class B, 3.330% 5/15/69 (d)		1,003,000		1,016,536
Series 2018-CA, Class B, 4.220% 6/16/42 (d)		530,000		553,757
Navient Student Loan Trust Series 2019-BA, Class A2B, 1 mo. USD LIBOR + .980% 1.139% FRN 12/15/59 (d)		1,000,000		998,182
Series 2018-1A, Class B, 1 mo. USD LIBOR + 1.200% 1.348% FRN 3/25/67 (d)		250,000		236,351
Series 2018-EA, Class B, 4.440% 12/15/59 (d)		140,000		146,143
Nelnet Private Education Loan Trust Series 2016-A, Class A1A, 1 mo. USD LIBOR + 1.750% 1.898% FRN 12/26/40 (d)		41,719		41,907
Series 2016-A, Class A1B, 3.600% 12/26/40 (d)		46,732		46,954
Nelnet Student Loan Trust Series 2006-3, Class B, 3 mo. USD LIBOR + .250% 0.501% FRN 6/25/41		117,266		101,316
Series 2012-2A, Class B, 1 mo. USD LIBOR + 1.000% 1.148% FRN 11/25/36 (d)		200,000		190,576
Series 2012-1A, Class B, 1 mo. USD LIBOR + 1.000% 1.148% FRN 6/25/42 (d)		150,000		136,041
Series 2012-4A, Class B, 1 mo. USD LIBOR + 1.000% 1.148% FRN 7/26/49 (d)		350,000		319,311
Series 2005-4, Class A4R2, 28 day ARS 1.191% FRN 3/22/32		145,411		139,766
Series 2018-5A, Class B, 1 mo. USD LIBOR + 1.450% 1.599% FRN 2/25/67 (d)		800,000		751,973
Series 2014-2A, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 6/25/41 (d)		100,000		94,917
Series 2014-1A, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 10/25/47 (d)		440,000		414,063
Series 2014-5A, Class B, 1 mo. USD LIBOR + 1.500% 1.648% FRN 5/26/54 (d)		100,000		95,279
SLM Student Loan Trust Series 2006-2, Class R, 0.000% 1/25/41		1,363		749,650
Series 2006-7, Class B, 3 mo. USD LIBOR + .200% 0.415% FRN 1/27/42		303,457		268,886
Series 2006-4, Class B, 3 mo. USD LIBOR + .200% 0.415% FRN 1/25/70		157,874		140,907
Series 2006-5, Class B, 3 mo. USD LIBOR + .210% 0.425% FRN 10/25/40		131,040		117,144
Series 2005-6, Class B, 3 mo. USD LIBOR + .290% 0.505% FRN 1/25/44		315,978		281,822
Series 2005-9, Class B, 3 mo. USD LIBOR + .300% 0.515% FRN 1/25/41		393,981		365,443
Series 2004-3, Class B, 3 mo. USD LIBOR + .470% 0.685% FRN 10/25/64		106,008		98,610
Series 2003-14, Class A7, 3 mo. USD LIBOR + .600% 0.815% FRN 10/25/65 (d)		910,000		902,111
SMB Private Education Loan Trust Series 2019-A, Class B, 4.000% 11/17/42 (d)		185,000		191,455
Series 2015-C, Class C, 4.500% 9/17/46 (d)		350,000		373,238
SoFi Professional Loan Program LLC Series 2018-A, Class R1, 0.000% 2/25/42 (d)		1,000,000		369,874

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2019-A, Class R1, 0.000% 6/15/48 (d)	$	1,361,200	$	293,202
Series 2017-D, Class R1, 0.000% 9/25/40 (d)		1,000,000		289,460
Series 2018-D, Class R1, 0.000% 2/25/48 (d)		911,500		201,533
Series 2017-D, Class BFX, 3.610% 9/25/40 (d)		500,000		512,203
Series 2017-C, Class C, 4.210% VRN 7/25/40 (d) (f)		180,000		189,162
Series 2017-A, Class C, 4.430% VRN 3/26/40 (d) (f)		170,000		177,609
South Carolina Student Loan Corp. Series 2015-A, Class A, 1 mo. USD LIBOR + 1.500% 1.648% FRN 1/25/36		82,985		83,357
Series 2014-1, Class B, 1 mo. USD LIBOR + 1.500% 1.655% FRN 8/01/35		550,000		528,459
				13,332,447
Whole Loan Collateral Collateralized Mortgage Obligations — 0.9%
Angel Oak Mortgage Trust I LLC
Series 2019-4, Class M1, 3.459% VRN 7/26/49 (d) (f)		492,000		500,073
Series 2019-2, Class M1, 4.065% VRN 3/25/49 (d) (f)		260,000		267,726
Bank of America Mortgage Securities, Series 2004-G, Class 2A7, 3.076% VRN 8/25/34 (f)		12,142		11,902
Deephaven Residential Mortgage Trust Series 2019-3A, Class M1, 3.405% VRN 7/25/59 (d) (f)		800,000		809,633
Series 2019-1A, Class M1, 4.402% VRN 1/25/59 (d) (f)		250,000		253,929
JP Morgan Mortgage Trust, Series 2017-1, Class A11, 3.500% VRN 1/25/47 (d) (f)		235,863		241,038
				2,084,301
TOTAL NON-U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $72,117,561)				70,370,240
Sovereign Debt Obligations — 0.7%
Colombia Government International Bond 6.125% 1/18/41		440,000		589,600
Mexico Government International Bond 4.750% 3/08/44		414,000		491,629
6.750% 9/27/34		375,000		528,285
				1,609,514
TOTAL SOVEREIGN DEBT OBLIGATIONS (Cost $1,430,910)				1,609,514
U.S. Government Agency Obligations and Instrumentalities — 15.4%
Collateralized Mortgage Obligations — 0.0%
Federal Home Loan Mortgage Corp.  Series 2178, Class PB 7.000% 8/15/29		6,644		7,542
Pass-Through Securities — 14.6%
Federal Home Loan Mortgage Corp. Pool #RA4245 2.000% 12/01/50		575,000		599,218
Pool #RA4255 2.000% 1/01/51		1,200,000		1,253,542
Federal National Mortgage Association Pool #MA3029 3.000% 6/01/32		539,851		570,022
Pool #MA3090 3.000% 8/01/32		225,934		238,561
Pool #AR3007 3.000% 2/01/43		140,669		150,260
Pool #AS1304 3.500% 12/01/28		134,142		143,758
Pool #MA1356 3.500% 2/01/43		909,441		992,264
Pool #CA6096 3.500% 6/01/50		2,060,482		2,218,511
Pool #FM4017 3.500% 8/01/50		194,363		205,565

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Pool #CA1909 4.500% 6/01/48	$	871,628	$	947,520
Pool #AD6437 5.000% 6/01/40		48,733		56,192
Pool #AD6996 5.000% 7/01/40		311,667		359,370
Pool #AL8173 5.000% 2/01/44		128,814		148,248
Government National Mortgage Association Pool #581417 7.000% 7/15/32		658		749
Government National Mortgage Association I Pool #579140 6.500% 1/15/32		564		651
Pool #587280 6.500% 9/15/32		862		979
Pool #550659 6.500% 9/15/35		63,649		75,130
Pool #538689 6.500% 12/15/35		12,693		15,119
Pool #780651 7.000% 10/15/27		623		694
Pool #462384 7.000% 11/15/27		372		415
Pool #482668 7.000% 8/15/28		746		843
Pool #423836 8.000% 8/15/26		463		515
Pool #444619 8.000% 3/15/27		4,263		4,746
Government National Mortgage Association II Pool# MA6656 3.000% 5/20/50		2,236,402		2,339,133
Pool# MA6710 3.000% 6/20/50		2,260,434		2,370,097
Pool #MA4321 3.500% 3/20/47		1,362,399		1,466,629
Government National Mortgage Association II TBA 3.000% 8/01/49 (g)		3,425,000		3,581,533
3.500% 6/01/49 (g)		780,000		826,678
Uniform Mortgage Backed Securities TBA 2.000% 6/01/35 (g)		7,250,000		7,581,914
3.000% 7/01/49 (g)		6,600,000		6,915,563
				33,064,419
Whole Loans — 0.8%
Federal Home Loan Mortgage Corp. Structured Agency Credit Risk Debt Notes Series 2020-DNA6, Class M2, SOFR30A + 2.000% 2.077% FRN 12/25/50 (d)		1,000,000		998,962
Series 2019-DNA3, Class M2, 1 mo. USD LIBOR + 2.050% 2.198% FRN 7/25/49 (d)		285,628		283,450
Federal National Mortgage Association Connecticut Avenue Securities Trust Series 2019-R04, Class 2M2, 1 mo. USD LIBOR + 2.100% 2.248% FRN 6/25/39 (d)		119,928		119,547
Series 2019-R03, Class 1M2, 1 mo. USD LIBOR + 2.150% 2.298% FRN 9/25/31 (d)		87,281		86,986
Series 2019-R02, Class 1M2, 1 mo. USD LIBOR + 2.300% 2.448% FRN 8/25/31 (d)		285,030		284,113
				1,773,058
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES   (Cost $34,591,979)				34,845,019
U.S. Treasury Obligations — 2.2%
U.S. Treasury Bonds & Notes — 2.2%
U.S. Treasury Bond 2.250% 8/15/49 (h)		2,020,000		2,313,346
3.500% 2/15/39		1,200,000		1,628,664
U.S. Treasury Note 0.250% 10/31/25		500,000		497,811

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
1.625% 8/15/29	$	500,000	$	534,877
				4,974,698
TOTAL U.S. TREASURY OBLIGATIONS (Cost $5,061,239)				4,974,698
TOTAL BONDS & NOTES (Cost $208,145,152)				215,544,281
TOTAL PURCHASED OPTIONS (#) — 0.2% (Cost $710,400)				474,682

	Number of Shares
Warrants — 0.0%
Consumer, Non-cyclical — 0.0%
Chemicals — 0.0%
Hercules LLC, Expires 3/31/29, Strike 0.09 (a) (b) (c)		150	3,896
TOTAL WARRANTS (Cost $0)			3,896
TOTAL LONG-TERM INVESTMENTS (Cost $209,418,405)			216,569,819

	Principal Amount
Short-Term Investments — 11.6%
Commercial Paper — 10.6%
American Honda Finance Corp. 0.243% 2/08/21	$	3,000,000	2,998,983
Centerpoint Energy, Inc. 0.213% 1/06/21 (d)		1,000,000	999,981
Intercontinental Exchange, Inc. 0.274% 2/02/21 (b) (d)		2,000,000	1,999,378
National Grid Holdings 0.304% 2/18/21 (d)		2,000,000	1,999,333
NiSource, Inc. 0.254% 1/14/21 (d)		1,000,000	999,935
Public Service Enterprise Group, Inc. 0.284% 2/23/21 (d)		3,000,000	2,998,866
Suncor Energy, Inc. 0.325% 3/03/21 (d)		3,000,000	2,998,651
Telus Corp. 0.162% 2/04/21 (d)		3,000,000	2,999,338
Transcanada Pipelines Ltd. 0.304% 1/14/21 (d)		2,000,000	1,999,870
Vodafone Group PLC 0.325% 1/07/21 (d)		2,000,000	1,999,942
Walgreens Boots Alliance, Inc. 0.304% 2/19/21 (d)		2,000,000	1,999,075
			23,993,352

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Repurchase Agreement — 1.0%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (i)	$	2,353,837	$	2,353,837
TOTAL SHORT-TERM INVESTMENTS (Cost $26,347,221)				26,347,189
TOTAL INVESTMENTS — 107.2% (Cost $235,765,626) (j)				242,917,008
Other Assets/(Liabilities) — (7.2)%				(16,407,011	)
NET ASSETS — 100.0%			$	226,509,997

Abbreviation Legend

ARS	Auction Rate Security
CLO	Collateralized Loan Obligation
FRN	Floating Rate Note
STEP	Step Up Bond
TBA	To Be Announced
VRN	Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a)	Non-income producing security.
(b)	This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At December 31, 2020, these securities amounted to a value of $2,063,796 or 0.91% of net assets.
(c)	Investment was valued using significant unobservable inputs.
(d)	Security is exempt from registration under Regulation S or Rule 144A of the Securities Act of 1933. These securities are considered restricted and may be resold in transactions exempt from registration. At December 31, 2020, the aggregate market value of these securities amounted to $118,345,353 or 52.25% of net assets.
(e)	Security is perpetual and has no stated maturity date.
(f)	Certain variable rate securities are not based on a published reference rate and spread but are determined by the issuer or agent and are based on current market conditions. These securities do not indicate a reference rate and spread in their description above. The rates shown are the current interest rates at December 31, 2020.
(g)	A portion of this security is purchased on a when-issued, delayed-delivery or forward commitment basis.
(h)	A portion of this security is pledged/held as collateral for open derivatives.
(i)	Maturity value of $2,353,837. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $2,401,004.
(j)	See Note 3 for aggregate cost for federal tax purposes.

(#) Interest Rate Swaptions Purchased

			Paid by Fund			Received by Fund
Description	Counterparty	Expiration Date	Rate	Frequency		Rate	Frequency	Notional Amount		Value		Premium Paid (Received)		Unrealized Appreciation/ (Depreciation)
Call
10-Year Interest Rate Swap, 12/15/42	Barclays Bank PLC	12/13/32	3-Month USD LIBOR BBA	Quarterly		2.44%	Semi-Annually	USD	800,000	$	80,160	$	39,994	$	40,166
Put
10-Year Interest Rate Swap, 12/15/42	Barclays Bank PLC	12/13/32	2.94%	Semi-Annually	3-Month USD LIBOR BBA		Quarterly	USD	13,410,000	$	394,522	$	670,406	$	(275,884	)
										$	474,682	$	710,400	$	(235,718	)

MassMutual Premier Diversified Bond Fund — Portfolio of Investments (Continued)

Forward contracts
Counterparty	Settlement Date	Currency Purchased		Currency Sold		Unrealized Appreciation (Depreciation)
Bank of America N.A.	1/19/21	PLN	1,978,257	USD	519,678	$	9,936
Bank of America N.A.	1/19/21	USD	255,000	ILS	838,835		(6,105	)
Bank of America N.A.	1/26/21	USD	258,000	JPY	27,151,713		(5,027	)
Bank of America N.A.	1/27/21	AUD	205,527	USD	147,586		10,906
Bank of America N.A.	2/09/21	MXN	3,132,174	USD	147,063		9,715
Bank of America N.A.	2/16/21	RUB	11,400,466	USD	154,000		(387	)
Bank of America N.A.	2/16/21	USD	151,024	CHF	137,732		(4,750	)
Bank of America N.A.	2/16/21	USD	261,097	EUR	220,889		(9,018	)
Citibank N.A.	1/12/21	USD	257,000	MXN	5,170,914		(2,627	)
Citibank N.A.	1/19/21	ZAR	4,292,379	USD	254,973		36,497
Citibank N.A.	2/09/21	BRL	2,481,400	USD	436,022		41,463
Citibank N.A.	2/09/21	COP	378,071,800	USD	106,978		3,703
Citibank N.A.	2/09/21	USD	103,000	COP	378,071,800		(7,681	)
Citibank N.A.	2/23/21	INR	19,264,410	USD	258,875		3,392
Citibank N.A.	2/23/21	USD	266,413	SGD	357,261		(3,922	)
Goldman Sachs International	1/12/21	MXN	8,301,451	USD	365,637		51,171
Goldman Sachs International	1/19/21	USD	101,937	RUB	8,043,965		(6,752	)
HSBC Bank USA	1/19/21	USD	271,866	ZAR	4,292,379		(19,604	)
HSBC Bank USA	2/16/21	USD	255,836	ILS	862,230		(12,683	)
JP Morgan Chase Bank	1/12/21	BRL	892,344	USD	157,089		14,737
JP Morgan Chase Bank	1/19/21	USD	108,995	CHF	99,609		(3,570	)
JP Morgan Chase Bank	2/08/21	PKR	6,105,433	USD	38,016		(47	)
JP Morgan Chase Bank	2/18/21	PKR	6,105,433	USD	37,969		(85	)
Morgan Stanley & Co. LLC	1/19/21	RUB	15,797,600	USD	208,000		5,456
Morgan Stanley & Co. LLC	2/16/21	EUR	226,169	USD	274,000		2,571
Morgan Stanley & Co. LLC	2/16/21	USD	6,000	EUR	4,953		(57	)
Morgan Stanley & Co. LLC	2/23/21	AUD	233,701	USD	170,940		9,313
						$	116,545

Futures contracts

	Expiration Date	Number of Contracts		Notional Amount			Value/ Net Unrealized Appreciation/ (Depreciation)
Long
U.S. Treasury Long Bond	3/22/21		25	$	4,353,226		$	(23,538	)
U.S. Treasury Ultra Bond	3/22/21		64		13,923,952			(255,952	)
U.S. Treasury Note 2 Year	3/31/21		122		26,930,923			28,218
U.S. Treasury Note 5 Year	3/31/21		35		4,405,133			10,609
							$	(240,663	)
Short
90 Day Eurodollar	3/15/21		2	$	(487,743	)	$	(11,407	)
U.S. Treasury Ultra 10 Year	3/22/21		27		(4,241,194	)		19,491
90 Day Eurodollar	9/13/21		3		(731,728	)		(16,997	)
90 Day Eurodollar	3/14/22		3		(731,503	)		(17,147	)
90 Day Eurodollar	9/19/22		3		(731,203	)		(17,260	)
90 Day Eurodollar	3/13/23		2		(487,168	)		(11,557	)
90 Day Eurodollar	12/18/23		3		(730,078	)		(16,285	)
90 Day Eurodollar	12/16/24		6		(1,458,354	)		(30,396	)
							$	(101,558	)

Currency Legend

AUD	Australian Dollar
BRL	Brazilian Real
CHF	Swiss Franc
COP	Colombian Peso
EUR	Euro
ILS	Israeli Shekel
INR	Indian Rupee
JPY	Japanese Yen
MXN	Mexican Peso
PKR	Pakistan Rupee
PLN	Polish Zloty
RUB	Russian Ruble
SGD	Singapore Dollar
USD	U.S. Dollar
ZAR	South African Rand

MassMutual Premier High Yield Fund — Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 0.3%
Common Stock — 0.3%
Basic Materials — 0.0%
Forest Products & Paper — 0.0%
The Newark Group, Inc. (a) (b)		329,969	$	9,899
Energy — 0.3%
Oil & Gas — 0.3%
Fieldwood Energy LLC (b)		10,960		—
Fieldwood Energy LLC (b)		44,668		—
Jupiter Resources, Inc. (a) (b) (c)		610,239		1,952,765
				1,952,765
TOTAL COMMON STOCK (Cost $4,333,621)				1,962,664
TOTAL EQUITIES (Cost $4,333,621)				1,962,664

	Principal Amount
Bonds & Notes — 97.4%
Bank Loans — 5.7%
Advertising — 0.4%
Clear Channel Outdoor Holdings, Inc., Term Loan B, 3 mo. LIBOR + 3.500% 3.714% VRN 8/21/26	$	2,821,856	2,710,985
Entertainment — 0.2%
Delta 2 (LUX) S.A.R.L., 2018 USD Term Loan, 1 mo. LIBOR + 2.500% 3.500% VRN 2/01/24		1,559,709	1,540,774
Health Care – Services — 0.5%
Radiology Partners, Inc., 2018 1st Lien Term Loan B, 0.000% 7/09/25 (d)		2,829,000	2,777,739
Household Products & Wares — 0.4%
Kronos Acquisition Holdings, Inc., 2020 Term Loan B, 0.000% 12/17/26 (d)		2,537,853	2,534,681
Oil & Gas — 0.0%
Fieldwood Energy LLC, Exit 2nd Lien Term Loan, 0.000% 4/11/23 (e)		3,084,695	709
Packaging & Containers — 1.3%
BWAY Holding Co., 2017 Term Loan B, 3 mo. LIBOR + 3.250% 3.480% VRN 4/03/24		4,549,848	4,384,916
Consolidated Energy Finance, SA, Term Loan B, 1 mo. LIBOR + 2.500% 2.645% VRN 5/07/25		3,126,560	2,981,957

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Trident TPI Holdings, Inc., 2017 USD Term Loan B1, 3 mo. LIBOR + 3.000% 4.000% VRN 10/17/24	$	672,107	$	662,173
				8,029,046
Software — 2.9%
Banff Merger Sub, Inc., 2018 USD Term Loan B, 1 mo. LIBOR + 4.250% 4.397% VRN 10/02/25		2,861,515		2,846,377
Finastra USA, Inc. USD 1st Lien Term Loan, 6 mo. LIBOR + 3.500%
4.500% VRN 6/13/24		8,929,187		8,736,674
USD 2nd Lien Term Loan, 6 mo. LIBOR + 7.250% 8.250% VRN 6/13/25		6,000,000		6,002,160
				17,585,211
TOTAL BANK LOANS (Cost $37,548,083)				35,179,145
Corporate Debt — 91.7%
Advertising — 0.7%
Clear Channel International BV 6.625% 8/01/25 (f)		1,570,000		1,656,350
Terrier Media Buyer, Inc. 8.875% 12/15/27 (f)		2,561,000		2,823,503
				4,479,853
Aerospace & Defense — 2.5%
Rolls-Royce PLC 5.750% 10/15/27 (f)		1,151,000		1,274,733
Signature Aviation US Holdings, Inc. 4.000% 3/01/28 (f)		2,864,000		2,883,046
TransDigm, Inc. 6.250% 3/15/26 (f)		1,250,000		1,331,250
6.375% 6/15/26		1,510,000		1,562,850
8.000% 12/15/25 (f)		1,076,000		1,189,303
Triumph Group, Inc. 5.250% 6/01/22		1,825,000		1,738,312
6.250% 9/15/24 (f)		1,347,000		1,333,530
7.750% 8/15/25		4,319,000		3,946,486
				15,259,510
Agriculture — 0.3%
JBS Investments II GmbH 7.000% 1/15/26 (f)		1,574,000		1,699,448
Airlines — 1.1%
American Airlines, Inc. 11.750% 7/15/25 (f)		1,962,000		2,262,676
Delta Air Lines, Inc./SkyMiles IP Ltd. 4.500% 10/20/25 (f)		1,085,000		1,159,712
4.750% 10/20/28 (f)		1,998,000		2,180,842
Mileage Plus Holdings LLC / Mileage Plus Intellectual Property Assets Ltd. 6.500% 6/20/27 (f)		1,137,000		1,222,275
				6,825,505

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Auto Manufacturers — 4.1%
Ford Motor Co. 7.450% 7/16/31	$	3,209,000	$	4,115,543
8.500% 4/21/23		1,325,000		1,491,301
9.000% 4/22/25		1,029,000		1,261,564
9.625% 4/22/30		3,100,000		4,374,875
Ford Motor Credit Co. LLC
3.087% 1/09/23		650,000		661,339
3.375% 11/13/25		1,000,000		1,027,360
3.664% 9/08/24		646,000		662,958
4.000% 11/13/30		1,000,000		1,050,000
4.125% 8/17/27		1,335,000		1,398,413
4.134% 8/04/25		771,000		808,586
4.140% 2/15/23		342,000		352,260
4.389% 1/08/26		712,000		747,372
4.687% 6/09/25		1,000,000		1,066,250
5.113% 5/03/29		322,000		358,611
5.125% 6/16/25		1,236,000		1,343,903
5.596% 1/07/22		396,000		409,337
5.875% 8/02/21		1,796,000		1,838,206
JB Poindexter & Co., Inc. 7.125% 4/15/26 (f)		2,198,000		2,324,385
				25,292,263
Auto Parts & Equipment — 0.8%
Adient Global Holdings Ltd. 4.875% 8/15/26 (f)		762,000		782,955
Adient US LLC 9.000% 4/15/25 (f)		466,000		519,590
American Axle & Manufacturing, Inc. 6.500% 4/01/27		1,064,000		1,119,860
Clarios Global LP 6.750% 5/15/25 (f)		452,000		487,030
Clarios Global LP/Clarios US Finance Co. 8.500% 5/15/27 (f)		1,946,000		2,114,153
				5,023,588
Building Materials — 2.1%
Cornerstone Building Brands, Inc. 6.125% 1/15/29 (f)		1,575,000		1,673,438
CP Atlas Buyer, Inc. 7.000% 12/01/28 (f)		2,399,000		2,494,960
Forterra Finance LLC / FRTA Finance Corp. 6.500% 7/15/25 (f)		640,000		688,000
Griffon Corp. 5.750% 3/01/28		1,258,000		1,330,335
James Hardie International Finance DAC 4.750% 1/15/25 (f)		1,027,000		1,044,675
5.000% 1/15/28 (f)		731,000		776,446
PGT Innovations, Inc. 6.750% 8/01/26 (f)		1,279,000		1,360,536
Standard Industries, Inc.
4.750% 1/15/28 (f)		2,619,000		2,756,497

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Summit Materials LLC / Summit Materials Finance Corp. 5.250% 1/15/29 (f)	$	836,000	$	877,800
				13,002,687
Chemicals — 1.5%
CF Industries, Inc. 4.950% 6/01/43		266,000		326,515
5.375% 3/15/44		1,040,000		1,316,385
Consolidated Energy Finance SA 6.875% 6/15/25 (f)		4,286,000		4,344,932
Ingevity Corp. 3.875% 11/01/28 (f)		1,032,000		1,039,740
Kraton Polymers LLC / Kraton Polymers Capital Corp. 4.250% 12/15/25 (f)		605,000		617,161
Nouryon Holding BV 8.000% 10/01/26 (f)		604,000		641,750
Valvoline, Inc. 4.375% 8/15/25		653,000		674,399
				8,960,882
Coal — 2.0%
Peabody Energy Corp. 6.000% 3/31/22 (f)		7,862,000		5,739,260
SunCoke Energy Partners LP/SunCoke Energy Partners Finance Corp. 7.500% 6/15/25 (f)		3,168,000		3,144,874
Warrior Met Coal, Inc. 8.000% 11/01/24 (f)		2,960,000		3,026,600
				11,910,734
Commercial Services — 1.0%
Prime Security Services Borrower LLC / Prime Finance, Inc. 6.250% 1/15/28 (f)		3,925,000		4,213,841
Sabre GLBL, Inc. 9.250% 4/15/25 (f)		306,000		364,140
Shift4 Payments LLC / Shift4 Payments Finance Sub, Inc. 4.625% 11/01/26 (f)		631,000		656,240
TMS International Holding Corp. 7.250% 8/15/25 (f)		1,046,000		1,061,690
				6,295,911
Computers — 2.1%
Austin BidCo, Inc. 7.125% 12/15/28 (f)		574,000		599,112
Banff Merger Sub, Inc. 9.750% 9/01/26 (f)		4,005,000		4,326,001
Dell International LLC/EMC Corp. 7.125% 6/15/24 (f)		3,673,000		3,809,360
Diebold Nixdorf, Inc. 9.375% 7/15/25 (f)		3,050,000		3,416,000
Presidio Holdings, Inc. 8.250% 2/01/28 (f)		442,000		487,305
				12,637,778

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Distribution & Wholesale — 1.5%
Core & Main Holdings LP 8.625% 9/15/24 (f)	$	657,000	$	671,783
Core & Main LP 6.125% 8/15/25 (f)		1,330,000		1,374,887
KAR Auction Services, Inc. 5.125% 6/01/25 (f)		2,548,000		2,621,968
Resideo Funding, Inc. 6.125% 11/01/26 (f)		4,000,000		4,210,000
				8,878,638
Diversified Financial Services — 3.3%
Alliance Data Systems Corp. 4.750% 12/15/24 (f)		3,554,000		3,589,540
7.000% 1/15/26 (f)		1,069,000		1,130,788
Global Aircraft Leasing Co. Ltd. 6.500% 9/15/24 (f)		6,475,500		5,779,384
LPL Holdings, Inc. 4.625% 11/15/27 (f)		1,425,000		1,474,875
5.750% 9/15/25 (f)		4,383,000		4,533,863
OneMain Finance Corp. 4.000% 9/15/30		1,047,000		1,086,377
5.375% 11/15/29		2,393,000		2,692,125
				20,286,952
Electric — 1.7%
FirstEnergy Corp. 2.250% 9/01/30		898,000		868,638
4.850% STEP 7/15/47		2,101,000		2,614,684
7.375% 11/15/31		275,000		392,140
PG&E Corp. 5.000% 7/01/28		3,549,000		3,779,685
5.250% 7/01/30		501,000		551,100
Pike Corp. 5.500% 9/01/28 (f)		2,046,000		2,161,088
				10,367,335
Electrical Components & Equipment — 0.4%
WESCO Distribution, Inc. Co. 7.125% 6/15/25 (f)		1,013,000		1,114,128
7.250% 6/15/28 (f)		1,046,000		1,189,605
				2,303,733
Engineering & Construction — 0.2%
New Enterprise Stone & Lime Co., Inc. 9.750% 7/15/28 (f)		1,374,000		1,504,530
Entertainment — 2.6%
Banijay Entertainment SASU 5.375% 3/01/25 (f)		1,083,000		1,122,524
Boyne USA, Inc. 7.250% 5/01/25 (f)		632,000		662,810
Caesars Entertainment, Inc. 6.250% 7/01/25 (f)		1,847,000		1,967,055
8.125% 7/01/27 (f)		1,888,000		2,090,058

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Caesars Resort Collection LLC/CRC Finco, Inc. 5.250% 10/15/25 (f)	$	1,123,000	$	1,134,893
5.750% 7/01/25 (f)		1,035,000		1,096,663
CCM Merger, Inc. 6.375% 5/01/26 (f)		1,005,000		1,055,250
Cinemark USA, Inc. 5.125% 12/15/22		1,318,000		1,291,640
Live Nation Entertainment, Inc. 4.750% 10/15/27 (f)		2,788,000		2,857,477
Scientific Games International, Inc. 5.000% 10/15/25 (f)		873,000		900,840
7.250% 11/15/29 (f)		800,000		878,000
8.250% 3/15/26 (f)		160,000		172,416
8.625% 7/01/25 (f)		627,000		686,565
				15,916,191
Foods — 3.6%
JBS USA LUX SA/JBS USA Finance, Inc. 5.750% 6/15/25 (f)		1,329,000		1,372,193
6.750% 2/15/28 (f)		2,816,000		3,163,776
JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc. 5.500% 1/15/30 (f)		3,745,000		4,302,106
6.500% 4/15/29 (f)		4,969,000		5,784,413
Kraft Heinz Foods Co. 4.625% 1/30/29		2,213,000		2,532,196
5.200% 7/15/45		830,000		986,915
6.500% 2/09/40		2,000,000		2,703,418
6.875% 1/26/39		434,000		601,375
Simmons Foods, Inc. 7.750% 1/15/24 (f)		555,000		577,894
				22,024,286
Forest Products & Paper — 0.2%
Clearwater Paper Corp. 4.750% 8/15/28 (f)		1,055,000		1,091,925
Hand & Machine Tools — 0.5%
Apex Tool Group LLC/BC Mountain Finance, Inc. 9.000% 2/15/23 (f)		3,171,000		3,107,580
Health Care – Services — 2.7%
Centene Corp. 4.250% 12/15/27		985,000		1,044,100
4.625% 12/15/29		3,765,000		4,179,941
5.375% 6/01/26 (f)		226,000		238,364
CHS/Community Health Systems, Inc. 5.625% 3/15/27 (f)		485,000		521,496
6.000% 1/15/29 (f)		241,000		260,343
Molina Healthcare, Inc. 3.875% 11/15/30 (f)		857,000		919,133
4.375% 6/15/28 (f)		860,000		905,150
Radiology Partners, Inc. 9.250% 2/01/28 (f)		1,333,000		1,496,292
RP Escrow Issuer LLC 5.250% 12/15/25 (f)		1,166,000		1,218,540
Tenet Healthcare Corp. 4.625% 9/01/24 (f)		806,000		832,195

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
4.875% 1/01/26 (f)	$	2,600,000	$	2,719,886
5.125% 11/01/27 (f)		392,000		415,030
6.125% 10/01/28 (f)		1,400,000		1,458,772
				16,209,242
Home Builders — 2.2%
Brookfield Residential Properties, Inc. 6.375% 5/15/25 (f)		827,000		850,776
Brookfield Residential Properties, Inc. / Brookfield Residential US Corp. 4.875% 2/15/30 (f)		1,165,000		1,204,319
Empire Communities Corp. 7.000% 12/15/25 (f)		765,000		806,203
M/I Homes, Inc. 4.950% 2/01/28		1,544,000		1,634,401
5.625% 8/01/25		1,629,000		1,694,160
Mattamy Group Corp. 4.625% 3/01/30 (f)		4,214,000		4,466,840
STL Holding Co. LLC 7.500% 2/15/26 (f)		2,000,000		2,070,000
TRI Pointe Group, Inc. 5.700% 6/15/28		649,000		732,721
				13,459,420
Household Products & Wares — 0.2%
Kronos Acquisition Holdings, Inc. / KIK Custom Products, Inc. 7.000% 12/31/27 (f)		1,110,000		1,162,192
Insurance — 1.3%
Acrisure LLC/Acrisure Finance, Inc. 7.000% 11/15/25 (f)		3,199,000		3,330,319
8.125% 2/15/24 (f)		448,000		474,304
Amwins Group, Inc. 7.750% 7/01/26 (f)		1,145,000		1,229,616
AssuredPartners, Inc. 5.625% 1/15/29 (f)		1,127,000		1,176,306
Highlands Holdings Bond Issuer Ltd. / Highlands Holdings Bond Co-Issuer, Inc. 7.625% 10/15/25 (f)		1,471,000		1,570,293
				7,780,838
Internet — 1.5%
Netflix, Inc. 4.875% 6/15/30 (f)		1,353,000		1,555,950
5.375% 11/15/29 (f)		2,115,000		2,493,056
5.875% 11/15/28		1,961,000		2,350,749
Northwest Fiber LLC / Northwest Fiber Finance Sub, Inc. 10.750% 6/01/28 (f)		845,000		963,300
Uber Technologies, Inc. 6.250% 1/15/28 (f)		1,640,000		1,783,500
				9,146,555
Investment Companies — 1.6%
Icahn Enterprises LP/Icahn Enterprises Finance Corp. 4.750% 9/15/24		1,388,000		1,441,785
5.250% 5/15/27		2,581,000		2,766,832
6.250% 5/15/26		1,000,000		1,058,900

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
6.375% 12/15/25	$	4,385,000	$	4,536,282
				9,803,799
Iron & Steel — 0.7%
Big River Steel LLC / BRS Finance Corp. 6.625% 1/31/29 (f)		1,180,000		1,274,400
Cleveland-Cliffs, Inc. 6.750% 3/15/26 (f)		3,026,000		3,268,080
				4,542,480
Leisure Time — 0.9%
Carlson Travel, Inc. 6.750% 12/15/25 (f)		1,198,000		986,853
11.500% 12/15/26 (f)		3,127,683		1,696,768
Carnival Corp. 7.625% 3/01/26 (f)		566,000		616,651
NCL Corp. Ltd. 5.875% 3/15/26 (f)		2,196,000		2,309,797
				5,610,069
Lodging — 1.5%
Wyndham Destinations, Inc. 6.625% 7/31/26 (f)		1,980,000		2,267,100
Wyndham Hotels & Resorts, Inc. 4.375% 8/15/28 (f)		854,000		887,349
Wynn Las Vegas LLC/Wynn Las Vegas Capital Corp.  5.250% 5/15/27 (f)		1,195,000		1,231,746
5.500% 3/01/25 (f)		3,361,000		3,508,044
Wynn Macau Ltd. 5.125% 12/15/29 (f)		1,114,000		1,137,672
				9,031,911
Machinery – Diversified — 0.6%
Clark Equipment Co. 5.875% 6/01/25 (f)		1,412,000		1,489,660
GrafTech Finance, Inc. 4.625% 12/15/28 (f)		1,516,000		1,533,055
Welbilt, Inc. 9.500% 2/15/24		655,000		676,969
				3,699,684
Media — 7.6%
Altice Financing SA 5.000% 1/15/28 (f)		1,325,000		1,357,641
7.500% 5/15/26 (f)		3,289,000		3,470,882
Block Communications, Inc. 4.875% 3/01/28 (f)		1,516,000		1,561,480
CCO Holdings LLC/CCO Holdings Capital Corp. 4.500% 8/15/30 (f)		3,525,000		3,740,906
4.500% 5/01/32 (f)		223,000		238,101
4.750% 3/01/30 (f)		486,000		524,394
5.125% 5/01/27 (f)		872,000		925,358
5.375% 6/01/29 (f)		2,500,000		2,740,625
Clear Channel Worldwide Holdings, Inc. 5.125% 8/15/27 (f)		1,398,000		1,411,980

MassMutual Premier High Yield Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
9.250% 2/15/24	$	2,497,000	$	2,528,212
CSC Holdings LLC 3.375% 2/15/31 (f)		2,827,000		2,773,994
7.500% 4/01/28 (f)		2,001,000		2,251,125
DISH DBS Corp. 5.000% 3/15/23		902,000		931,315
DISH Network Corp. 3.375% 8/15/26		2,964,000		2,825,379
iHeartCommunications, Inc. 8.375% 5/01/27		2,677,000		2,857,590
LCPR Senior Secured Financing DAC 6.750% 10/15/27 (f)		1,343,000		1,445,404
Midcontinent Communications / Midcontinent Finance Corp. 5.375% 8/15/27 (f)		930,000		971,850
Nexstar Broadcasting, Inc. 4.750% 11/01/28 (f)		596,000		623,565
Radiate Holdco LLC / Radiate Finance, Inc. 6.500% 9/15/28 (f)		2,620,000		2,760,825
Sirius XM Radio, Inc. 5.375% 7/15/26 (f)		2,668,000		2,781,390
Townsquare Media, Inc. 6.500% 4/01/23 (f)		562,000		571,891
Virgin Media Finance PLC 5.000% 7/15/30 (f)		626,000		649,475
Virgin Media Secured Finance PLC 5.500% 5/15/29 (f)		4,137,000		4,483,474
Ziggo BV 4.875% 1/15/30 (f)		656,000		689,620
5.500% 1/15/27 (f)		1,449,000		1,512,394
				46,628,870
Mining — 3.6%
Arconic Corp. 6.125% 2/15/28 (f)		455,000		490,547
Compass Minerals International, Inc. 4.875% 7/15/24 (f)		1,040,000		1,079,000
6.750% 12/01/27 (f)		1,018,000		1,101,985
First Quantum Minerals Ltd. 6.500% 3/01/24 (f)		2,110,000		2,168,025
6.875% 3/01/26 (f)		1,191,000		1,241,617
6.875% 10/15/27 (f)		3,700,000		4,014,500
7.500% 4/01/25 (f)		2,796,000		2,911,335
Freeport-McMoRan, Inc. 4.125% 3/01/28		326,000		341,892
4.375% 8/01/28		1,544,000		1,640,500
4.625% 8/01/30		2,600,000		2,853,500
Hecla Mining Co. 7.250% 2/15/28		1,384,000		1,512,020
Hudbay Minerals, Inc. 6.125% 4/01/29 (f)		678,000		730,545
Kinross Gold Corp. 6.875% 9/01/41		1,177,000		1,618,694
New Gold, Inc. 6.375% 5/15/25 (f)		536,000		560,120
Northwest Acquisitions ULC/Dominion Finco, Inc. 7.125% 11/01/22 (e) (f)		3,748,000		25,299
				22,289,579

MassMutual Premier High Yield Fund —  Portfolio of Investments  (Continued)

		Principal Amount		Value
Miscellaneous - Manufacturing — 1.0%
Amsted Industries, Inc.
5.625% 7/01/27 (f)	$	2,783,000	$	2,956,937
Gates Global LLC / Gates Corp.
6.250% 1/15/26 (f)		2,800,000		2,940,000
				5,896,937
Oil & Gas — 7.9%
Antero Resources Corp.
8.375% 7/15/26 (f) (g)		965,000		984,966
Apache Corp.
4.750% 4/15/43		278,000		288,248
5.100% 9/01/40		556,000		592,835
5.350% 7/01/49		832,000		853,657
Cenovus Energy, Inc.
5.250% 6/15/37		1,000,000		1,132,087
5.400% 6/15/47		581,000		682,039
6.750% 11/15/39		656,000		867,294
Continental Resources, Inc.
3.800% 6/01/24		638,000		658,805
4.375% 1/15/28		719,000		737,119
5.750% 1/15/31 (f)		920,000		1,021,182
CVR Energy, Inc.
5.250% 2/15/25 (f)		1,500,000		1,447,500
5.750% 2/15/28 (f)		6,102,000		5,781,645
Hilcorp Energy I LP / Hilcorp Finance Co.
5.000% 12/01/24 (f)		338,000		336,452
5.750% 10/01/25 (f)		186,000		188,093
6.250% 11/01/28 (f)		1,910,000		1,950,587
MEG Energy Corp.
7.125% 2/01/27 (f)		2,722,000		2,810,465
Nabors Industries Ltd.
7.250% 1/15/26 (f)		1,262,000		884,877
7.500% 1/15/28 (f)		465,000		318,386
Neptune Energy Bondco PLC
6.625% 5/15/25 (f)		2,750,000		2,720,492
Occidental Petroleum Corp.
2.700% 2/15/23		131,000		130,876
2.900% 8/15/24		391,000		376,338
3.500% 6/15/25		804,000		776,632
4.200% 3/15/48		133,000		108,395
4.400% 4/15/46		838,000		730,288
4.400% 8/15/49		328,000		276,438
4.500% 7/15/44		340,000		288,150
5.875% 9/01/25		2,994,000		3,188,610
6.200% 3/15/40		2,447,000		2,422,530
6.375% 9/01/28		1,860,000		1,962,300
6.450% 9/15/36		954,000		998,838
6.600% 3/15/46		1,500,000		1,522,013
6.950% 7/01/24		369,000		398,520
Ovintiv Exploration, Inc.
5.375% 1/01/26		537,000		576,280
5.625% 7/01/24		1,554,000		1,664,543
Ovintiv, Inc.
6.500% 8/15/34		458,000		530,382
6.500% 2/01/38		214,000		238,964
6.625% 8/15/37		614,000		685,104

MassMutual Premier High Yield Fund —  Portfolio of Investments  (Continued)

	Principal Amount		Value
7.200% 11/01/31	$	129,000	$	152,673
7.375% 11/01/31		441,000		523,619
8.125% 9/15/30		510,000		622,781
Parkland Corp.
5.875% 7/15/27 (f)		1,149,000		1,242,333
PBF Holding Co. LLC / PBF Finance Corp.
6.000% 2/15/28		5,518,000		3,152,157
7.250% 6/15/25		2,184,000		1,415,745
9.250% 5/15/25 (f)		352,000		347,037
				48,588,275
Oil & Gas Services — 0.4%
Welltec A/S
9.500% 12/01/22 (f)		2,445,000		2,273,850
Packaging & Containers — 1.3%
Mauser Packaging Solutions Holding Co.
7.250% 4/15/25 (f)		3,211,000		3,243,110
Plastipak Holdings, Inc.
6.250% 10/15/25 (f)		2,970,000		3,059,100
Trident TPI Holdings, Inc.
9.250% 8/01/24 (f)		1,614,000		1,718,910
				8,021,120
Pharmaceuticals — 2.6%
Bausch Health Americas, Inc.
9.250% 4/01/26 (f)		4,611,000		5,141,265
Bausch Health Cos., Inc.
5.000% 1/30/28 (f)		1,953,000		2,012,645
5.000% 2/15/29 (f)		1,629,000		1,674,938
5.250% 1/30/30 (f)		916,000		961,800
5.250% 2/15/31 (f)		1,202,000		1,255,753
6.125% 4/15/25 (f)		250,000		257,665
9.000% 12/15/25 (f)		870,000		960,436
Endo DAC / Endo Finance LLC / Endo Finco, Inc.
6.000% 6/30/28 (f)		701,000		595,850
Par Pharmaceutical, Inc.
7.500% 4/01/27 (f)		2,647,000		2,871,995
				15,732,347
Pipelines — 3.9%
Blue Racer Midstream LLC / Blue Racer Finance Corp.
7.625% 12/15/25 (f)		790,000		841,350
Buckeye Partners LP
5.850% 11/15/43		277,000		272,551
Cheniere Energy Partners LP
5.625% 10/01/26		2,397,000		2,492,880
DCP Midstream Operating LP
5.625% 7/15/27		924,000		1,025,640
6.450% 11/03/36 (f)		43,000		46,440
EnLink Midstream LLC
5.375% 6/01/29		786,000		764,385
5.625% 1/15/28 (f)		449,000		458,070
EnLink Midstream Partners LP
4.850% 7/15/26		254,000		247,990
5.050% 4/01/45		160,000		127,502

MassMutual Premier High Yield Fund —  Portfolio of Investments  (Continued)

	Principal Amount		Value
5.600% 4/01/44	$	2,931,000	$	2,352,127
EQM Midstream Partners LP
6.000% 7/01/25 (f)		777,000		850,815
6.500% 7/01/27 (f)		644,000		725,167
Genesis Energy LP/Genesis Energy Finance Corp.
5.625% 6/15/24		610,000		594,750
6.250% 5/15/26		290,000		272,388
6.500% 10/01/25		3,466,000		3,370,685
8.000% 1/15/27		1,656,000		1,639,771
Harvest Midstream I LP
7.500% 9/01/28 (f)		1,049,000		1,115,874
Tallgrass Energy Partners LP/Tallgrass Energy Finance Corp.
7.500% 10/01/25 (f)		1,400,000		1,511,426
Targa Resources Partners LP/Targa Resources Partners Finance Corp.
4.875% 2/01/31 (f)		1,354,000		1,475,305
5.000% 1/15/28		139,000		146,723
5.500% 3/01/30		122,000		132,455
6.875% 1/15/29		259,000		291,699
Western Midstream Operating LP
5.050% STEP 2/01/30		618,000		692,043
5.300% 3/01/48		1,707,000		1,691,569
5.450% 4/01/44		850,000		859,580
				23,999,185
Real Estate — 0.1%
Realogy Group LLC/Realogy Co-Issuer Corp.
9.375% 4/01/27 (f)		742,000		821,765
Real Estate Investment Trusts  (REITS) — 2.2%
ESH Hospitality, Inc.
4.625% 10/01/27 (f)		1,689,000		1,731,225
Iron Mountain, Inc.
5.250% 7/15/30 (f)		1,273,000		1,374,840
Park Intermediate Holdings LLC / PK Domestic Property LLC / PK Finance Co-Issuer
5.875% 10/01/28 (f)		1,082,000		1,152,330
RHP Hotel Properties LP/RHP Finance Corp.
4.750% 10/15/27		1,850,000		1,914,750
5.000% 4/15/23		1,315,000		1,318,288
Service Properties Trust
3.950% 1/15/28		330,000		318,863
4.375% 2/15/30		521,000		507,975
4.950% 2/15/27		261,000		262,305
5.500% 12/15/27		822,000		898,741
7.500% 9/15/25		2,061,000		2,374,930
Uniti Group LP / Uniti Fiber Holdings, Inc. / CSL Capital LLC
7.125% 12/15/24 (f)		277,000		279,770
7.875% 2/15/25 (f)		153,000		164,354
8.250% 10/15/23		1,030,000		1,037,725
				13,336,096
Retail — 2.0%
Beacon Roofing Supply, Inc.
4.875% 11/01/25 (f)		1,917,000		1,962,529
LBM Acquisition LLC
6.250% 1/15/29 (f)		885,000		913,762
Penske Automotive Group, Inc.

MassMutual Premier High Yield Fund —  Portfolio of Investments  (Continued)

	Principal Amount		Value
3.500% 9/01/25	$	3,809,000	$	3,870,896
5.500% 5/15/26		3,689,000		3,831,949
Staples, Inc.
7.500% 4/15/26 (f)		1,539,000		1,607,132
				12,186,268
Software — 4.6%
Avaya Holdings Corp., Convertible,
2.250% 6/15/23		1,640,000		1,708,327
BY Crown Parent LLC
7.375% 10/15/24 (f)		1,007,000		1,024,622
BY Crown Parent LLC / BY Bond Finance, Inc.
4.250% 1/31/26 (f)		4,709,000		4,826,725
Solera LLC/ Solera Finance, Inc.
10.500% 3/01/24 (f)		3,995,000		4,139,819
SS&C Technologies, Inc.
5.500% 9/30/27 (f)		1,887,000		2,015,354
Veritas US, Inc./Veritas Bermuda Ltd.
7.500% 9/01/25 (f)		2,800,000		2,873,500
10.500% 2/01/24 (f)		11,112,000		11,278,680
				27,867,027
Storage & Warehousing — 0.5%
LBC Tank Terminals Holding Netherlands BV
6.875% 5/15/23 (f)		3,188,000		3,188,000
Telecommunications — 6.4%
Avaya, Inc.
6.125% 9/15/28 (f)		580,000		619,591
CenturyLink, Inc.
5.125% 12/15/26 (f)		2,211,000		2,334,728
6.750% 12/01/23		1,215,000		1,353,206
CommScope Technologies Finance LLC
6.000% 6/15/25 (f)		862,000		881,395
CommScope Technologies LLC
5.000% 3/15/27 (f)		1,015,000		999,775
CommScope, Inc.
7.125% 7/01/28 (f)		500,000		532,500
8.250% 3/01/27 (f)		1,459,000		1,557,483
Consolidated Communications, Inc.
6.500% 10/01/28 (f)		2,049,000		2,192,430
Frontier Communications Corp.
5.000% 5/01/28 (f)		2,881,000		3,003,442
6.750% 5/01/29 (f)		783,000		837,810
Hughes Satellite Systems Corp.
6.625% 8/01/26		3,035,000		3,434,011
Sprint Capital Corp.
8.750% 3/15/32		2,219,000		3,513,509
Sprint Corp.
7.625% 3/01/26		3,526,000		4,376,454
7.875% 9/15/23		3,858,000		4,466,792
T-Mobile USA, Inc.
4.500% 2/01/26		488,000		498,899
Telecom Italia Capital
6.000% 9/30/34		704,000		857,535
Telecom Italia SpA
5.303% 5/30/24 (f)		2,027,000		2,204,363

MassMutual Premier High Yield Fund —  Portfolio of Investments  (Continued)

	Principal Amount		Value
ViaSat, Inc.
5.625% 9/15/25 (f)	$	1,272,000	$	1,301,002
5.625% 4/15/27 (f)		796,000		835,800
6.500% 7/15/28 (f)		1,654,000		1,789,975
Windstream Escrow LLC / Windstream Escrow Finance Corp.
7.750% 8/15/28 (f)		1,456,000		1,466,192
				39,056,892
Toys, Games & Hobbies — 0.3%
Mattel, Inc.
6.750% 12/31/25 (f)		1,534,000		1,619,091
Transportation — 1.9%
Kenan Advantage Group, Inc.
7.875% 7/31/23 (f)		6,737,000		6,737,000
XPO Logistics, Inc.
6.250% 5/01/25 (f)		500,000		538,070
6.750% 8/15/24 (f)		4,277,000		4,544,312
				11,819,382
TOTAL CORPORATE DEBT (Cost $537,140,725)				560,640,203
TOTAL BONDS & NOTES (Cost $574,688,808)				595,819,348
TOTAL LONG-TERM INVESTMENTS (Cost $579,022,429)				597,782,012
Short-Term Investments — 3.0%
Commercial Paper — 0.7%
Walgreens Boots Alliance, Inc.
0.183% 1/04/21 (f)		4,000,000		3,999,898
Repurchase Agreement — 2.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (h)		14,213,481		14,213,481
TOTAL SHORT-TERM INVESTMENTS (Cost $18,213,421)				18,213,379
TOTAL INVESTMENTS — 100.7%  (Cost $597,235,850)  (i)				615,995,391
Other Assets/ (Liabilities) —  (0.7)%				(4,530,633	)
NET ASSETS — 100.0%			$	611,464,758

MassMutual Premier High Yield Fund —  Portfolio of Investments  (Continued)

Abbreviation Legend

STEP Step Up Bond

VRN Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At December 31, 2020, these securities amounted to a value of $1,962,664 or 0.32%  of net assets.

(b) Non-income producing security.

(c) Investment was valued using significant unobservable inputs.

(d) All or a portion of the security represents unsettled loan commitments at December 31, 2020 where the rate will be determined at time of settlement.

(e) Security is currently in default due to bankruptcy or failure to make payment of principal or interest of the issuer. Income is not being accrued. At December 31, 2020, these securities amounted to a value of $26,008 or 0.00%  of net assets.

(f) Security is exempt from registration under Regulation S or Rule 144A of the Securities Act of 1933. These securities are considered restricted and may be resold in transactions exempt from registration. At December 31, 2020, the aggregate market value of these securities amounted to $388,256,693 or 63.50%  of net assets.

(g) A portion of this security is purchased on a when-issued, delayed-delivery or forward commitment basis.

(h) Maturity value of $14,213,481. Collateralized by U.S. Government Agency obligations with a rate of 0.000% , maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $14,497,819.

(i) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Balanced Fund — Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 67.6%
Common Stock — 67.6%
Basic Materials — 1.1%
Chemicals — 0.6%
Celanese Corp.		1,492	$	193,870
Eastman Chemical Co.		2,363		236,962
LyondellBasell Industries NV Class A		5,199		476,540
				907,372
Forest Products & Paper — 0.4%
International Paper Co.		10,019		498,145
Iron & Steel — 0.1%
Steel Dynamics, Inc.		3,662		135,018
				1,540,535
Communications — 9.7%
Internet — 0.4%
eBay, Inc.		13,533		680,033
Media — 0.5%
Fox Corp. Class A		10,029		292,044
Liberty Global PLC Class C (a)		14,910		352,622
TEGNA, Inc.		3,183		44,403
				689,069
Telecommunications — 8.8%
AT&T, Inc.		141,371		4,065,830
CenturyLink, Inc.		19,580		190,905
Ciena Corp. (a)		2,019		106,704
Cisco Systems, Inc.		76,292		3,414,067
Corning, Inc.		12,039		433,404
Juniper Networks, Inc.		6,650		149,692
Verizon Communications, Inc.		76,569		4,498,429
				12,859,031
				14,228,133
Consumer, Cyclical — 9.9%
Apparel — 0.1%
Carter's, Inc.		571		53,714
Hanesbrands, Inc.		5,467		79,709
				133,423

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Auto Manufacturers — 1.5%
Cummins, Inc.		2,511	$	570,248
Ford Motor Co.		141,565		1,244,356
PACCAR, Inc.		5,106		440,546
				2,255,150
Auto Parts & Equipment — 0.2%
Allison Transmission Holdings, Inc.		2,886		124,473
Gentex Corp.		3,828		129,884
				254,357
Home Builders — 0.0%
Toll Brothers, Inc.		1,521		66,118
Home Furnishing — 0.2%
Whirlpool Corp.		1,406		253,769
Housewares — 0.1%
Newell Brands, Inc.		5,809		123,325
Leisure Time — 0.1%
Harley-Davidson, Inc.		2,962		108,705
Retail — 7.6%
AutoNation, Inc. (a)		1,627		113,548
AutoZone, Inc. (a)		348		412,533
Best Buy Co., Inc.		4,342		433,288
Costco Wholesale Corp.		5,970		2,249,376
The Home Depot, Inc.		16,343		4,341,028
Kohl's Corp.		2,040		83,008
Lowe's Cos., Inc.		11,433		1,835,111
Target Corp.		7,605		1,342,511
Tractor Supply Co.		1,938		272,444
Williams-Sonoma, Inc.		1,223		124,550
				11,207,397
Textiles — 0.1%
Mohawk Industries, Inc. (a)		851		119,949
				14,522,193
Consumer, Non-cyclical — 17.9%
Beverages — 0.1%
Molson Coors Beverage Co. Class B		4,735		213,975
Biotechnology — 3.0%
Alexion Pharmaceuticals, Inc. (a)		3,164		494,343
Amgen, Inc.		6,446		1,482,064
Biogen, Inc. (a)		4,498		1,101,380
Gilead Sciences, Inc.		19,838		1,155,762
United Therapeutics Corp. (a)		703		106,709
				4,340,258
Commercial Services — 0.7%
Booz Allen Hamilton Holding Corp.		1,939		169,042
ManpowerGroup, Inc.		969		87,384

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Quanta Services, Inc.		4,077	$	293,626
United Rentals, Inc. (a)		1,908		442,484
				992,536
Cosmetics & Personal Care — 3.8%
Colgate-Palmolive Co.		12,610		1,078,281
The Procter & Gamble Co.		32,744		4,556,000
				5,634,281
Foods — 1.4%
Flowers Foods, Inc.		3,311		74,928
The Hershey Co.		1,868		284,553
Ingredion, Inc.		1,361		107,070
The J.M. Smucker Co.		3,089		357,088
The Kroger Co.		36,057		1,145,170
Sprouts Farmers Market, Inc. (a)		2,913		58,551
				2,027,360
Health Care – Products — 1.1%
Thermo Fisher Scientific, Inc.		3,451		1,607,407
Health Care – Services — 4.0%
Anthem, Inc.		3,443		1,105,513
DaVita, Inc. (a)		1,973		231,630
HCA Healthcare, Inc.		2,516		413,782
Humana, Inc.		1,938		795,103
Laboratory Corp. of America Holdings (a)		1,111		226,144
Quest Diagnostics, Inc.		1,349		160,760
UnitedHealth Group, Inc.		8,448		2,962,545
				5,895,477
Household Products & Wares — 0.3%
The Clorox Co.		1,978		399,398
Pharmaceuticals — 3.5%
CVS Health Corp.		12,911		881,821
Jazz Pharmaceuticals PLC (a)		897		148,050
Merck & Co., Inc.		25,845		2,114,121
Pfizer, Inc.		52,704		1,940,034
				5,084,026
				26,194,718
Energy — 0.6%
Oil & Gas — 0.3%
Valero Energy Corp.		6,854		387,731
Pipelines — 0.3%
Kinder Morgan, Inc.		37,355		510,643
				898,374
Financial — 3.9%
Banks — 0.9%
Associated Banc-Corp.		2,319		39,539

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Morgan Stanley		19,770	$	1,354,838
				1,394,377
Diversified Financial Services — 0.2%
Affiliated Managers Group, Inc.		800		81,360
Alliance Data Systems Corp.		1,534		113,670
SLM Corp.		6,275		77,747
				272,777
Insurance — 2.4%
Aflac, Inc.		11,782		523,946
The Allstate Corp.		5,467		600,987
Enstar Group Ltd. (a)		792		162,273
Everest Re Group Ltd.		526		123,131
The Hanover Insurance Group, Inc.		475		55,537
The Hartford Financial Services Group, Inc.		4,661		228,296
MetLife, Inc.		15,869		745,050
Prudential Financial, Inc.		6,035		471,152
The Travelers Cos., Inc.		3,614		507,297
Unum Group		4,650		106,671
				3,524,340
Real Estate Investment Trusts (REITS) — 0.4%
Apartment Income REIT Corp. (a)		11		422
Apartment Investment and Management Co. Class A		11		58
Brixmor Property Group, Inc.		3,936		65,141
Kimco Realty Corp.		6,955		104,395
Regency Centers Corp.		2,298		104,766
SL Green Realty Corp. (b)		3,659		218,003
Weingarten Realty Investors		1,626		35,235
				528,020
				5,719,514
Industrial — 5.2%
Building Materials — 0.7%
Johnson Controls International PLC		17,756		827,252
Lennox International, Inc.		486		133,149
				960,401
Electrical Components & Equipment — 0.5%
Acuity Brands, Inc.		549		66,478
Emerson Electric Co.		8,307		667,634
				734,112
Electronics — 0.3%
Arrow Electronics, Inc. (a)		2,366		230,212
Avnet, Inc.		2,035		71,449
Jabil, Inc.		1,851		78,723
				380,384
Engineering & Construction — 0.1%
Jacobs Engineering Group, Inc.		1,649		179,675

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Environmental Controls — 0.4%
Pentair PLC		2,407	$	127,788
Republic Services, Inc.		4,948		476,492
				604,280
Hand & Machine Tools — 0.1%
Snap-on, Inc.		1,052		180,039
Machinery – Diversified — 1.0%
AGCO Corp.		1,394		143,708
Deere & Co.		5,108		1,374,307
				1,518,015
Metal Fabricate & Hardware — 0.1%
The Timken Co.		1,376		106,447
Miscellaneous - Manufacturing — 1.5%
3M Co.		7,453		1,302,710
Carlisle Cos., Inc.		914		142,749
Eaton Corp. PLC		6,053		727,207
				2,172,666
Packaging & Containers — 0.4%
Berry Global Group, Inc. (a)		3,705		208,184
Packaging Corp. of America		1,308		180,387
Sealed Air Corp.		2,794		127,937
Sonoco Products Co.		1,809		107,183
				623,691
Transportation — 0.1%
XPO Logistics, Inc. (a)		1,489		177,489
				7,637,199
Technology — 14.4%
Computers — 4.3%
Accenture PLC Class A		9,083		2,372,570
Amdocs Ltd.		2,333		165,480
Cognizant Technology Solutions Corp. Class A		10,134		830,481
Dell Technologies C (a)		3,943		288,982
HP, Inc.		21,173		520,644
International Business Machines Corp.		12,929		1,627,503
Leidos Holdings, Inc.		2,347		246,717
NCR Corp. (a)		2,132		80,099
Seagate Technology PLC		3,957		245,967
				6,378,443
Office & Business Equipment — 0.1%
Xerox Holdings Corp.		4,257		98,720
Semiconductors — 7.0%
Broadcom, Inc.		5,253		2,300,026
Intel Corp.		101,282		5,045,869
Qorvo, Inc. (a)		1,663		276,507
Skyworks Solutions, Inc.		2,168		331,444

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Teradyne, Inc.		2,326	$	278,864
Texas Instruments, Inc.		12,227		2,006,818
				10,239,528
Software — 3.0%
Akamai Technologies, Inc. (a)		2,038		213,970
Cerner Corp.		3,829		300,500
Citrix Systems, Inc.		1,568		203,997
Electronic Arts, Inc.		4,325		621,070
Oracle Corp.		44,958		2,908,333
Teradata Corp. (a)		1,683		37,817
VMware, Inc. Class A (a)		1,217		170,696
				4,456,383
				21,173,074
Utilities — 4.9%
Electric — 4.9%
AES Corp.		15,068		354,098
Ameren Corp.		2,390		186,564
Avangrid, Inc.		567		25,770
Consolidated Edison, Inc.		3,929		283,949
DTE Energy Co.		2,481		301,218
Duke Energy Corp.		7,580		694,025
Exelon Corp.		14,831		626,165
NextEra Energy, Inc.		40,442		3,120,100
OGE Energy Corp.		2,905		92,553
Pinnacle West Capital Corp.		1,020		81,549
PPL Corp.		9,206		259,609
Public Service Enterprise Group, Inc.		11,980		698,434
WEC Energy Group, Inc.		4,993		459,506
				7,183,540
TOTAL COMMON STOCK (Cost $96,304,558)				99,097,280
TOTAL EQUITIES (Cost $96,304,558)				99,097,280

	Principal Amount
Bonds & Notes — 35.1%
Corporate Debt — 13.7%
Advertising — 0.3%
The Interpublic Group of Cos., Inc.  4.650% 10/01/28	$	344,000	415,484
Agriculture — 0.1%
Bunge Ltd. Finance Corp. 1.630% 8/17/25		15,000	15,503
3.250% 8/15/26		51,000	56,685

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
4.350% 3/15/24	$	85,000	$	93,766
				165,954
Airlines — 0.1%
Delta Air Lines, Inc./SkyMiles IP Ltd. 4.500% 10/20/25 (c)		92,000		98,335
Banks — 2.8%
Australia & New Zealand Banking Group Ltd. 5 year CMT + 1.700%, VRN 2.570% 11/25/35 (c)		225,000		229,538
Bank of America Corp. SOFR + 2.150%, VRN 2.592% 4/29/31		55,000		58,947
4.183% 11/25/27		45,000		52,204
3 mo. USD LIBOR + 1.814%, VRN 4.244% 4/24/38		25,000		30,798
3 mo. USD LIBOR + 1.310%, VRN 4.271% 7/23/29		20,000		23,815
4.750% 4/21/45		70,000		96,621
7.750% 5/14/38		20,000		34,100
The Bank of Nova Scotia 4.500% 12/16/25		40,000		46,638
3 mo. USD LIBOR + 2.648%, VRN 4.650% (d)		125,000		125,625
Citigroup, Inc. 4.450% 9/29/27		30,000		35,464
5.500% 9/13/25		60,000		72,098
5.875% 1/30/42		20,000		30,377
6.000% 10/31/33		17,000		23,364
6.625% 6/15/32		15,000		21,264
8.125% 7/15/39		15,000		26,813
Credit Suisse Group AG SOFR + 2.044%, VRN 2.193% 6/05/26 (c)		393,000		410,706
The Goldman Sachs Group, Inc. 4.250% 10/21/25		35,000		40,138
5.950% 1/15/27		80,000		100,844
6.750% 10/01/37		35,000		53,556
ING Groep NV 4.050% 4/09/29		344,000		408,684
JP Morgan Chase & Co. SOFR + 2.515%, VRN 2.956% 5/13/31		45,000		49,347
5.600% 7/15/41		45,000		68,076
JPMorgan Chase & Co. 3 mo. USD LIBOR + 1.160%, VRN 3.702% 5/06/30		354,000		410,652
KeyBank NA/Cleveland OH 3.900% 4/13/29		356,000		412,932
Morgan Stanley 4.350% 9/08/26		135,000		159,163
3 mo. USD LIBOR + 1.628%, VRN 4.431% 1/23/30		337,000		409,929
5.000% 11/24/25		40,000		47,813
SVB Financial Group 3.125% 6/05/30		20,000		22,519
3.500% 1/29/25		85,000		92,644
The Toronto-Dominion Bank 5 year USD Swap + 2.205%, VRN 3.625% 9/15/31		414,000		469,191
				4,063,860
Beverages — 0.3%
Keurig Dr Pepper, Inc.
3.400% 11/15/25		365,000		409,074

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Biotechnology — 0.3%
Amgen, Inc. 2.200% 2/21/27	$	385,000	$	412,725
Commercial Services — 0.3%
Moody's Corp. 4.250% 2/01/29		342,000		410,984
PayPal Holdings, Inc. 3.250% 6/01/50		30,000		34,607
				445,591
Computers — 0.9%
Apple, Inc. 1.650% 5/11/30		50,000		51,496
2.650% 5/11/50		30,000		31,841
3.000% 6/20/27		362,000		405,510
Dell International LLC / EMC Corp. 4.000% 7/15/24 (c)		372,000		410,177
Hewlett Packard Enterprise Co. STEP 4.900% 10/15/25		353,000		412,997
				1,312,021
Diversified Financial Services — 0.1%
The Charles Schwab Corp. 10 year CMT + 3.079%, VRN 4.000% (d)		103,000		108,407
CI Financial Corp. 3.200% 12/17/30		72,000		73,675
				182,082
Electric — 0.2%
Entergy Arkansas LLC 2.650% 6/15/51		80,000		82,020
Entergy Louisiana LLC 4.950% 1/15/45		40,000		44,142
Nevada Power Co. 6.650% 4/01/36		20,000		30,540
Xcel Energy, Inc. 6.500% 7/01/36		110,000		165,201
				321,903
Foods — 0.5%
Conagra Brands, Inc. 4.850% 11/01/28		329,000		408,577
General Mills, Inc. 4.700% 4/17/48		180,000		252,355
Ingredion, Inc. 3.200% 10/01/26		27,000		30,033
Mars, Inc. 3.950% 4/01/49 (c)		75,000		95,570
				786,535
Health Care – Services — 0.3%
HCA, Inc. 5.000% 3/15/24		363,000		408,366

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Humana, Inc. 4.800% 3/15/47	$	25,000	$	33,395
UnitedHealth Group, Inc. 3.125% 5/15/60		40,000		46,434
West Virginia United Health System Obligated Group 3.129% 6/01/50		28,000		29,240
				517,435
Insurance — 0.9%
Allstate Corp. 3 mo. USD LIBOR + 2.938%, VRN 5.750% 8/15/53		175,000		187,260
American International Group, Inc. 4.200% 4/01/28		40,000		47,485
4.500% 7/16/44		25,000		32,035
4.750% 4/01/48		15,000		20,013
3 mo. USD LIBOR + 2.868%, VRN 5.750% 4/01/48		115,000		131,459
Arch Capital Finance LLC 5.031% 12/15/46		30,000		40,940
Arch Capital Group Ltd. 3.635% 6/30/50		55,000		64,007
Marsh & McLennan Cos., Inc. 4.375% 3/15/29		334,000		406,653
New York Life Insurance Co. 3.750% 5/15/50 (c)		25,000		29,906
Prudential Financial, Inc. 5 year CMT + 3.035%, VRN 3.700% 10/01/50		20,000		21,156
3 mo. USD LIBOR + 3.920%, VRN 5.625% 6/15/43		45,000		48,259
3 mo. USD LIBOR + 2.665%, VRN 5.700% 9/15/48 (b)		110,000		126,997
3 mo. USD LIBOR + 4.175%, VRN 5.875% 9/15/42		50,000		53,657
Reinsurance Group of America, Inc. 3.150% 6/15/30		55,000		60,138
3.900% 5/15/29		60,000		68,801
USF&G Capital I 8.500% 12/15/45 (c)		35,000		56,383
				1,395,149
Internet — 0.2%
Alphabet, Inc. 2.250% 8/15/60		35,000		33,844
Prosus NV 3.832% 2/08/51 (c)		233,000		228,650
				262,494
Media — 0.9%
Charter Communications Operating LLC/Charter Communications Operating Capital 3.750% 2/15/28		212,000		237,701
3.850% 4/01/61		150,000		151,222
6.484% 10/23/45		35,000		49,506
Comcast Corp. 3.400% 7/15/46		45,000		51,807
3.450% 2/01/50		55,000		64,904
3.750% 4/01/40		168,000		202,948
3.969% 11/01/47		25,000		31,348
4.750% 3/01/44		35,000		47,966
Discovery Communications LLC 3.625% 5/15/30		178,000		203,900

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
3.950% 3/20/28	$	62,000	$	71,163
4.000% 9/15/55 (c)		30,000		33,579
4.650% 5/15/50		30,000		37,522
Time Warner Cable, Inc. 6.750% 6/15/39		30,000		42,696
The Walt Disney Co. 3.600% 1/13/51		65,000		78,683
				1,304,945
Mining — 0.0%
Teck Resources Ltd. 6.000% 8/15/40		35,000		43,853
Miscellaneous - Manufacturing — 0.0%
General Electric Co. 4.125% 10/09/42		5,000		5,861
Oil & Gas — 0.2%
BP Capital Markets America, Inc. 2.939% 6/04/51		160,000		163,446
BP Capital Markets PLC 5 year CMT + 4.036%, VRN 4.375% (d)		65,000		69,553
				232,999
Packaging & Containers — 0.2%
Berry Global, Inc. 1.570% 1/15/26 (c)		53,000		53,480
WRKCo, Inc. 3.000% 6/15/33		30,000		32,960
4.650% 3/15/26		213,000		250,501
				336,941
Pharmaceuticals — 0.9%
AbbVie, Inc. 4.700% 5/14/45		75,000		98,116
Becton Dickinson and Co. 4.685% 12/15/44		25,000		32,270
Bristol-Myers Squibb Co. 3.900% 2/20/28		345,000		408,449
4.350% 11/15/47		30,000		40,406
Cigna Corp. 2.400% 3/15/30		387,000		412,628
4.800% 7/15/46		30,000		39,543
CVS Health Corp. 4.300% 3/25/28		26,000		30,939
5.050% 3/25/48		209,000		283,253
6.125% 9/15/39		10,000		14,115
				1,359,719
Pipelines — 1.0%
Enterprise Products Operating LLC 3 mo. USD LIBOR + 3.033%, VRN 5.250% 8/16/77		45,000		45,624
3 mo. USD LIBOR + 2.570%, VRN 5.375% 2/15/78		30,000		30,315
Kinder Morgan, Inc. 3.250% 8/01/50		263,000		261,382
MPLX LP

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
1.750% 3/01/26	$	405,000	$	419,137
4.500% 4/15/38		30,000		34,314
ONEOK, Inc. 6.350% 1/15/31		336,000		430,792
Sabine Pass Liquefaction LLC 4.500% 5/15/30 (c)		217,000		257,205
				1,478,769
Real Estate Investment Trusts (REITS) — 0.5%
Crown Castle International Corp. 3.700% 6/15/26		268,000		302,007
5.200% 2/15/49		13,000		17,703
Host Hotels & Resorts LP 3.500% 9/15/30		93,000		97,980
VEREIT Operating Partnership LP 2.850% 12/15/32		350,000		365,977
				783,667
Retail — 1.2%
Advance Auto Parts, Inc. 1.750% 10/01/27		15,000		15,234
3.900% 4/15/30		357,000		410,529
AutoZone, Inc. 1.650% 1/15/31		45,000		44,632
The Home Depot, Inc. 2.700% 4/15/30		224,000		250,009
Lowe's Cos., Inc. 3.000% 10/15/50		236,000		252,429
McDonald's Corp. 3.300% 7/01/25		367,000		408,679
Starbucks Corp. 2.550% 11/15/30		70,000		75,704
4.450% 8/15/49		195,000		257,235
				1,714,451
Semiconductors — 0.6%
Lam Research Corp. 3.750% 3/15/26		355,000		405,778
Micron Technology, Inc. 4.185% 2/15/27		356,000		416,718
				822,496
Software — 0.3%
Microsoft Corp.
4.450% 11/03/45		89,000		126,306
Oracle Corp. 3.600% 4/01/40		218,000		255,319
				381,625
Telecommunications — 0.3%
Verizon Communications, Inc. 3.875% 2/08/29		347,000		408,453

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
Transportation — 0.3%
CSX Corp. 4.750% 11/15/48	$	20,000	$	27,433
Ryder System, Inc. 3.650% 3/18/24		374,000		408,680
				436,113
TOTAL CORPORATE DEBT (Cost $19,327,016)				20,098,534
Non-U.S. Government Agency Obligations — 0.4%
Commercial Mortgage-Backed Securities — 0.4%
BANK Series 2019-BN17, Class B, VRN 4.128% 4/15/52 (e)		29,000		33,318
Series 2019-BN16, Class AS, 4.267% 2/15/52		31,333		36,893
Series 2019-BN16, Class B, VRN 4.438% 2/15/52 (e)		24,330		28,236
BBCMS Mortgage Trust, Series 2020-C7, Class AS 2.444% 4/15/53		57,000		60,317
Benchmark Mortgage Trust, Series 2019-B14, Class AS 3.352% 12/15/62		150,000		165,745
Citigroup Commercial Mortgage Trust, Series 2017-C4, Class C, VRN 4.191% 10/12/50 (e)		70,000		67,308
Commercial Mortgage Pass-Through Certificates, Series 2014-LC17, Class C, VRN 4.553% 10/10/47 (e)		100,000		101,825
GS Mortgage Securities Trust, Series 2017-GS6, Class B 3.869% 5/10/50		79,000		87,700
Morgan Stanley Capital I Trust, Series 2018-H3, Class B, VRN 4.620% 7/15/51 (e)		20,000		23,100
Wells Fargo Commercial Mortgage Trust Series 2018-C45, Class AS, VRN 4.405% 6/15/51 (e)		30,000		34,984
Series 2018-C45, Class B, 4.556% 6/16/51		10,000		11,624
				651,050
TOTAL NON-U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $612,405)				651,050
U.S. Government Agency Obligations and Instrumentalities — 7.3%
Pass-Through Securities — 7.3%
Uniform Mortgage Backed Securities TBA 2.000% 6/01/35 (f)		3,500,000		3,660,234
2.000% 5/01/50 (f)		4,500,000		4,668,574
2.500% 12/01/49 (f)		2,200,000		2,315,242
				10,644,050
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES   (Cost $10,604,500)				10,644,050
U.S. Treasury Obligations — 13.7%
U.S. Treasury Bonds & Notes — 13.7%
U.S. Treasury Bond 1.375% 11/15/40		600,000		593,480
1.375% 8/15/50		240,800		225,500
2.250% 8/15/49 (g)		873,900		1,000,808

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

	Principal Amount		Value
U.S. Treasury Note
0.125% 11/30/22	$	1,700,000	$	1,700,136
0.125% 5/15/23		1,900,000		1,899,493
0.125% 12/15/23		1,500,000		1,498,235
0.250% 11/15/23		1,000,000		1,002,699
0.375% 4/30/25		2,043,600		2,050,956
0.375% 11/30/25		947,700		949,038
0.625% 11/30/27		250,000		249,937
0.875% 11/15/30 (b)		428,000		426,555
1.500% 11/30/21		8,388,400		8,493,915
				20,090,752
TOTAL U.S. TREASURY OBLIGATIONS (Cost $20,129,925)				20,090,752
TOTAL BONDS & NOTES (Cost $50,673,846)				51,484,386

	Number of Shares
Mutual Funds — 0.3%
Diversified Financial Services — 0.3%
State Street Navigator Securities Lending Prime Portfolio (h)	455,145	455,145
TOTAL MUTUAL FUNDS (Cost $455,145)		455,145
TOTAL LONG-TERM INVESTMENTS (Cost $147,433,549)		151,036,811

	Principal Amount
Short-Term Investments — 5.6%
Repurchase Agreement — 5.6%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (i)	$	8,210,720		8,210,720
TOTAL SHORT-TERM INVESTMENTS (Cost $8,210,720)				8,210,720
TOTAL INVESTMENTS — 108.6% (Cost $155,644,269) (j)				159,247,531
Other Assets/(Liabilities) — (8.6)%				(12,672,341	)
NET ASSETS — 100.0%			$	146,575,190

MassMutual Premier Balanced Fund — Portfolio of Investments (Continued)

Abbreviation Legend

STEP	Step Up Bond
TBA	To Be Announced
VRN	Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a)	Non-income producing security.
(b)	Denotes all or a portion of security on loan. The total value of securities on loan as of December 31, 2020, was $618,339 or 0.42% of net assets. Total securities on loan may be less than the amounts identified in the Portfolio of Investments. The Fund received $171,522 of non-cash collateral (U.S. Treasury and/or Agency obligations) related to securities lending activity. This amount is not reflected on the Portfolio of Investments. (Note 2).
(c)	Security is exempt from registration under Regulation S or Rule 144A of the Securities Act of 1933. These securities are considered restricted and may be resold in transactions exempt from registration. At December 31, 2020, the aggregate market value of these securities amounted to $1,903,529 or 1.30% of net assets.
(d)	Security is perpetual and has no stated maturity date.
(e)	Certain variable rate securities are not based on a published reference rate and spread but are determined by the issuer or agent and are based on current market conditions. These securities do not indicate a reference rate and spread in their description above. The rates shown are the current interest rates at December 31, 2020.
(f)	A portion of this security is purchased on a when-issued, delayed-delivery or forward commitment basis.
(g)	A portion of this security is pledged/held as collateral for open derivatives.
(h)	Represents investment of security lending cash collateral. (Note 2).
(i)	Maturity value of $8,210,720. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $8,374,949.
(j)	See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Disciplined Value Fund —  Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 99.0%
Common Stock — 99.0%
Basic Materials — 1.4%
Iron & Steel — 0.7%
Nucor Corp.		11,826	$	629,025
Mining — 0.7%
Newmont Corp.		11,003		658,970
				1,287,995
Communications — 3.4%
Advertising — 1.1%
Omnicom Group, Inc.		16,994		1,059,916
Media — 2.3%
Discovery, Inc. Class A (a)		16,078		483,787
Discovery, Inc. Class C (a)		24,127		631,886
ViacomCBS, Inc. Class B		26,249		978,038
				2,093,711
				3,153,627
Consumer, Cyclical — 10.3%
Apparel — 0.5%
VF Corp.		5,428		463,605
Auto Manufacturers — 3.2%
Ford Motor Co.		105,434		926,765
General Motors Co.		27,624		1,150,263
PACCAR, Inc.		10,236		883,162
				2,960,190
Auto Parts & Equipment — 0.8%
Autoliv, Inc.		2,541		234,026
BorgWarner, Inc.		12,839		496,099
				730,125
Home Builders — 2.8%
D.R. Horton, Inc.		9,216		635,167
Lennar Corp. Class A		10,107		770,457
NVR, Inc. (a)		153		624,218
PulteGroup, Inc.		13,157		567,330
				2,597,172

MassMutual Premier Disciplined Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Retail — 3.0%
Advance Auto Parts, Inc.		1,620	$	255,166
CarMax, Inc. (a)		6,775		639,967
McDonald's Corp.		3,657		784,719
Tiffany & Co.		1,966		258,431
Walmart, Inc.		6,374		918,812
				2,857,095
				9,608,187
Consumer, Non-cyclical — 28.2%
Agriculture — 1.7%
Altria Group, Inc.		16,819		689,579
Philip Morris International, Inc.		11,376		941,819
				1,631,398
Beverages — 4.2%
Brown-Forman Corp. Class B		11,666		926,630
The Coca-Cola Co.		22,023		1,207,741
Keurig Dr Pepper, Inc.		21,297		681,504
PepsiCo, Inc.		7,638		1,132,716
				3,948,591
Biotechnology — 3.0%
Alexion Pharmaceuticals, Inc. (a)		11,387		1,779,105
Biogen, Inc. (a)		4,058		993,642
				2,772,747
Commercial Services — 1.2%
Equifax, Inc.		4,172		804,528
Rollins, Inc.		8,640		337,565
				1,142,093
Cosmetics & Personal Care — 2.0%
Colgate-Palmolive Co.		4,654		397,964
The Procter & Gamble Co.		10,317		1,435,507
				1,833,471
Foods — 1.8%
Campbell Soup Co.		4,569		220,911
General Mills, Inc.		7,486		440,177
Kellogg Co.		4,652		289,494
Mondelez International, Inc. Class A		12,195		713,042
				1,663,624
Health Care – Products — 0.2%
Varian Medical Systems, Inc. (a)		1,026		179,560
Health Care – Services — 4.7%
Anthem, Inc.		9,178		2,946,964
Catalent, Inc. (a)		4,694		488,505
Centene Corp. (a)		11,100		666,333

MassMutual Premier Disciplined Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Quest Diagnostics, Inc.		2,517	$	299,951
				4,401,753
Household Products & Wares — 0.8%
The Clorox Co.		1,084		218,881
Kimberly-Clark Corp.		3,908		526,916
				745,797
Pharmaceuticals — 8.6%
AmerisourceBergen Corp.		13,587		1,328,265
Bristol-Myers Squibb Co.		59,913		3,716,403
Cigna Corp.		8,779		1,827,612
Jazz Pharmaceuticals PLC (a)		6,833		1,127,787
				8,000,067
				26,319,101
Energy — 3.6%
Oil & Gas — 3.6%
Chevron Corp.		23,020		1,944,039
EOG Resources, Inc.		17,267		861,105
Pioneer Natural Resources Co.		5,070		577,423
				3,382,567
				3,382,567
Financial — 22.9%
Banks — 0.5%
The Bank of New York Mellon Corp.		10,864		461,068
Diversified Financial Services — 6.9%
BlackRock, Inc.		1,208		871,620
Cboe Global Markets, Inc.		6,610		615,523
CME Group, Inc.		8,644		1,573,640
Franklin Resources, Inc.		26,767		668,907
T. Rowe Price Group, Inc.		14,299		2,164,726
The Western Union Co.		25,539		560,326
				6,454,742
Insurance — 13.5%
Aflac, Inc.		10,102		449,236
American International Group, Inc.		23,772		900,008
Arthur J Gallagher & Co.		7,902		977,556
Athene Holding Ltd. Class A (a)		8,435		363,886
Berkshire Hathaway, Inc. Class B (a)		12,680		2,940,112
Brown & Brown, Inc.		10,963		519,756
Fidelity National Financial, Inc.		31,957		1,249,199
Globe Life, Inc.		2,586		245,567
Lincoln National Corp.		9,840		495,050
Marsh & McLennan Cos., Inc.		10,029		1,173,393
MetLife, Inc.		20,503		962,616
The Progressive Corp.		14,652		1,448,790

MassMutual Premier Disciplined Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Prudential Financial, Inc.		11,419	$	891,481
				12,616,650
Private Equity — 1.1%
The Blackstone Group, Inc. Class A		14,931		967,678
Real Estate Investment Trusts (REITS) — 0.9%
AGNC Investment Corp.		30,610		477,516
Apartment Income REIT Corp. (a)		167		6,414
Apartment Investment and Management Co. Class A		167		882
Gaming and Leisure Properties, Inc.		22		933
VEREIT, Inc.		10,032		379,109
				864,854
				21,364,992
Industrial — 14.5%
Aerospace & Defense — 3.8%
General Dynamics Corp.		3,280		488,130
L3 Harris Technologies, Inc.		12,050		2,277,691
Raytheon Technologies Corp.		11,355		811,996
				3,577,817
Electrical Components & Equipment — 0.6%
Emerson Electric Co.		6,912		555,517
Electronics — 4.9%
Arrow Electronics, Inc. (a)		7,082		689,079
FLIR Systems, Inc.		4,449		195,000
Garmin Ltd.		5,656		676,797
Keysight Technologies, Inc. (a)		4,512		595,990
PerkinElmer, Inc.		6,028		865,018
Roper Technologies, Inc.		2,140		922,532
Trimble, Inc. (a)		9,429		629,574
				4,573,990
Hand & Machine Tools — 0.5%
Snap-on, Inc.		2,788		477,138
Machinery – Diversified — 1.1%
Rockwell Automation, Inc.		1,182		296,457
Westinghouse Air Brake Technologies Corp.		10,163		743,932
				1,040,389
Miscellaneous - Manufacturing — 0.8%
3M Co.		4,449		777,641
Transportation — 2.8%
C.H. Robinson Worldwide, Inc.		2,839		266,497
Expeditors International of Washington, Inc.		5,651		537,467
J.B. Hunt Transport Services, Inc.		4,067		555,756
Knight-Swift Transportation Holdings, Inc.		9,097		380,436

MassMutual Premier Disciplined Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
United Parcel Service, Inc. Class B		5,116	$	861,534
				2,601,690
				13,604,182
Technology — 14.4%
Computers — 3.7%
Accenture PLC Class A		7,000		1,828,470
Dell Technologies C (a)		11,167		818,429
International Business Machines Corp.		6,743		848,809
				3,495,708
Semiconductors — 5.8%
Intel Corp.		47,044		2,343,732
KLA Corp.		3,972		1,028,390
Micron Technology, Inc. (a)		20,220		1,520,140
Qorvo, Inc. (a)		3,051		507,290
				5,399,552
Software — 4.9%
Black Knight, Inc. (a)		7,799		689,042
Fidelity National Information Services, Inc.		11,996		1,696,954
Oracle Corp.		15,312		990,533
Paychex, Inc.		8,403		782,992
SS&C Technologies Holdings, Inc		5,488		399,252
				4,558,773
				13,454,033
Utilities — 0.3%
Electric — 0.3%
CenterPoint Energy, Inc.		11,785		255,027
TOTAL COMMON STOCK (Cost $88,573,983)				92,429,711
TOTAL EQUITIES (Cost $88,573,983)				92,429,711
TOTAL LONG-TERM INVESTMENTS (Cost $88,573,983)				92,429,711

	Principal Amount
Short-Term Investments — 1.1%
Repurchase Agreement — 1.1%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (b)	$	1,016,093		1,016,093
TOTAL SHORT-TERM INVESTMENTS (Cost $1,016,093)				1,016,093
TOTAL INVESTMENTS — 100.1% (Cost $89,590,076) (c)				93,445,804
Other Assets/(Liabilities) — (0.1)%				(75,357	)
NET ASSETS — 100.0%			$	93,370,447

Notes to Portfolio of Investments 

Percentages are stated as a percent of net assets. 

(a) Non-income producing security.

(b) Maturity value of $1,016,093. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $1,036,493.

(c) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Main Street Fund —  Portfolio of Investments

December 31, 2020 (Unaudited) 

	Number of Shares		Value
Equities — 96.9%
Common Stock — 96.9%
Basic Materials — 0.5%
Chemicals — 0.5%
Valvoline, Inc.		27,736	$	641,811
Communications — 16.1%
Internet — 11.8%
Airbnb, Inc.Class A (a)		2,116		310,629
Amazon.com, Inc. (a)		2,310		7,523,508
Booking Holdings, Inc. (a)		867		1,931,043
Facebook, Inc. Class A (a)		14,705		4,016,818
Snap, Inc. Class A (a)		16,572		829,760
				14,611,758
Media — 1.0%
Comcast Corp. Class A		23,805		1,247,382
Telecommunications — 3.3%
Motorola Solutions, Inc.		9,051		1,539,213
Verizon Communications, Inc.		42,547		2,499,636
				4,038,849
				19,897,989
Consumer, Cyclical — 6.5%
Auto Manufacturers — 0.8%
General Motors Co.		21,962		914,498
Entertainment — 0.5%
Live Nation Entertainment, Inc. (a)		4,193		308,102
Warner Music Group Corp. Class A		8,772		333,248
				641,350
Home Builders — 0.7%
D.R. Horton, Inc.		13,105		903,196
Retail — 4.5%
CarMax, Inc. (a)		8,105		765,598
The Home Depot, Inc.		8,655		2,298,941
O'Reilly Automotive, Inc. (a)		1,982		896,994
Target Corp.		8,628		1,523,101
				5,484,634
				7,943,678

MassMutual Premier Main Street Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Consumer, Non-cyclical — 21.3%
Beverages — 1.2%
Constellation Brands, Inc. Class A		6,889	$	1,509,035
Cosmetics & Personal Care — 2.5%
The Procter & Gamble Co.		21,775		3,029,774
Foods — 2.3%
a2 Milk Co. Ltd. (a) (b)		17,978		158,817
Mondelez International, Inc. Class A		23,443		1,370,712
Sysco Corp.		17,047		1,265,910
				2,795,439
Health Care – Products — 2.6%
Alcon, Inc. (a)		9,103		600,616
Avantor, Inc. (a)		18,929		532,851
Thermo Fisher Scientific, Inc.		4,487		2,089,955
				3,223,422
Health Care – Services — 5.6%
HCA Healthcare, Inc.		16,938		2,785,623
UnitedHealth Group, Inc.		11,685		4,097,696
				6,883,319
Household Products & Wares — 0.4%
Reckitt Benckiser Group PLC		5,882		526,061
Pharmaceuticals — 6.7%
AstraZeneca PLC Sponsored ADR (b)		45,580		2,278,544
CVS Health Corp.		22,922		1,565,573
Eli Lilly and Co.		10,534		1,778,560
Merck & Co., Inc.		27,377		2,239,439
Neurocrine Biosciences, Inc. (a)		4,422		423,849
				8,285,965
				26,253,015
Energy — 2.2%
Oil & Gas — 1.0%
Cabot Oil & Gas Corp.		31,581		514,139
Valero Energy Corp.		13,590		768,786
				1,282,925
Pipelines — 1.2%
Magellan Midstream Partners LP (c)		34,087		1,446,652
				2,729,577
Financial — 15.6%
Banks — 3.2%
JP Morgan Chase & Co.		30,748		3,907,148
Diversified Financial Services — 6.4%
Capital One Financial Corp.		22,499		2,224,026

MassMutual Premier Main Street Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Intercontinental Exchange, Inc.		20,933	$	2,413,366
Mastercard, Inc. Class A		5,857		2,090,598
Rocket Cos., Inc. (a) (b)		61,355		1,240,598
				7,968,588
Insurance — 3.6%
Equitable Holdings, Inc.		88,574		2,266,609
The Progressive Corp.		21,566		2,132,446
				4,399,055
Real Estate Investment Trusts (REITS) — 2.4%
Prologis, Inc.		29,414		2,931,399
				19,206,190
Industrial — 10.0%
Aerospace & Defense — 1.5%
Lockheed Martin Corp.		5,227		1,855,481
Building Materials — 0.8%
Vulcan Materials Co.		6,798		1,008,211
Electronics — 1.4%
Honeywell International, Inc.		6,603		1,404,458
Hubbell, Inc.		1,943		304,643
				1,709,101
Environmental Controls — 0.9%
Waste Connections, Inc.		10,575		1,084,678
Machinery – Construction & Mining — 0.9%
Caterpillar, Inc.		5,761		1,048,617
Machinery – Diversified — 1.2%
Otis Worldwide Corp.		11,242		759,397
Rockwell Automation, Inc.		3,022		757,948
				1,517,345
Transportation — 3.3%
C.H. Robinson Worldwide, Inc.		5,278		495,446
Union Pacific Corp.		9,170		1,909,377
United Parcel Service, Inc. Class B		10,125		1,705,050
				4,109,873
				12,333,306
Technology — 23.6%
Computers — 4.0%
Accenture PLC Class A		7,358		1,921,983
Amdocs Ltd.		11,116		788,458
Apple, Inc.		16,689		2,214,463
				4,924,904

MassMutual Premier Main Street Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Semiconductors — 8.1%
Applied Materials, Inc.		39,201	$	3,383,046
QUALCOMM, Inc.		29,394		4,477,882
Texas Instruments, Inc.		13,322		2,186,540
				10,047,468
Software — 11.5%
Adobe, Inc. (a)		1,349		674,662
Fiserv, Inc. (a)		15,735		1,791,587
Microsoft Corp.		42,625		9,480,653
Snowflake, Inc. Class A (a)		662		186,287
Workday, Inc. Class A (a)		4,020		963,232
Zynga, Inc. Class A (a)		108,223		1,068,161
				14,164,582
				29,136,954
Utilities — 1.1%
Electric — 1.1%
Duke Energy Corp.		7,037		644,308
FirstEnergy Corp.		24,720		756,679
				1,400,987
TOTAL COMMON STOCK (Cost $89,627,071)				119,543,507
TOTAL EQUITIES (Cost $89,627,071)				119,543,507
TOTAL LONG-TERM INVESTMENTS (Cost $89,627,071)				119,543,507

	Principal Amount
Short-Term Investments — 0.8%
Repurchase Agreement — 0.8%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (d)	$	1,014,861		1,014,861
TOTAL SHORT-TERM INVESTMENTS  (Cost $1,014,861)				1,014,861
TOTAL INVESTMENTS — 97.7% (Cost $90,641,932) (e)				120,558,368
Other Assets/(Liabilities) — 2.3%				2,824,461
NET ASSETS — 100.0%			$	123,382,829

Abbreviation Legend 

ADR      American Depositary Receipt

Notes to Portfolio of Investments 

Percentages are stated as a percent of net assets. 

(a) Non-income producing security.

(b) Denotes all or a portion of security on loan. The total value of securities on loan as of December 31, 2020, was $3,471,750 or 2.81% of net assets. Total securities on loan may be less than the amounts identified in the Portfolio of Investments. The Fund received $3,626,022 of non-cash collateral (U.S. Treasury and/or Agency obligations) related to securities lending activity. This amount is not reflected on the Portfolio of Investments. (Note 2).

(c) Security is a Master Limited Partnership.

(d) Maturity value of $1,014,861. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $1,035,195.

(e) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Disciplined Growth Fund —  Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 101.8%
Common Stock — 101.8%
Basic Materials — 1.1%
Chemicals — 0.3%
FMC Corp.		7,696	$	884,501
Mining — 0.8%
Newmont Corp.		34,175		2,046,741
				2,931,242
Communications — 21.8%
Internet — 19.9%
Alphabet, Inc. Class A (a)		4,352		7,627,489
Alphabet, Inc. Class C (a)		4,362		7,641,701
Amazon.com, Inc. (a)		3,843		12,516,382
eBay, Inc.		34,725		1,744,931
Facebook, Inc. Class A (a)		54,584		14,910,165
GoDaddy, Inc. Class A (a)		13,009		1,079,097
Match Group, Inc. (a)		12,322		1,862,963
Netflix, Inc. (a)		11,865		6,415,762
				53,798,490
Media — 1.9%
Altice USA, Inc. Class A (a)		28,429		1,076,606
Charter Communications, Inc. Class A (a)		5,913		3,911,745
				4,988,351
				58,786,841
Consumer, Cyclical — 12.2%
Apparel — 2.0%
NIKE, Inc. Class B		38,194		5,403,305
Auto Manufacturers — 3.7%
Tesla, Inc. (a)		14,042		9,909,018
Home Builders — 0.4%
NVR, Inc. (a)		262		1,068,924
Retail — 6.1%
AutoZone, Inc. (a)		1,326		1,571,893
Costco Wholesale Corp.		10,790		4,065,456
McDonald's Corp.		13,798		2,960,775
Starbucks Corp.		43,226		4,624,318

MassMutual Premier Disciplined Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Walmart, Inc.		23,027	$	3,319,342
				16,541,784
				32,923,031
Consumer, Non-cyclical — 19.8%
Beverages — 0.6%
Monster Beverage Corp. (a)		19,160		1,771,917
Biotechnology — 3.0%
Alexion Pharmaceuticals, Inc. (a)		8,803		1,375,381
Incyte Corp. (a)		27,217		2,367,335
Regeneron Pharmaceuticals, Inc. (a)		4,167		2,013,119
Vertex Pharmaceuticals, Inc. (a)		10,193		2,409,013
				8,164,848
Commercial Services — 7.3%
FleetCor Technologies, Inc. (a)		5,016		1,368,515
Gartner, Inc. (a)		6,843		1,096,180
Global Payments, Inc.		11,270		2,427,784
MarketAxess Holdings, Inc.		2,417		1,379,044
PayPal Holdings, Inc. (a)		30,384		7,115,933
S&P Global, Inc.		7,536		2,477,309
Square, Inc. Class A (a)		17,152		3,732,961
				19,597,726
Health Care – Products — 1.8%
Align Technology, Inc. (a)		3,698		1,976,137
Avantor, Inc. (a)		39,629		1,115,556
Hologic, Inc. (a)		24,761		1,803,344
				4,895,037
Health Care – Services — 5.3%
Anthem, Inc.		4,852		1,557,929
Centene Corp. (a)		22,082		1,325,582
DaVita, Inc. (a)		8,015		940,961
HCA Healthcare, Inc.		12,265		2,017,102
Molina Healthcare, Inc. (a)		4,871		1,035,964
UnitedHealth Group, Inc.		21,098		7,398,647
				14,276,185
Pharmaceuticals — 1.8%
Bristol-Myers Squibb Co.		78,622		4,876,923
				53,582,636
Energy — 0.4%
Pipelines — 0.4%
Cheniere Energy, Inc. (a)		18,879		1,133,306
Financial — 9.8%
Diversified Financial Services — 8.4%
Intercontinental Exchange, Inc.		20,780		2,395,726
Mastercard, Inc. Class A		34,708		12,388,673

MassMutual Premier Disciplined Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Visa, Inc. Class A		36,030	$	7,880,842
				22,665,241
Insurance — 0.4%
Brown & Brown, Inc.		12,005		569,157
Voya Financial, Inc.		9,653		567,693
				1,136,850
Private Equity — 0.5%
The Blackstone Group, Inc. Class A		21,289		1,379,740
Real Estate — 0.5%
CBRE Group, Inc. Class A (a)		22,276		1,397,151
				26,578,982
Industrial — 2.6%
Aerospace & Defense — 2.6%
The Boeing Co.		20,132		4,309,456
Lockheed Martin Corp.		7,477		2,654,185
				6,963,641
Technology — 34.1%
Computers — 6.8%
Apple, Inc.		126,517		16,787,541
Fortinet, Inc. (a)		9,584		1,423,511
				18,211,052
Semiconductors — 11.0%
Advanced Micro Devices, Inc. (a)		47,174		4,326,328
Applied Materials, Inc.		31,662		2,732,431
KLA Corp.		7,359		1,905,319
Lam Research Corp.		5,348		2,525,700
NVIDIA Corp.		22,852		11,933,314
Qorvo, Inc. (a)		5,886		978,665
QUALCOMM, Inc.		34,694		5,285,284
				29,687,041
Software — 16.3%
Adobe, Inc. (a)		21,830		10,917,620
CDK Global, Inc.		10,317		534,730
Datadog, Inc. Class A (a)		6,399		629,918
Dynatrace, Inc. (a)		20,143		871,588
Fiserv, Inc. (a)		20,511		2,335,382
Microsoft Corp.		61,435		13,664,373
MSCI, Inc.		4,065		1,815,144
Paycom Software, Inc. (a)		3,197		1,445,843
salesforce.com, Inc. (a)		23,004		5,119,080
SS&C Technologies Holdings, Inc		33,180		2,413,845

MassMutual Premier Disciplined Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Zoom Video Communications, Inc. Class A (a)		12,916	$	4,356,825
				44,104,348
				92,002,441
TOTAL COMMON STOCK (Cost $210,617,601)				274,902,120
TOTAL EQUITIES (Cost $210,617,601)				274,902,120
TOTAL LONG-TERM INVESTMENTS (Cost $210,617,601)				274,902,120

	Principal Amount
Short-Term Investments — 1.0%
Repurchase Agreement — 1.0%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (b)	$	2,834,817		2,834,817
TOTAL SHORT-TERM INVESTMENTS (Cost $2,834,817)				2,834,817
TOTAL INVESTMENTS — 102.8% (Cost $213,452,418) (c)				277,736,937
Other Assets/(Liabilities) — (2.8)%				(7,663,245	)
NET ASSETS — 100.0%			$	270,073,692

Notes to Portfolio of Investments 

Percentages are stated as a percent of net assets. 

(a) Non-income producing security.

(b) Maturity value of $2,834,817. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $2,891,533.

(c) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Small Cap Opportunities Fund —  Portfolio of Investments

December 31, 2020 (Unaudited) 

	Number of Shares		Value
Equities — 99.1%
Common Stock — 99.1%
Basic Materials — 2.9%
Forest Products & Paper — 0.6%
Schweitzer-Mauduit International, Inc.		43,226	$	1,738,118
Mining — 2.3%
Compass Minerals International, Inc.		50,790		3,134,759
Kaiser Aluminum Corp.		33,303		3,293,667
				6,428,426
				8,166,544
Communications — 2.1%
Internet — 1.7%
Q2 Holdings, Inc. (a) (b)		36,837		4,660,986
Telecommunications — 0.4%
EchoStar Corp. Class A (a)		58,466		1,238,894
				5,899,880
Consumer, Cyclical — 13.0%
Auto Parts & Equipment — 3.0%
Dorman Products, Inc. (a)		36,562		3,174,313
Visteon Corp. (a)		40,127		5,036,741
				8,211,054
Entertainment — 0.5%
Cedar Fair LP (c)		37,324		1,468,326
Retail — 9.5%
AutoNation, Inc. (a)		90,390		6,308,318
Big Lots, Inc. (b)		29,801		1,279,357
BJ's Wholesale Club Holdings, Inc. (a)		93,180		3,473,751
Denny's Corp. (a)		110,080		1,615,974
Foot Locker, Inc.		34,207		1,383,331
Jack in the Box, Inc.		41,344		3,836,723
Ollie's Bargain Outlet Holdings, Inc. (a) (b)		11,545		944,035
Suburban Propane Partners LP (c)		213,135		3,167,186
Texas Roadhouse, Inc.		56,687		4,430,656
				26,439,331
				36,118,711

MassMutual Premier Small Cap Opportunities Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Consumer, Non-cyclical — 26.2%
Biotechnology — 4.8%
ADC Therapeutics SA (a) (b)		22,583	$	722,882
Avid Bioservices, Inc. (a)		19,749		227,903
Axsome Therapeutics, Inc. (a) (b)		12,049		981,632
Emergent BioSolutions, Inc. (a)		43,584		3,905,126
NeoGenomics, Inc. (a)		58,656		3,158,039
Twist Bioscience Corp. (a)		21,493		3,036,746
Zai Lab Ltd. ADR (a)		9,999		1,353,265
				13,385,593
Commercial Services — 5.3%
ASGN, Inc. (a)		75,058		6,269,595
Korn Ferry		123,099		5,354,806
Monro, Inc.		57,862		3,084,045
				14,708,446
Foods — 2.7%
BellRing Brands, Inc. Class A (a)		137,722		3,348,022
The Simply Good Foods Co. (a) (b)		137,094		4,299,268
				7,647,290
Health Care – Products — 6.2%
Adaptive Biotechnologies Corp. (a)		28,966		1,712,760
AtriCure, Inc. (a)		54,032		3,007,961
Inspire Medical Systems, Inc. (a)		18,463		3,472,706
iRhythm Technologies, Inc. (a)		10,593		2,512,765
OraSure Technologies, Inc. (a)		70,323		744,369
Repligen Corp. (a)		10,498		2,011,732
Tandem Diabetes Care, Inc. (a)		39,723		3,800,697
				17,262,990
Health Care – Services — 4.5%
Addus HomeCare Corp. (a)		37,634		4,406,565
LHC Group, Inc. (a)		23,761		5,068,697
Tenet Healthcare Corp. (a)		76,193		3,042,386
				12,517,648
Household Products & Wares — 1.5%
Acco Brands Corp.		489,393		4,135,371
Pharmaceuticals — 1.2%
Collegium Pharmaceutical, Inc. (a)		66,303		1,328,049
G1 Therapeutics, Inc. (a) (b)		63,995		1,151,270
uniQure NV (a)		24,156		872,756
				3,352,075
				73,009,413
Diversified — 0.3%
Holding Company – Diversified — 0.3%
Social Capital Hedosophia Holdings Corp. III Class A (a)		52,681		883,460

MassMutual Premier Small Cap Opportunities Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Energy — 3.4%
Energy – Alternate Sources — 2.3%
Renewable Energy Group, Inc. (a)		92,179	$	6,528,117
Oil & Gas — 0.6%
CNX Resources Corp. (a)		151,081		1,631,675
Pipelines — 0.5%
Noble Midstream Partners LP (c)		128,875		1,342,877
				9,502,669
Financial — 20.1%
Banks — 5.5%
The Bank of NT Butterfield & Son Ltd.		98,088		3,056,422
BankUnited, Inc.		102,098		3,550,969
Cathay General Bancorp		72,495		2,333,614
CIT Group, Inc.		71,482		2,566,204
Heritage Financial Corp.		89,572		2,095,089
Signature Bank		11,577		1,566,252
				15,168,550
Diversified Financial Services — 3.1%
Federated Hermes, Inc.		62,120		1,794,647
Focus Financial Partners, Inc. Class A (a)		66,624		2,898,144
Stifel Financial Corp.		79,986		4,036,093
				8,728,884
Insurance — 0.3%
Selectquote, Inc. (a) (b)		41,997		871,438
Real Estate Investment Trusts (REITS) — 5.8%
Brandywine Realty Trust		220,173		2,622,260
DiamondRock Hospitality Co.		429,780		3,545,685
EPR Properties		82,523		2,681,998
Four Corners Property Trust, Inc.		153,732		4,576,602
National Storage Affiliates Trust		76,841		2,768,581
				16,195,126
Savings & Loans — 5.4%
Berkshire Hills Bancorp, Inc.		89,048		1,524,501
OceanFirst Financial Corp.		106,757		1,988,883
Pacific Premier Bancorp, Inc.		108,218		3,390,470
Sterling Bancorp		136,203		2,448,930
WSFS Financial Corp.		123,517		5,543,443
				14,896,227
				55,860,225
Industrial — 15.2%
Building Materials — 1.9%
Masonite International Corp. (a)		29,791		2,929,647

MassMutual Premier Small Cap Opportunities Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Summit Materials, Inc. Class A (a)		123,024	$	2,470,322
				5,399,969
Electrical Components & Equipment — 1.9%
Energizer Holdings, Inc.		61,254		2,583,694
EnerSys		30,895		2,566,138
				5,149,832
Electronics — 1.1%
Atkore International Group, Inc. (a)		75,541		3,105,490
Engineering & Construction — 3.5%
Comfort Systems USA, Inc.		26,242		1,381,904
KBR, Inc.		156,852		4,851,432
TopBuild Corp. (a)		19,288		3,550,535
				9,783,871
Environmental Controls — 0.4%
US Ecology, Inc.		32,758		1,190,098
Machinery – Diversified — 1.1%
Chart Industries, Inc. (a)		25,877		3,048,052
Metal Fabricate & Hardware — 2.7%
Rexnord Corp.		142,119		5,612,280
Valmont Industries, Inc.		10,497		1,836,240
				7,448,520
Miscellaneous - Manufacturing — 1.1%
EnPro Industries, Inc.		40,305		3,043,834
Transportation — 1.5%
CryoPort, Inc. (a) (b)		55,069		2,416,428
Hub Group, Inc. Class A (a)		29,223		1,665,711
				4,082,139
				42,251,805
Technology — 12.8%
Computers — 2.5%
CACI International, Inc. Class A (a)		15,194		3,788,320
Perspecta, Inc.		134,441		3,237,339
				7,025,659
Semiconductors — 4.8%
Allegro MicroSystems, Inc. (a)		35,518		946,910
Brooks Automation, Inc.		57,328		3,889,705
MKS Instruments, Inc.		30,924		4,652,516
Semtech Corp. (a)		51,536		3,715,230
				13,204,361
Software — 5.5%
1Life Healthcare, Inc. (a) (b)		49,510		2,161,111
Bottomline Technologies de, Inc. (a)		79,745		4,205,751

MassMutual Premier Small Cap Opportunities Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Envestnet, Inc. (a)		24,816	$	2,042,109
Everbridge, Inc. (a)		10,783		1,607,422
j2 Global, Inc. (a)		53,789		5,254,647
				15,271,040
				35,501,060
Utilities — 3.1%
Electric — 2.1%
Avista Corp.		63,950		2,566,953
Evoqua Water Technologies Corp. (a)		119,916		3,235,334
				5,802,287
Gas — 1.0%
National Fuel Gas Co.		42,816		1,761,022
South Jersey Industries, Inc.		52,942		1,140,900
				2,901,922
				8,704,209
TOTAL COMMON STOCK (Cost $221,368,875)				275,897,976
TOTAL EQUITIES (Cost $221,368,875)				275,897,976
Mutual Funds — 1.0%
Diversified Financial Services — 1.0%
State Street Navigator Securities Lending Prime Portfolio (d)		2,680,152		2,680,152
TOTAL MUTUAL FUNDS (Cost $2,680,152)				2,680,152
TOTAL LONG-TERM INVESTMENTS (Cost $224,049,027)				278,578,128

	Principal Amount
Short-Term Investments — 1.0%
Repurchase Agreement — 1.0%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (e)	$	2,846,456		2,846,456
TOTAL SHORT-TERM INVESTMENTS (Cost $2,846,456)				2,846,456
TOTAL INVESTMENTS — 101.1% (Cost $226,895,483) (f)				281,424,584
Other Assets/(Liabilities) — (1.1)%				(3,016,927	)
NET ASSETS — 100.0%			$	278,407,657

MassMutual Premier Small Cap Opportunities Fund —  Portfolio of Investments (Continued)

Abbreviation Legend 

ADR     American Depositary Receipt 

Notes to Portfolio of Investments 

Percentages are stated as a percent of net assets. 

(a) Non-income producing security.

(b) Denotes all or a portion of security on loan. The total value of securities on loan as of December 31, 2020, was $17,784,851 or 6.39% of net assets. Total securities on loan may be less than the amounts identified in the Portfolio of Investments. The Fund received $15,469,683 of non-cash collateral (U.S. Treasury and/or Agency obligations) related to securities lending activity. This amount is not reflected on the Portfolio of Investments. (Note 2).

(c) Security is a Master Limited Partnership.

(d) Represents investment of security lending cash collateral. (Note 2).

(e) Maturity value of $2,846,456. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $2,903,419.

(f) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Global Fund — Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 99.2%
Common Stock — 99.2%
Cayman Islands — 6.9%
Farfetch Ltd. Class A (a)		87,922	$	5,610,303
JD.com, Inc. ADR (a)		173,249		15,228,587
StoneCo Ltd. Class A (a)		48,169		4,042,342
				24,881,232
Denmark — 0.1%
Ascendis Pharma A/S ADR (a)		1,474		245,834
France — 8.0%
Dassault Systemes SE		5,014		1,018,560
Kering SA		12,895		9,374,635
LVMH Moet Hennessy Louis Vuitton SE		29,247		18,274,424
				28,667,619
Germany — 2.5%
SAP SE		67,620		8,885,845
India — 3.1%
DLF Ltd.		1,978,259		6,304,688
ICICI Bank Ltd. Sponsored ADR (a)		334,733		4,974,132
				11,278,820
Italy — 0.3%
Brunello Cucinelli SpA (a) (b)		21,739		943,808
Japan — 16.5%
Capcom Co. Ltd.		80,300		5,220,763
FANUC Corp.		16,800		4,136,451
Keyence Corp.		18,400		10,355,194
MinebeaMitsumi, Inc.		3,000		59,685
Murata Manufacturing Co. Ltd.		121,730		10,963,143
Nidec Corp.		107,400		13,531,856
Omron Corp.		63,100		5,631,508
Takeda Pharmaceutical Co. Ltd.		73,708		2,672,037
TDK Corp.		44,600		6,726,966
				59,297,603
Netherlands — 3.5%
Airbus SE (a)		87,984		9,664,991
ASML Holding NV		3,574		1,727,178
uniQure NV (a)		29,014		1,048,276
				12,440,445

MassMutual Premier Global Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Spain — 1.2%
Industria de Diseno Textil SA		135,606	$	4,317,956
Sweden — 2.8%
Assa Abloy AB Class B		180,000		4,427,358
Atlas Copco AB Class A		112,442		5,750,368
				10,177,726
Switzerland — 0.4%
Zur Rose Group AG (a)		4,859		1,552,216
United Kingdom — 1.1%
Prudential PLC		217,252		4,010,089
United States — 52.8%
Adobe, Inc. (a)		32,524		16,265,903
Agilent Technologies, Inc.		52,206		6,185,889
Alphabet, Inc. Class A (a)		17,293		30,308,404
Amazon.com, Inc. (a)		1,498		4,878,881
Analog Devices, Inc.		4,898		723,582
Anthem, Inc.		4,121		1,323,212
Avantor, Inc. (a)		165,174		4,649,648
Blueprint Medicines Corp. (a)		18,727		2,100,233
Boston Scientific Corp. (a)		47,112		1,693,676
Castle Biosciences, Inc. (a)		11,435		767,860
Centene Corp. (a)		19,647		1,179,409
Charles River Laboratories International, Inc. (a)		2,035		508,465
Colgate-Palmolive Co.		20,581		1,759,881
Dun & Bradstreet Holdings, Inc. (a)		19,749		491,750
Electronic Arts, Inc.		22,198		3,187,633
Equifax, Inc.		29,464		5,681,838
Facebook, Inc. Class A (a)		57,651		15,747,947
Fidelity National Information Services, Inc.		29,006		4,103,189
Illumina, Inc. (a)		6,289		2,326,930
Intuit, Inc.		38,942		14,792,119
Ionis Pharmaceuticals, Inc. (a)		34,878		1,972,002
IQVIA Holdings, Inc. (a)		7,218		1,293,249
MacroGenics, Inc. (a)		45,834		1,047,765
Maxim Integrated Products, Inc.		109,441		9,701,945
Microsoft Corp.		16,082		3,576,959
Nuance Communications, Inc. (a)		25,050		1,104,455
PayPal Holdings, Inc. (a)		44,702		10,469,208
Pegasystems, Inc.		16,612		2,213,715
Phathom Pharmaceuticals, Inc. (a) (b)		31,588		1,049,353
S&P Global, Inc.		42,729		14,046,304
Sage Therapeutics, Inc. (a)		12,675		1,096,514
Sarepta Therapeutics, Inc. (a)		14,719		2,509,442
Twist Bioscience Corp. (a)		1,652		233,411
United Parcel Service, Inc. Class B		35,518		5,981,231
Veracyte, Inc. (a)		41,817		2,046,524
Visa, Inc. Class A		17,298		3,783,592
The Walt Disney Co. (a)		40,700		7,374,026
Zimmer Biomet Holdings, Inc.		6,961		1,072,621
				189,248,765
TOTAL COMMON STOCK (Cost $155,175,775)				355,947,958

MassMutual Premier Global Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Preferred Stock — 0.0%
India — 0.0%
Zee Entertainment Enterprises Ltd. 6.000%		573,050	$	31,214
TOTAL PREFERRED STOCK (Cost $22,480)				31,214
TOTAL EQUITIES (Cost $155,198,255)				355,979,172
TOTAL LONG-TERM INVESTMENTS (Cost $155,198,255)				355,979,172
	Principal Amount
Short-Term Investments — 1.3%
Repurchase Agreement — 1.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (c)	$	4,515,473		4,515,473
TOTAL SHORT-TERM INVESTMENTS (Cost $4,515,473)				4,515,473
TOTAL INVESTMENTS — 100.5% (Cost $159,713,728) (d)				360,494,645
Other Assets/(Liabilities) — (0.5)%				(1,866,714	)
NET ASSETS — 100.0%			$	358,627,931

Abbreviation Legend

ADR American Depositary Receipt

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Non-income producing security.

(b) Denotes all or a portion of security on loan. The total value of securities on loan as of December 31, 2020, was $1,895,027 or 0.53% of net assets. Total securities on loan may be less than the amounts identified in the Portfolio of Investments. The Fund received $2,004,085 of non-cash collateral (U.S. Treasury and/or Agency obligations) related to securities lending activity. This amount is not reflected on the Portfolio of Investments. (Note 2).

(c) Maturity value of $4,515,473. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $4,605,837.

(d) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier International Equity Fund —  Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 95.8%
Common Stock — 95.8%
Australia — 0.9%
Challenger Ltd.		64,000	$	318,116
Lendlease Corp Ltd.		32,000		323,512
Macquarie Group Ltd.		5,400		577,004
Santos Ltd.		74,500		360,297
				1,578,929
Belgium — 0.5%
Groupe Bruxelles Lambert SA		4,200		423,811
KBC Group NV (a)		7,600		532,663
				956,474
Canada — 5.1%
The Bank of Nova Scotia (b)		39,518		2,135,940
Canadian National Railway Co.		35,231		3,873,224
Intact Financial Corp.		28,164		3,334,809
				9,343,973
Cayman Islands — 0.5%
CK Asset Holdings Ltd.		63,500		326,618
CK Hutchison Holdings Ltd.		88,200		615,920
				942,538
Denmark — 0.2%
AP Moller - Maersk A/S Class B		190		423,687
France — 10.6%
Arkema SA		4,000		457,212
AXA SA		99,613		2,389,803
Capgemini SE		16,229		2,516,649
Dassault Aviation SA (a)		160		175,521
Engie SA (a)		52,400		802,309
LVMH Moet Hennessy Louis Vuitton SE		2,166		1,353,383
Rexel SA (a)		17,400		274,374
Sanofi		8,000		772,964
Schneider Electric SE		17,865		2,584,092
TOTAL SE		58,182		2,509,860
Ubisoft Entertainment SA (a)		3,800		366,158
Veolia Environnement SA		26,500		648,335
Vinci SA		42,387		4,217,566
Vivendi SA		9,100		293,462
				19,361,688

MassMutual Premier International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Germany — 4.3%
Allianz SE Registered		2,360	$	577,426
Bayer AG Registered		4,700		276,255
Deutsche Boerse AG		3,180		539,870
Deutsche Post AG Registered		9,900		489,928
Fresenius SE & Co. KGaA		15,500		716,225
HeidelbergCement AG		10,500		785,430
Infineon Technologies AG		14,900		571,812
Merck KGaA		10,326		1,770,016
SAP SE		5,200		683,324
Siemens AG Registered		6,560		938,910
Siemens Energy AG (a)		7,980		292,873
Talanx AG (a)		4,500		174,304
				7,816,373
Hong Kong — 3.1%
AIA Group Ltd.		456,528		5,623,360
Ireland — 3.6%
AIB Group PLC (a) (b)		103,900		213,737
DCC PLC		6,800		483,345
Linde PLC (a)		17,604		4,571,826
Linde PLC		1,270		334,658
Ryanair Holdings PLC Sponsored ADR (a)		1,800		197,964
Smurfit Kappa Group PLC		14,900		692,992
				6,494,522
Israel — 0.2%
Check Point Software Technologies Ltd. (a)		2,490		330,946
Italy — 0.4%
Mediobanca Banca di Credito Finanziario SpA		43,400		396,655
Prysmian SpA		7,600		270,939
UniCredit SpA (a)		9,700		89,762
				757,356
Japan — 19.5%
Astellas Pharma, Inc.		313,860		4,852,111
Chugai Pharmaceutical Co. Ltd.		38,970		2,080,565
Denka Co. Ltd.		10,700		418,352
FANUC Corp.		2,600		640,165
Fujitsu Ltd.		2,800		405,337
Hitachi Ltd.		20,200		797,080
Japan Airlines Co. Ltd. (a)		16,300		315,795
Kao Corp.		50,890		3,934,555
KDDI Corp.		152,820		4,538,356
Kirin Holdings Co. Ltd. (b)		135,220		3,192,608
Kyocera Corp.		7,500		460,326
Matsumotokiyoshi Holdings Co. Ltd.		5,200		221,948
Nintendo Co. Ltd.		1,100		702,008
Olympus Corp.		30,700		672,027
ORIX Corp.		45,900		712,324
Rakuten, Inc. (a) (b)		62,200		597,385
Sega Sammy Holdings, Inc.		33,800		533,393
Seven & i Holdings Co. Ltd.		23,400		830,971
Shiseido Co. Ltd.		55,570		3,854,705

MassMutual Premier International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Sony Corp.		15,900	$	1,598,645
Square Enix Holdings Co. Ltd.		7,300		442,980
Sumitomo Mitsui Financial Group, Inc.		22,500		696,220
Sysmex Corp.		13,070		1,571,855
Toshiba Corp.		19,900		557,275
Toyota Industries Corp.		12,400		985,611
				35,612,597
Luxembourg — 0.3%
ArcelorMittal SA (a)		26,400		605,842
Netherlands — 6.4%
Airbus SE (a)		900		98,864
ASML Holding NV		1,290		623,408
EXOR NV		2,600		208,695
Heineken Holding NV		7,300		687,621
Heineken NV (b)		45,600		5,085,304
Koninklijke Philips NV (a)		82,880		4,435,436
NXP Semiconductor NV		2,600		413,426
				11,552,754
Norway — 0.3%
Mowi ASA		21,800		485,539
Singapore — 0.3%
DBS Group Holdings, Ltd.		32,100		607,168
Spain — 3.9%
Iberdrola SA		236,570		3,383,318
Industria de Diseno Textil SA (b)		107,875		3,434,948
Siemens Gamesa Renewable Energy SA		6,600		267,934
				7,086,200
Sweden — 2.2%
Assa Abloy AB Class B		127,501		3,136,070
Investor AB Class B		6,400		467,758
Lundin Energy AB		2,800		75,609
Volvo AB Class B (a)		16,100		378,870
				4,058,307
Switzerland — 11.1%
ABB Ltd. Registered		24,800		693,689
Alcon, Inc. (a)		7,600		507,373
Nestle SA Registered		42,900		5,050,569
Novartis AG Registered		61,479		5,806,741
Roche Holding AG		14,472		5,049,395
Temenos Group AG Registered		15,556		2,170,608
UBS Group AG Registered		61,700		862,963
				20,141,338
United Kingdom — 22.4%
Ashtead Group PLC		11,000		517,646
AstraZeneca PLC		28,419		2,839,313
Aviva PLC		136,800		613,573
BAE Systems PLC		455,385		3,045,724

MassMutual Premier International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Barratt Developments PLC (a)		16,500	$	151,373
BHP Group PLC ADR		3,200		169,696
The British Land Co. PLC		73,900		494,546
Bunzl PLC		8,300		277,441
Compass Group PLC		141,623		2,642,744
Diageo PLC		106,512		4,209,472
Entain PLC (a)		31,700		492,066
Experian PLC		58,149		2,215,769
Glencore PLC (a)		56,100		178,953
Imperial Brands PLC		19,000		399,216
Inchcape PLC (a)		50,400		443,978
Informa PLC (a)		28,000		210,406
Kingfisher PLC (a)		8,700		32,193
Liberty Global PLC Class C (a)		18,000		425,700
National Grid PLC		310,894		3,702,929
Persimmon PLC		11,700		443,178
Prudential PLC		113,173		2,088,974
Reckitt Benckiser Group PLC		50,713		4,535,552
Smith & Nephew PLC		239,609		5,003,515
Tesco PLC		239,400		755,823
Unilever PLC		16,100		969,178
Unilever PLC		65,821		3,985,533
				40,844,491
TOTAL COMMON STOCK (Cost $156,991,468)				174,624,082
TOTAL EQUITIES (Cost $156,991,468)				174,624,082
Mutual Funds — 6.0%
United States — 6.0%
State Street Navigator Securities Lending Prime Portfolio (c)		10,872,481		10,872,481
TOTAL MUTUAL FUNDS (Cost $10,872,481)				10,872,481
TOTAL LONG-TERM INVESTMENTS (Cost $167,863,949)				185,496,563

	Principal Amount
Short-Term Investments — 1.9%
Repurchase Agreement — 1.9%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (d)	$	3,554,193		3,554,193
TOTAL SHORT-TERM INVESTMENTS (Cost $3,554,193)				3,554,193
TOTAL INVESTMENTS — 103.7% (Cost $171,418,142) (e)				189,050,756
Other Assets/(Liabilities) — (3.7)%				(6,777,206	)
NET ASSETS — 100.0%			$	182,273,550

MassMutual Premier International Equity Fund —  Portfolio of Investments (Continued)

Abbreviation Legend
ADR	American Depositary Receipt

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Non-income producing security.

(b) Denotes all or a portion of security on loan. The total value of securities on loan as of December 31, 2020, was $14,375,950 or 7.89% of net assets. Total securities on loan may be less than the amounts identified in the Portfolio of Investments. The Fund received $4,255,640 of non-cash collateral (U.S. Treasury and/or Agency obligations) related to securities lending activity. This amount is not reflected on the Portfolio of Investments. (Note 2).

(c) Represents investment of security lending cash collateral. (Note 2).

(d) Maturity value of $3,554,193. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $3,625,279.

(e) See Note 3 for aggregate cost for federal tax purposes.

MassMutual Premier Strategic Emerging Markets Fund — Portfolio of Investments

December 31, 2020 (Unaudited)

	Number of Shares		Value
Equities — 97.8%
Common Stock — 95.0%
Belgium — 1.0%
Anheuser-Busch InBev SA		29,951	$	2,093,051
Bermuda — 1.6%
Credicorp Ltd.		11,178		1,833,416
Jardine Strategic Holdings Ltd.		58,371		1,452,533
				3,285,949
Brazil — 3.3%
Ambev SA		345,039		1,042,635
B3 SA - Brasil Bolsa Balcao		148,726		1,783,959
Vale SA Sponsored ADR		229,986		3,854,565
				6,681,159
Cayman Islands — 23.3%
Alibaba Group Holding Ltd. Sponsored ADR  (a)		28,769		6,695,409
Alibaba Group Holding Ltd. (a)		11,200		327,237
Blue Moon Group Holdings Ltd. (a) (b)		119,960		236,130
Budweiser Brewing Co. APAC Ltd. (b)		429,800		1,420,828
Hansoh Pharmaceutical Group Co. Ltd. (a) (b)		138,000		671,142
Huazhu Group Ltd. ADR		133,265		6,000,923
Innovent Biologics, Inc. (a) (b)		117,000		1,242,672
Meituan Class B  (a)		41,400		1,583,398
NetEase, Inc. ADR		787		75,371
New Oriental Education & Technology Group, Inc. Sponsored ADR (a)		5,634		1,046,854
OneConnect Financial Technology Co. Ltd. (a)		78,163		1,540,593
Pagseguro Digital Ltd. Class A (a)		40,636		2,311,376
Pinduoduo, Inc. ADR  (a)		21,649		3,846,378
Tencent Holdings Ltd.		192,690		14,079,324
Wuxi Biologics Cayman, Inc. (a) (b)		86,000		1,145,525
ZTO Express Cayman, Inc. (a)		9,320		272,629
ZTO Express Cayman, Inc. ADR		141,498		4,126,082
				46,621,871
Chile — 0.8%
Falabella SA		403,687		1,499,806
China — 4.6%
Jiangsu Hengrui Medicine Co. Ltd. Class A		261,638		4,469,520
Ping An Insurance Group Co. of China Ltd. Class A		333,971		4,443,687
Remegen Co. Ltd. (a) (b)		21,231		260,169
				9,173,376

MassMutual Premier Strategic Emerging Markets Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Colombia — 0.4%
Grupo Aval Acciones y Valores SA (c)		117,311	$	807,100
Egypt — 0.7%
Commercial International Bank Egypt SAE		344,285		1,295,734
France — 5.3%
Kering SA		12,438		9,042,397
LVMH Moet Hennessy Louis Vuitton SE		148		92,475
Pernod Ricard SA		7,139		1,368,462
				10,503,334
Hong Kong — 3.9%
AIA Group Ltd.		639,000		7,870,989
India — 14.3%
HDFC Bank Ltd. (a)		91,878		1,812,518
Housing Development Finance Corp. Ltd.		280,646		9,861,993
Infosys Ltd.		126,099		2,165,360
Kotak Mahindra Bank Ltd. (a)		289,524		7,922,533
Oberoi Realty Ltd. (a)		109,294		869,102
Tata Consultancy Services Ltd.		123,416		4,846,989
Zee Entertainment Enterprises Ltd.		353,109		1,085,487
				28,563,982
Indonesia — 1.2%
Bank Central Asia Tbk PT		650,200		1,566,618
Indocement Tunggal Prakarsa Tbk PT		433,935		447,708
Semen Indonesia Persero Tbk PT		499,200		442,359
				2,456,685
Italy — 2.0%
Moncler SpA (a)		10,936		668,913
PRADA SpA (a)		510,700		3,377,598
				4,046,511
Luxembourg — 0.1%
Allegro.eu SA (a) (b)		10,167		231,027
Mexico — 5.6%
Alsea SAB de CV (a)		311,928		404,576
Fomento Economico Mexicano SAB de CV		470,519		3,568,705
Fomento Economico Mexicano SAB de CV Sponsored ADR		13,392		1,014,712
Grupo Aeroportuario del Sureste SAB de CV Class B (a)		52,078		863,077
Grupo Financiero Inbursa SAB de CV Class O (a)		669,048		673,099
Grupo Mexico SAB de CV Series B		964,495		4,090,240
Wal-Mart de Mexico SAB de CV		176,100		494,685
				11,109,094
Netherlands — 3.2%
Yandex NV Class A (a)		91,415		6,360,656
Philippines — 2.6%
Ayala Land, Inc.		2,017,900		1,718,621
SM Investments Corp.		118,565		2,593,572

MassMutual Premier Strategic Emerging Markets Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
SM Prime Holdings, Inc.		1,045,057	$	837,945
				5,150,138
Republic of Korea — 1.7%
AMOREPACIFIC Group		6,511		329,325
Samsung Biologics Co. Ltd. (a) (b)		3,911		2,968,196
				3,297,521
Russia — 4.3%
Novatek PJSC Sponsored GDR Registered (b)		35,732		5,797,266
Novatek PJSC Sponsored GDR Registered (b)		5,913		966,184
Polyus PJSC (a)		2,636		543,900
Polyus PJSC GDR (b) (d)		457		46,066
Polyus PJSC GDR (b) (d)		5,075		511,560
Sberbank of Russia PJSC		203,249		744,844
				8,609,820
South Africa — 0.6%
FirstRand Ltd.		353,930		1,234,192
Switzerland — 1.8%
Cie Financiere Richemont SA Registered		39,999		3,614,402
Taiwan — 8.6%
MediaTek, Inc.		21,000		560,822
Taiwan Semiconductor Manufacturing Co. Ltd.		882,000		16,565,267
				17,126,089
Turkey — 0.5%
Akbank T.A.S. (a)		1,071,086		1,002,157
United States — 3.6%
Yum China Holdings, Inc.		126,599		7,227,537
TOTAL COMMON STOCK (Cost $143,940,781)				189,862,180
Preferred Stock — 2.8%
Brazil — 1.5%
Lojas Americanas SA 0.640%
		583,772		2,968,389
India — 0.0%
Zee Entertainment Enterprises Ltd. 6.000%		742,906		40,466
Singapore — 1.3%
Grab Holdings, Inc., (Acquired 6/18/19, Cost $2,438,401) (a) (d) (e) (f)		395,658		2,438,401
TOTAL PREFERRED STOCK (Cost $5,805,316)				5,447,256
TOTAL EQUITIES (Cost $149,746,097)				195,309,436

MassMutual Premier Strategic Emerging Markets Fund — Portfolio of Investments (Continued)

	Number of Shares		Value
Mutual Funds — 0.4%
United States — 0.4%
State Street Navigator Securities Lending Prime Portfolio (g)		841,993	$	841,993
TOTAL MUTUAL FUNDS (Cost $841,993)				841,993
Warrants — 0.0%
Switzerland — 0.0%
Cie Financiere Richemont SA, Expires 11/22/23, Strike 67.00 (a)		68,286		17,741
TOTAL WARRANTS (Cost $0)				17,741
TOTAL LONG-TERM INVESTMENTS (Cost $150,588,090)				196,169,170

	Principal Amount
Short-Term Investments — 3.4%
Repurchase Agreement — 3.4%
Fixed Income Clearing Corp., Repurchase Agreement, dated 12/31/20, 0.000%, due 1/04/21 (h)	$	6,810,668		6,810,668
TOTAL SHORT-TERM INVESTMENTS (Cost $6,810,668)				6,810,668
TOTAL INVESTMENTS — 101.6% (Cost $157,398,758) (i)				202,979,838
Other Assets/(Liabilities) — (1.6)%				(3,137,249	)
NET ASSETS — 100.0%			$	199,842,589

Abbreviation Legend

ADR	American Depositary Receipt
GDR	Global  Depositary Receipt

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a)	Non-income producing security.
(b)	Security is exempt from registration under Regulation S or Rule 144A of the Securities Act of 1933. These securities are considered restricted and may be resold in transactions exempt from registration. At December 31, 2020, the aggregate market value of these securities amounted to $15,496,765 or 7.75% of net assets.
(c)	Denotes all or a portion of security on loan. The total value of securities on loan as of December 31, 2020, was $799,023 or 0.40% of net assets. Total securities on loan may be less than the amounts identified in the Portfolio of Investments. (Note 2).
(d)	This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At December 31, 2020, these securities amounted to a value of $2,996,027 or 1.50% of net assets.
(e)	Investment was valued using significant unobservable inputs.
(f)	Restricted security. Certain securities are restricted as to resale. At December 31, 2020, these securities amounted to a value of $2,438,401 or 1.22% of net assets. The Fund generally bears the costs, if any, associated with the disposition of restricted securities.
(g)	Represents investment of security lending cash collateral. (Note 2).
(h)	Maturity value of $6,810,668. Collateralized by U.S. Government Agency obligations with a rate of 0.000%, maturity date of 12/30/21, and an aggregate market value, including accrued interest, of $6,946,911.
(i)	See Note 3 for aggregate cost for federal tax purposes.

Notes to Portfolio of Investments (Unaudited)

1. The Funds

MassMutual Premier Funds (the “Trust”) is registered under the Investment Company Act of 1940, as amended (the “1940 Act”), as an open-end management investment company. The Trust is organized under the laws of the Commonwealth of Massachusetts as a Massachusetts business trust pursuant to an Agreement and Declaration of Trust dated August 1, 1994, as amended and restated as of November 21, 2011, as it may be further amended from time to time. The Trust consists of the following series (each individually referred to as a “Fund” or collectively as the “Funds”):

MassMutual Premier Short-Duration Bond Fund (“Short-Duration Bond Fund”)

MassMutual Premier Inflation-Protected and Income Fund (“Inflation-Protected and Income Fund”)

MassMutual Premier Core Bond Fund (“Core Bond Fund”)

MassMutual Premier Diversified Bond Fund (“Diversified Bond Fund”)

MassMutual Premier High Yield Fund (“High Yield Fund”)

MassMutual Premier Balanced Fund (“Balanced Fund”)

MassMutual Premier Disciplined Value Fund (“Disciplined Value Fund”)

MassMutual Premier Main Street Fund (“Main Street Fund”)

MassMutual Premier Disciplined Growth Fund (“Disciplined Growth Fund”)

MassMutual Premier Small Cap Opportunities Fund (“Small Cap Opportunities Fund”)

MassMutual Premier Global Fund (“Global Fund”)

MassMutual Premier International Equity Fund (“International Equity Fund”)

MassMutual Premier Strategic Emerging Markets Fund (“Strategic Emerging Markets Fund”)

Notes to Portfolio of Investments (Unaudited) (Continued)

2. Significant Accounting Policies

Each Fund is an investment company and accordingly follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic 946, Financial Services – Investment Companies.

Investment Valuation

The net asset value of each Fund’s shares is determined once daily as of the close of regular trading on the New York Stock Exchange (“NYSE”), on each day the NYSE is open for trading (a “business day”). The NYSE normally closes at 4:00 p.m. Eastern Time, but may close earlier on some days. If the NYSE is scheduled to close early, the business day will be considered to end as of the time of the NYSE’s scheduled close. A Fund will not treat an intraday disruption in NYSE trading or other event that causes an unscheduled closing of the NYSE as a close of business of the NYSE for these purposes and will instead fair value securities in accordance with procedures approved annually by the Board of Trustees (“Trustees”), and under the general oversight of the Trustees. On holidays and other days when the NYSE is closed, each Fund’s net asset value generally is not calculated and the Funds do not anticipate accepting buy or sell orders. However, the value of each Fund’s assets may still be affected on such days to the extent that a Fund holds foreign securities that trade on days that foreign securities markets are open.

Equity securities and derivative contracts that are actively traded on a national securities exchange or contract market are valued on the basis of information furnished by a pricing service, which provides the last reported sale price, or, in the case of futures contracts, the settlement price, for securities or derivatives listed on the exchange or contract market or the official closing price on the NASDAQ National Market System (“NASDAQ System”), or in the case of over-the-counter (“OTC”) securities for which an official closing price is unavailable or not reported on the NASDAQ System, the last reported bid price. Portfolio securities traded on more than one national securities exchange are valued at the last price at the close of the exchange representing the principal market for such securities. Debt securities are valued on the basis of valuations furnished by a pricing service, which generally determines valuations taking into account factors such as institutional-size trading in similar securities, yield, quality, coupon rate, maturity, type of issue, trading characteristics, and other market data. Shares of other open-end mutual funds are valued at their closing net asset values as reported on each business day.

Investments for which market quotations are readily available are marked to market daily based on those quotations. Market quotations may be provided by third-party vendors or market makers, and may be determined on the basis of a variety of factors, such as broker quotations, financial modeling, and other market data, such as market indexes and yield curves, counterparty information, and foreign exchange rates. U.S. Government and agency securities may be valued on the basis of market quotations or using a model that may incorporate market observable data such as reported sales of similar securities, broker quotes, yields, bids, offers, quoted market prices, and reference data. The fair values of OTC derivative contracts, including forward, swap, and option contracts related to interest rates, foreign currencies, credit standing of reference entities, equity prices, or commodity prices, may be based on market quotations or may be modeled using a series of techniques, including simulation models, depending on the contract and the terms of the transaction. The fair values of asset-backed securities and mortgage-backed securities are estimated based on models that consider the estimated cash flows of each debt tranche of the issuer, established benchmark yield, and estimated tranche-specific spread to the benchmark yield based on the unique attributes of the tranche, including, but not limited to, prepayment speed assumptions and attributes of the collateral. Restricted securities are generally valued at a discount to similar publicly traded securities.

Notes to Portfolio of Investments (Unaudited) (Continued)

Investments for which market quotations are not available or for which a pricing service or vendor does not provide a value, or for which such market quotations or values are considered by the investment adviser or subadviser to be unreliable (including, for example, certain foreign securities, thinly-traded securities, certain restricted securities, certain initial public offerings, or securities whose values may have been affected by a significant event) are stated at fair valuations determined in good faith by the Funds’ Valuation Committee¹ in accordance with procedures approved annually by the Trustees, and under the general oversight of the Trustees. The Funds’ Valuation Committee employs various methods to determine fair valuations including a regular review of significant inputs and assumptions and review of any related market activity. The Funds’ Valuation Committee reports to the Trustees at its regularly scheduled meetings. It is possible that fair value prices will be used by the Funds to a significant extent. The value determined for an investment using the Funds’ fair value procedures may differ from recent market prices for the investment and may be significantly different from the value realized upon the sale of such investment.

The Funds may invest in securities that are traded principally in foreign markets and that trade on weekends and other days when the Funds do not price their shares. As a result, the values of the Funds’ portfolio securities may change on days when the prices of the Funds’ shares are not calculated. The prices of the Funds’ shares will reflect any such changes when the prices of the Funds’ shares are next calculated, which is the next business day.  The Funds may use fair value pricing more frequently for securities primarily traded in foreign markets because, among other things, most foreign markets close well before the Funds value their securities. The earlier close of these foreign markets gives rise to the possibility that significant events, including broad market moves, may have occurred in the interim. The Funds’ investments may be priced based on fair values provided by a third-party vendor, based on certain factors and methodologies applied by such vendor, in the event that there is movement in the U.S. market, between the close of the foreign market and the time the Funds calculate their net asset values. All assets and liabilities expressed in foreign currencies are converted into U.S. dollars at the mean between the buying and selling rates of such currencies against the U.S. dollar at the end of each business day.

For investments in equity or debt issued by privately held companies or funds (“Private Company” or collectively, the “Private Companies”) and any other investments fair valued using significant unobservable inputs, as described below, the fair valuation approaches used by third party service providers and/or the Funds’ subadvisers utilize one or a combination of, but not limited to, the following inputs:

¹ The voting members of the Valuation Committee consist of the President, Treasurer, Assistant Treasurers, Vice Presidents (except for the CCO, Secretary, and Assistant Secretaries) of the Trust, as well as such other members as the Trustees may from time to time designate. The non-voting members of the Valuation Committee consist of the CCO, Secretary, and Assistant Secretaries. The Valuation Committee reviews and determines the fair valuation of portfolio securities and the Funds’ pricing procedures in general.

Notes to Portfolio of Investments (Unaudited) (Continued)

Market approach: (i) recent market transactions, including subsequent rounds of financing, in the underlying investment or comparable issuers; (ii) recapitalizations and other transactions across the capital structure; and (iii) market multiples of comparable issuers.

Income approach: (i) future cash flows discounted to present value and adjusted as appropriate for liquidity, credit, and/or market risks; (ii) quoted prices for similar investments or assets in active markets; and (iii) other risk factors, such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks, recovery rates, liquidation amounts, and/or default rates.

Cost approach: (i) audited or unaudited financial statements, investor communications, and financial or operational metrics issued by the Private Company; (ii) changes in the valuation of relevant indices or publicly traded companies comparable to the Private Company; (iii) relevant news and other public sources; and (iv) known secondary market transactions in the Private Company’s interests and merger or acquisition activity in companies comparable to the Private Company.

Investments in series of preferred stock issued by Private Companies are typically valued utilizing Market approach in determining the enterprise value of the company. Such investments often contain rights and preferences that differ from other series of preferred and common stock of the same issuer. Valuation techniques such as the current value method (“CVM”), an option pricing model (“OPM”), a probability weighted expected return model (“PWERM”), or a hybrid of those techniques are used in allocating enterprise value of the company, as deemed appropriate under the circumstances. The CVM allocates value among the various parts of a company’s capital structure assuming that the value of convertible preferred stock is represented by the most favorable claim the preferred stockholders have on the enterprise value as of the valuation date. The use of OPM and PWERM techniques involve a determination of the exit scenarios of the investment in order to appropriately allocate the enterprise value of the company among the various parts of its capital structure.

The Private Companies are not subject to the public company disclosure, timing, and reporting standards as other investments held by a Fund. Typically, the most recently available information for a Private Company is as of a date that is earlier than the date a Fund is calculating its net asset value. This factor may result in a difference between the value of the investment and the price a Fund could receive upon the sale of the investment.

Notes to Portfolio of Investments (Unaudited) (Continued)

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-tier hierarchy is utilized to maximize the use of observable market data inputs and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Inputs refer broadly to the assumptions that market participants would use in pricing the asset or liability, including assumptions about risk, for example, the risk inherent in a particular valuation technique used to measure fair value (such as a pricing model) and/or the risk inherent in the inputs to the valuation technique. Inputs may be observable or unobservable. Observable inputs are inputs that reflect the assumptions market participants would use in pricing the asset or liability and are developed based on market data obtained from sources independent of the reporting entity. Unobservable inputs are inputs that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. The three-tier hierarchy of inputs is summarized in the three broad Levels listed below. The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those investments and the determination of the significance of a particular input to the fair value measurement in its entirety requires judgment and consideration of factors specific to each security.

Level 1 – quoted prices (unadjusted) in active markets for identical investments that the Funds can access at the measurement date

Level 2 – other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc.)

Level 3 – significant unobservable inputs, to the extent observable inputs are not available (including the Funds’ own assumptions in determining the fair value of investments)

The availability of observable inputs can vary from security to security and is affected by a wide variety of factors, including, for example, the type of security, whether the security is new and not yet established in the marketplace, the liquidity of markets, and other characteristics particular to the security. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3.

Changes in valuation techniques may result in transfers in or out of an investment’s assigned Level within the hierarchy. In addition, in periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This condition, as well as changes related to liquidity of investments, could cause a security to be reclassified between Levels.

In certain cases, the inputs used to measure fair value may fall into different Levels of the fair value hierarchy. In such cases, for disclosure purposes, the Level in the fair value hierarchy within which the fair value measurement falls is determined based on the lowest Level input that is significant to the overall fair value measurement.

Notes to Portfolio of Investments (Unaudited) (Continued)

The Disciplined Value Fund, Disciplined Growth Fund, and Small Cap Opportunities Fund characterized all long-term investments at Level 1, and all short-term investments at Level 2, as of December 31, 2020. For each Fund noted in the preceding sentence, the level classification by major category of investments is the same as the category presentation in the Portfolio of Investments.

The following is the aggregate value by input level, as of December 31, 2020, for the remaining Funds’ investments:

Short-Duration Bond Fund
Asset Investments	Level 1			Level 2		Level 3		Total
Corporate Debt	$	—		$	180,985,516	$	—	$	180,985,516
Municipal Obligations		—			616,492		—		616,492
Non-U.S. Government Agency Obligations		—			200,381,900		—		200,381,900
U.S. Government Agency Obligations and Instrumentalities		—			5,271,099		—		5,271,099
U.S. Treasury Obligations		—			1,836,604		—		1,836,604
Purchased Options		—			391,060		—		391,060
Short-Term Investments		—			38,924,708		—		38,924,708
Total Investments	$	—		$	428,407,379	$	—	$	428,407,379
Asset Derivatives
Futures Contracts	$	110,189		$	—	$	—	$	110,189
Liability Derivatives
Futures Contracts	$	(729,671	)	$	—	$	—	$	(729,671	)

Notes to Portfolio of Investments (Unaudited) (Continued)

Inflation-Protected and Income Fund
Asset Investments	Level 1			Level 2		Level 3		Total
Non-U.S. Government Agency Obligations	$	—		$	205,731,428	$	—	$	205,731,428
U.S. Government Agency Obligations and Instrumentalities		—			15,149,064		—		15,149,064
U.S. Treasury Obligations		—			90,138,898		—		90,138,898
Purchased Options		—			740,413		—		740,413
Short-Term Investments		—			81,084,180		—		81,084,180
Total Investments	$	—		$	392,843,983	$	—	$	392,843,983
Asset Derivatives
Futures Contracts	$	85,539		$	—	$	—	$	85,539
Swap Agreements		—			4,758,879		—		4,758,879
Total	$	85,539		$	4,758,879	$	—	$	4,844,418
Liability Derivatives
Futures Contracts	$	(25,360	)	$	—	$	—	$	(25,360	)

Notes to Portfolio of Investments (Unaudited) (Continued)

Core Bond Fund
Asset Investments	Level 1			Level 2		Level 3		Total
Corporate Debt	$	—		$	516,275,578	$	—	$	516,275,578
Municipal Obligations		—			3,909,155		—		3,909,155
Non-U.S. Government Agency Obligations		—			441,308,081		—		441,308,081
Sovereign Debt Obligations		—			10,471,065		—		10,471,065
U.S. Government Agency Obligations and Instrumentalities		—			291,051,242		—		291,051,242
U.S. Treasury Obligations		—			110,829,764		—		110,829,764
Purchased Options		—			2,456,154		—		2,456,154
Short-Term Investments		—			189,995,532		—		189,995,532
Total Investments	$	—		$	1,566,296,571	$	—	$	1,566,296,571
Asset Derivatives
Futures Contracts	$	210,132		$	—	$	—	$	210,132
Liability Derivatives
Futures Contracts	$	(2,304,792	)	$	—	$	—	$	(2,304,792	)

Notes to Portfolio of Investments (Unaudited) (Continued)

Diversified Bond Fund
Asset Investments	Level 1			Level 2			Level 3		Total
Common Stock	$	—		$	807		$	59,715	$	60,522
Preferred Stock		486,438			—			—		486,438
Corporate Debt		—			103,744,810			—		103,744,810
Non-U.S. Government Agency Obligations		—			70,370,240			—		70,370,240
Sovereign Debt Obligations		—			1,609,514			—		1,609,514
U.S. Government Agency Obligations and Instrumentalities		—			34,845,019			—		34,845,019
U.S. Treasury Obligations		—			4,974,698			—		4,974,698
Purchased Options		—			474,682			—		474,682
Warrants		—			—			3,896		3,896
Short-Term Investments		—			26,347,189			—		26,347,189
Total Investments	$	486,438		$	242,366,959		$	63,611	$	242,917,008
Asset Derivatives
Forward Contracts	$	—		$	198,860		$	—	$	198,860
Futures Contracts		58,318			—			—		58,318
Total	$	58,318		$	198,860		$	—	$	257,178
Liability Derivatives
Forward Contracts	$	—		$	(82,315	)	$	—	$	(82,315	)
Futures Contracts		(400,539	)		—			—		(400,539	)
Total	$	(400,539	)	$	(82,315	)	$	—	$	(482,854	)

Notes to Portfolio of Investments (Unaudited) (Continued)

High Yield Fund
Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock	$	—	$	9,899	$	1,952,765	$	1,962,664
Bank Loans		—		35,179,145		—		35,179,145
Corporate Debt		—		560,640,203		—		560,640,203
Short-Term Investments		—		18,213,379		—		18,213,379
Total Investments	$	—	$	614,042,626	$	1,952,765	$	615,995,391

Notes to Portfolio of Investments (Unaudited) (Continued)

Balanced Fund
Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock	$	99,097,280	$	—	$	—	$	99,097,280
Corporate Debt		—		20,098,534		—		20,098,534
Non-U.S. Government Agency Obligations		—		651,050		—		651,050
U.S. Government Agency Obligations and Instrumentalities		—		10,644,050		—		10,644,050
U.S. Treasury Obligations		—		20,090,752		—		20,090,752
Mutual Funds		455,145		—		—		455,145
Short-Term Investments		—		8,210,720		—		8,210,720
Total Investments	$	99,552,425	$	59,695,106	$	—	$	159,247,531

Notes to Portfolio of Investments (Unaudited) (Continued)

Main Street Fund
Asset Investments	Level 1		Level 2			Level 3		Total
Common Stock	$	118,858,629	$	684,878	*	$	—	$	119,543,507
Short-Term Investments		—		1,014,861			—		1,014,861
Total Investments	$	118,858,629	$	1,699,739		$	—	$	120,558,368

Notes to Portfolio of Investments (Unaudited) (Continued)

Global Fund
Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock*
Cayman Islands	$	24,881,232	$	—	$	—	$	24,881,232
Denmark		245,834		—		—		245,834
France		—		28,667,619		—		28,667,619
Germany		—		8,885,845		—		8,885,845
India		4,974,132		6,304,688		—		11,278,820
Italy		—		943,808		—		943,808
Japan		—		59,297,603		—		59,297,603
Netherlands		1,048,276		11,392,169		—		12,440,445
Spain		—		4,317,956		—		4,317,956
Sweden		—		10,177,726		—		10,177,726
Switzerland		—		1,552,216		—		1,552,216
United Kingdom		—		4,010,089		—		4,010,089
United States		189,248,765		—		—		189,248,765
Preferred Stock
India		31,214		—		—		31,214
Short-Term Investments		—		4,515,473		—		4,515,473
Total Investments	$	220,429,453	$	140,065,192	$	—	$	360,494,645

Notes to Portfolio of Investments (Unaudited) (Continued)

International Equity Fund

Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock*
Australia	$	—	$	1,578,929	$	—	$	1,578,929
Belgium		—		956,474		—		956,474
Canada		9,343,973		—		—		9,343,973
Cayman Islands		—		942,538		—		942,538
Denmark		—		423,687		—		423,687
France		—		19,361,688		—		19,361,688
Germany		—		7,816,373		—		7,816,373
Hong Kong		—		5,623,360		—		5,623,360
Ireland		532,622		5,961,900		—		6,494,522
Israel		330,946		—		—		330,946
Italy		—		757,356		—		757,356
Japan		—		35,612,597		—		35,612,597
Luxembourg		—		605,842		—		605,842
Netherlands		413,426		11,139,328		—		11,552,754
Norway		—		485,539		—		485,539
Singapore		—		607,168		—		607,168
Spain		—		7,086,200		—		7,086,200
Sweden		—		4,058,307		—		4,058,307
Switzerland		—		20,141,338		—		20,141,338
United Kingdom		4,580,929		36,263,562		—		40,844,491
Mutual Funds		10,872,481		—		—		10,872,481
Short-Term Investments		—		3,554,193		—		3,554,193
Total Investments	$	26,074,377	$	162,976,379	$	—	$	189,050,756

Notes to Portfolio of Investments (Unaudited) (Continued)

Strategic Emerging Markets Fund
Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock*
Belgium	$	—	$	2,093,051	$	—	$	2,093,051
Bermuda		1,833,416		1,452,533		—		3,285,949
Brazil		3,854,565		2,826,594		—		6,681,159
Cayman Islands		25,879,116		20,742,755		—		46,621,871
Chile		—		1,499,806		—		1,499,806
China		260,169		8,913,207		—		9,173,376
Colombia		807,100		—		—		807,100
Egypt		—		1,295,734		—		1,295,734
France		—		10,503,334		—		10,503,334
Hong Kong		—		7,870,989		—		7,870,989
India		—		28,563,982		—		28,563,982
Indonesia		—		2,456,685		—		2,456,685
Italy		—		4,046,511		—		4,046,511
Luxembourg		—		231,027		—		231,027
Mexico		11,109,094		—		—		11,109,094
Netherlands		6,360,656		—		—		6,360,656
Philippines		—		5,150,138		—		5,150,138
Republic of Korea		—		3,297,521		—		3,297,521
Russia		966,184		7,643,636		—		8,609,820
South Africa		—		1,234,192		—		1,234,192
Switzerland		—		3,614,402		—		3,614,402
Taiwan		—		17,126,089		—		17,126,089
Turkey		—		1,002,157		—		1,002,157
United States		7,227,537		—		—		7,227,537
Preferred Stock*
Brazil		—		2,968,389		—		2,968,389
India		40,466		—		—		40,466
Singapore		—		—		2,438,401		2,438,401
Mutual Funds		841,993		—		—		841,993
Warrants		17,741		—		—		17,741
Short-Term Investments		—		6,810,668		—		6,810,668
Total Investments	$	59,198,037	$	141,343,400	$	2,438,401	$	202,979,838

^* Includes foreign equity securities whose values were adjusted to reflect market trading of comparable securities or other correlated instruments after the close of trading in their respective foreign markets, as applicable.

Notes to Portfolio of Investments (Unaudited) (Continued)

Derivative Instruments

Derivatives are financial instruments whose values are based on the values of one or more indicators, such as a security, asset, currency, interest rate, or index. Derivative transactions can create investment leverage and may be highly volatile. Losses from derivatives can be substantially greater than the derivatives’ original cost and can sometimes be unlimited. A Fund may not be able to close out a derivative transaction at a favorable time or price.

Please refer to the Funds’ most recent Annual/Semiannual reports and prospectus(es) and Statement(s) of Additional Information which can be found on the Securities and Exchange Commission’s (“SEC”) EDGAR database on its website at http://www.sec.gov for more information regarding the derivatives and other investments held by the Fund(s).

Securities Lending

Each Fund may lend its securities; however, lending cannot exceed 33% of the total assets of the Fund taken at current value. The Funds’ securities lending activities are governed by a Securities Lending Agency Agreement (“Lending Agreement”) between each Fund and the lending agent (“Agent”). The Lending Agreement authorizes the Agent to lend portfolio securities held by a Fund to approved borrowers (each, a “Borrower”).

Notes to Portfolio of Investments (Unaudited) (Continued)

Each Fund expects that in connection with any securities on loan, the loan will be secured continuously by collateral consisting of cash (U.S. currency) and/or securities (U.S. Treasury and Agency obligations) adjusted daily to have value at least equal to the current market value of the securities loaned. The market value of the loaned securities is determined at the close of business of a Fund and any additional collateral is delivered to the Fund the next business day. The Funds bear the risk of loss with respect to the investment of cash collateral. As with other extensions of credit, the Funds may bear the risk of delay in recovery of the loaned securities or even loss of rights in the collateral should the Borrower of the securities fail financially. Pursuant to the Lending Agreement, the Agent has provided indemnification to the Funds in the event of default by a Borrower with respect to a loan. The Funds receive compensation for lending their securities in the form of a securities loan fee paid by the Borrower, as well as a share of the income earned on investment of the cash collateral received for the loaned securities. At December 31, 2020, the Funds’ collateral was equal to or greater than 100% of the market value of securities on loan.

Subject to the terms of the Lending Agreement and the agreement between the Agent and the applicable Borrower (“Borrowing Agreement”), security loans can be terminated by the Agent, the Fund, or the Borrower and the related securities must be returned within the earlier of the customary settlement period for such securities or the period of time specified in the Borrowing Agreement.

Accounting for Investment Transactions

Investment transactions are accounted for on the trade date. Realized gains and losses on sales of investments and unrealized appreciation and depreciation of investments are computed by the specific identification cost method. Proceeds received from litigation, if any, are included in realized gains on investment transactions for any investments that are no longer held in the portfolio and as a reduction in cost for investments that continue to be held in the portfolio. Interest income, adjusted for amortization of discounts and premiums on debt securities, is earned from the settlement date and is recorded on the accrual basis. Dividend income is recorded on the ex-dividend date. Withholding taxes on foreign interest, dividends, and capital gains have been provided for in accordance with the applicable country’s tax rules and rates. Foreign dividend income is recorded on the ex-dividend date or as soon as practicable after the Fund determines the existence of a dividend declaration after exercising reasonable due diligence. Distributions received on securities that represent a return of capital or capital gains are recorded as a reduction of cost of investments and/or as a realized gain. The Funds determine the classification of distributions received as return of capital distributions or capital gain distributions.

Foreign Currency Translation

The books and records of the Funds are maintained in U.S. dollars. The market values of foreign currencies, foreign securities, and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars at the mean of the buying and selling rates of such currencies against the U.S. dollar at the end of each business day. Purchases and sales of foreign securities and income and expense items are translated at the rates of exchange prevailing on the respective dates of such transactions. The Funds do not isolate that portion of the results of operations arising from changes in the exchange rates from that portion arising from changes in the market prices of securities. Net realized foreign currency gains and losses resulting from changes in exchange rates include foreign currency gains and losses between trade date and settlement date on investment securities transactions, foreign currency transactions, and the difference between the amounts of dividends or interest recorded on the books of the Funds and the amount actually received.

Notes to Portfolio of Investments (Unaudited) (Continued)

Foreign Securities

The Global Fund invests a significant amount of its assets in foreign securities and each of the International Equity Fund and Strategic Emerging Markets Fund invests substantially all of its assets in foreign securities. The other Funds may also invest in foreign securities. Foreign securities, including American Depositary Receipts, are subject to additional risks compared to securities of U.S. issuers, including international trade, currency, political, regulatory, and diplomatic risks. In addition, fluctuations in currency exchange rates may adversely affect the values of foreign securities and the price of a Fund’s shares. Emerging markets securities are subject to greater risks than securities issued in developed foreign markets, including less liquidity, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, and greater volatility in currency exchange rates.

Federal Income Tax

It is each Fund’s intent to continue to comply with the provisions of Subchapter M of the Internal Revenue Code of 1986, as amended, applicable to a regulated investment company. Under such provisions, the Funds would not be subject to federal income taxes on their ordinary income and net realized capital gains to the extent they are distributed or deemed to have been distributed to their shareholders. Therefore, the Funds have not made any provision for federal income tax.

Dividends and Distributions to Shareholders

Dividends from net investment income of each Fund are declared and paid annually and at other times as may be required to satisfy tax or regulatory requirements. Distributions of any net realized capital gains of each Fund are declared and paid annually and at other times as may be required to satisfy tax or regulatory requirements.

Distributions to shareholders are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from generally accepted accounting principles. As a result, net investment income and net realized capital gains on investment transactions for a reporting period may differ significantly from distributions during such period.

3. Federal Income Tax Information

At December 31, 2020, the aggregate cost of investments and the unrealized appreciation (depreciation) in the value of all investments owned by the Fund(s), as computed on a federal income tax basis, were as follows:

	Federal Income Tax Cost		Tax Basis Unrealized Appreciation		Tax Basis Unrealized (Depreciation)		Net Unrealized Appreciation (Depreciation)
Short-Duration Bond Fund	$	424,905,465	$	9,162,073	$	(5,660,159)	$	3,501,914
Inflation-Protected and Income Fund		386,691,434		7,503,552		(1,351,003)		6,152,549
Core Bond Fund		1,516,973,666		64,087,318		(14,764,413)		49,322,905
Diversified Bond Fund		235,765,626		11,418,546		(4,267,164)		7,151,382
High Yield Fund		597,235,850		35,861,774		(17,102,233)		18,759,541
Balanced Fund		155,644,269		4,423,531		(820,269)		3,603,262
Disciplined Value Fund		89,590,076		5,014,085		(1,158,357)		3,855,728
Main Street Fund		90,641,932		30,930,275		(1,013,839)		29,916,436
Disciplined Growth Fund		213,452,418		66,162,199		(1,877,680)		64,284,519
Small Cap Opportunities Fund		226,895,483		68,082,751		(13,553,650)		54,529,101
Global Fund		159,713,728		200,981,805		(200,888)		200,780,917
International Equity Fund		171,418,142		19,657,784		(2,025,170)		17,632,614
Strategic Emerging Markets Fund		157,398,758		48,962,000		(3,380,920)		45,581,080

Notes to Portfolio of Investments (Unaudited) (Continued)

4. New Accounting Pronouncements

In October 2020, Accounting Standards Update 2017-08, Receivables — Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities ("ASU 2017-08") was amended by Accounting Standards Update 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs (“ASU 2020-08”). ASU 2020-08 requires entities to reevaluate whether callable debt securities fall within the scope of ASU 2017-08 at each reporting period. ASU 2020-08 also amends the relevant guidance to require premiums to be amortized to the “next call date” rather than the “earliest call date,” and further clarifies the definition of “next call date.” ASU 2020-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption of ASU 2020-08 is not permitted. Management is currently evaluating the impact, if any, of applying ASU 2020-08.

In March 2020, FASB issued Accounting Standards Update 2020-04 — Reference Rate Reform (Topic 848) — Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). ASU 2020-04 provides optional temporary financial reporting relief from the effect of certain types of contract modifications due to the planned discontinuation of the London Interbank Offered Rate (“LIBOR”) and other interbank-offered based reference rates as of the end of 2021. ASU 2020-04 is effective for certain reference rate-related contract modifications that occur during the period March 12, 2020 through December 31, 2022. Management is currently evaluating the impact, if any, of applying ASU 2020-04.

5. Legal Proceedings

On December 7, 2010, the Trust was named as a defendant and putative member of the proposed defendant class of shareholders named in an adversary proceeding brought by The Official Committee of Unsecured Creditors of Tribune Company (the “Official Committee”) in the U.S. Bankruptcy Court for the District of Delaware, in connection with Tribune Company’s Chapter 11 bankruptcy proceeding (In re Tribune Company). The proceeding relates to a leveraged buyout (“LBO”) transaction by which Tribune Company converted to a privately-held company in 2007, and the putative defendant class is comprised of beneficial owners of shares of Tribune Company who received proceeds (the “Proceeds”) of the LBO. The Official Committee seeks to recover payments of those Proceeds. On April 5, 2012, the adversary proceeding was transferred to the Southern District of New York for consolidated pretrial proceedings. The action is now being prosecuted by the litigation trustee (“Trustee”) for the Tribune Litigation Trust.

Notes to Portfolio of Investments (Unaudited) (Continued)

The potential amounts sought to be recovered from the Balanced Fund, Disciplined Value Fund, and Small Cap Opportunities Fund, are approximately $44,200, $299,880, and $414,800, respectively, plus interest and the Official Committee’s court costs.

In addition, on June 2, 2011, the Disciplined Value Fund and Small Cap Opportunities Fund were named as defendants in a closely related, parallel adversary proceeding brought in connection with the Tribune Company’s LBO by Deutsche Bank Trust Company Americas, in its capacity as successor indenture trustee for a certain series of Senior Notes, Law Debenture Trust Company of New York, in its capacity as successor indenture trustee for a certain series of Senior Notes, and Wilmington Trust Company, in its capacity as successor indenture trustee for the PHONES Notes (together, the “Plaintiffs”), in the United States District Court for the District of Massachusetts. The Plaintiffs also seek to recover payments of the Proceeds. On December 20, 2011, this action was transferred to the Southern District of New York for consolidated pretrial proceedings.

The Funds cannot predict the outcome of these proceedings. Accordingly, the Funds have not accrued any amounts related to these proceedings. If the proceedings were to be decided in a manner adverse to the Funds, or if the Funds were to enter into a settlement agreement with the Trustee or the Plaintiffs, as applicable, the payment of such judgment or settlement could potentially have a material adverse effect on the Funds’ net asset values depending on the net assets of each applicable Fund at the time of such judgment or settlement.

6. Coronavirus (COVID-19) Pandemic

The global pandemic outbreak of the novel coronavirus known as COVID-19 has produced, and will likely continue to produce, substantial market volatility, severe market dislocations and liquidity constraints in many markets, and global business disruption, and it may result in future significant adverse effects, such as exchange trading suspensions and closures, declines in global financial markets, higher default rates, and a substantial economic downturn or recession throughout the world. Such factors may have a significant adverse effect on a Fund’s performance and have the potential to impair the ability of a Fund’s investment adviser, subadviser, or other service providers to serve the Fund and could lead to disruptions that negatively impact the Fund.