MML Series Investment Fund NPORT-P MML Small Company Value Fund (Mar 2024 report)

MML Conservative Allocation Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 40.6%
MML Blue Chip Growth Fund, Initial Class (a)		602,299	$	10,997,987
MML Equity Income Fund, Initial Class (a)		986,033		10,609,718
MML Focused Equity Fund, Class II (a)		1,769,311		13,305,221
MML Foreign Fund, Initial Class (a)		497,736		4,927,588
MML Fundamental Equity Fund, Class II (a)		640,602		7,334,896
MML Fundamental Value Fund, Class II (a)		743,048		10,031,144
MML Global Fund, Class I (a)		1,246,091		5,582,489
MML Income & Growth Fund, Initial Class (a)		425,006		4,628,317
MML International Equity Fund, Class II (a)		1,362,918		14,460,555
MML Large Cap Growth Fund, Initial Class (a)		497,681		7,773,779
MML Mid Cap Growth Fund, Initial Class (a)		613,037		7,197,054
MML Mid Cap Value Fund, Initial Class (a)		703,808		5,827,528
MML Small Cap Growth Equity Fund, Initial Class (a)		24,392		253,304
MML Small Company Value Fund, Class II (a)		346,238		3,095,370
MML Small/Mid Cap Value Fund, Initial Class (a)		164,683		1,582,607
MML Strategic Emerging Markets Fund, Class II (a)		425,393		2,314,137
				109,921,694
Fixed Income Funds — 59.5%
Invesco V.I. Global Strategic Income Fund, Series I (b)		1,256,185		5,376,471
MML Dynamic Bond Fund, Class II (a)		3,862,610		32,832,188
MML High Yield Fund, Class II (a)		86,047		754,633
MML Inflation-Protected and Income Fund, Initial Class (a)		717,861		6,266,930
MML Managed Bond Fund, Initial Class (a)		4,856,177		52,844,412
MML Short-Duration Bond Fund, Class II (a)		1,485,850		13,387,508
MML Total Return Bond Fund, Class II (a)		5,093,771		45,487,378
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		524,566		4,033,911
				160,983,431
TOTAL MUTUAL FUNDS (Cost $287,521,306)				270,905,125
TOTAL LONG-TERM INVESTMENTS (Cost $287,521,306)				270,905,125
TOTAL INVESTMENTS — 100.1% (Cost $287,521,306) (c)				270,905,125
Other Assets/(Liabilities) — (0.1)%				(210,298)
NET ASSETS — 100.0%			$	270,694,827

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Affiliated issuer.

(b) Non-income producing security.

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

MML Balanced Allocation Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 50.8%
MML Blue Chip Growth Fund, Initial Class (a)		892,290	$	16,293,222
MML Equity Income Fund, Initial Class (a)		1,280,037		13,773,200
MML Focused Equity Fund, Class II (a)		3,495,906		26,289,212
MML Foreign Fund, Initial Class (a)		736,937		7,295,678
MML Fundamental Equity Fund, Class II (a)		966,964		11,071,736
MML Fundamental Value Fund, Class II (a)		907,776		12,254,974
MML Global Fund, Class I (a)		1,919,917		8,601,227
MML Income & Growth Fund, Initial Class (a)		653,421		7,115,750
MML International Equity Fund, Class II (a)		1,998,554		21,204,661
MML Large Cap Growth Fund, Initial Class (a)		773,772		12,086,326
MML Mid Cap Growth Fund, Initial Class (a)		750,069		8,805,804
MML Mid Cap Value Fund, Initial Class (a)		1,051,055		8,702,737
MML Small Cap Growth Equity Fund, Initial Class (a)		147,527		1,532,049
MML Small Company Value Fund, Class II (a)		398,547		3,563,006
MML Small/Mid Cap Value Fund, Initial Class (a)		225,204		2,164,211
MML Strategic Emerging Markets Fund, Class II (a)		566,206		3,080,160
				163,833,953
Fixed Income Funds — 49.3%
Invesco V.I. Global Strategic Income Fund, Series I (b)		1,248,495		5,343,558
MML Dynamic Bond Fund, Class II (a)		3,738,606		31,778,154
MML High Yield Fund, Class II (a)		89,165		781,980
MML Inflation-Protected and Income Fund, Initial Class (a)		813,440		7,101,332
MML Managed Bond Fund, Initial Class (a)		4,736,399		51,540,996
MML Short-Duration Bond Fund, Class II (a)		1,496,246		13,481,178
MML Total Return Bond Fund, Class II (a)		5,023,125		44,856,507
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		539,295		4,147,182
				159,030,887
TOTAL MUTUAL FUNDS (Cost $334,804,576)				322,864,840
TOTAL LONG-TERM INVESTMENTS (Cost $334,804,576)				322,864,840
TOTAL INVESTMENTS — 100.1% (Cost $334,804,576) (c)				322,864,840
Other Assets/(Liabilities) — (0.1)%				(258,271)
NET ASSETS — 100.0%			$	322,606,569

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Affiliated issuer.

(b) Non-income producing security.

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

MML Moderate Allocation Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 60.6%
MML Blue Chip Growth Fund, Initial Class (a)		3,806,249	$	69,502,105
MML Equity Income Fund, Initial Class (a)		5,530,181		59,504,751
MML Focused Equity Fund, Class II (a)		13,671,349		102,808,543
MML Foreign Fund, Initial Class (a)		3,052,576		30,220,506
MML Fundamental Equity Fund, Class II (a)		4,015,830		45,981,248
MML Fundamental Value Fund, Class II (a)		4,670,216		63,047,919
MML Global Fund, Class I (a)		7,646,495		34,256,298
MML Income & Growth Fund, Initial Class (a)		2,537,628		27,634,769
MML International Equity Fund, Class II (a)		8,612,512		91,378,755
MML Large Cap Growth Fund, Initial Class (a)		3,061,069		47,813,891
MML Mid Cap Growth Fund, Initial Class (a)		3,667,939		43,061,608
MML Mid Cap Value Fund, Initial Class (a)		3,751,696		31,064,042
MML Small Cap Growth Equity Fund, Initial Class (a)		936,849		9,729,081
MML Small Company Value Fund, Class II (a)		2,020,858		18,066,470
MML Small/Mid Cap Value Fund, Initial Class (a)		1,117,592		10,740,060
MML Strategic Emerging Markets Fund, Class II (a)		2,430,362		13,221,167
				698,031,213
Fixed Income Funds — 39.5%
Invesco V.I. Global Strategic Income Fund, Series I (b)		3,498,984		14,975,650
MML Dynamic Bond Fund, Class II (a)		10,879,286		92,473,928
MML High Yield Fund, Class II (a)		279,094		2,447,653
MML Inflation-Protected and Income Fund, Initial Class (a)		1,919,406		16,756,416
MML Managed Bond Fund, Initial Class (a)		13,551,350		147,464,366
MML Short-Duration Bond Fund, Class II (a)		4,217,468		37,999,388
MML Total Return Bond Fund, Class II (a)		14,476,690		129,276,845
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		1,731,620		13,316,155
				454,710,401
TOTAL MUTUAL FUNDS (Cost $1,179,116,060)				1,152,741,614
TOTAL LONG-TERM INVESTMENTS (Cost $1,179,116,060)				1,152,741,614
TOTAL INVESTMENTS — 100.1% (Cost $1,179,116,060) (c)				1,152,741,614
Other Assets/(Liabilities) — (0.1)%				(882,759)
NET ASSETS — 100.0%			$	1,151,858,855

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Affiliated issuer.

(b) Non-income producing security.

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

MML Growth Allocation Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 75.4%
MML Blue Chip Growth Fund, Initial Class (a)		4,078,141	$	74,466,855
MML Equity Income Fund, Initial Class (a)		5,552,464		59,744,517
MML Focused Equity Fund, Class II (a)		14,507,257		109,094,571
MML Foreign Fund, Initial Class (a)		3,184,088		31,522,469
MML Fundamental Equity Fund, Class II (a)		4,350,705		49,815,569
MML Fundamental Value Fund, Class II (a)		4,249,188		57,364,040
MML Global Fund, Class I (a)		8,186,302		36,674,634
MML Income & Growth Fund, Initial Class (a)		3,090,479		33,655,314
MML International Equity Fund, Class II (a)		8,836,385		93,754,042
MML Large Cap Growth Fund, Initial Class (a)		3,565,397		55,691,496
MML Mid Cap Growth Fund, Initial Class (a)		3,724,532		43,726,010
MML Mid Cap Value Fund, Initial Class (a)		3,938,286		32,609,009
MML Small Cap Growth Equity Fund, Initial Class (a)		993,483		10,317,220
MML Small Company Value Fund, Class II (a)		2,321,936		20,758,105
MML Small/Mid Cap Value Fund, Initial Class (a)		1,004,829		9,656,404
MML Strategic Emerging Markets Fund, Class II (a)		2,594,618		14,114,721
				732,964,976
Fixed Income Funds — 24.7%
Invesco V.I. Global Strategic Income Fund, Series I (b)		1,848,779		7,912,773
MML Dynamic Bond Fund, Class II (a)		5,342,568		45,411,832
MML High Yield Fund, Class II (a)		283,523		2,486,497
MML Inflation-Protected and Income Fund, Initial Class (a)		1,432,649		12,507,022
MML Managed Bond Fund, Initial Class (a)		6,826,774		74,288,233
MML Short-Duration Bond Fund, Class II (a)		2,327,673		20,972,330
MML Total Return Bond Fund, Class II (a)		7,659,668		68,400,831
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		1,074,886		8,265,872
				240,245,390
TOTAL MUTUAL FUNDS (Cost $973,866,461)				973,210,366
TOTAL LONG-TERM INVESTMENTS (Cost $973,866,461)				973,210,366
TOTAL INVESTMENTS — 100.1% (Cost $973,866,461) (c)				973,210,366
Other Assets/(Liabilities) — (0.1)%				(614,610)
NET ASSETS — 100.0%			$	972,595,756

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Affiliated issuer.

(b) Non-income producing security.

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

MML Aggressive Allocation Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 90.2%
MML Blue Chip Growth Fund, Initial Class (a)		715,781	$	13,070,170
MML Equity Income Fund, Initial Class (a)		869,539		9,356,235
MML Focused Equity Fund, Class II (a)		2,372,881		17,844,066
MML Foreign Fund, Initial Class (a)		507,228		5,021,552
MML Fundamental Equity Fund, Class II (a)		712,029		8,152,728
MML Fundamental Value Fund, Class II (a)		677,797		9,150,263
MML Global Fund, Class I (a)		1,203,587		5,392,070
MML Income & Growth Fund, Initial Class (a)		433,408		4,719,817
MML International Equity Fund, Class II (a)		1,410,192		14,962,138
MML Large Cap Growth Fund, Initial Class (a)		641,449		10,019,438
MML Mid Cap Growth Fund, Initial Class (a)		679,194		7,973,739
MML Mid Cap Value Fund, Initial Class (a)		630,180		5,217,888
MML Small Cap Growth Equity Fund, Initial Class (a)		155,743		1,617,372
MML Small Company Value Fund, Class II (a)		349,351		3,123,195
MML Small/Mid Cap Value Fund, Initial Class (a)		148,008		1,422,360
MML Strategic Emerging Markets Fund, Class II (a)		422,067		2,296,045
				119,339,076
Fixed Income Funds — 9.9%
Invesco V.I. Global Strategic Income Fund, Series I (b)		234,746		1,004,711
MML Dynamic Bond Fund, Class II (a)		241,821		2,055,475
MML High Yield Fund, Class II (a)		19,191		168,303
MML Inflation-Protected and Income Fund, Initial Class (a)		18,338		160,090
MML Managed Bond Fund, Initial Class (a)		323,296		3,518,069
MML Short-Duration Bond Fund, Class II (a)		231,582		2,086,550
MML Total Return Bond Fund, Class II (a)		365,980		3,268,200
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		108,205		832,096
				13,093,494
TOTAL MUTUAL FUNDS (Cost $131,684,618)				132,432,570
TOTAL LONG-TERM INVESTMENTS (Cost $131,684,618)				132,432,570
TOTAL INVESTMENTS — 100.1% (Cost $131,684,618) (c)				132,432,570
Other Assets/(Liabilities) — (0.1)%				(84,621)
NET ASSETS — 100.0%			$	132,347,949

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Affiliated issuer.

(b) Non-income producing security.

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

MML American Funds Growth Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 100.1%
American Funds Insurance Series Growth Fund, Class 1		2,371,950	$	265,587,261
TOTAL MUTUAL FUNDS (Cost $208,903,528)				265,587,261
TOTAL INVESTMENTS — 100.1% (Cost $208,903,528) (a)				265,587,261
Other Assets/(Liabilities) — (0.1)%				(264,713)
NET ASSETS — 100.0%			$	265,322,548

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

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

MML American Funds Core Allocation Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 65.8%
American Funds Insurance Series® Growth-Income Fund, Class 1		2,813,556	$	184,569,256
American Funds Insurance Series® International Fund, Class 1		3,595,505		67,056,177
American Funds Insurance Series® Washington Mutual Investors Fund, Class 1		11,658,469		184,553,559
				436,178,992
Fixed Income Funds — 34.3%
American Funds Insurance Series® The Bond Fund Of America, Class 1		24,046,102		227,716,585
TOTAL MUTUAL FUNDS (Cost $611,739,927)				663,895,577
TOTAL LONG-TERM INVESTMENTS (Cost $611,739,927)				663,895,577
TOTAL INVESTMENTS — 100.1% (Cost $611,739,927) (a)				663,895,577
Other Assets/(Liabilities) — (0.1)%				(732,923)
NET ASSETS — 100.0%			$	663,162,654

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

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

MML Blue Chip Growth Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.3%
COMMON STOCK — 98.1%
Communication Services — 15.2%
Alphabet, Inc. Class A (a)		44,664	$	6,741,137
Alphabet, Inc. Class C (a)		194,977		29,687,198
Meta Platforms, Inc. Class A		48,104		23,358,340
Netflix, Inc. (a)		12,869		7,815,730
Sea Ltd. ADR (a)		19,625		1,054,059
T-Mobile US, Inc.		26,523		4,329,084
				72,985,548
Consumer Discretionary — 14.2%
Amazon.com, Inc. (a)		224,912		40,569,627
Booking Holdings, Inc.		1,139		4,132,155
Carvana Co. (a)		26,449		2,325,132
Chipotle Mexican Grill, Inc. (a)		1,725		5,014,178
DoorDash, Inc., Class A (a)		11,612		1,599,205
Lululemon Athletica, Inc. (a)		3,828		1,495,408
NIKE, Inc. Class B		9,896		930,026
Ross Stores, Inc.		19,332		2,837,164
Tesla, Inc. (a)		40,778		7,168,365
TJX Cos., Inc.		20,296		2,058,420
				68,129,680
Consumer Staples — 1.4%
Colgate-Palmolive Co.		13,353		1,202,438
Dollar General Corp.		20,154		3,145,233
Mondelez International, Inc. Class A		16,739		1,171,730
Procter & Gamble Co.		6,866		1,114,008
				6,633,409
Energy — 0.3%
Schlumberger NV		30,763		1,686,120
Financials — 9.3%
Adyen NV ADR (a) (b)		77,473		1,310,068
Ant Group Balance Owed 2023 (Acquired 8/14/23, Cost $280,322) (a) (c) (d) (e)		280,322		282,733
Charles Schwab Corp.		23,328		1,687,548
Chubb Ltd.		18,825		4,878,122
Fiserv, Inc. (a)		7,212		1,152,622
Goldman Sachs Group, Inc.		2,955		1,234,274
Marsh & McLennan Cos., Inc.		13,540		2,788,969
Mastercard, Inc. Class A		25,631		12,343,121
Morgan Stanley		21,588		2,032,726
MSCI, Inc.		798		447,239
S&P Global, Inc.		5,096		2,168,093

MML Blue Chip Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Visa, Inc. Class A		52,157	$	14,555,976
				44,881,491
Health Care — 11.8%
Align Technology, Inc. (a)		1,074		352,186
AstraZeneca PLC Sponsored ADR		14,826		1,004,461
Danaher Corp.		11,438		2,856,297
Elevance Health, Inc.		3,770		1,954,896
Eli Lilly & Co.		21,283		16,557,323
Humana, Inc.		5,572		1,931,924
Intuitive Surgical, Inc. (a)		18,647		7,441,831
Stryker Corp.		7,910		2,830,752
Teleflex, Inc.		2,401		543,034
Thermo Fisher Scientific, Inc.		9,375		5,448,844
UnitedHealth Group, Inc.		25,726		12,726,652
Veeva Systems, Inc. Class A (a)		4,698		1,088,480
Zoetis, Inc.		12,141		2,054,379
				56,791,059
Industrials — 1.6%
Cintas Corp.		1,438		987,949
General Electric Co.		17,218		3,022,276
Old Dominion Freight Line, Inc.		7,988		1,751,848
TransDigm Group, Inc.		1,114		1,372,002
Veralto Corp.		4,194		371,840
				7,505,915
Information Technology — 42.7%
Advanced Micro Devices, Inc. (a)		19,876		3,587,419
Apple, Inc.		215,897		37,022,018
ASML Holding NV		6,429		6,239,152
Atlassian Corp. Class A (a)		6,599		1,287,531
Bill Holdings, Inc. (a)		11,557		794,197
Canva, Inc. (Acquired 8/16/21-12/17/21, Cost $582,930) (a) (c) (d) (e)		342		364,798
Confluent, Inc. Class A (a)		20,706		631,947
Crowdstrike Holdings, Inc. Class A (a)		3,582		1,148,353
Datadog, Inc. Class A (a)		6,942		858,031
Fortinet, Inc. (a)		5,659		386,566
Gusto, Inc. (Acquired 10/04/21, Cost $193,055) (a) (c) (d) (e)		6,706		103,138
Intuit, Inc.		8,024		5,215,600
Lam Research Corp.		859		834,579
Microsoft Corp.		158,500		66,684,120
MongoDB, Inc. (a)		5,800		2,080,112
Monolithic Power Systems, Inc.		4,059		2,749,648
NVIDIA Corp.		52,793		47,701,643
Roper Technologies, Inc.		5,815		3,261,285
ServiceNow, Inc. (a)		14,354		10,943,490
Shopify, Inc. Class A (a)		35,890		2,769,631
Snowflake, Inc. Class A (a)		4,515		729,624
Synopsys, Inc. (a)		9,947		5,684,710
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR		13,735		1,868,647
TE Connectivity Ltd.		9,988		1,450,657
Texas Instruments, Inc.		4,312		751,193
				205,148,089

MML Blue Chip Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Materials — 0.9%
Linde PLC		4,739	$	2,200,413
Sherwin-Williams Co.		6,343		2,203,114
				4,403,527
Utilities — 0.7%
Constellation Energy Corp.		18,790		3,473,332
TOTAL COMMON STOCK (Cost $280,255,980)				471,638,170
PREFERRED STOCK — 0.2%
Information Technology — 0.2%
Canva, Inc., Series A (Acquired 11/04/21-12/17/21, Cost $37,502) (a) (c) (d) (e)		22		23,467
Canva, Inc., Series A-3 (Acquired 12/17/21, Cost $3,408) (a) (c) (d) (e)		2		2,133
Databricks, Inc., Series G (Acquired 2/01/21, Cost $172,224) (a) (c) (d) (e)		2,913		214,106
Databricks, Inc., Series H (Acquired 8/31/21, Cost $542,974) (a) (c) (d) (e)		7,389		543,092
Gusto, Inc., Series E (Acquired 7/13/21, Cost $254,865) (a) (c) (d) (e)		8,385		128,961
				911,759
TOTAL PREFERRED STOCK (Cost $1,010,973)				911,759
TOTAL EQUITIES (Cost $281,266,953)				472,549,929
	Principal Amount
BONDS & NOTES — 0.2%
CORPORATE DEBT — 0.2%
Retail — 0.2%
Carvana Co.
12.000% 12/01/28 (f)	$	228,862		223,767
13.000% 6/01/30 (f)		345,306		336,751
14.000% 6/01/31 (f)		409,554		411,654
				972,172
TOTAL CORPORATE DEBT (Cost $1,074,881)				972,172
TOTAL BONDS & NOTES (Cost $1,074,881)				972,172
TOTAL LONG-TERM INVESTMENTS (Cost $282,341,834)				473,522,101
	Number of Shares
SHORT-TERM INVESTMENTS — 2.3%
Investment of Cash Collateral from Securities Loaned — 0.0%
State Street Navigator Securities Lending Government Money Market Portfolio (g)		3,450		3,450

MML Blue Chip Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Mutual Fund — 0.0%
T. Rowe Price Government Reserve Investment Fund		109	$	109
	Principal Amount
Repurchase Agreement — 2.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (h)	$	11,001,751		11,001,751
TOTAL SHORT-TERM INVESTMENTS (Cost $11,005,310)				11,005,310
TOTAL INVESTMENTS — 100.8% (Cost $293,347,144) (i)				484,527,411
Other Assets/(Liabilities) — (0.8)%				(3,607,546)
NET ASSETS — 100.0%			$	480,919,865

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 March 31, 2024, was $3,382 or 0.00% of net assets. (Note 2).

(c) Investment is valued using significant unobservable inputs.

(d) Restricted security. Certain securities are restricted to resale. At March 31, 2024, these securities amounted to a value of $1,662,428 or 0.35% of net assets. The Fund generally bears the costs, if any, associated with the disposition of restricted securities.

(e) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At March 31, 2024, these securities amounted to a value of $1,662,428 or 0.35% 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 March 31, 2024, the aggregate market value of these securities amounted to $972,172 or 0.20% of net assets.

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

(h) Maturity value of $11,003,707. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $11,221,817.

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

MML Equity Income Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.1%
COMMON STOCK — 98.3%
Communication Services — 4.7%
AT&T, Inc.		29,946	$	527,049
Comcast Corp. Class A		24,439		1,059,431
News Corp. Class A		283,452		7,420,773
News Corp. Class B		27,147		734,598
Verizon Communications, Inc.		47,733		2,002,877
Walt Disney Co.		41,812		5,116,116
				16,860,844
Consumer Discretionary — 3.0%
Best Buy Co., Inc.		3,200		262,496
Kohl's Corp.		59,827		1,743,957
Las Vegas Sands Corp.		73,318		3,790,540
Mattel, Inc. (a)		94,748		1,876,958
TJX Cos., Inc.		10,847		1,100,103
Volkswagen AG ADR		156,326		2,066,630
				10,840,684
Consumer Staples — 8.1%
Colgate-Palmolive Co.		28,014		2,522,661
Conagra Brands, Inc.		135,095		4,004,216
Constellation Brands, Inc. Class A		1,419		385,627
Dollar General Corp.		5,900		920,754
Kenvue, Inc.		178,761		3,836,211
Kimberly-Clark Corp.		36,886		4,771,204
Mondelez International, Inc. Class A		3,957		276,990
Philip Morris International, Inc.		55,883		5,120,000
Tyson Foods, Inc. Class A		53,079		3,117,330
Walmart, Inc.		68,056		4,094,930
				29,049,923
Energy — 8.7%
Baker Hughes Co.		18,500		619,750
Chevron Corp.		4,586		723,396
ConocoPhillips		9,100		1,158,248
Enbridge, Inc.		55,979		2,025,320
EOG Resources, Inc.		19,600		2,505,664
EQT Corp.		58,900		2,183,423
Exxon Mobil Corp.		47,611		5,534,303
Hess Corp.		16,106		2,458,420
Suncor Energy, Inc.		56,000		2,066,960
TC Energy Corp. (b)		28,828		1,158,885
TotalEnergies SE		114,537		7,875,564
TotalEnergies SE Sponsored ADR		21,700		1,493,611

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Williams Cos., Inc.		40,400	$	1,574,388
				31,377,932
Financials — 23.3%
American International Group, Inc.		111,903		8,747,458
Apollo Global Management, Inc.		9,500		1,068,275
Bank of America Corp.		51,209		1,941,845
Bank of New York Mellon Corp.		13,000		749,060
Charles Schwab Corp.		79,372		5,741,770
Chubb Ltd.		30,526		7,910,202
Citigroup, Inc.		58,840		3,721,042
Equitable Holdings, Inc.		158,457		6,022,951
Fifth Third Bancorp		124,234		4,622,747
Fiserv, Inc. (a)		27,353		4,371,556
Goldman Sachs Group, Inc.		2,856		1,192,923
Hartford Financial Services Group, Inc.		45,169		4,654,665
Huntington Bancshares, Inc.		255,640		3,566,178
JP Morgan Chase & Co.		23,868		4,780,760
Loews Corp.		48,040		3,761,052
MetLife, Inc.		75,506		5,595,750
Morgan Stanley		14,629		1,377,467
US Bancorp		82,804		3,701,339
Wells Fargo & Co.		184,573		10,697,851
				84,224,891
Health Care — 15.8%
AbbVie, Inc.		10,391		1,892,201
AstraZeneca PLC Sponsored ADR		37,861		2,565,083
Becton Dickinson & Co.		24,674		6,105,581
Biogen, Inc. (a)		4,900		1,056,587
Bristol-Myers Squibb Co.		24,000		1,301,520
Cardinal Health, Inc.		4,918		550,324
Centene Corp. (a)		10,044		788,253
Cigna Group		12,530		4,550,771
CVS Health Corp.		51,313		4,092,725
Elevance Health, Inc.		17,184		8,910,591
GE HealthCare Technologies, Inc. (a)		16,864		1,533,106
Humana, Inc.		800		277,376
Johnson & Johnson		24,791		3,921,688
Medtronic PLC		35,045		3,054,172
Merck & Co., Inc.		27,466		3,624,139
Pfizer, Inc.		82,247		2,282,354
Sanofi SA		21,738		2,132,875
Sanofi SA ADR		6,897		335,194
Viatris, Inc.		224,707		2,683,002
Zimmer Biomet Holdings, Inc.		39,231		5,177,708
				56,835,250
Industrials — 12.3%
3M Co.		8,387		889,609
Boeing Co. (a)		23,056		4,449,577
Cummins, Inc.		6,400		1,885,760
Flowserve Corp.		1,010		46,137
General Electric Co.		49,854		8,750,873
Honeywell International, Inc.		5,000		1,026,250
L3Harris Technologies, Inc.		28,738		6,124,068

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Norfolk Southern Corp.		10,900	$	2,778,083
Siemens AG Sponsored ADR		48,016		4,582,167
Southwest Airlines Co.		100,203		2,924,926
Stanley Black & Decker, Inc.		50,114		4,907,664
Stericycle, Inc. (a)		20,663		1,089,973
Union Pacific Corp.		6,969		1,713,886
United Parcel Service, Inc. Class B		22,599		3,358,889
				44,527,862
Information Technology — 9.4%
Accenture PLC Class A		5,059		1,753,500
Advanced Micro Devices, Inc. (a)		1,600		288,784
Applied Materials, Inc.		22,787		4,699,363
Cisco Systems, Inc.		12,794		638,549
Intel Corp.		27,800		1,227,926
Microsoft Corp.		14,300		6,016,296
QUALCOMM, Inc.		63,534		10,756,306
Samsung Electronics Co. Ltd.		57,811		3,461,423
TE Connectivity Ltd.		14,863		2,158,702
Texas Instruments, Inc.		17,522		3,052,508
				34,053,357
Materials — 3.0%
CF Industries Holdings, Inc.		73,925		6,151,299
International Flavors & Fragrances, Inc.		7,592		652,836
International Paper Co.		103,127		4,024,016
				10,828,151
Real Estate — 4.1%
Equity Residential		76,287		4,814,473
Rayonier, Inc.		88,780		2,951,047
Rexford Industrial Realty, Inc.		15,845		797,004
Vornado Realty Trust		5,843		168,103
Weyerhaeuser Co.		165,884		5,956,894
				14,687,521
Utilities — 5.9%
Ameren Corp.		34,296		2,536,532
Dominion Energy, Inc.		86,744		4,266,938
NextEra Energy, Inc.		39,087		2,498,050
NiSource, Inc.		20,724		573,226
PG&E Corp.		31,053		520,448
Sempra		35,857		2,575,608
Southern Co.		114,278		8,198,304
				21,169,106
TOTAL COMMON STOCK (Cost $260,461,226)				354,455,521
PREFERRED STOCK — 0.8%
Consumer Discretionary — 0.6%
Dr Ing hc F Porsche AG 1.094% (c)		23,401		2,329,418

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Utilities — 0.2%
NextEra Energy, Inc. Convertible 6.926% 6.926% (b)		15,955	$	621,128
TOTAL PREFERRED STOCK (Cost $3,005,058)				2,950,546
TOTAL EQUITIES (Cost $263,466,284)				357,406,067
TOTAL LONG-TERM INVESTMENTS (Cost $263,466,284)				357,406,067
SHORT-TERM INVESTMENTS — 1.2%
Investment of Cash Collateral from Securities Loaned — 0.5%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		1,805,085		1,805,085
Mutual Fund — 0.0%
T. Rowe Price Government Reserve Investment Fund		107		107
	Principal Amount
Repurchase Agreement — 0.7%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (e)	$	2,534,992		2,534,992
TOTAL SHORT-TERM INVESTMENTS (Cost $4,340,184)				4,340,184
TOTAL INVESTMENTS — 100.3% (Cost $267,806,468) (f)				361,746,251
Other Assets/(Liabilities) — (0.3)%				(1,113,386)
NET ASSETS — 100.0%			$	360,632,865

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 March 31, 2024, was $1,762,167 or 0.49% of net assets. (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 March 31, 2024, the aggregate market value of these securities amounted to $2,329,418 or 0.65% of net assets.

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

(e) Maturity value of $2,535,442. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $2,585,704.

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

MML Equity Index Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.2%
COMMON STOCK — 99.2%
Communication Services — 8.9%
Alphabet, Inc. Class A (a)		94,271	$	14,228,322
Alphabet, Inc. Class C (a)		78,926		12,017,273
AT&T, Inc.		114,379		2,013,070
Charter Communications, Inc. Class A (a)		1,580		459,195
Comcast Corp. Class A		63,387		2,747,826
Electronic Arts, Inc.		3,892		516,352
Fox Corp. Class A		3,828		119,702
Fox Corp. Class B		2,113		60,474
Interpublic Group of Cos., Inc.		6,127		199,924
Live Nation Entertainment, Inc. (a)		2,270		240,098
Match Group, Inc. (a)		4,357		158,072
Meta Platforms, Inc. Class A		35,194		17,089,502
Netflix, Inc. (a)		6,923		4,204,546
News Corp. Class A		6,084		159,279
News Corp. Class B		1,834		49,628
Omnicom Group, Inc.		3,175		307,213
Paramount Global Class B		7,763		91,370
T-Mobile US, Inc.		8,354		1,363,540
Take-Two Interactive Software, Inc. (a)		2,538		376,868
Verizon Communications, Inc.		67,256		2,822,062
Walt Disney Co.		29,344		3,590,532
Warner Bros Discovery, Inc. (a)		35,499		309,906
				63,124,754
Consumer Discretionary — 10.3%
Airbnb, Inc. Class A (a)		6,968		1,149,441
Amazon.com, Inc. (a)		146,228		26,376,607
Aptiv PLC (a)		4,464		355,558
AutoZone, Inc. (a)		277		873,007
Bath & Body Works, Inc.		3,632		181,673
Best Buy Co., Inc.		3,067		251,586
Booking Holdings, Inc.		558		2,024,357
BorgWarner, Inc.		3,676		127,704
Caesars Entertainment, Inc. (a)		3,476		152,040
CarMax, Inc. (a)		2,526		220,040
Carnival Corp. (a)		16,117		263,352
Chipotle Mexican Grill, Inc. (a)		439		1,276,072
Darden Restaurants, Inc.		1,910		319,256
Deckers Outdoor Corp. (a)		411		386,858
Domino's Pizza, Inc.		558		277,259
DR Horton, Inc.		4,777		786,055
eBay, Inc.		8,313		438,760
Etsy, Inc. (a)		1,921		132,011
Expedia Group, Inc. (a)		2,092		288,173
Ford Motor Co.		62,433		829,110
Garmin Ltd.		2,449		364,583

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
General Motors Co.		18,468	$	837,524
Genuine Parts Co.		2,243		347,508
Hasbro, Inc.		2,101		118,748
Hilton Worldwide Holdings, Inc.		4,034		860,492
Home Depot, Inc.		15,921		6,107,296
Las Vegas Sands Corp.		5,907		305,392
Lennar Corp. Class A		3,954		680,009
LKQ Corp.		4,281		228,648
Lowe's Cos., Inc.		9,200		2,343,516
Lululemon Athletica, Inc. (a)		1,837		717,624
Marriott International, Inc. Class A		3,946		995,615
McDonald's Corp.		11,603		3,271,466
MGM Resorts International (a)		4,395		207,488
Mohawk Industries, Inc. (a)		850		111,256
NIKE, Inc. Class B		19,472		1,829,979
Norwegian Cruise Line Holdings Ltd. (a) (b)		6,806		142,450
NVR, Inc. (a)		51		413,098
O'Reilly Automotive, Inc. (a)		945		1,066,792
Pool Corp.		620		250,170
PulteGroup, Inc.		3,393		409,264
Ralph Lauren Corp.		625		117,350
Ross Stores, Inc.		5,386		790,449
Royal Caribbean Cruises Ltd. (a)		3,774		524,624
Starbucks Corp.		18,112		1,655,256
Tapestry, Inc.		3,669		174,204
Tesla, Inc. (a)		44,324		7,791,716
TJX Cos., Inc.		18,232		1,849,089
Tractor Supply Co.		1,730		452,776
Ulta Beauty, Inc. (a)		777		406,278
VF Corp.		5,321		81,624
Wynn Resorts Ltd.		1,524		155,798
Yum! Brands, Inc.		4,500		623,925
				72,940,926
Consumer Staples — 5.9%
Altria Group, Inc.		28,210		1,230,520
Archer-Daniels-Midland Co.		8,533		535,958
Brown-Forman Corp. Class B		2,893		149,337
Bunge Global SA		2,316		237,436
Campbell Soup Co.		3,135		139,351
Church & Dwight Co., Inc.		3,941		411,086
Clorox Co.		1,985		303,923
Coca-Cola Co.		62,246		3,808,210
Colgate-Palmolive Co.		13,172		1,186,139
Conagra Brands, Inc.		7,647		226,657
Constellation Brands, Inc. Class A		2,573		699,238
Costco Wholesale Corp.		7,098		5,200,208
Dollar General Corp.		3,515		548,551
Dollar Tree, Inc. (a)		3,311		440,860
Estee Lauder Cos., Inc. Class A		3,725		574,209
General Mills, Inc.		9,085		635,677
Hershey Co.		2,398		466,411
Hormel Foods Corp.		4,636		161,750
J. M. Smucker Co.		1,698		213,727
Kellanova		4,219		241,706
Kenvue, Inc.		27,571		591,674
Keurig Dr Pepper, Inc.		16,661		510,993
Kimberly-Clark Corp.		5,389		697,067

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Kraft Heinz Co.		12,754	$	470,623
Kroger Co.		10,590		605,007
Lamb Weston Holdings, Inc.		2,310		246,084
McCormick & Co., Inc.		4,022		308,930
Molson Coors Beverage Co. Class B		2,962		199,194
Mondelez International, Inc. Class A		21,540		1,507,800
Monster Beverage Corp. (a)		11,817		700,512
PepsiCo, Inc.		21,987		3,847,945
Philip Morris International, Inc.		24,835		2,275,383
Procter & Gamble Co.		37,642		6,107,414
Sysco Corp.		7,964		646,518
Target Corp.		7,385		1,308,696
Tyson Foods, Inc. Class A		4,581		269,042
Walgreens Boots Alliance, Inc.		11,450		248,350
Walmart, Inc.		68,478		4,120,321
				42,072,507
Energy — 3.9%
APA Corp.		5,778		198,648
Baker Hughes Co.		16,011		536,369
Chevron Corp.		27,746		4,376,654
ConocoPhillips		18,846		2,398,719
Coterra Energy, Inc.		12,075		336,651
Devon Energy Corp.		10,249		514,295
Diamondback Energy, Inc.		2,863		567,361
EOG Resources, Inc.		9,329		1,192,619
EQT Corp.		6,538		242,364
Exxon Mobil Corp.		63,525		7,384,146
Halliburton Co.		14,239		561,301
Hess Corp.		4,403		672,074
Kinder Morgan, Inc.		30,935		567,348
Marathon Oil Corp.		9,362		265,319
Marathon Petroleum Corp.		5,887		1,186,230
Occidental Petroleum Corp.		10,529		684,280
ONEOK, Inc.		9,319		747,104
Phillips 66		6,879		1,123,616
Pioneer Natural Resources Co.		3,737		980,962
Schlumberger NV		22,834		1,251,532
Targa Resources Corp.		3,567		399,468
Valero Energy Corp.		5,446		929,578
Williams Cos., Inc.		19,460		758,356
				27,874,994
Financials — 13.0%
Aflac, Inc.		8,421		723,027
Allstate Corp.		4,199		726,469
American Express Co.		9,148		2,082,908
American International Group, Inc.		11,231		877,927
Ameriprise Financial, Inc.		1,603		702,819
Aon PLC Class A		3,203		1,068,905
Arch Capital Group Ltd. (a)		5,935		548,631
Arthur J Gallagher & Co.		3,468		867,139
Assurant, Inc.		831		156,427
Bank of America Corp.		110,139		4,176,471
Bank of New York Mellon Corp.		12,147		699,910
Berkshire Hathaway, Inc. Class B (a)		29,106		12,239,655
BlackRock, Inc.		2,237		1,864,987

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Blackstone, Inc.		11,508	$	1,511,806
Brown & Brown, Inc.		3,779		330,814
Capital One Financial Corp.		6,085		905,996
Cboe Global Markets, Inc.		1,689		310,320
Charles Schwab Corp.		23,807		1,722,198
Chubb Ltd.		6,483		1,679,940
Cincinnati Financial Corp.		2,512		311,915
Citigroup, Inc.		30,444		1,925,279
Citizens Financial Group, Inc.		7,456		270,578
CME Group, Inc.		5,759		1,239,855
Comerica, Inc.		2,122		116,689
Corpay, Inc. (a)		1,150		354,821
Discover Financial Services		4,000		524,360
Everest Group Ltd.		695		276,262
FactSet Research Systems, Inc.		610		277,178
Fidelity National Information Services, Inc.		9,478		703,078
Fifth Third Bancorp		10,896		405,440
Fiserv, Inc. (a)		9,601		1,534,432
Franklin Resources, Inc.		4,801		134,956
Global Payments, Inc.		4,165		556,694
Globe Life, Inc.		1,366		158,961
Goldman Sachs Group, Inc.		5,217		2,179,089
Hartford Financial Services Group, Inc.		4,775		492,064
Huntington Bancshares, Inc.		23,169		323,208
Intercontinental Exchange, Inc.		9,160		1,258,859
Invesco Ltd.		7,191		119,299
Jack Henry & Associates, Inc.		1,166		202,569
JP Morgan Chase & Co.		46,248		9,263,474
KeyCorp.		14,982		236,865
Loews Corp.		2,922		228,763
M&T Bank Corp.		2,658		386,579
MarketAxess Holdings, Inc.		609		133,523
Marsh & McLennan Cos., Inc.		7,871		1,621,269
Mastercard, Inc. Class A		13,198		6,355,761
MetLife, Inc.		9,820		727,760
Moody's Corp.		2,518		989,650
Morgan Stanley		20,041		1,887,061
MSCI, Inc.		1,265		708,969
Nasdaq, Inc.		6,079		383,585
Northern Trust Corp.		3,281		291,747
PayPal Holdings, Inc. (a)		17,145		1,148,544
PNC Financial Services Group, Inc.		6,367		1,028,907
Principal Financial Group, Inc.		3,509		302,862
Progressive Corp.		9,363		1,936,456
Prudential Financial, Inc.		5,775		677,985
Raymond James Financial, Inc.		3,009		386,416
Regions Financial Corp.		14,781		310,992
S&P Global, Inc.		5,140		2,186,813
State Street Corp.		4,830		373,456
Synchrony Financial		6,508		280,625
T. Rowe Price Group, Inc.		3,582		436,717
Travelers Cos., Inc.		3,651		840,241
Truist Financial Corp.		21,336		831,677
US Bancorp		24,908		1,113,388
Visa, Inc. Class A		25,301		7,061,003
W. R. Berkley Corp.		3,248		287,253
Wells Fargo & Co.		57,571		3,336,815

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Willis Towers Watson PLC		1,640	$	451,000
				92,768,091
Health Care — 12.3%
Abbott Laboratories		27,772		3,156,565
AbbVie, Inc.		28,244		5,143,232
Agilent Technologies, Inc.		4,688		682,151
Align Technology, Inc. (a)		1,139		373,501
Amgen, Inc.		8,558		2,433,211
Baxter International, Inc.		8,124		347,220
Becton Dickinson & Co.		4,622		1,143,714
Bio-Rad Laboratories, Inc. Class A (a)		335		115,866
Bio-Techne Corp.		2,515		177,031
Biogen, Inc. (a)		2,318		499,830
Boston Scientific Corp. (a)		23,436		1,605,132
Bristol-Myers Squibb Co.		32,550		1,765,186
Cardinal Health, Inc.		3,891		435,403
Catalent, Inc. (a)		2,891		163,197
Cencora, Inc.		2,649		643,680
Centene Corp. (a)		8,550		671,004
Charles River Laboratories International, Inc. (a)		821		222,450
Cigna Group		4,679		1,699,366
The Cooper Cos., Inc.		3,179		322,541
CVS Health Corp.		20,132		1,605,728
Danaher Corp.		10,520		2,627,054
DaVita, Inc. (a)		866		119,551
DENTSPLY SIRONA, Inc.		3,389		112,481
Dexcom, Inc. (a)		6,167		855,363
Edwards Lifesciences Corp. (a)		9,702		927,123
Elevance Health, Inc.		3,759		1,949,192
Eli Lilly & Co.		12,756		9,923,658
GE HealthCare Technologies, Inc. (a)		6,774		615,824
Gilead Sciences, Inc.		19,932		1,460,019
HCA Healthcare, Inc.		3,169		1,056,957
Henry Schein, Inc. (a)		2,079		157,006
Hologic, Inc. (a)		3,755		292,740
Humana, Inc.		1,955		677,838
IDEXX Laboratories, Inc. (a)		1,329		717,567
Illumina, Inc. (a)		2,540		348,793
Incyte Corp. (a)		2,976		169,543
Insulet Corp. (a)		1,117		191,454
Intuitive Surgical, Inc. (a)		5,636		2,249,271
IQVIA Holdings, Inc. (a)		2,919		738,186
Johnson & Johnson		38,510		6,091,897
Laboratory Corp. of America Holdings		1,358		296,669
McKesson Corp.		2,102		1,128,459
Medtronic PLC		21,271		1,853,768
Merck & Co., Inc.		40,537		5,348,857
Mettler-Toledo International, Inc. (a)		344		457,964
Moderna, Inc. (a)		5,316		566,473
Molina Healthcare, Inc. (a)		928		381,250
Pfizer, Inc.		90,326		2,506,546
Quest Diagnostics, Inc.		1,776		236,403
Regeneron Pharmaceuticals, Inc. (a)		1,690		1,626,608
ResMed, Inc.		2,355		466,361
Revvity, Inc.		1,979		207,795
STERIS PLC		1,585		356,340
Stryker Corp.		5,409		1,935,719

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Teleflex, Inc.		752	$	170,080
Thermo Fisher Scientific, Inc.		6,181		3,592,459
UnitedHealth Group, Inc.		14,796		7,319,581
Universal Health Services, Inc. Class B		976		178,081
Vertex Pharmaceuticals, Inc. (a)		4,122		1,723,037
Viatris, Inc.		19,191		229,140
Waters Corp. (a)		946		325,642
West Pharmaceutical Services, Inc.		1,184		468,521
Zimmer Biomet Holdings, Inc.		3,343		441,209
Zoetis, Inc.		7,344		1,242,678
				87,547,165
Industrials — 8.7%
3M Co.		8,842		937,871
A.O. Smith Corp.		1,956		174,984
Allegion PLC		1,404		189,133
American Airlines Group, Inc. (a)		10,466		160,653
AMETEK, Inc.		3,692		675,267
Automatic Data Processing, Inc.		6,571		1,641,042
Axon Enterprise, Inc. (a)		1,127		352,616
Boeing Co. (a)		9,175		1,770,683
Broadridge Financial Solutions, Inc.		1,887		386,571
Builders FirstSource, Inc. (a)		1,969		410,635
C.H. Robinson Worldwide, Inc.		1,866		142,077
Carrier Global Corp.		13,365		776,907
Caterpillar, Inc.		8,144		2,984,206
Cintas Corp.		1,378		946,727
Copart, Inc. (a)		13,978		809,606
CSX Corp.		31,612		1,171,857
Cummins, Inc.		2,180		642,337
Dayforce, Inc. (a)		2,513		166,386
Deere & Co.		4,166		1,711,143
Delta Air Lines, Inc.		10,244		490,380
Dover Corp.		2,238		396,551
Eaton Corp. PLC		6,388		1,997,400
Emerson Electric Co.		9,146		1,037,339
Equifax, Inc.		1,972		527,549
Expeditors International of Washington, Inc.		2,326		282,772
Fastenal Co.		9,154		706,140
FedEx Corp.		3,678		1,065,664
Fortive Corp.		5,610		482,572
Generac Holdings, Inc. (a)		983		123,996
General Dynamics Corp.		3,632		1,026,004
General Electric Co.		17,410		3,055,977
Honeywell International, Inc.		10,546		2,164,566
Howmet Aerospace, Inc.		6,257		428,166
Hubbell, Inc.		858		356,113
Huntington Ingalls Industries, Inc.		633		184,501
IDEX Corp.		1,210		295,264
Illinois Tool Works, Inc.		4,350		1,167,235
Ingersoll Rand, Inc.		6,476		614,896
Jacobs Solutions, Inc.		2,018		310,227
JB Hunt Transport Services, Inc.		1,304		259,822
Johnson Controls International PLC		10,909		712,576
L3Harris Technologies, Inc.		3,032		646,119
Leidos Holdings, Inc.		2,200		288,398
Lockheed Martin Corp.		3,440		1,564,753
Masco Corp.		3,516		277,342

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Nordson Corp.		868	$	238,301
Norfolk Southern Corp.		3,613		920,845
Northrop Grumman Corp.		2,256		1,079,857
Old Dominion Freight Line, Inc.		2,862		627,665
Otis Worldwide Corp.		6,486		643,865
PACCAR, Inc.		8,368		1,036,712
Parker-Hannifin Corp.		2,054		1,141,593
Paychex, Inc.		5,123		629,104
Paycom Software, Inc.		769		153,039
Pentair PLC		2,644		225,903
Quanta Services, Inc.		2,324		603,775
Republic Services, Inc.		3,272		626,392
Robert Half, Inc.		1,666		132,080
Rockwell Automation, Inc.		1,833		534,008
Rollins, Inc.		4,491		207,799
RTX Corp.		21,225		2,070,074
Snap-on, Inc.		844		250,010
Southwest Airlines Co.		9,545		278,619
Stanley Black & Decker, Inc.		2,453		240,222
Textron, Inc.		3,145		301,700
Trane Technologies PLC		3,640		1,092,728
TransDigm Group, Inc.		891		1,097,356
Uber Technologies, Inc. (a)		32,920		2,534,511
Union Pacific Corp.		9,755		2,399,047
United Airlines Holdings, Inc. (a)		5,247		251,226
United Parcel Service, Inc. Class B		11,570		1,719,649
United Rentals, Inc.		1,075		775,193
Veralto Corp.		3,508		311,019
Verisk Analytics, Inc.		2,319		546,658
W.W. Grainger, Inc.		707		719,231
Waste Management, Inc.		5,863		1,249,698
Westinghouse Air Brake Technologies Corp.		2,866		417,519
Xylem, Inc.		3,857		498,479
				62,066,900
Information Technology — 29.3%
Accenture PLC Class A		10,030		3,476,498
Adobe, Inc. (a)		7,231		3,648,763
Advanced Micro Devices, Inc. (a)		25,848		4,665,305
Akamai Technologies, Inc. (a)		2,413		262,438
Amphenol Corp. Class A		9,596		1,106,899
Analog Devices, Inc.		7,932		1,568,870
ANSYS, Inc. (a)		1,390		482,552
Apple, Inc.		232,204		39,818,342
Applied Materials, Inc.		13,311		2,745,127
Arista Networks, Inc. (a)		4,031		1,168,909
Autodesk, Inc. (a)		3,422		891,157
Broadcom, Inc.		7,040		9,330,886
Cadence Design Systems, Inc. (a)		4,352		1,354,691
CDW Corp.		2,143		548,137
Cisco Systems, Inc.		65,004		3,244,350
Cognizant Technology Solutions Corp. Class A		7,967		583,901
Corning, Inc.		12,284		404,881
Enphase Energy, Inc. (a)		2,172		262,769
EPAM Systems, Inc. (a)		923		254,896
F5, Inc. (a)		941		178,404
Fair Isaac Corp. (a)		398		497,345
First Solar, Inc. (a)		1,709		288,479

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Fortinet, Inc. (a)		10,196	$	696,489
Gartner, Inc. (a)		1,247		594,407
Gen Digital, Inc.		8,964		200,794
Hewlett Packard Enterprise Co.		20,796		368,713
HP, Inc.		13,949		421,539
Intel Corp.		67,636		2,987,482
International Business Machines Corp.		14,638		2,795,272
Intuit, Inc.		4,478		2,910,700
Jabil, Inc.		2,036		272,722
Juniper Networks, Inc.		5,150		190,859
Keysight Technologies, Inc. (a)		2,794		436,926
KLA Corp.		2,163		1,511,007
Lam Research Corp.		2,097		2,037,382
Microchip Technology, Inc.		8,645		775,543
Micron Technology, Inc.		17,659		2,081,819
Microsoft Corp.		118,866		50,009,303
Monolithic Power Systems, Inc.		768		520,259
Motorola Solutions, Inc.		2,655		942,472
NetApp, Inc.		3,296		345,981
NVIDIA Corp.		39,513		35,702,366
NXP Semiconductors NV		4,123		1,021,556
ON Semiconductor Corp. (a)		6,836		502,788
Oracle Corp.		25,505		3,203,683
Palo Alto Networks, Inc. (a)		5,044		1,433,152
PTC, Inc. (a)		1,912		361,253
Qorvo, Inc. (a)		1,544		177,297
QUALCOMM, Inc.		17,853		3,022,513
Roper Technologies, Inc.		1,709		958,476
Salesforce, Inc.		15,485		4,663,772
Seagate Technology Holdings PLC		3,122		290,502
ServiceNow, Inc. (a)		3,279		2,499,910
Skyworks Solutions, Inc.		2,563		277,624
Super Micro Computer, Inc. (a)		805		813,074
Synopsys, Inc. (a)		2,440		1,394,460
TE Connectivity Ltd.		4,940		717,486
Teledyne Technologies, Inc. (a)		755		324,137
Teradyne, Inc.		2,446		275,982
Texas Instruments, Inc.		14,546		2,534,059
Trimble, Inc. (a)		3,980		256,153
Tyler Technologies, Inc. (a)		674		286,457
VeriSign, Inc. (a)		1,412		267,588
Western Digital Corp. (a)		5,187		353,961
Zebra Technologies Corp. Class A (a)		822		247,784
				208,469,301
Materials — 2.4%
Air Products & Chemicals, Inc.		3,556		861,512
Albemarle Corp. (b)		1,877		247,276
Amcor PLC		23,153		220,185
Avery Dennison Corp.		1,288		287,546
Ball Corp.		5,044		339,764
Celanese Corp.		1,602		275,320
CF Industries Holdings, Inc.		3,056		254,290
Corteva, Inc.		11,227		647,461
Dow, Inc.		11,235		650,843
DuPont de Nemours, Inc.		6,881		527,566
Eastman Chemical Co.		1,876		188,013
Ecolab, Inc.		4,060		937,454

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
FMC Corp.		1,996	$	127,145
Freeport-McMoRan, Inc.		22,939		1,078,592
International Flavors & Fragrances, Inc.		4,084		351,183
International Paper Co.		5,535		215,976
Linde PLC		7,757		3,601,730
LyondellBasell Industries NV Class A		4,095		418,836
Martin Marietta Materials, Inc.		989		607,187
Mosaic Co.		5,215		169,279
Newmont Corp.		18,437		660,782
Nucor Corp.		3,933		778,341
Packaging Corp. of America		1,428		271,006
PPG Industries, Inc.		3,772		546,563
Sherwin-Williams Co.		3,767		1,308,392
Steel Dynamics, Inc.		2,433		360,643
Vulcan Materials Co.		2,126		580,228
Westrock Co.		4,111		203,289
				16,716,402
Real Estate — 2.3%
Alexandria Real Estate Equities, Inc.		2,518		324,595
American Tower Corp.		7,457		1,473,429
AvalonBay Communities, Inc.		2,269		421,036
Boston Properties, Inc.		2,313		151,062
Camden Property Trust		1,708		168,067
CBRE Group, Inc. Class A (a)		4,757		462,571
CoStar Group, Inc. (a)		6,533		631,088
Crown Castle, Inc.		6,938		734,249
Digital Realty Trust, Inc.		4,845		697,874
Equinix, Inc.		1,502		1,239,646
Equity Residential		5,530		348,998
Essex Property Trust, Inc.		1,027		251,420
Extra Space Storage, Inc.		3,380		496,860
Federal Realty Investment Trust		1,175		119,991
Healthpeak Properties, Inc.		11,394		213,637
Host Hotels & Resorts, Inc.		11,271		233,084
Invitation Homes, Inc.		9,202		327,683
Iron Mountain, Inc.		4,671		374,661
Kimco Realty Corp.		10,656		208,964
Mid-America Apartment Communities, Inc.		1,867		245,660
Prologis, Inc.		14,781		1,924,782
Public Storage		2,532		734,432
Realty Income Corp.		13,304		719,746
Regency Centers Corp.		2,628		159,152
SBA Communications Corp.		1,726		374,024
Simon Property Group, Inc.		5,214		815,939
UDR, Inc.		4,841		181,102
Ventas, Inc.		6,437		280,267
VICI Properties, Inc.		16,550		493,024
Welltower, Inc.		8,854		827,318
Weyerhaeuser Co.		11,674		419,213
				16,053,574
Utilities — 2.2%
AES Corp.		10,712		192,066
Alliant Energy Corp.		4,075		205,380
Ameren Corp.		4,206		311,076
American Electric Power Co., Inc.		8,412		724,273

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
American Water Works Co., Inc.		3,115	$	380,684
Atmos Energy Corp.		2,413		286,833
CenterPoint Energy, Inc.		10,098		287,692
CMS Energy Corp.		4,729		285,348
Consolidated Edison, Inc.		5,523		501,544
Constellation Energy Corp.		5,109		944,399
Dominion Energy, Inc.		13,386		658,457
DTE Energy Co.		3,303		370,398
Duke Energy Corp.		12,334		1,192,821
Edison International		6,132		433,716
Entergy Corp.		3,383		357,515
Evergy, Inc.		3,675		196,172
Eversource Energy		5,588		333,995
Exelon Corp.		15,924		598,265
FirstEnergy Corp.		8,261		319,040
NextEra Energy, Inc.		32,821		2,097,590
NiSource, Inc.		6,613		182,916
NRG Energy, Inc.		3,612		244,496
PG&E Corp.		34,130		572,019
Pinnacle West Capital Corp.		1,814		135,560
PPL Corp.		11,792		324,634
Public Service Enterprise Group, Inc.		7,972		532,370
Sempra		10,067		723,113
Southern Co.		17,447		1,251,648
WEC Energy Group, Inc.		5,050		414,706
Xcel Energy, Inc.		8,827		474,451
				15,533,177
TOTAL COMMON STOCK (Cost $324,232,082)				705,167,791
TOTAL EQUITIES (Cost $324,232,082)				705,167,791
TOTAL LONG-TERM INVESTMENTS (Cost $324,232,082)				705,167,791
	Principal Amount
SHORT-TERM INVESTMENTS — 0.7%
Repurchase Agreement — 0.7%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (c)	$	4,932,522		4,932,522
U.S. Treasury Bill — 0.0%
U.S. Treasury Bills
5.320% 4/11/24 (d) (e)		10,000		9,981
5.331% 4/11/24 (d) (e)		10,000		9,981
5.341% 4/11/24 (d) (e)		10,000		9,981
5.345% 4/11/24 (d) (e)		185,000		184,650
5.386% 4/11/24 (d) (e)		20,000		19,962
5.413% 4/11/24 (d) (e)		5,000		4,991
5.505% 4/11/24 (d) (e)		55,000		54,896

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
5.524% 4/11/24 (d) (e)	$	5,000	$	4,991
				299,433
TOTAL SHORT-TERM INVESTMENTS (Cost $5,232,085)				5,231,955
TOTAL INVESTMENTS — 99.9% (Cost $329,464,167) (f)				710,399,746
Other Assets/(Liabilities) — 0.1%				454,094
NET ASSETS — 100.0%			$	710,853,840

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 March 31, 2024, was $191,857 or 0.03% of net assets. The Fund received $198,795 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 $4,933,399. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $5,031,196.

(d) The rate shown represents yield-to-maturity.

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

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

Futures contracts
	Expiration Date	Number of Contracts		Notional Amount		Value/Net Unrealized Appreciation (Depreciation)
Long
S&P 500 E Mini Index	6/21/24		21	$	5,443,063	$	130,862

MML Focused Equity Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 97.0%
COMMON STOCK — 97.0%
Consumer Discretionary — 12.0%
McDonald's Corp.		41,205	$	11,617,750
NIKE, Inc. Class B		79,492		7,470,658
TJX Cos., Inc.		157,862		16,010,364
				35,098,772
Consumer Staples — 13.4%
Coca-Cola Co.		80,686		4,936,369
Colgate-Palmolive Co.		120,504		10,851,385
PepsiCo, Inc.		67,004		11,726,370
Procter & Gamble Co.		72,430		11,751,768
				39,265,892
Financials — 20.0%
American Express Co.		66,232		15,080,364
Chubb Ltd.		45,796		11,867,117
Marsh & McLennan Cos., Inc.		58,159		11,979,591
Mastercard, Inc. Class A		12,819		6,173,246
Visa, Inc. Class A		48,171		13,443,563
				58,543,881
Health Care — 16.3%
Danaher Corp.		59,195		14,782,175
Medtronic PLC		79,999		6,971,913
Stryker Corp.		33,189		11,877,347
UnitedHealth Group, Inc.		28,401		14,049,975
				47,681,410
Industrials — 12.7%
Honeywell International, Inc.		58,001		11,904,705
Lockheed Martin Corp.		10,572		4,808,886
Northrop Grumman Corp.		30,765		14,725,975
Union Pacific Corp.		23,148		5,692,788
				37,132,354
Information Technology — 13.3%
Accenture PLC Class A		33,203		11,508,492
Microsoft Corp.		34,672		14,587,204
Texas Instruments, Inc.		74,900		13,048,329
				39,144,025
Materials — 4.7%
Linde PLC		30,034		13,945,387
Real Estate — 4.6%
American Tower Corp.		68,938		13,621,459
TOTAL COMMON STOCK (Cost $229,315,315)				284,433,180
TOTAL EQUITIES (Cost $229,315,315)				284,433,180
TOTAL LONG-TERM INVESTMENTS (Cost $229,315,315)				284,433,180
	Principal Amount
SHORT-TERM INVESTMENTS — 2.2%
Repurchase Agreement — 2.2%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (a)	$	6,361,775		6,361,775
TOTAL SHORT-TERM INVESTMENTS (Cost $6,361,775)				6,361,775
TOTAL INVESTMENTS — 99.2% (Cost $235,677,090) (b)				290,794,955
Other Assets/(Liabilities) — 0.8%				2,397,856
NET ASSETS — 100.0%			$	293,192,811

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Maturity value of $6,362,906. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $6,489,034.

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

MML Foreign Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.9%
COMMON STOCK — 98.3%
Australia — 4.7%
BHP Group Ltd.		22,900	$	661,333
Glencore PLC		283,000		1,556,910
Macquarie Group Ltd.		16,000		2,082,419
Santos Ltd.		399,800		2,019,319
Sonic Healthcare Ltd.		57,600		1,103,857
Westpac Banking Corp.		30,800		524,584
Whitehaven Coal Ltd.		105,300		487,205
				8,435,627
Belgium — 3.7%
Anheuser-Busch InBev SA		52,400		3,187,412
Groupe Bruxelles Lambert NV		14,200		1,073,917
KBC Group NV		22,800		1,713,109
Liberty Global Ltd. Class C (a)		37,200		656,208
				6,630,646
Canada — 0.8%
CCL Industries, Inc. Class B (b)		17,900		914,855
TFI International, Inc. (b)		2,800		446,495
				1,361,350
Denmark — 0.5%
Novo Nordisk AS Class B		7,200		922,291
France — 9.8%
Accor SA		41,100		1,918,577
Amundi SA (c)		20,500		1,406,498
Capgemini SE		10,600		2,444,283
Cie de Saint-Gobain SA		17,500		1,357,052
Engie SA		31,500		529,350
Rexel SA		16,300		439,877
Societe Generale SA		64,800		1,743,411
Sodexo SA		16,000		1,371,864
Teleperformance SE		5,900		572,121
TotalEnergies SE (b)		39,100		2,688,516
Veolia Environnement SA		90,612		2,939,708
				17,411,257
Germany — 10.9%
Allianz SE Registered		6,400		1,917,984
BASF SE		21,300		1,216,349
Deutsche Boerse AG		8,100		1,657,343
Deutsche Post AG Registered		46,800		2,015,370
Heidelberg Materials AG		23,700		2,606,921

MML Foreign Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Infineon Technologies AG		56,500	$	1,920,757
K&S AG Registered		31,500		491,333
SAP SE		19,600		3,815,986
Siemens AG Registered		14,100		2,691,761
Zalando SE (a) (c)		38,400		1,097,445
				19,431,249
Hong Kong — 0.7%
CK Asset Holdings Ltd.		282,200		1,162,535
Ireland — 3.9%
AerCap Holdings NV (a)		27,800		2,416,098
AIB Group PLC		320,400		1,625,012
Smurfit Kappa Group PLC		63,100		2,878,475
				6,919,585
Israel — 1.0%
Check Point Software Technologies Ltd. (a)		10,900		1,787,709
Italy — 0.3%
Prysmian SpA		11,400		595,367
Japan — 20.6%
Astellas Pharma, Inc.		128,700		1,383,104
Canon, Inc. (b)		42,800		1,274,067
Denka Co. Ltd. (b)		7,400		115,307
FANUC Corp.		58,500		1,636,182
Fujitsu Ltd.		157,000		2,513,964
Hitachi Ltd.		34,900		3,187,756
Kyocera Corp.		153,200		2,046,233
Nintendo Co. Ltd.		38,900		2,129,109
Olympus Corp.		93,300		1,342,260
ORIX Corp.		128,500		2,809,562
Rakuten Group, Inc. (a)		288,400		1,636,536
Renesas Electronics Corp.		84,900		1,519,570
SBI Holdings, Inc.		91,800		2,405,983
Seven & i Holdings Co. Ltd.		192,000		2,794,707
Sony Group Corp.		36,700		3,145,283
Square Enix Holdings Co. Ltd.		16,200		623,372
Sumitomo Mitsui Financial Group, Inc.		49,800		2,911,331
Toyota Industries Corp.		30,500		3,188,307
				36,662,633
Luxembourg — 0.9%
ArcelorMittal SA		58,400		1,604,398
Eurofins Scientific SE		1,200		76,486
				1,680,884
Netherlands — 5.1%
ASML Holding NV		2,400		2,304,199
EXOR NV		4,900		544,569
Heineken Holding NV		22,800		1,839,384
ING Groep NV Series N		81,900		1,348,819
Koninklijke Philips NV (a)		18,509		371,159
Pluxee NV (a)		16,000		472,968

MML Foreign Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Shell PLC		67,300	$	2,232,916
				9,114,014
Norway — 1.2%
Aker BP ASA		65,573		1,638,773
DNB Bank ASA		23,300		462,532
				2,101,305
Republic of Korea — 2.0%
Samsung Electronics Co. Ltd.		60,700		3,634,402
Singapore — 1.4%
DBS Group Holdings Ltd.		92,600		2,476,790
Sweden — 2.3%
Essity AB Class B (b)		75,900		1,802,490
Husqvarna AB Class B		43,000		367,976
Skandinaviska Enskilda Banken AB Class A		108,000		1,460,752
Volvo AB Class B (b)		20,798		563,272
				4,194,490
Switzerland — 3.1%
ABB Ltd. Registered		13,200		612,648
Cie Financiere Richemont SA Registered Class A		14,000		2,141,639
Julius Baer Group Ltd.		16,400		946,693
Novartis AG Registered		19,000		1,840,043
				5,541,023
United Kingdom — 17.1%
Ashtead Group PLC		23,600		1,677,514
Aviva PLC		177,076		1,111,273
Barratt Developments PLC		135,100		812,488
BP PLC		449,000		2,821,217
Bunzl PLC		25,700		989,671
Burberry Group PLC		30,800		472,518
CK Hutchison Holdings Ltd.		461,500		2,231,129
DCC PLC		28,500		2,074,622
Dowlais Group PLC		325,896		320,773
Entain PLC		80,100		805,163
Inchcape PLC		121,700		1,113,934
Informa PLC		76,800		805,190
Kingfisher PLC		171,900		540,691
Legal & General Group PLC		609,700		1,955,980
Lloyds Banking Group PLC		4,364,100		2,856,724
Pearson PLC		52,400		688,820
Persimmon PLC		46,700		774,850
Reckitt Benckiser Group PLC		36,900		2,099,203
Smith & Nephew PLC		153,600		1,942,335
Tesco PLC		567,005		2,121,791
Unilever PLC		46,400		2,330,029
				30,545,915
United States — 8.3%
CNH Industrial NV		140,700		1,823,472
GSK PLC		103,300		2,218,569

MML Foreign Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Linde PLC		3,700	$	1,717,984
Nestle SA Registered		25,100		2,665,128
Roche Holding AG		12,800		3,267,544
Sanofi SA		22,800		2,237,076
Stellantis NV		30,800		875,407
				14,805,180
TOTAL COMMON STOCK (Cost $158,971,257)				175,414,252
PREFERRED STOCK — 0.6%
Germany — 0.6%
Henkel AG & Co. KGaA 2.487%
		13,200		1,060,849
TOTAL PREFERRED STOCK (Cost $1,030,124)				1,060,849
TOTAL EQUITIES (Cost $160,001,381)				176,475,101
TOTAL LONG-TERM INVESTMENTS (Cost $160,001,381)				176,475,101
SHORT-TERM INVESTMENTS — 2.1%
Investment of Cash Collateral from Securities Loaned — 2.1%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		3,741,838		3,741,838
TOTAL SHORT-TERM INVESTMENTS (Cost $3,741,838)				3,741,838
TOTAL INVESTMENTS — 101.0% (Cost $163,743,219) (e)				180,216,939
Other Assets/(Liabilities) — (1.0)%				(1,832,598)
NET ASSETS — 100.0%			$	178,384,341

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 March 31, 2024, was $6,560,744 or 3.68% of net assets. The Fund received $3,165,410 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 March 31, 2024, the aggregate market value of these securities amounted to $2,503,943 or 1.40% of net assets.

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

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

MML Fundamental Equity Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 96.6%
COMMON STOCK — 96.6%
Communication Services — 11.1%
Alphabet, Inc. Class A (a)		39,082	$	5,898,646
Meta Platforms, Inc. Class A		8,471		4,113,348
Netflix, Inc. (a)		1,994		1,211,016
T-Mobile US, Inc.		6,252		1,020,452
Verizon Communications, Inc.		65,514		2,748,968
Walt Disney Co.		13,076		1,599,979
				16,592,409
Consumer Discretionary — 7.4%
Amazon.com, Inc. (a)		32,756		5,908,527
Aptiv PLC (a)		3,752		298,847
Lowe's Cos., Inc.		3,149		802,145
Mobileye Global, Inc. Class A (a) (b)		23,104		742,794
Starbucks Corp.		14,040		1,283,115
Tesla, Inc. (a)		2,941		516,998
Valvoline, Inc. (a)		33,417		1,489,396
				11,041,822
Consumer Staples — 6.3%
Constellation Brands, Inc. Class A		11,673		3,172,254
Coty, Inc. Class A (a)		73,020		873,319
Philip Morris International, Inc.		34,264		3,139,268
Walmart, Inc.		36,122		2,173,461
				9,358,302
Energy — 4.0%
Chevron Corp.		7,002		1,104,495
Exxon Mobil Corp.		34,758		4,040,270
Marathon Oil Corp.		30,441		862,698
				6,007,463
Financials — 14.2%
American Express Co.		13,442		3,060,609
American International Group, Inc.		32,201		2,517,152
Arthur J Gallagher & Co.		4,611		1,152,934
Charles Schwab Corp.		33,322		2,410,514
Equitable Holdings, Inc.		50,847		1,932,695
Fiserv, Inc. (a)		14,543		2,324,262
JP Morgan Chase & Co.		18,558		3,717,167
M&T Bank Corp.		4,306		626,265
Mastercard, Inc. Class A		4,372		2,105,424

MML Fundamental Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Wells Fargo & Co.		23,924	$	1,386,635
				21,233,657
Health Care — 14.2%
Becton Dickinson & Co.		5,782		1,430,756
Biogen, Inc. (a)		2,558		551,582
Boston Scientific Corp. (a)		21,333		1,461,097
Eli Lilly & Co.		3,287		2,557,154
Gilead Sciences, Inc.		23,192		1,698,814
HCA Healthcare, Inc.		5,635		1,879,442
Lonza Group AG Registered		2,739		1,639,950
Merck & Co., Inc.		19,699		2,599,283
Tenet Healthcare Corp. (a)		14,723		1,547,535
UnitedHealth Group, Inc.		6,221		3,077,529
Zimmer Biomet Holdings, Inc.		21,140		2,790,057
				21,233,199
Industrials — 8.8%
Emerson Electric Co.		19,249		2,183,222
Equifax, Inc.		8,301		2,220,683
Hubbell, Inc.		4,532		1,881,007
Huntington Ingalls Industries, Inc.		2,516		733,339
Otis Worldwide Corp.		11,123		1,104,180
Paylocity Holding Corp. (a)		6,334		1,088,561
Uber Technologies, Inc. (a)		16,704		1,286,041
United Parcel Service, Inc. Class B		17,503		2,601,471
				13,098,504
Information Technology — 25.7%
Amdocs Ltd.		14,458		1,306,569
Apple, Inc.		39,411		6,758,198
Applied Materials, Inc.		14,056		2,898,769
Autodesk, Inc. (a)		5,821		1,515,905
Dell Technologies, Inc. Class C		6,537		745,937
Microsoft Corp.		27,619		11,619,866
NVIDIA Corp.		9,105		8,226,914
ServiceNow, Inc. (a)		3,342		2,547,941
Texas Instruments, Inc.		7,844		1,366,503
Tyler Technologies, Inc. (a)		3,020		1,283,530
				38,270,132
Materials — 1.5%
CRH PLC		9,520		821,195
DuPont de Nemours, Inc.		17,403		1,334,288
				2,155,483
Real Estate — 1.7%
Prologis, Inc.		19,555		2,546,452
Utilities — 1.7%
Ameren Corp.		7,801		576,962
Atmos Energy Corp.		8,919		1,060,201

MML Fundamental Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
FirstEnergy Corp.		22,040	$	851,185
				2,488,348
TOTAL COMMON STOCK (Cost $111,727,945)				144,025,771
TOTAL EQUITIES (Cost $111,727,945)				144,025,771
TOTAL LONG-TERM INVESTMENTS (Cost $111,727,945)				144,025,771
SHORT-TERM INVESTMENTS — 3.0%
Investment of Cash Collateral from Securities Loaned — 0.5%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		762,432		762,432
	Principal Amount
Repurchase Agreement — 2.5%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (d)	$	3,752,079		3,752,079
TOTAL SHORT-TERM INVESTMENTS (Cost $4,514,511)				4,514,511
TOTAL INVESTMENTS — 99.6% (Cost $116,242,456) (e)				148,540,282
Other Assets/(Liabilities) — 0.4%				646,250
NET ASSETS — 100.0%			$	149,186,532

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 March 31, 2024, was $742,794 or 0.50% of net assets. (Note 2).

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

(d) Maturity value of $3,752,746. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $3,827,159.

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

MML Fundamental Value Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.2%
COMMON STOCK — 99.2%
Communication Services — 5.6%
Alphabet, Inc. Class A (a)		34,931	$	5,272,136
Omnicom Group, Inc.		18,879		1,826,732
T-Mobile US, Inc.		14,348		2,341,881
Take-Two Interactive Software, Inc. (a)		4,007		594,999
				10,035,748
Consumer Discretionary — 4.9%
AutoNation, Inc. (a)		5,761		953,906
AutoZone, Inc. (a)		991		3,123,285
Booking Holdings, Inc.		390		1,414,873
LKQ Corp.		9,674		516,688
MGM Resorts International (a)		32,856		1,551,132
Ulta Beauty, Inc. (a)		2,063		1,078,702
				8,638,586
Consumer Staples — 8.4%
Coca-Cola Europacific Partners PLC		14,913		1,043,164
J. M. Smucker Co.		11,073		1,393,759
Kenvue, Inc.		77,388		1,660,746
Keurig Dr Pepper, Inc.		28,096		861,704
Philip Morris International, Inc.		32,326		2,961,708
Target Corp.		10,571		1,873,287
US Foods Holding Corp (a)		42,431		2,290,001
Walmart, Inc.		48,186		2,899,352
				14,983,721
Energy — 11.4%
BP PLC Sponsored ADR		41,852		1,576,983
Canadian Natural Resources Ltd.		24,477		1,868,085
Cenovus Energy, Inc.		145,401		2,906,566
ConocoPhillips		20,070		2,554,510
Diamondback Energy, Inc.		9,172		1,817,615
Marathon Petroleum Corp.		15,082		3,039,023
Nov, Inc.		33,672		657,277
Peabody Energy Corp.		29,902		725,422
Phillips 66		15,699		2,564,275
Schlumberger NV		45,523		2,495,116
				20,204,872
Financials — 24.2%
American Express Co.		11,969		2,725,222
Aon PLC Class A		3,881		1,295,167
Arthur J Gallagher & Co.		4,942		1,235,698
Berkshire Hathaway, Inc. Class B (a)		15,260		6,417,135

MML Fundamental Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Charles Schwab Corp.		25,991	$	1,880,189
Chubb Ltd.		6,696		1,735,135
Corpay, Inc. (a)		6,066		1,871,604
Discover Financial Services		11,577		1,517,629
Fidelity National Information Services, Inc.		14,930		1,107,507
Global Payments, Inc.		16,493		2,204,454
Goldman Sachs Group, Inc.		4,612		1,926,386
Huntington Bancshares, Inc.		126,849		1,769,544
Intercontinental Exchange, Inc.		10,733		1,475,036
JP Morgan Chase & Co.		39,386		7,889,016
LPL Financial Holdings, Inc.		3,205		846,761
Morgan Stanley		40,357		3,800,015
Wells Fargo & Co.		56,165		3,255,323
				42,951,821
Health Care — 14.0%
Abbott Laboratories		21,237		2,413,798
Amgen, Inc.		7,637		2,171,352
Avantor, Inc. (a)		69,862		1,786,371
Bristol-Myers Squibb Co.		38,341		2,079,233
Cencora, Inc.		10,564		2,566,946
Centene Corp. (a)		25,520		2,002,810
Cigna Group		6,375		2,315,336
ICON PLC (a)		7,398		2,485,358
McKesson Corp.		3,980		2,136,663
Sanofi SA ADR		57,844		2,811,218
UnitedHealth Group, Inc.		4,163		2,059,436
				24,828,521
Industrials — 14.3%
Allegion PLC		8,802		1,185,718
Atkore, Inc.		46		8,757
Builders FirstSource, Inc. (a)		4,357		908,652
Deere & Co.		2,222		912,664
Dover Corp.		4,822		854,410
Eaton Corp. PLC		4,824		1,508,368
Fortive Corp.		20,843		1,792,915
General Dynamics Corp.		9,886		2,792,696
Howmet Aerospace, Inc.		25,170		1,722,383
Jacobs Solutions, Inc.		12,433		1,911,325
Leidos Holdings, Inc.		13,010		1,705,481
Masco Corp.		16,990		1,340,171
Norfolk Southern Corp.		7,758		1,977,282
United Rentals, Inc.		3,219		2,321,253
WESCO International, Inc.		9,779		1,674,947
Westinghouse Air Brake Technologies Corp.		11,229		1,635,841
WillScot Mobile Mini Holdings Corp. (a)		23,782		1,105,863
				25,358,726
Information Technology — 12.4%
Advanced Micro Devices, Inc. (a)		10,351		1,868,252
Applied Materials, Inc.		11,524		2,376,595
Cognizant Technology Solutions Corp. Class A		19,529		1,431,280
Dell Technologies, Inc. Class C		23,504		2,682,041
Flex Ltd. (a)		34,343		982,553
Keysight Technologies, Inc. (a)		3,028		473,519

MML Fundamental Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Lam Research Corp.		1,019	$	990,030
Microchip Technology, Inc.		24,311		2,180,940
Micron Technology, Inc.		24,899		2,935,343
Nice Ltd. Sponsored ADR (a) (b)		3,543		923,377
NXP Semiconductors NV		2,973		736,620
Oracle Corp.		29,030		3,646,458
QUALCOMM, Inc.		5,031		851,748
				22,078,756
Materials — 2.9%
CRH PLC		28,825		2,486,445
DuPont de Nemours, Inc.		9,823		753,129
Olin Corp.		11,850		696,780
Teck Resources Ltd. Class B		25,128		1,150,360
				5,086,714
Utilities — 1.1%
CenterPoint Energy, Inc.		26,436		753,162
FirstEnergy Corp.		32,741		1,264,457
				2,017,619
TOTAL COMMON STOCK (Cost $128,106,169)				176,185,084
TOTAL EQUITIES (Cost $128,106,169)				176,185,084
TOTAL LONG-TERM INVESTMENTS (Cost $128,106,169)				176,185,084
	Principal Amount
SHORT-TERM INVESTMENTS — 0.9%
Repurchase Agreement — 0.9%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (c)	$	1,535,497		1,535,497
TOTAL SHORT-TERM INVESTMENTS (Cost $1,535,497)				1,535,497
TOTAL INVESTMENTS — 100.1% (Cost $129,641,666) (d)				177,720,581
Other Assets/(Liabilities) — (0.1)%				(114,676)
NET ASSETS — 100.0%			$	177,605,905

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 March 31, 2024, was $913,994 or 0.51% of net assets. The Fund received $948,529 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 $1,535,770. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $1,566,287.

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

MML Global Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.1%
COMMON STOCK — 98.1%
Austria — 0.6%
Erste Group Bank AG		17,496	$	779,081
Canada — 3.6%
Canadian National Railway Co. (a)		16,268		2,142,658
Canadian Pacific Kansas City Ltd. (a)		30,261		2,668,113
				4,810,771
Denmark — 0.6%
Carlsberg AS Class B		5,383		737,541
France — 7.6%
Air Liquide SA		6,592		1,373,779
Capgemini SE		5,632		1,298,698
EssilorLuxottica SA		2,693		610,756
Hermes International SCA		264		676,800
Legrand SA		15,999		1,692,662
LVMH Moet Hennessy Louis Vuitton SE		3,218		2,910,479
Pernod Ricard SA		10,257		1,658,447
				10,221,621
Germany — 3.1%
Brenntag SE		7,182		604,992
Deutsche Boerse AG		3,512		718,591
Merck KGaA		12,154		2,145,038
MTU Aero Engines AG		2,434		617,608
				4,086,229
Israel — 1.3%
Check Point Software Technologies Ltd. (b)		10,199		1,672,738
Japan — 2.4%
Hoya Corp.		4,600		575,837
Kubota Corp.		80,400		1,280,255
Olympus Corp.		93,600		1,346,576
				3,202,668
Mexico — 0.3%
Grupo Financiero Banorte SAB de CV Class O		43,419		467,223
Netherlands — 2.2%
Akzo Nobel NV		13,178		982,901
Heineken NV		20,853		2,009,304
				2,992,205

MML Global Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Republic of Korea — 1.1%
Samsung Electronics Co. Ltd.		24,954	$	1,494,116
Spain — 2.8%
Aena SME SA (c)		6,544		1,288,209
Amadeus IT Group SA		17,506		1,122,696
Cellnex Telecom SA (c)		36,761		1,299,834
				3,710,739
Sweden — 1.0%
Essity AB Class B (a)		58,019		1,377,848
Switzerland — 4.6%
Cie Financiere Richemont SA Registered Class A		16,145		2,469,769
Julius Baer Group Ltd.		8,265		477,099
Sonova Holding AG Registered		2,366		684,802
UBS Group AG Registered		83,749		2,573,925
				6,205,595
United Kingdom — 7.3%
Burberry Group PLC		46,434		712,367
Compass Group PLC		26,987		790,910
Diageo PLC		68,802		2,540,900
Intertek Group PLC		14,050		885,317
London Stock Exchange Group PLC		9,045		1,083,399
Reckitt Benckiser Group PLC		20,790		1,182,722
Rolls-Royce Holdings PLC (b)		238,598		1,283,137
Whitbread PLC		13,512		565,987
WPP PLC		71,674		678,301
				9,723,040
United States — 59.6%
Abbott Laboratories		14,848		1,687,624
Accenture PLC Class A		5,036		1,745,528
Air Products & Chemicals, Inc.		4,452		1,078,586
Alphabet, Inc. Class A (b)		18,961		2,861,784
American Express Co.		8,899		2,026,213
Amphenol Corp. Class A		10,295		1,187,528
Aon PLC Class A		5,123		1,709,648
Aptiv PLC (b)		10,042		799,845
Becton Dickinson & Co.		7,505		1,857,112
Boston Scientific Corp. (b)		28,654		1,962,512
Carrier Global Corp.		7,042		409,351
Charles Schwab Corp.		40,232		2,910,383
Cognizant Technology Solutions Corp. Class A		12,401		908,869
Comcast Corp. Class A		66,438		2,880,087
The Cooper Cos., Inc.		12,205		1,238,319
eBay, Inc.		17,037		899,213
Equifax, Inc.		3,260		872,115
Experian PLC		32,422		1,415,416
Fidelity National Information Services, Inc.		16,317		1,210,395
Fiserv, Inc. (b)		9,271		1,481,691
Goldman Sachs Group, Inc.		5,990		2,501,963
Honeywell International, Inc.		13,115		2,691,854
International Flavors & Fragrances, Inc.		18,924		1,627,275
Linde PLC		6,189		2,873,676

MML Global Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Marriott International, Inc. Class A		4,024	$	1,015,295
Medtronic PLC		35,925		3,130,864
Microchip Technology, Inc.		8,412		754,641
Microsoft Corp.		5,357		2,253,797
Nestle SA Registered		21,553		2,288,507
Omnicom Group, Inc.		3,968		383,944
Oracle Corp.		20,981		2,635,423
Otis Worldwide Corp.		8,150		809,051
PPG Industries, Inc.		9,183		1,330,617
Roche Holding AG		9,610		2,453,210
Schneider Electric SE		15,883		3,591,659
Stryker Corp.		2,188		783,020
Thermo Fisher Scientific, Inc.		5,763		3,349,513
TransUnion		14,063		1,122,227
Union Pacific Corp.		6,639		1,632,729
United Parcel Service, Inc. Class B		6,544		972,635
Visa, Inc. Class A		13,937		3,889,538
Walt Disney Co.		14,763		1,806,401
Waters Corp. (b)		5,338		1,837,500
Willis Towers Watson PLC		10,362		2,849,550
				79,727,108
TOTAL COMMON STOCK (Cost $101,410,874)				131,208,523
TOTAL EQUITIES (Cost $101,410,874)				131,208,523
TOTAL LONG-TERM INVESTMENTS (Cost $101,410,874)				131,208,523
SHORT-TERM INVESTMENTS — 2.5%
Investment of Cash Collateral from Securities Loaned — 2.0%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		2,696,220		2,696,220
	Principal Amount
Repurchase Agreement — 0.5%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (e)	$	590,419		590,419
TOTAL SHORT-TERM INVESTMENTS (Cost $3,286,639)				3,286,639
TOTAL INVESTMENTS — 100.6% (Cost $104,697,513) (f)				134,495,162
Other Assets/(Liabilities) — (0.6)%				(743,730)
NET ASSETS — 100.0%			$	133,751,432

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Denotes all or a portion of security on loan. The total value of securities on loan as of March 31, 2024, was $6,113,320 or 4.57% of net assets. The Fund received $3,610,651 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).

(b) Non-income producing security.

(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 March 31, 2024, the aggregate market value of these securities amounted to $2,588,043 or 1.93% of net assets.

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

(e) Maturity value of $590,524. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $602,276.

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

MML Income & Growth Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.7%
COMMON STOCK — 98.7%
Communication Services — 4.4%
Alphabet, Inc. Class C (a)		9,256	$	1,409,319
Comcast Corp. Class A		78,269		3,392,961
Electronic Arts, Inc.		8,411		1,115,887
T-Mobile US, Inc.		5,707		931,497
				6,849,664
Consumer Discretionary — 4.7%
Aptiv PLC (a)		9,728		774,835
Aramark		34,788		1,131,306
Las Vegas Sands Corp.		24,437		1,263,393
Lithia Motors, Inc.		2,559		769,901
SharkNinja, Inc.		19,719		1,228,297
United Parks & Resorts, Inc. (a)		18,769		1,055,005
Wynn Resorts Ltd.		11,832		1,209,585
				7,432,322
Consumer Staples — 8.3%
Coca-Cola Europacific Partners PLC		39,047		2,731,338
Keurig Dr Pepper, Inc.		38,891		1,192,787
Kraft Heinz Co.		26,503		977,961
Molson Coors Beverage Co. Class B		17,466		1,174,588
Philip Morris International, Inc.		46,089		4,222,674
Procter & Gamble Co.		9,803		1,590,537
Tyson Foods, Inc. Class A		19,994		1,174,247
				13,064,132
Energy — 9.8%
Enbridge, Inc.		84,048		3,040,857
Halliburton Co.		29,083		1,146,452
Hess Corp.		23,810		3,634,358
Phillips 66		22,717		3,710,595
Pioneer Natural Resources Co.		4,337		1,138,462
Plains GP Holdings LP Class A		148,615		2,712,224
				15,382,948
Financials — 15.7%
Allstate Corp.		17,407		3,011,585
American Express Co.		3,861		879,111
American International Group, Inc.		15,171		1,185,917
Axis Capital Holdings Ltd.		12,403		806,443
Berkshire Hathaway, Inc. Class B (a)		2,680		1,126,994
Chubb Ltd.		12,761		3,306,758
Fidelity National Information Services, Inc.		58,104		4,310,155
JP Morgan Chase & Co.		12,384		2,480,515

MML Income & Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
M&T Bank Corp.		5,590	$	813,010
Northern Trust Corp.		13,952		1,240,612
US Bancorp		14,652		654,944
Wells Fargo & Co.		61,271		3,551,267
Willis Towers Watson PLC		4,724		1,299,100
				24,666,411
Health Care — 16.7%
Avantor, Inc. (a)		49,940		1,276,966
Cigna Group		6,716		2,439,184
CVS Health Corp.		39,305		3,134,967
Elevance Health, Inc.		2,011		1,042,784
Humana, Inc.		7,806		2,706,496
Johnson & Johnson		5,532		875,107
LivaNova PLC (a)		10,372		580,209
Medtronic PLC		39,598		3,450,966
Merck & Co., Inc.		36,144		4,769,201
Sanofi SA ADR		23,680		1,150,848
Smith & Nephew PLC Sponsored ADR (b)		89,403		2,267,260
UnitedHealth Group, Inc.		4,996		2,471,521
				26,165,509
Industrials — 13.1%
AECOM		11,610		1,138,709
AerCap Holdings NV (a)		17,103		1,486,422
BWX Technologies, Inc.		14,805		1,519,289
CACI International, Inc. Class A (a)		3,247		1,230,061
General Dynamics Corp.		8,844		2,498,341
Jacobs Solutions, Inc.		7,146		1,098,555
JB Hunt Transport Services, Inc.		4,456		887,858
Johnson Controls International PLC		6,100		398,452
MDU Resources Group, Inc.		44,517		1,121,828
RTX Corp.		20,898		2,038,182
Stanley Black & Decker, Inc.		18,833		1,844,316
U-Haul Holding Co.		13,774		918,450
Vertiv Holdings Co. Class A		45,224		3,693,444
Vestis Corp.		33,091		637,664
				20,511,571
Information Technology — 7.3%
Broadcom, Inc.		1,828		2,422,850
Ciena Corp. (a)		10,886		538,313
Cognizant Technology Solutions Corp. Class A		15,480		1,134,529
Microchip Technology, Inc.		11,116		997,216
Oracle Corp.		22,930		2,880,237
QUALCOMM, Inc.		9,271		1,569,580
Skyworks Solutions, Inc.		16,785		1,818,151
				11,360,876
Materials — 8.6%
Air Products & Chemicals, Inc.		15,207		3,684,200
Axalta Coating Systems Ltd. (a)		40,184		1,381,928
CRH PLC		21,685		1,870,548
DuPont de Nemours, Inc.		31,519		2,416,562
Element Solutions, Inc.		46,182		1,153,626
International Flavors & Fragrances, Inc.		18,815		1,617,902

MML Income & Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Knife River Corp. (a)		17,186	$	1,393,441
				13,518,207
Real Estate — 5.5%
COPT Defense Properties		31,641		764,763
CubeSmart		17,808		805,278
Howard Hughes Holdings, Inc. (a)		6,765		491,274
Mid-America Apartment Communities, Inc.		14,881		1,958,042
Public Storage		10,989		3,187,469
VICI Properties, Inc.		46,112		1,373,677
				8,580,503
Utilities — 4.6%
CenterPoint Energy, Inc.		32,144		915,783
Entergy Corp.		34,237		3,618,166
Pinnacle West Capital Corp.		35,647		2,663,899
				7,197,848
TOTAL COMMON STOCK (Cost $119,878,483)				154,729,991
TOTAL EQUITIES (Cost $119,878,483)				154,729,991
TOTAL LONG-TERM INVESTMENTS (Cost $119,878,483)				154,729,991
SHORT-TERM INVESTMENTS — 2.0%
Investment of Cash Collateral from Securities Loaned — 1.1%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		1,625,546		1,625,546
	Principal Amount
Repurchase Agreement — 0.9%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (d)	$	1,461,797		1,461,797
TOTAL SHORT-TERM INVESTMENTS (Cost $3,087,343)				3,087,343
TOTAL INVESTMENTS — 100.7% (Cost $122,965,826) (e)				157,817,334
Other Assets/(Liabilities) — (0.7)%				(1,088,706)
NET ASSETS — 100.0%			$	156,728,628

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 March 31, 2024, was $1,585,533 or 1.01% of net assets. (Note 2).

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

(d) Maturity value of $1,462,056. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $1,491,144.

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

MML International Equity Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.6%
COMMON STOCK — 98.0%
Australia — 1.2%
Brambles Ltd.		20,000	$	210,882
Glencore PLC		274,544		1,510,390
Rio Tinto PLC		20,442		1,297,159
				3,018,431
Belgium — 1.2%
Anheuser-Busch InBev SA		16,500		1,003,670
KBC Group NV		14,565		1,094,361
Liberty Global Ltd. Class A (a)		41,300		698,796
				2,796,827
Canada — 3.2%
Canadian National Railway Co. (b)		17,684		2,329,160
Intact Financial Corp.		7,267		1,180,488
Open Text Corp. (b)		32,200		1,249,442
Suncor Energy, Inc.		40,435		1,492,264
Toronto-Dominion Bank		26,891		1,622,930
				7,874,284
China — 2.9%
Alibaba Group Holding Ltd.		153,540		1,385,670
NetEase, Inc.		58,400		1,213,661
Prosus NV		66,416		2,081,224
Tencent Holdings Ltd.		43,900		1,713,184
Yum China Holdings, Inc.		16,911		672,889
				7,066,628
Denmark — 2.9%
Carlsberg AS Class B		13,816		1,892,972
DSV AS		6,690		1,087,027
Novo Nordisk AS Class B		33,050		4,233,570
				7,213,569
France — 15.9%
Accor SA		28,400		1,325,732
Air Liquide SA		24,903		5,189,809
BNP Paribas SA		44,976		3,200,862
Capgemini SE		20,347		4,691,870
Cie de Saint-Gobain SA		27,691		2,147,321
Cie Generale des Etablissements Michelin SCA Class A		41,476		1,590,192
Danone SA		16,000		1,033,829
Dassault Systemes SE		20,636		912,755
Edenred SE		35,588		1,897,260

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Engie SA		130,181	$	2,187,661
EssilorLuxottica SA		12,530		2,841,730
Kering SA		5,325		2,104,782
Legrand SA		14,852		1,571,311
LVMH Moet Hennessy Louis Vuitton SE		4,527		4,094,387
Pernod Ricard SA		12,413		2,007,049
Publicis Groupe SA		6,816		742,801
Valeo SE		64,184		801,885
Worldline SA (a) (c)		63,200		782,459
				39,123,695
Germany — 14.5%
adidas AG		5,065		1,131,382
Allianz SE Registered		6,210		1,861,044
Bayer AG Registered		86,994		2,667,936
Bayerische Motoren Werke AG		15,600		1,799,947
Beiersdorf AG		21,831		3,178,488
Brenntag SE		11,190		942,615
Continental AG		25,135		1,814,233
Daimler Truck Holding AG		33,390		1,691,431
Deutsche Boerse AG		14,071		2,879,070
Fresenius Medical Care AG		54,600		2,099,865
Fresenius SE & Co. KGaA		62,000		1,672,109
Henkel AG & Co. KGaA		11,500		828,259
Mercedes Benz Group AG		29,858		2,378,287
Merck KGaA		16,020		2,827,341
MTU Aero Engines AG		3,930		997,206
SAP SE		27,130		5,282,025
Siemens AG Registered		6,435		1,228,474
thyssenkrupp AG		83,574		448,479
				35,728,191
Hong Kong — 2.3%
AIA Group Ltd.		326,600		2,191,809
Prudential PLC		356,389		3,352,382
				5,544,191
India — 1.0%
Axis Bank Ltd.		41,882		526,589
HDFC Bank Ltd. ADR		31,855		1,782,924
				2,309,513
Indonesia — 0.1%
Bank Mandiri Persero Tbk. PT		382,700		175,203
Ireland — 0.5%
AIB Group PLC		207,904		1,054,452
Smurfit Kappa Group PLC		4,100		187,033
				1,241,485
Israel — 0.6%
Check Point Software Technologies Ltd. (a)		9,476		1,554,159
Italy — 4.2%
Eni SpA		119,774		1,899,021

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Intesa Sanpaolo SpA		1,288,329	$	4,674,279
Ryanair Holdings PLC Sponsored ADR		26,204		3,815,040
				10,388,340
Japan — 11.5%
Daikin Industries Ltd.		13,000		1,778,269
Denso Corp.		125,700		2,405,159
Fujitsu Ltd.		60,000		960,751
Hitachi Ltd.		50,300		4,594,388
Hoya Corp.		10,800		1,351,965
Komatsu Ltd.		24,200		716,618
Kose Corp.		13,300		720,307
Kubota Corp.		42,100		670,382
Kyocera Corp.		124,200		1,658,892
Mitsubishi Electric Corp.		103,400		1,733,140
Olympus Corp.		109,900		1,581,076
Recruit Holdings Co. Ltd.		13,800		607,919
Seven & i Holdings Co. Ltd.		118,200		1,720,492
Shin-Etsu Chemical Co. Ltd.		30,800		1,351,378
SMC Corp.		3,300		1,862,066
Sony Group Corp.		24,100		2,065,431
Terumo Corp.		89,000		1,631,315
ZOZO, Inc. (b)		39,500		980,256
				28,389,804
Luxembourg — 0.5%
Eurofins Scientific SE		19,000		1,209,971
Netherlands — 2.0%
Akzo Nobel NV		11,435		852,896
EXOR NV		11,450		1,272,515
ING Groep NV Series N		171,436		2,823,397
				4,948,808
Portugal — 0.5%
Galp Energia SGPS SA		79,396		1,314,240
Republic of Korea — 1.2%
NAVER Corp.		9,395		1,306,215
Samsung Electronics Co. Ltd. GDR (c)		1,146		1,703,054
				3,009,269
Singapore — 0.8%
DBS Group Holdings Ltd.		74,200		1,984,641
Spain — 1.1%
Amadeus IT Group SA		43,124		2,765,632
Sweden — 1.0%
Sandvik AB		30,100		667,861
SKF AB Class B (b)		51,100		1,041,573
Volvo AB Class B (b)		30,670		830,635
				2,540,069
Switzerland — 7.5%
Cie Financiere Richemont SA Registered Class A		25,218		3,857,704

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Julius Baer Group Ltd.		17,568	$	1,014,116
Novartis AG Registered		39,247		3,800,850
Schindler Holding AG		1,980		498,521
Sika AG Registered		4,400		1,310,126
Sonova Holding AG Registered		3,740		1,082,486
Swatch Group AG (b)		4,055		940,933
UBS Group AG Registered		104,626		3,215,555
Zurich Insurance Group AG		4,941		2,664,092
				18,384,383
Taiwan — 1.1%
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR		19,694		2,679,369
United Kingdom — 10.1%
Ashtead Group PLC		15,300		1,087,541
Bunzl PLC		4,300		165,587
Compass Group PLC		145,410		4,261,541
Diageo PLC		53,240		1,966,186
Informa PLC		46,282		485,232
Lloyds Banking Group PLC		4,403,784		2,882,701
London Stock Exchange Group PLC		17,810		2,133,259
Reckitt Benckiser Group PLC		18,080		1,028,553
RELX PLC		70,277		3,036,602
Rolls-Royce Holdings PLC (a)		469,586		2,525,349
Schroders PLC		327,417		1,559,834
Smith & Nephew PLC		27,200		343,955
Smiths Group PLC		22,100		458,503
Tesco PLC		366,829		1,372,712
WPP PLC		155,492		1,471,529
				24,779,084
United States — 10.2%
CNH Industrial NV		218,653		2,833,743
Experian PLC		69,784		3,046,493
Holcim AG		9,649		878,143
Linde PLC		5,838		2,710,700
Nestle SA Registered		41,111		4,365,183
Qiagen NV		32,934		1,408,345
Roche Holding AG		17,599		4,492,617
Schneider Electric SE		24,046		5,437,576
				25,172,800
TOTAL COMMON STOCK (Cost $224,386,502)				241,212,586
PREFERRED STOCK — 0.6%
Republic of Korea — 0.6%
Samsung Electronics Co. Ltd. 2.312%		28,500		1,423,071

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
TOTAL PREFERRED STOCK (Cost $1,435,803)			$	1,423,071
TOTAL EQUITIES (Cost $225,822,305)				242,635,657
TOTAL LONG-TERM INVESTMENTS (Cost $225,822,305)				242,635,657
SHORT-TERM INVESTMENTS — 2.0%
Investment of Cash Collateral from Securities Loaned — 1.2%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		2,939,988		2,939,988
	Principal Amount
Repurchase Agreement — 0.8%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (e)	$	1,952,312		1,952,312
TOTAL SHORT-TERM INVESTMENTS (Cost $4,892,300)				4,892,300
TOTAL INVESTMENTS — 100.6% (Cost $230,714,605) (f)				247,527,957
Other Assets/(Liabilities) — (0.6)%				(1,364,187)
NET ASSETS — 100.0%			$	246,163,770

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) Denotes all or a portion of security on loan. The total value of securities on loan as of March 31, 2024, was $5,067,503 or 2.06% of net assets. The Fund received $2,431,394 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 March 31, 2024, the aggregate market value of these securities amounted to $2,485,513 or 1.01% of net assets.

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

(e) Maturity value of $1,952,659. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $1,991,549.

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

MML Large Cap Growth Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 95.8%
COMMON STOCK — 95.8%
Communication Services — 21.9%
Alphabet, Inc. Class A (a)		54,673	$	8,251,796
Alphabet, Inc. Class C (a)		26,073		3,969,875
Meta Platforms, Inc. Class A		32,248		15,658,984
Netflix, Inc. (a)		16,365		9,938,955
Walt Disney Co.		58,562		7,165,646
				44,985,256
Consumer Discretionary — 14.0%
Alibaba Group Holding Ltd. Sponsored ADR		19,087		1,381,135
Amazon.com, Inc. (a)		65,962		11,898,226
Starbucks Corp.		32,531		2,973,008
Tesla, Inc. (a)		54,541		9,587,763
Yum China Holdings, Inc.		18,661		742,521
Yum! Brands, Inc.		15,948		2,211,190
				28,793,843
Consumer Staples — 2.8%
Monster Beverage Corp. (a)		96,075		5,695,326
Financials — 9.9%
Block, Inc. (a)		29,296		2,477,856
FactSet Research Systems, Inc.		6,072		2,759,056
PayPal Holdings, Inc. (a)		26,565		1,779,589
SEI Investments Co.		34,588		2,486,877
Visa, Inc. Class A		38,624		10,779,186
				20,282,564
Health Care — 12.5%
Illumina, Inc. (a)		17,124		2,351,468
Intuitive Surgical, Inc. (a)		7,035		2,807,598
Novartis AG Sponsored ADR		23,046		2,229,240
Novo Nordisk AS Sponsored ADR		34,644		4,448,290
Regeneron Pharmaceuticals, Inc. (a)		4,547		4,376,442
Roche Holding AG Sponsored ADR (b)		52,426		1,673,438
Thermo Fisher Scientific, Inc.		4,754		2,763,072
Vertex Pharmaceuticals, Inc. (a)		12,225		5,110,172
				25,759,720
Industrials — 6.7%
Boeing Co. (a)		51,357		9,911,387
Deere & Co.		2,842		1,167,323
Expeditors International of Washington, Inc.		23,045		2,801,581
				13,880,291

MML Large Cap Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Information Technology — 28.0%
Autodesk, Inc. (a)		23,244	$	6,053,202
Microsoft Corp.		24,803		10,435,118
NVIDIA Corp.		17,266		15,600,867
Oracle Corp.		69,873		8,776,748
QUALCOMM, Inc.		22,308		3,776,744
Salesforce, Inc.		23,333		7,027,433
Shopify, Inc. Class A (a)		48,571		3,748,224
Workday, Inc. Class A (a)		8,098		2,208,730
				57,627,066
TOTAL COMMON STOCK (Cost $137,145,690)				197,024,066
TOTAL EQUITIES (Cost $137,145,690)				197,024,066
TOTAL LONG-TERM INVESTMENTS (Cost $137,145,690)				197,024,066
SHORT-TERM INVESTMENTS — 4.9%
Investment of Cash Collateral from Securities Loaned — 0.8%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		1,615,001		1,615,001
	Principal Amount
Repurchase Agreement — 4.1%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (d)	$	8,436,474		8,436,474
TOTAL SHORT-TERM INVESTMENTS (Cost $10,051,475)				10,051,475
TOTAL INVESTMENTS — 100.7% (Cost $147,197,165) (e)				207,075,541
Other Assets/(Liabilities) — (0.7)%				(1,367,253)
NET ASSETS — 100.0%			$	205,708,288

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 March 31, 2024, was $1,656,680 or 0.81% of net assets. The Fund received $88,020 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 $8,437,974. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $8,605,274.

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

MML Managed Volatility Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.2%
COMMON STOCK — 99.2%
Communication Services — 8.9%
Alphabet, Inc. Class A (a) (b)		13,304	$	2,007,973
Alphabet, Inc. Class C (a) (b)		11,569		1,761,496
AT&T, Inc. (b)		16,593		292,037
Charter Communications, Inc. Class A (a) (b)		231		67,135
Comcast Corp. Class A (b)		9,035		391,667
Electronic Arts, Inc. (b)		577		76,551
Fox Corp. Class A (b)		381		11,914
Fox Corp. Class B (b)		505		14,453
Interpublic Group of Cos., Inc. (b)		850		27,735
Live Nation Entertainment, Inc. (a) (b)		319		33,741
Match Group, Inc. (a) (b)		612		22,203
Meta Platforms, Inc. Class A (b)		5,055		2,454,607
Netflix, Inc. (a) (b)		993		603,079
News Corp. Class A (b)		573		15,001
News Corp. Class B (b)		511		13,828
Omnicom Group, Inc. (b)		474		45,864
Paramount Global Class B (b)		1,322		15,560
T-Mobile US, Inc. (b)		1,225		199,944
Take-Two Interactive Software, Inc. (a) (b)		371		55,090
Verizon Communications, Inc. (b)		9,553		400,844
Walt Disney Co. (b)		4,200		513,912
Warner Bros Discovery, Inc. (a) (b)		5,164		45,082
				9,069,716
Consumer Discretionary — 10.3%
Airbnb, Inc. Class A (a) (b)		1,013		167,104
Amazon.com, Inc. (a) (b)		21,004		3,788,702
Aptiv PLC (a) (b)		642		51,135
AutoZone, Inc. (a) (b)		40		126,066
Bath & Body Works, Inc. (b)		510		25,510
Best Buy Co., Inc. (b)		460		37,734
Booking Holdings, Inc. (b)		80		290,230
BorgWarner, Inc. (b)		509		17,683
Caesars Entertainment, Inc. (a) (b)		454		19,858
CarMax, Inc. (a) (b)		349		30,401
Carnival Corp. (a) (b)		2,247		36,716
Chipotle Mexican Grill, Inc. (a) (b)		62		180,220
Darden Restaurants, Inc. (b)		287		47,972
Deckers Outdoor Corp. (a) (b)		60		56,476
Domino's Pizza, Inc. (b)		80		39,750
DR Horton, Inc. (b)		694		114,198
eBay, Inc. (b)		1,215		64,128
Etsy, Inc. (a) (b)		264		18,142
Expedia Group, Inc. (a) (b)		306		42,151
Ford Motor Co. (b)		8,846		117,475
Garmin Ltd. (b)		360		53,593

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
General Motors Co. (b)		2,690	$	121,991
Genuine Parts Co. (b)		332		51,437
Hasbro, Inc. (b)		336		18,991
Hilton Worldwide Holdings, Inc. (b)		592		126,280
Home Depot, Inc. (b)		2,284		876,142
Las Vegas Sands Corp. (b)		886		45,806
Lennar Corp. Class A (b)		544		93,557
LKQ Corp. (b)		492		26,278
Lowe's Cos., Inc. (b)		1,315		334,970
Lululemon Athletica, Inc. (a) (b)		266		103,913
Marriott International, Inc. Class A (b)		587		148,106
McDonald's Corp. (b)		1,663		468,883
MGM Resorts International (a) (b)		613		28,940
Mohawk Industries, Inc. (a) (b)		120		15,707
NIKE, Inc. Class B (b)		2,783		261,546
Norwegian Cruise Line Holdings Ltd. (a) (b)		976		20,428
NVR, Inc. (a) (b)		7		56,700
O'Reilly Automotive, Inc. (a) (b)		134		151,270
Pool Corp. (b)		81		32,683
PulteGroup, Inc. (b)		498		60,069
Ralph Lauren Corp. (b)		85		15,960
Ross Stores, Inc. (b)		781		114,620
Royal Caribbean Cruises Ltd. (a) (b)		564		78,402
Starbucks Corp. (b)		2,583		236,060
Tapestry, Inc. (b)		507		24,072
Tesla, Inc. (a) (b)		6,360		1,118,024
TJX Cos., Inc. (b)		2,661		269,879
Tractor Supply Co. (b)		249		65,168
Ulta Beauty, Inc. (a) (b)		113		59,085
VF Corp. (b)		774		11,873
Wynn Resorts Ltd. (b)		211		21,571
Yum! Brands, Inc. (b)		634		87,904
				10,471,559
Consumer Staples — 5.9%
Altria Group, Inc. (b)		4,072		177,621
Archer-Daniels-Midland Co. (b)		1,230		77,256
Brown-Forman Corp. Class B (b)		476		24,571
Bunge Global SA (b)		321		32,909
Campbell Soup Co. (b)		536		23,825
Church & Dwight Co., Inc. (b)		528		55,076
Clorox Co. (b)		276		42,258
Coca-Cola Co. (b)		8,904		544,747
Colgate-Palmolive Co. (b)		1,968		177,218
Conagra Brands, Inc. (b)		1,222		36,220
Constellation Brands, Inc. Class A (b)		356		96,747
Costco Wholesale Corp. (b)		1,017		745,085
Dollar General Corp. (b)		503		78,498
Dollar Tree, Inc. (a) (b)		477		63,513
Estee Lauder Cos., Inc. Class A (b)		530		81,700
General Mills, Inc. (b)		1,364		95,439
Hershey Co. (b)		362		70,409
Hormel Foods Corp. (b)		709		24,737
J. M. Smucker Co. (b)		267		33,607
Kellanova (b)		532		30,478
Kenvue, Inc. (b)		3,909		83,887
Keurig Dr Pepper, Inc. (b)		2,411		73,945
Kimberly-Clark Corp. (b)		765		98,953

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Kraft Heinz Co. (b)		1,700	$	62,730
Kroger Co. (b)		1,593		91,008
Lamb Weston Holdings, Inc. (b)		338		36,007
McCormick & Co., Inc. (b)		556		42,706
Molson Coors Beverage Co. Class B (b)		382		25,690
Mondelez International, Inc. Class A (b)		3,038		212,660
Monster Beverage Corp. (a) (b)		1,651		97,871
PepsiCo, Inc. (b)		3,191		558,457
Philip Morris International, Inc. (b)		3,599		329,740
Procter & Gamble Co. (b)		5,399		875,988
Sysco Corp. (b)		1,156		93,844
Target Corp. (b)		1,052		186,425
Tyson Foods, Inc. Class A (b)		619		36,354
Walgreens Boots Alliance, Inc. (b)		1,705		36,982
Walmart, Inc. (b)		9,817		590,689
				6,045,850
Energy — 3.9%
APA Corp. (b)		712		24,479
Baker Hughes Co. (b)		2,352		78,792
Chevron Corp. (b)		3,967		625,755
ConocoPhillips (b)		2,762		351,547
Coterra Energy, Inc. (b)		1,668		46,504
Devon Energy Corp. (b)		1,374		68,947
Diamondback Energy, Inc. (b)		400		79,268
EOG Resources, Inc. (b)		1,303		166,575
EQT Corp. (b)		898		33,289
Exxon Mobil Corp. (b)		9,094		1,057,087
Halliburton Co. (b)		2,082		82,072
Hess Corp. (b)		607		92,652
Kinder Morgan, Inc. (b)		4,695		86,106
Marathon Oil Corp. (b)		1,426		40,413
Marathon Petroleum Corp. (b)		831		167,446
Occidental Petroleum Corp. (b)		1,570		102,034
ONEOK, Inc. (b)		1,362		109,192
Phillips 66 (b)		973		158,930
Pioneer Natural Resources Co. (b)		528		138,600
Schlumberger NV (b)		3,311		181,476
Targa Resources Corp. (b)		556		62,266
Valero Energy Corp. (b)		795		135,699
Williams Cos., Inc. (b)		2,814		109,662
				3,998,791
Financials — 13.0%
Aflac, Inc. (b)		1,215		104,320
Allstate Corp. (b)		623		107,785
American Express Co. (b)		1,297		295,314
American International Group, Inc. (b)		1,616		126,323
Ameriprise Financial, Inc. (b)		229		100,403
Aon PLC Class A (b)		444		148,172
Arch Capital Group Ltd. (a) (b)		882		81,532
Arthur J Gallagher & Co. (b)		496		124,020
Assurant, Inc. (b)		134		25,224
Bank of America Corp. (b)		15,784		598,529
Bank of New York Mellon Corp. (b)		1,750		100,835
Berkshire Hathaway, Inc. Class B (a) (b)		4,170		1,753,568
BlackRock, Inc. (b)		325		270,953

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Blackstone, Inc. (b)		1,678	$	220,439
Brown & Brown, Inc. (b)		588		51,474
Capital One Financial Corp. (b)		899		133,852
Cboe Global Markets, Inc. (b)		238		43,728
Charles Schwab Corp. (b)		3,396		245,667
Chubb Ltd. (b)		948		245,655
Cincinnati Financial Corp. (b)		347		43,087
Citigroup, Inc. (b)		4,350		275,094
Citizens Financial Group, Inc. (b)		917		33,278
CME Group, Inc. (b)		812		174,816
Comerica, Inc. (b)		326		17,927
Corpay, Inc. (a) (b)		174		53,686
Discover Financial Services (b)		575		75,377
Everest Group Ltd. (b)		98		38,955
FactSet Research Systems, Inc. (b)		78		35,442
Fidelity National Information Services, Inc. (b)		1,369		101,552
Fifth Third Bancorp (b)		1,519		56,522
Fiserv, Inc. (a) (b)		1,355		216,556
Franklin Resources, Inc. (b)		675		18,974
Global Payments, Inc. (b)		630		84,206
Globe Life, Inc. (b)		227		26,416
Goldman Sachs Group, Inc. (b)		757		316,191
Hartford Financial Services Group, Inc. (b)		701		72,238
Huntington Bancshares, Inc. (b)		2,812		39,227
Intercontinental Exchange, Inc. (b)		1,338		183,881
Invesco Ltd. (b)		1,194		19,809
Jack Henry & Associates, Inc. (b)		162		28,144
JP Morgan Chase & Co. (b)		6,648		1,331,594
KeyCorp. (b)		2,382		37,659
Loews Corp. (b)		382		29,907
M&T Bank Corp. (b)		380		55,267
MarketAxess Holdings, Inc. (b)		91		19,952
Marsh & McLennan Cos., Inc. (b)		1,087		223,900
Mastercard, Inc. Class A (b)		1,893		911,612
MetLife, Inc. (b)		1,329		98,492
Moody's Corp. (b)		365		143,456
Morgan Stanley (b)		2,935		276,360
MSCI, Inc. (b)		177		99,200
Nasdaq, Inc. (b)		741		46,757
Northern Trust Corp. (b)		473		42,059
PayPal Holdings, Inc. (a) (b)		2,503		167,676
PNC Financial Services Group, Inc. (b)		927		149,803
Principal Financial Group, Inc. (b)		467		40,307
Progressive Corp. (b)		1,370		283,343
Prudential Financial, Inc. (b)		821		96,385
Raymond James Financial, Inc. (b)		456		58,560
Regions Financial Corp. (b)		2,133		44,878
S&P Global, Inc. (b)		731		311,004
State Street Corp. (b)		718		55,516
Synchrony Financial (b)		952		41,050
T. Rowe Price Group, Inc. (b)		531		64,740
Travelers Cos., Inc. (b)		535		123,125
Truist Financial Corp. (b)		3,060		119,279
US Bancorp (b)		3,632		162,350
Visa, Inc. Class A (b)		3,616		1,009,153
W. R. Berkley Corp. (b)		471		41,655
Wells Fargo & Co. (b)		8,253		478,344

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Willis Towers Watson PLC (b)		239	$	65,725
				13,318,279
Health Care — 12.3%
Abbott Laboratories (b)		3,979		452,253
AbbVie, Inc. (b)		4,048		737,141
Agilent Technologies, Inc. (b)		688		100,111
Align Technology, Inc. (a) (b)		160		52,467
Amgen, Inc. (b)		1,223		347,723
Baxter International, Inc. (b)		1,174		50,177
Becton Dickinson & Co. (b)		687		169,998
Bio-Rad Laboratories, Inc. Class A (a) (b)		43		14,872
Bio-Techne Corp. (b)		363		25,551
Biogen, Inc. (a) (b)		344		74,177
Boston Scientific Corp. (a) (b)		3,403		233,071
Bristol-Myers Squibb Co. (b)		4,749		257,538
Cardinal Health, Inc. (b)		579		64,790
Catalent, Inc. (a) (b)		417		23,540
Cencora, Inc. (b)		389		94,523
Centene Corp. (a) (b)		1,236		97,001
Charles River Laboratories International, Inc. (a) (b)		116		31,430
Cigna Group (b)		682		247,696
The Cooper Cos., Inc. (b)		448		45,454
CVS Health Corp. (b)		2,855		227,715
Danaher Corp. (b)		1,498		374,080
DaVita, Inc. (a) (b)		138		19,051
DENTSPLY SIRONA, Inc. (b)		447		14,836
Dexcom, Inc. (a) (b)		880		122,056
Edwards Lifesciences Corp. (a) (b)		1,378		131,682
Elevance Health, Inc. (b)		547		283,641
Eli Lilly & Co. (b)		1,831		1,424,445
GE HealthCare Technologies, Inc. (a) (b)		937		85,183
Gilead Sciences, Inc. (b)		2,911		213,231
HCA Healthcare, Inc. (b)		460		153,424
Henry Schein, Inc. (a) (b)		327		24,695
Hologic, Inc. (a) (b)		548		42,722
Humana, Inc. (b)		286		99,162
IDEXX Laboratories, Inc. (a) (b)		193		104,206
Illumina, Inc. (a) (b)		355		48,749
Incyte Corp. (a) (b)		435		24,782
Insulet Corp. (a) (b)		169		28,967
Intuitive Surgical, Inc. (a) (b)		820		327,254
IQVIA Holdings, Inc. (a) (b)		422		106,720
Johnson & Johnson (b)		5,516		872,576
Laboratory Corp. of America Holdings (b)		182		39,760
McKesson Corp. (b)		294		157,834
Medtronic PLC (b)		3,032		264,239
Merck & Co., Inc. (b)		5,804		765,838
Mettler-Toledo International, Inc. (a) (b)		52		69,227
Moderna, Inc. (a) (b)		782		83,330
Molina Healthcare, Inc. (a) (b)		126		51,765
Pfizer, Inc. (b)		12,901		358,003
Quest Diagnostics, Inc. (b)		269		35,807
Regeneron Pharmaceuticals, Inc. (a) (b)		241		231,960
ResMed, Inc. (b)		329		65,152
Revvity, Inc. (b)		273		28,665
STERIS PLC (b)		227		51,034
Stryker Corp. (b)		774		276,991

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Teleflex, Inc. (b)		106	$	23,974
Thermo Fisher Scientific, Inc. (b)		882		512,627
UnitedHealth Group, Inc. (b)		2,120		1,048,764
Universal Health Services, Inc. Class B (b)		142		25,909
Vertex Pharmaceuticals, Inc. (a) (b)		588		245,790
Viatris, Inc. (b)		2,804		33,480
Waters Corp. (a) (b)		143		49,225
West Pharmaceutical Services, Inc. (b)		175		69,249
Zimmer Biomet Holdings, Inc. (b)		478		63,086
Zoetis, Inc. (b)		1,072		181,393
				12,581,792
Industrials — 8.7%
3M Co. (b)		1,298		137,679
A.O. Smith Corp. (b)		305		27,285
Allegion PLC (b)		194		26,134
American Airlines Group, Inc. (a) (b)		1,301		19,970
AMETEK, Inc. (b)		496		90,718
Automatic Data Processing, Inc. (b)		966		241,249
Axon Enterprise, Inc. (a) (b)		163		50,999
Boeing Co. (a) (b)		1,312		253,203
Broadridge Financial Solutions, Inc. (b)		262		53,673
Builders FirstSource, Inc. (a) (b)		292		60,897
C.H. Robinson Worldwide, Inc. (b)		274		20,862
Carrier Global Corp. (b)		1,860		108,122
Caterpillar, Inc. (b)		1,163		426,158
Cintas Corp. (b)		203		139,467
Copart, Inc. (a) (b)		2,024		117,230
CSX Corp. (b)		4,554		168,817
Cummins, Inc. (b)		324		95,467
Dayforce, Inc. (a) (b)		388		25,689
Deere & Co. (b)		608		249,730
Delta Air Lines, Inc. (b)		1,521		72,810
Dover Corp. (b)		317		56,169
Eaton Corp. PLC (b)		928		290,167
Emerson Electric Co. (b)		1,328		150,622
Equifax, Inc. (b)		272		72,765
Expeditors International of Washington, Inc. (b)		318		38,659
Fastenal Co. (b)		1,361		104,988
FedEx Corp. (b)		521		150,955
Fortive Corp. (b)		859		73,891
Generac Holdings, Inc. (a) (b)		149		18,795
General Dynamics Corp. (b)		521		147,177
General Electric Co. (b)		2,483		435,841
Honeywell International, Inc. (b)		1,483		304,386
Howmet Aerospace, Inc. (b)		865		59,192
Hubbell, Inc. (b)		130		53,957
Huntington Ingalls Industries, Inc. (b)		90		26,232
IDEX Corp. (b)		161		39,287
Illinois Tool Works, Inc. (b)		636		170,658
Ingersoll Rand, Inc. (b)		927		88,019
Jacobs Solutions, Inc. (b)		280		43,044
JB Hunt Transport Services, Inc. (b)		169		33,673
Johnson Controls International PLC (b)		1,564		102,160
L3Harris Technologies, Inc. (b)		419		89,289
Leidos Holdings, Inc. (b)		352		46,144
Lockheed Martin Corp. (b)		489		222,431
Masco Corp. (b)		543		42,832

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Nordson Corp. (b)		120	$	32,945
Norfolk Southern Corp. (b)		524		133,552
Northrop Grumman Corp. (b)		332		158,915
Old Dominion Freight Line, Inc. (b)		426		93,426
Otis Worldwide Corp. (b)		877		87,060
PACCAR, Inc. (b)		1,225		151,765
Parker-Hannifin Corp. (b)		299		166,181
Paychex, Inc. (b)		732		89,890
Paycom Software, Inc. (b)		100		19,901
Pentair PLC (b)		337		28,793
Quanta Services, Inc. (b)		329		85,474
Republic Services, Inc. (b)		467		89,402
Robert Half, Inc. (b)		262		20,771
Rockwell Automation, Inc. (b)		263		76,620
Rollins, Inc. (b)		651		30,122
RTX Corp. (b)		3,026		295,126
Snap-on, Inc. (b)		105		31,103
Southwest Airlines Co. (b)		1,388		40,516
Stanley Black & Decker, Inc. (b)		359		35,157
Textron, Inc. (b)		478		45,855
Trane Technologies PLC (b)		530		159,106
TransDigm Group, Inc. (b)		128		157,645
Uber Technologies, Inc. (a) (b)		4,719		363,316
Union Pacific Corp. (b)		1,395		343,072
United Airlines Holdings, Inc. (a) (b)		736		35,240
United Parcel Service, Inc. Class B (b)		1,680		249,698
United Rentals, Inc. (b)		150		108,167
Veralto Corp. (b)		530		46,990
Verisk Analytics, Inc. (b)		334		78,734
W.W. Grainger, Inc. (b)		102		103,765
Waste Management, Inc. (b)		850		181,177
Westinghouse Air Brake Technologies Corp. (b)		381		55,504
Xylem, Inc. (b)		590		76,252
				8,918,732
Information Technology — 29.3%
Accenture PLC Class A (b)		1,438		498,425
Adobe, Inc. (a) (b)		1,037		523,270
Advanced Micro Devices, Inc. (a) (b)		3,708		669,257
Akamai Technologies, Inc. (a) (b)		349		37,957
Amphenol Corp. Class A (b)		1,377		158,837
Analog Devices, Inc. (b)		1,164		230,228
ANSYS, Inc. (a) (b)		203		70,473
Apple, Inc. (b)		33,350		5,718,858
Applied Materials, Inc. (b)		1,904		392,662
Arista Networks, Inc. (a) (b)		575		166,738
Autodesk, Inc. (a) (b)		501		130,470
Broadcom, Inc. (b)		1,010		1,338,664
Cadence Design Systems, Inc. (a) (b)		621		193,305
CDW Corp. (b)		304		77,757
Cisco Systems, Inc. (b)		9,450		471,649
Cognizant Technology Solutions Corp. Class A (b)		1,168		85,603
Corning, Inc. (b)		1,724		56,823
Enphase Energy, Inc. (a) (b)		306		37,020
EPAM Systems, Inc. (a) (b)		132		36,453
F5, Inc. (a) (b)		135		25,595
Fair Isaac Corp. (a) (b)		58		72,477
First Solar, Inc. (a) (b)		249		42,031

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Fortinet, Inc. (a) (b)		1,446	$	98,776
Gartner, Inc. (a) (b)		180		85,801
Gen Digital, Inc. (b)		1,309		29,322
Hewlett Packard Enterprise Co. (b)		2,980		52,835
HP, Inc. (b)		2,063		62,344
Intel Corp. (b)		9,697		428,316
International Business Machines Corp. (b)		2,095		400,061
Intuit, Inc. (b)		641		416,650
Jabil, Inc. (b)		298		39,917
Juniper Networks, Inc. (b)		826		30,612
Keysight Technologies, Inc. (a) (b)		394		61,614
KLA Corp. (b)		308		215,160
Lam Research Corp. (b)		299		290,499
Microchip Technology, Inc. (b)		1,251		112,227
Micron Technology, Inc. (b)		2,529		298,144
Microsoft Corp. (b)		17,075		7,183,794
Monolithic Power Systems, Inc. (b)		114		77,226
Motorola Solutions, Inc. (b)		373		132,408
NetApp, Inc. (b)		481		50,491
NVIDIA Corp. (b)		5,675		5,127,703
NXP Semiconductors NV (b)		598		148,166
ON Semiconductor Corp. (a) (b)		998		73,403
Oracle Corp. (b)		3,659		459,607
Palo Alto Networks, Inc. (a) (b)		721		204,858
PTC, Inc. (a) (b)		265		50,069
Qorvo, Inc. (a) (b)		243		27,904
QUALCOMM, Inc. (b)		2,557		432,900
Roper Technologies, Inc. (b)		247		138,527
Salesforce, Inc. (b)		2,221		668,921
Seagate Technology Holdings PLC (b)		440		40,942
ServiceNow, Inc. (a) (b)		469		357,566
Skyworks Solutions, Inc. (b)		373		40,403
Super Micro Computer, Inc. (a) (b)		114		115,143
Synopsys, Inc. (a) (b)		348		198,882
TE Connectivity Ltd. (b)		679		98,618
Teledyne Technologies, Inc. (a) (b)		107		45,937
Teradyne, Inc. (b)		349		39,378
Texas Instruments, Inc. (b)		2,077		361,834
Trimble, Inc. (a) (b)		563		36,235
Tyler Technologies, Inc. (a) (b)		107		45,476
VeriSign, Inc. (a) (b)		201		38,092
Western Digital Corp. (a) (b)		791		53,978
Zebra Technologies Corp. Class A (a) (b)		118		35,570
				29,940,861
Materials — 2.4%
Air Products & Chemicals, Inc. (b)		514		124,527
Albemarle Corp. (b)		280		36,887
Amcor PLC (b)		2,886		27,446
Avery Dennison Corp. (b)		187		41,748
Ball Corp. (b)		752		50,655
Celanese Corp. (b)		248		42,621
CF Industries Holdings, Inc. (b)		427		35,531
Corteva, Inc. (b)		1,679		96,828
Dow, Inc. (b)		1,590		92,109
DuPont de Nemours, Inc. (b)		986		75,597
Eastman Chemical Co. (b)		242		24,253
Ecolab, Inc. (b)		573		132,306

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
FMC Corp. (b)		313	$	19,938
Freeport-McMoRan, Inc. (b)		3,258		153,191
International Flavors & Fragrances, Inc. (b)		560		48,154
International Paper Co. (b)		732		28,563
Linde PLC (b)		1,109		514,931
LyondellBasell Industries NV Class A (b)		587		60,038
Martin Marietta Materials, Inc. (b)		146		89,635
Mosaic Co. (b)		720		23,371
Newmont Corp. (b)		2,657		95,227
Nucor Corp. (b)		557		110,230
Packaging Corp. of America (b)		214		40,613
PPG Industries, Inc. (b)		569		82,448
Sherwin-Williams Co. (b)		546		189,642
Steel Dynamics, Inc. (b)		339		50,250
Vulcan Materials Co. (b)		318		86,788
Westrock Co. (b)		618		30,560
				2,404,087
Real Estate — 2.3%
Alexandria Real Estate Equities, Inc. (b)		349		44,990
American Tower Corp. (b)		1,048		207,074
AvalonBay Communities, Inc. (b)		300		55,668
Boston Properties, Inc. (b)		328		21,422
Camden Property Trust (b)		260		25,584
CBRE Group, Inc. Class A (a) (b)		717		69,721
CoStar Group, Inc. (a) (b)		949		91,673
Crown Castle, Inc. (b)		987		104,454
Digital Realty Trust, Inc. (b)		713		102,701
Equinix, Inc. (b)		216		178,271
Equity Residential (b)		634		40,012
Essex Property Trust, Inc. (b)		168		41,128
Extra Space Storage, Inc. (b)		507		74,529
Federal Realty Investment Trust (b)		154		15,726
Healthpeak Properties, Inc. (b)		1,582		29,662
Host Hotels & Resorts, Inc. (b)		1,624		33,584
Invitation Homes, Inc. (b)		1,387		49,391
Iron Mountain, Inc. (b)		711		57,029
Kimco Realty Corp. (b)		1,452		28,474
Mid-America Apartment Communities, Inc. (b)		289		38,027
Prologis, Inc. (b)		2,139		278,541
Public Storage (b)		345		100,071
Realty Income Corp. (b)		1,949		105,441
Regency Centers Corp. (b)		234		14,171
SBA Communications Corp. (b)		263		56,992
Simon Property Group, Inc. (b)		764		119,558
UDR, Inc. (b)		640		23,942
Ventas, Inc. (b)		990		43,105
VICI Properties, Inc. (b)		2,397		71,407
Welltower, Inc. (b)		1,282		119,790
Weyerhaeuser Co. (b)		1,738		62,412
				2,304,550
Utilities — 2.2%
AES Corp. (b)		1,719		30,822
Alliant Energy Corp. (b)		431		21,722
Ameren Corp. (b)		613		45,337
American Electric Power Co., Inc. (b)		1,220		105,042

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
American Water Works Co., Inc. (b)		413	$	50,473
Atmos Energy Corp. (b)		391		46,478
CenterPoint Energy, Inc. (b)		1,531		43,618
CMS Energy Corp. (b)		711		42,902
Consolidated Edison, Inc. (b)		858		77,915
Constellation Energy Corp. (b)		731		135,125
Dominion Energy, Inc. (b)		1,994		98,085
DTE Energy Co. (b)		403		45,192
Duke Energy Corp. (b)		1,713		165,664
Edison International (b)		816		57,716
Entergy Corp. (b)		502		53,051
Evergy, Inc. (b)		586		31,281
Eversource Energy (b)		811		48,473
Exelon Corp. (b)		2,349		88,252
FirstEnergy Corp. (b)		1,189		45,919
NextEra Energy, Inc. (b)		4,761		304,275
NiSource, Inc. (b)		1,069		29,569
NRG Energy, Inc. (b)		510		34,522
PG&E Corp. (b)		4,783		80,163
Pinnacle West Capital Corp. (b)		241		18,010
PPL Corp. (b)		1,758		48,398
Public Service Enterprise Group, Inc. (b)		1,231		82,206
Sempra (b)		1,384		99,413
Southern Co. (b)		2,435		174,687
WEC Energy Group, Inc. (b)		646		53,050
Xcel Energy, Inc. (b)		1,333		71,649
				2,229,009
TOTAL COMMON STOCK (Cost $56,292,545)				101,283,226
TOTAL EQUITIES (Cost $56,292,545)				101,283,226
	Principal Amount
BONDS & NOTES — 0.0%
CORPORATE DEBT — 0.0%
Forest Products & Paper — 0.0%
Sino Forest Corp.
5.000% 8/01/49 (c) (d)	$	359,000		—
TOTAL CORPORATE DEBT (Cost $0)				—
TOTAL BONDS & NOTES (Cost $0)				—
TOTAL PURCHASED OPTIONS(#) — 0.4% (Cost $794,227)				415,084

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
RIGHTS — 0.0%
Health Care — 0.0%
Abiomed, Inc., CVR (a) (b) (c) (d)		136	$	—
TOTAL RIGHTS (Cost $138)				—
TOTAL LONG-TERM INVESTMENTS (Cost $57,086,910)				101,698,310
	Principal Amount
SHORT-TERM INVESTMENTS — 2.6%
Repurchase Agreement — 2.6%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (e)	$	2,669,674		2,669,674
TOTAL SHORT-TERM INVESTMENTS (Cost $2,669,674)				2,669,674
TOTAL INVESTMENTS — 102.2% (Cost $59,756,584) (f)				104,367,984
Other Assets/(Liabilities) — (2.2)%				(2,235,705)
NET ASSETS — 100.0%			$	102,132,279

Abbreviation Legend

CVR Contingent Value Rights

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Non-income producing security.

(b) All or a portion of this security is pledged/held as collateral for open derivatives.

(c) Investment is valued using significant unobservable inputs.

(d) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At March 31, 2024, these securities amounted to a value of $0 or 0.00% of net assets.

(e) Maturity value of $2,670,148. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $2,723,141.

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

(#) Exchange-Traded Options Purchased
Description	Expiration Date	Exercise Price		No. of Contracts		Notional Amount		Value		Premiums Paid/ (Received)		Unrealized Appreciation (Depreciation)
Put
S&P 500 Index	5/17/24		4,700.00		28	USD	13,160,000	$	21,000	$	136,234	$	(115,234)
S&P 500 Index	5/17/24		4,750.00		28	USD	13,300,000		22,792		109,746		(86,954)
S&P 500 Index	5/17/24		4,850.00		27	USD	13,095,000		30,888		100,859		(69,971)
S&P 500 Index	5/31/24		4,850.00		27	USD	13,095,000		45,360		97,619		(52,259)
S&P 500 Index	6/21/24		4,900.00		27	USD	13,230,000		80,730		129,613		(48,883)
S&P 500 Index	6/21/24		4,950.00		27	USD	13,365,000		89,910		99,238		(9,328)
S&P 500 Index	6/28/24		5,000.00		28	USD	14,000,000		124,404		120,918		3,486
								$	415,084	$	794,227	$	(379,143)

Exchange-Traded Options Written
Description	Expiration Date	Exercise Price		No. of Contracts		Notional Amount		Value		Premiums Paid/ (Received)		Unrealized Appreciation (Depreciation)
Call
S&P 500 Index	4/30/24		5,125.00		21	USD	10,762,500	$	(360,570)	$	(91,063)	$	(269,507)
S&P 500 Index	4/30/24		5,200.00		22	USD	11,440,000		(253,066)		(91,245)		(161,821)
S&P 500 Index	5/17/24		5,175.00		22	USD	11,385,000		(368,324)		(123,928)		(244,396)
S&P 500 Index	5/17/24		5,275.00		22	USD	11,605,000		(201,982)		(111,353)		(90,629)
S&P 500 Index	5/17/24		5,350.00		21	USD	11,235,000		(116,760)		(76,559)		(40,201)
S&P 500 Index	5/31/24		5,400.00		21	USD	11,340,000		(116,760)		(85,185)		(31,575)
S&P 500 Index	6/21/24		5,425.00		21	USD	11,392,500		(136,479)		(131,711)		(4,768)
S&P 500 Index	6/21/24		5,450.00		21	USD	11,445,000		(121,170)		(140,396)		19,226
S&P 500 Index	6/28/24		5,500.00		21	USD	11,550,000		(100,590)		(104,927)		4,337
								$	(1,775,701)	$	(956,367)	$	(819,334)

Currency Legend

USD U.S. Dollar

MML Mid Cap Growth Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 96.8%
COMMON STOCK — 96.6%
Communication Services — 6.2%
Liberty Media Corp-Liberty Formula One Class C (a)		31,260	$	2,050,656
Match Group, Inc. (a)		41,095		1,490,927
New York Times Co. Class A		24,600		1,063,212
Pinterest, Inc. Class A (a)		64,240		2,227,201
Reddit, Inc. (a) (b)		4,870		240,188
Spotify Technology SA (a)		29,030		7,661,017
Take-Two Interactive Software, Inc. (a)		14,134		2,098,758
Trade Desk, Inc. Class A (a)		59,000		5,157,780
				21,989,739
Consumer Discretionary — 11.0%
Bath & Body Works, Inc.		46,700		2,335,934
Birkenstock Holding PLC (a)		11,857		560,243
Bright Horizons Family Solutions, Inc. (a)		8,300		940,888
Burlington Stores, Inc. (a)		13,000		3,018,470
Caesars Entertainment, Inc. (a)		33,105		1,448,013
Chipotle Mexican Grill, Inc. (a)		100		290,677
Domino's Pizza, Inc.		9,402		4,671,666
DoorDash, Inc., Class A (a)		18,000		2,478,960
DraftKings, Inc. Class A (a)		46,657		2,118,694
Five Below, Inc. (a) (b)		8,300		1,505,454
Hilton Worldwide Holdings, Inc.		21,700		4,628,827
Lululemon Athletica, Inc. (a)		1,300		507,845
On Holding AG, Class A (a) (b)		49,695		1,758,209
Ross Stores, Inc.		46,707		6,854,719
Tractor Supply Co.		2,685		702,718
Ulta Beauty, Inc. (a)		4,100		2,143,808
Yum! Brands, Inc.		24,207		3,356,301
				39,321,426
Consumer Staples — 4.1%
Boston Beer Co., Inc. Class A (a)		2,094		637,455
Casey's General Stores, Inc.		7,300		2,324,685
Celsius Holdings, Inc. (a)		18,653		1,546,707
Dollar General Corp.		4,574		713,818
Dollar Tree, Inc. (a)		21,229		2,826,641
elf Beauty, Inc. (a)		7,322		1,435,332
Freshpet, Inc. (a)		16,233		1,880,755
Kenvue, Inc.		37,262		799,643
McCormick & Co., Inc.		8,200		629,842
Reynolds Consumer Products, Inc.		31,800		908,208
TreeHouse Foods, Inc. (a)		24,507		954,548
				14,657,634

MML Mid Cap Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Energy — 4.3%
Cheniere Energy, Inc.		37,065	$	5,977,843
Chesapeake Energy Corp. (b)		14,100		1,252,503
Coterra Energy, Inc.		47,200		1,315,936
EQT Corp.		56,800		2,105,576
Range Resources Corp.		28,900		995,027
TechnipFMC PLC		95,408		2,395,695
Weatherford International PLC (a)		9,500		1,096,490
				15,139,070
Financials — 7.2%
Ares Management Corp. Class A		23,198		3,084,870
Assurant, Inc.		16,100		3,030,664
Axis Capital Holdings Ltd.		12,500		812,750
Cboe Global Markets, Inc.		7,400		1,359,602
Corpay, Inc. (a)		6,400		1,974,656
Intercontinental Exchange, Inc.		21,600		2,968,488
KKR & Co., Inc.		31,300		3,148,154
Markel Group, Inc. (a)		620		943,318
MarketAxess Holdings, Inc.		6,200		1,359,350
Raymond James Financial, Inc.		15,200		1,951,984
Toast, Inc., Class A (a)		16,500		411,180
Tradeweb Markets, Inc. Class A		43,053		4,484,831
				25,529,847
Health Care — 22.1%
Acadia Healthcare Co., Inc. (a)		33,700		2,669,714
Agilent Technologies, Inc.		40,300		5,864,053
Alcon, Inc.		25,200		2,098,908
Align Technology, Inc. (a)		8,298		2,721,080
Alnylam Pharmaceuticals, Inc. (a)		24,558		3,670,193
Apellis Pharmaceuticals, Inc. (a)		10,682		627,888
Argenx SE ADR (a)		4,123		1,623,308
Ascendis Pharma AS ADR (a)		6,200		937,254
Avantor, Inc. (a)		161,600		4,132,112
Biogen, Inc. (a)		9,600		2,070,048
Bruker Corp.		44,358		4,166,991
Catalent, Inc. (a)		16,348		922,845
The Cooper Cos., Inc.		27,600		2,800,296
CRISPR Therapeutics AG (a) (b)		8,175		557,208
Cytokinetics, Inc. (a) (b)		8,200		574,902
DENTSPLY SIRONA, Inc.		35,200		1,168,288
Enovis Corp. (a)		25,978		1,622,326
Exact Sciences Corp. (a)		39,335		2,716,475
Hologic, Inc. (a)		87,100		6,790,316
ICON PLC (a)		6,518		2,189,722
Inspire Medical Systems, Inc. (a)		9,494		2,039,216
Ionis Pharmaceuticals, Inc. (a)		38,500		1,668,975
Mettler-Toledo International, Inc. (a)		1,060		1,411,167
Molina Healthcare, Inc. (a)		12,447		5,113,601
Quidelortho Corp. (a)		27,133		1,300,756
Repligen Corp. (a)		15,988		2,940,513
Sarepta Therapeutics, Inc. (a)		7,220		934,701
Teleflex, Inc.		20,940		4,736,000
Vaxcyte, Inc. (a)		5,430		370,923
Veeva Systems, Inc. Class A (a)		29,359		6,802,187

MML Mid Cap Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
West Pharmaceutical Services, Inc.		4,035	$	1,596,690
				78,838,656
Industrials — 15.9%
Axon Enterprise, Inc. (a)		7,844		2,454,231
Broadridge Financial Solutions, Inc.		10,500		2,151,030
Builders FirstSource, Inc. (a)		10,021		2,089,879
BWX Technologies, Inc.		50,445		5,176,666
Clean Harbors, Inc. (a)		16,622		3,346,175
Equifax, Inc.		15,100		4,039,552
Esab Corp.		25,183		2,784,484
Ferguson PLC		5,300		1,157,679
Fortive Corp.		36,500		3,139,730
Howmet Aerospace, Inc.		5,000		342,150
IDEX Corp.		6,600		1,610,532
Ingersoll Rand, Inc.		45,300		4,301,235
JB Hunt Transport Services, Inc.		20,900		4,164,325
Paylocity Holding Corp. (a)		15,300		2,629,458
Quanta Services, Inc.		3,300		857,340
Shoals Technologies Group, Inc. Class A (a)		21,600		241,488
Southwest Airlines Co.		45,200		1,319,388
Textron, Inc.		52,693		5,054,839
TransUnion		49,676		3,964,145
United Rentals, Inc.		2,770		1,997,475
Veralto Corp.		16,200		1,436,292
Verisk Analytics, Inc.		5,800		1,367,234
Waste Connections, Inc.		5,700		980,457
				56,605,784
Information Technology — 19.9%
Amphenol Corp. Class A		21,900		2,526,165
Aspen Technology, Inc. (a)		12,804		2,730,837
Astera Labs, Inc. (a)		709		52,601
Atlassian Corp. Class A (a)		4,700		917,017
CCC Intelligent Solutions Holdings, Inc. (a)		175,601		2,100,188
CDW Corp.		17,450		4,463,361
Cognex Corp.		24,000		1,018,080
Crowdstrike Holdings, Inc. Class A (a)		13,610		4,363,230
Fair Isaac Corp. (a)		2,450		3,061,544
Fortinet, Inc. (a)		20,700		1,414,017
Gartner, Inc. (a)		9,746		4,645,626
HubSpot, Inc. (a)		3,460		2,167,898
Keysight Technologies, Inc. (a)		20,900		3,268,342
KLA Corp.		1,984		1,385,963
Lattice Semiconductor Corp. (a) (b)		40,300		3,152,669
Littelfuse, Inc.		1,800		436,230
Marvell Technology, Inc.		101,407		7,187,728
Microchip Technology, Inc.		85,300		7,652,263
MongoDB, Inc. (a)		8,070		2,894,225
NXP Semiconductors NV		5,400		1,337,958
PTC, Inc. (a)		39,092		7,386,042
Pure Storage, Inc. Class A (a)		13,300		691,467
Roper Technologies, Inc.		2,450		1,374,058
Silicon Laboratories, Inc. (a)		15,368		2,208,689
Tyler Technologies, Inc. (a)		5,300		2,252,553
				70,688,751

MML Mid Cap Growth Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Materials — 4.2%
Avery Dennison Corp.		16,000	$	3,572,000
Ball Corp.		72,747		4,900,238
Martin Marietta Materials, Inc.		6,460		3,966,052
RPM International, Inc.		9,900		1,177,605
Sealed Air Corp.		40,000		1,488,000
				15,103,895
Real Estate — 1.7%
CoStar Group, Inc. (a)		41,797		4,037,590
SBA Communications Corp.		9,587		2,077,503
				6,115,093
TOTAL COMMON STOCK (Cost $249,732,400)				343,989,895
PREFERRED STOCK — 0.2%
Consumer Discretionary — 0.0%
Nuro, Inc., Series D (Acquired 10/29/21, Cost $159,220) (a) (c) (d) (e)		7,638		31,239
Health Care — 0.0%
Caris Life Sciences, Inc., Series D (Acquired 5/11/21, Cost $271,366) (a) (c) (d) (e)		33,502		121,947
Industrials — 0.1%
Sila Nanotechnologies, Inc., Series F (Acquired 1/07/21, Cost $407,982) (a) (c) (d) (e)		9,885		200,468
Information Technology — 0.0%
Databricks, Inc., Series H (Acquired 8/31/21, Cost $185,327) (a) (c) (d) (e)		2,522		185,367
Materials — 0.1%
Redwood Materials, Inc., Series C (Acquired 5/28/21, Cost $200,090) (a) (c) (d) (e)		4,221		201,493
TOTAL PREFERRED STOCK (Cost $1,223,984)				740,514
TOTAL EQUITIES (Cost $250,956,384)				344,730,409
TOTAL LONG-TERM INVESTMENTS (Cost $250,956,384)				344,730,409
SHORT-TERM INVESTMENTS — 2.8%
Investment of Cash Collateral from Securities Loaned — 0.2%
State Street Navigator Securities Lending Government Money Market Portfolio (f)		542,618		542,618
Mutual Fund — 0.0%
T. Rowe Price Treasury Reserve Fund		108		108

MML Mid Cap Growth Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Repurchase Agreement — 2.6%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (g)	$	9,351,186	$	9,351,186
TOTAL SHORT-TERM INVESTMENTS (Cost $9,893,912)				9,893,912
TOTAL INVESTMENTS — 99.6% (Cost $260,850,296) (h)				354,624,321
Other Assets/(Liabilities) — 0.4%				1,369,333
NET ASSETS — 100.0%			$	355,993,654

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 March 31, 2024, was $8,950,689 or 2.51% of net assets. The Fund received $8,662,760 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) Investment is valued using significant unobservable inputs.

(d) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At March 31, 2024, these securities amounted to a value of $740,514 or 0.21% of net assets.

(e) Restricted security. Certain securities are restricted to resale. At March 31, 2024, these securities amounted to a value of $740,514 or 0.21% of net assets. The Fund generally bears the costs, if any, associated with the disposition of restricted securities.

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

(g) Maturity value of $9,352,848. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $9,538,241.

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

MML Mid Cap Value Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.3%
COMMON STOCK — 98.5%
Communication Services — 3.1%
BCE, Inc.		58,706	$	1,994,933
Electronic Arts, Inc.		7,113		943,682
Fox Corp. Class B		56,751		1,624,214
Interpublic Group of Cos., Inc.		102,213		3,335,210
Omnicom Group, Inc.		6,332		612,684
				8,510,723
Consumer Discretionary — 3.5%
Aptiv PLC (a)		25,629		2,041,350
BorgWarner, Inc.		66,232		2,300,900
Cie Generale des Etablissements Michelin SCA Class A		24,595		942,974
Darden Restaurants, Inc.		8,855		1,480,113
Mohawk Industries, Inc. (a)		13,365		1,749,345
Sodexo SA		10,993		942,556
				9,457,238
Consumer Staples — 11.3%
Conagra Brands, Inc.		221,476		6,564,549
Dollar Tree, Inc. (a)		28,782		3,832,323
General Mills, Inc.		46,328		3,241,570
Heineken NV		21,751		2,095,831
Kenvue, Inc.		139,553		2,994,807
Kimberly-Clark Corp.		41,762		5,401,915
Koninklijke Ahold Delhaize NV		169,848		5,078,426
Pernod Ricard SA		8,381		1,355,118
				30,564,539
Energy — 5.7%
Baker Hughes Co.		87,534		2,932,389
Coterra Energy, Inc.		50,672		1,412,735
Enterprise Products Partners LP (b)		189,929		5,542,128
EQT Corp.		59,556		2,207,741
Occidental Petroleum Corp.		51,150		3,324,239
				15,419,232
Financials — 16.9%
Aflac, Inc.		20,042		1,720,806
AllianceBernstein Holding LP (b)		22,743		790,092
Allstate Corp.		27,140		4,695,491
Ameriprise Financial, Inc.		3,350		1,468,774
Bank of New York Mellon Corp.		100,259		5,776,924
Commerce Bancshares, Inc.		45,123		2,400,544
First Hawaiian, Inc.		62,012		1,361,783
Hanover Insurance Group, Inc.		16,181		2,203,367

MML Mid Cap Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Northern Trust Corp.		65,934	$	5,862,851
PNC Financial Services Group, Inc.		9,072		1,466,035
Reinsurance Group of America, Inc.		19,750		3,809,380
T. Rowe Price Group, Inc.		27,560		3,360,115
Truist Financial Corp.		102,904		4,011,198
US Bancorp		26,905		1,202,653
Westamerica BanCorp		27,603		1,349,235
Willis Towers Watson PLC		15,252		4,194,300
				45,673,548
Health Care — 15.3%
Becton Dickinson & Co.		8,214		2,032,554
Cardinal Health, Inc.		26,979		3,018,950
Cencora, Inc.		4,328		1,051,661
Centene Corp. (a)		24,719		1,939,947
DENTSPLY SIRONA, Inc.		49,391		1,639,287
Envista Holdings Corp. (a)		78,670		1,681,965
GE HealthCare Technologies, Inc. (a)		18,415		1,674,108
Henry Schein, Inc. (a)		71,338		5,387,446
Hologic, Inc. (a)		31,201		2,432,430
Laboratory Corp. of America Holdings		12,600		2,752,596
Quest Diagnostics, Inc.		40,341		5,369,790
Universal Health Services, Inc. Class B		22,108		4,033,826
Zimmer Biomet Holdings, Inc.		62,777		8,285,308
				41,299,868
Industrials — 14.3%
Atkore, Inc.		4,089		778,382
Beacon Roofing Supply, Inc. (a)		29,227		2,864,831
Bunzl PLC		66,956		2,578,382
Cie de Saint-Gobain SA		26,259		2,036,275
Cummins, Inc.		4,639		1,366,881
Dover Corp.		4,532		803,025
Emerson Electric Co.		35,691		4,048,073
General Dynamics Corp.		3,805		1,074,875
Heartland Express, Inc.		75,009		895,608
Huntington Ingalls Industries, Inc.		6,243		1,819,647
Johnson Controls International PLC		32,422		2,117,805
MSC Industrial Direct Co., Inc. Class A		21,408		2,077,432
Norfolk Southern Corp.		17,079		4,352,925
Oshkosh Corp.		20,230		2,522,883
Republic Services, Inc.		8,329		1,594,504
Southwest Airlines Co.		109,790		3,204,770
Timken Co.		15,523		1,357,176
Vinci SA		24,846		3,182,470
				38,675,944
Information Technology — 6.4%
Amdocs Ltd.		35,558		3,213,376
Cognizant Technology Solutions Corp. Class A		17,152		1,257,070
F5, Inc. (a)		17,921		3,397,642
HP, Inc.		94,776		2,864,131
Juniper Networks, Inc.		53,382		1,978,337
TE Connectivity Ltd.		17,844		2,591,663

MML Mid Cap Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Teradyne, Inc.		18,901	$	2,132,600
				17,434,819
Materials — 3.8%
Akzo Nobel NV		40,077		2,989,202
Amcor PLC		201,838		1,919,479
Packaging Corp. of America		16,284		3,090,378
Sonoco Products Co.		37,527		2,170,562
				10,169,621
Real Estate — 6.6%
Equity Residential		31,132		1,964,741
Essex Property Trust, Inc.		5,168		1,265,178
Healthpeak Properties, Inc.		165,607		3,105,131
Public Storage		9,961		2,889,288
Realty Income Corp.		76,086		4,116,253
Regency Centers Corp.		46,249		2,800,839
VICI Properties, Inc.		55,436		1,651,438
				17,792,868
Utilities — 11.6%
CMS Energy Corp.		41,122		2,481,301
Duke Energy Corp.		43,542		4,210,947
Edison International		62,490		4,419,918
Evergy, Inc.		56,155		2,997,554
Eversource Energy		47,536		2,841,227
Northwestern Energy Group, Inc.		84,255		4,291,107
ONE Gas, Inc.		27,017		1,743,407
Pinnacle West Capital Corp.		35,290		2,637,222
Spire, Inc.		50,466		3,097,098
WEC Energy Group, Inc.		30,889		2,536,605
				31,256,386
TOTAL COMMON STOCK (Cost $257,756,746)				266,254,786
PREFERRED STOCK — 0.8%
Consumer Staples — 0.8%
Henkel AG & Co. KGaA 2.487%
		26,741		2,149,103
TOTAL PREFERRED STOCK (Cost $1,781,470)				2,149,103
TOTAL EQUITIES (Cost $259,538,216)				268,403,889
TOTAL LONG-TERM INVESTMENTS (Cost $259,538,216)				268,403,889

MML Mid Cap Value Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
SHORT-TERM INVESTMENTS — 0.7%
Repurchase Agreement — 0.7%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (c)	$	2,016,999	$	2,016,999
TOTAL SHORT-TERM INVESTMENTS (Cost $2,016,999)				2,016,999
TOTAL INVESTMENTS — 100.0% (Cost $261,555,215) (d)				270,420,888
Other Assets/(Liabilities) — 0.0%				30,323
NET ASSETS — 100.0%			$	270,451,211

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Non-income producing security.

(b) Security is a Master Limited Partnership.

(c) Maturity value of $2,017,358. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $2,057,441.

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

Forward contracts
Counterparty	Settlement Date	Currency Purchased		Currency Sold		Unrealized Appreciation (Depreciation)
Bank of America N.A.	6/28/24	USD	5,768,247	EUR	5,304,633	$	25,293
Goldman Sachs & Co.	6/28/24	USD	1,701,104	CAD	2,307,880		(4,825)
JP Morgan Chase Bank N.A.	6/28/24	USD	6,335,532	EUR	5,829,593		24,240
Morgan Stanley & Co. LLC	6/28/24	USD	2,204,490	GBP	1,742,095		4,719
Morgan Stanley & Co. LLC	6/28/24	USD	5,769,836	EUR	5,304,633		26,881
						$	76,308

Currency Legend

CAD	Canadian Dollar
EUR	Euro
GBP	British Pound
USD	U.S. Dollar

MML Small Cap Growth Equity Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 97.7%
COMMON STOCK — 97.7%
Communication Services — 3.1%
Cargurus, Inc. (a)		54,997	$	1,269,331
Cinemark Holdings, Inc. (a)		42,975		772,260
Criteo SA Sponsored ADR (a)		21,343		748,499
Eventbrite, Inc. Class A (a)		102,108		559,552
New York Times Co. Class A		19,322		835,097
Ziff Davis, Inc. (a)		10,427		657,318
				4,842,057
Consumer Discretionary — 11.1%
Abercrombie & Fitch Co. Class A (a)		5,265		659,862
Acushnet Holdings Corp.		8,549		563,807
American Eagle Outfitters, Inc.		14,800		381,692
Boot Barn Holdings, Inc. (a)		14,440		1,373,966
Boyd Gaming Corp.		14,173		954,126
Carter's, Inc.		7,888		667,956
Century Communities, Inc.		8,673		836,945
Crocs, Inc. (a)		4,922		707,784
Duolingo, Inc. (a)		1,601		353,149
European Wax Center, Inc. Class A (a)		41,142		534,023
Genius Sports Ltd. (a) (b)		91,849		524,458
Global-e Online Ltd. (a)		16,838		612,061
Goodyear Tire & Rubber Co. (a)		50,565		694,257
H&R Block, Inc.		18,511		909,075
Modine Manufacturing Co. (a)		7,183		683,750
Papa John's International, Inc.		10,055		669,663
Patrick Industries, Inc.		4,428		529,013
Skyline Champion Corp. (a)		26,058		2,215,191
Steven Madden Ltd. (b)		17,991		760,659
Visteon Corp. (a)		5,012		589,461
Wingstop, Inc.		2,392		876,429
YETI Holdings, Inc. (a)		28,144		1,084,951
				17,182,278
Consumer Staples — 4.0%
BellRing Brands, Inc. (a)		9,716		573,536
Celsius Holdings, Inc. (a)		20,758		1,721,254
elf Beauty, Inc. (a)		11,672		2,288,062
Freshpet, Inc. (a)		8,776		1,016,787
Simply Good Foods Co. (a)		17,310		589,059
				6,188,698
Energy — 6.4%
Cactus, Inc. Class A		21,131		1,058,452
Chord Energy Corp.		11,034		1,966,700

MML Small Cap Growth Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Gulfport Energy Corp. (a)		6,170	$	987,940
Magnolia Oil & Gas Corp. Class A		34,697		900,387
Seadrill Ltd. (a)		30,163		1,517,199
Sitio Royalties Corp. Class A		32,197		795,910
Viper Energy, Inc.		66,869		2,571,782
				9,798,370
Financials — 9.7%
Ameris Bancorp		18,224		881,677
Assured Guaranty Ltd.		11,127		970,831
Cadence Bank		58,492		1,696,268
Hancock Whitney Corp.		19,649		904,640
Hannon Armstrong Sustainable Infrastructure Capital, Inc. (b)		58,346		1,657,027
Kemper Corp.		15,310		947,995
MGIC Investment Corp.		29,153		651,861
National Bank Holdings Corp. Class A		25,131		906,475
PJT Partners, Inc. Class A		14,720		1,387,507
PRA Group, Inc. (a)		35,566		927,561
Seacoast Banking Corp. of Florida		33,472		849,854
Selective Insurance Group, Inc.		7,435		811,679
SiriusPoint Ltd. (a)		64,751		822,985
StepStone Group, Inc. Class A		20,381		728,417
UMB Financial Corp.		9,008		783,606
				14,928,383
Health Care — 16.8%
Acadia Healthcare Co., Inc. (a)		17,551		1,390,390
Akero Therapeutics, Inc. (a) (b)		25,096		633,925
Amicus Therapeutics, Inc. (a)		25,886		304,937
Apellis Pharmaceuticals, Inc. (a)		10,946		643,406
Apogee Therapeutics, Inc. (a)		7,486		497,445
Axsome Therapeutics, Inc. (a)		3,550		283,290
Blueprint Medicines Corp. (a)		6,039		572,859
Celldex Therapeutics, Inc. (a)		13,728		576,164
Crinetics Pharmaceuticals, Inc. (a)		17,978		841,550
Cytokinetics, Inc. (a)		13,137		921,035
Disc Medicine, Inc. (a)		4,473		278,489
Evolent Health, Inc. Class A (a)		21,405		701,870
Glaukos Corp. (a)		5,963		562,251
Globus Medical, Inc. Class A (a)		13,704		735,083
Haemonetics Corp. (a)		22,543		1,924,045
HealthEquity, Inc. (a)		9,528		777,771
Immatics NV (a)		55,906		587,572
Immunocore Holdings PLC ADR (a)		6,161		400,465
Inari Medical, Inc. (a)		12,033		577,343
Inspire Medical Systems, Inc. (a)		4,153		892,023
Intellia Therapeutics, Inc. (a)		6,969		191,717
Intra-Cellular Therapies, Inc. (a)		8,594		594,705
Kymera Therapeutics, Inc. (a)		15,193		610,759
Longboard Pharmaceuticals, Inc. (a)		10,186		220,018
Merus NV (a)		8,984		404,549
Morphic Holding, Inc. (a)		10,552		371,430
Myriad Genetics, Inc. (a)		35,960		766,667
PROCEPT BioRobotics Corp. (a) (b)		31,873		1,575,164
Prothena Corp. PLC (a)		4,575		113,323
PTC Therapeutics, Inc. (a)		8,612		250,523
Revolution Medicines, Inc. (a)		33,605		1,083,089

MML Small Cap Growth Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Rocket Pharmaceuticals, Inc. (a)		35,989	$	969,544
Shockwave Medical, Inc. (a)		3,225		1,050,157
Spyre Therapeutics, Inc. (a) (b)		4,600		174,478
Structure Therapeutics, Inc. ADR (a)		11,530		494,176
Surgery Partners, Inc. (a)		22,701		677,171
Syndax Pharmaceuticals, Inc. (a)		18,698		445,012
Vaxcyte, Inc. (a)		9,639		658,440
Veracyte, Inc. (a)		25,649		568,382
Verona Pharma PLC ADR (a) (b)		18,424		296,442
Xenon Pharmaceuticals, Inc. (a)		7,656		329,591
				25,947,250
Industrials — 23.4%
Acuity Brands, Inc.		2,884		775,017
Air Lease Corp.		23,851		1,226,895
Ameresco, Inc. Class A (a)		16,193		390,737
Applied Industrial Technologies, Inc.		10,481		2,070,522
Aris Water Solutions, Inc. Class A		23,965		339,105
Atmus Filtration Technologies, Inc. (a)		14,200		457,950
AZEK Co., Inc. (a)		54,201		2,721,974
Boise Cascade Co.		6,964		1,068,069
Casella Waste Systems, Inc. Class A (a)		9,147		904,364
Comfort Systems USA, Inc.		4,715		1,498,003
Curtiss-Wright Corp.		5,371		1,374,654
Enpro, Inc.		5,800		978,866
Exlservice Holdings, Inc. (a)		41,221		1,310,828
Flowserve Corp.		20,590		940,551
Fluor Corp. (a)		70,103		2,963,955
GATX Corp.		5,838		782,467
Helios Technologies, Inc.		17,040		761,518
Herc Holdings, Inc.		4,170		701,811
Kennametal, Inc. (b)		20,928		521,944
Kirby Corp. (a)		10,269		978,841
Leonardo DRS, Inc. (a)		25,788		569,657
ManpowerGroup, Inc.		9,455		734,086
McGrath RentCorp		5,950		734,052
Middleby Corp. (a)		4,498		723,233
NEXTracker, Inc. Class A (a)		12,433		699,605
Rush Enterprises, Inc. Class A		40,889		2,188,379
RXO, Inc. (a)		32,774		716,767
Ryder System, Inc.		6,888		827,869
Shoals Technologies Group, Inc. Class A (a)		93,664		1,047,164
TriNet Group, Inc.		9,061		1,200,492
Verra Mobility Corp. (a)		76,753		1,916,522
Zurn Elkay Water Solutions Corp. Class C		61,279		2,051,008
				36,176,905
Information Technology — 13.5%
Belden, Inc.		8,782		813,301
Calix, Inc. (a)		8,279		274,532
Cirrus Logic, Inc. (a)		6,511		602,658
Clearwater Analytics Holdings, Inc. Class A (a)		38,626		683,294
Crane NXT Co.		14,177		877,556
CyberArk Software Ltd. (a)		4,685		1,244,477
DoubleVerify Holdings, Inc. (a)		50,703		1,782,717
ePlus, Inc. (a)		6,078		477,366
Fabrinet (a)		2,056		388,625

MML Small Cap Growth Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Five9, Inc. (a)		11,693	$	726,252
FormFactor, Inc. (a)		16,568		755,998
Intapp, Inc. (a)		10,607		363,820
Jamf Holding Corp. (a)		77,758		1,426,859
Manhattan Associates, Inc. (a)		3,263		816,501
MKS Instruments, Inc.		5,392		717,136
Novanta, Inc. (a)		5,818		1,016,812
Perficient, Inc. (a)		11,381		640,637
Power Integrations, Inc.		8,887		635,865
PowerSchool Holdings, Inc. Class A (a)		50,224		1,069,269
Rapid7, Inc. (a)		12,359		606,085
SiTime Corp. (a)		4,200		391,566
Sprout Social, Inc. Class A (a)		26,708		1,594,735
Squarespace, Inc. Class A (a)		34,816		1,268,695
Synaptics, Inc. (a)		6,759		659,408
Universal Display Corp.		2,121		357,282
Viavi Solutions, Inc. (a)		73,307		666,361
				20,857,807
Materials — 3.5%
Arcadium Lithium PLC (a) (b)		171,931		741,022
Cabot Corp.		30,586		2,820,029
Graphic Packaging Holding Co.		33,216		969,243
Methanex Corp.		19,176		855,825
				5,386,119
Real Estate — 5.2%
American Healthcare REIT, Inc.		41,817		616,801
Douglas Emmett, Inc. (b)		43,602		604,760
Essential Properties Realty Trust, Inc.		32,456		865,277
National Storage Affiliates Trust		18,637		729,825
Phillips Edison & Co., Inc.		46,746		1,676,779
PotlatchDeltic Corp.		9,926		466,720
Ryman Hospitality Properties, Inc.		11,402		1,318,185
Terreno Realty Corp.		12,502		830,133
Xenia Hotels & Resorts, Inc.		56,687		850,872
				7,959,352
Utilities — 1.0%
IDACORP, Inc.		7,947		738,197
ONE Gas, Inc.		12,198		787,137
				1,525,334
TOTAL COMMON STOCK (Cost $123,394,397)				150,792,553
TOTAL EQUITIES (Cost $123,394,397)				150,792,553
EXCHANGE-TRADED FUNDS — 1.0%
iShares Russell 2000 ETF (b)		5,178		1,088,933

MML Small Cap Growth Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
iShares Russell 2000 Growth ETF (b)		1,731	$	468,755
TOTAL EXCHANGE-TRADED FUNDS (Cost $1,525,870)				1,557,688
TOTAL LONG-TERM INVESTMENTS (Cost $124,920,267)				152,350,241
SHORT-TERM INVESTMENTS — 2.1%
Investment of Cash Collateral from Securities Loaned — 1.0%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		1,517,043		1,517,043
	Principal Amount
Repurchase Agreement — 1.1%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (d)	$	1,736,926		1,736,926
TOTAL SHORT-TERM INVESTMENTS (Cost $3,253,969)				3,253,969
TOTAL INVESTMENTS — 100.8% (Cost $128,174,236) (e)				155,604,210
Other Assets/(Liabilities) — (0.8)%				(1,213,877)
NET ASSETS — 100.0%			$	154,390,333

Abbreviation Legend

ADR American Depositary Receipt

ETF Exchange-Traded Fund

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 March 31, 2024, was $7,672,352 or 4.97% of net assets. The Fund received $6,364,198 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 $1,737,235. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $1,771,774.

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

MML Small Company Value Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 101.0%
COMMON STOCK — 101.0%
Communication Services — 1.7%
Cable One, Inc.		2,398	$	1,014,666
Entravision Communications Corp. Class A		106,937		175,377
Townsquare Media, Inc. Class A		6,339		69,602
				1,259,645
Consumer Discretionary — 12.4%
Accel Entertainment, Inc. (a)		33,516		395,154
Boyd Gaming Corp.		7,878		530,347
BRP, Inc. (b)		7,507		503,720
Brunswick Corp.		10,765		1,039,038
Cavco Industries, Inc. (a)		863		344,389
Dave & Buster's Entertainment, Inc. (a)		11,364		711,386
Everi Holdings, Inc. (a)		46,521		467,536
Malibu Boats, Inc. Class A (a)		7,422		321,224
MarineMax, Inc. (a)		22,197		738,272
OneWater Marine, Inc. Class A (a) (b)		16,838		473,990
Penske Automotive Group, Inc.		3,280		531,327
Red Robin Gourmet Burgers, Inc. (a) (b)		7,638		58,507
Skyline Champion Corp. (a)		13,957		1,186,484
Solo Brands, Inc. Class A (a) (b)		52,978		114,962
Tapestry, Inc.		31,144		1,478,717
Topgolf Callaway Brands Corp. (a)		18,922		305,969
				9,201,022
Consumer Staples — 3.7%
Edgewell Personal Care Co.		31,798		1,228,675
Spectrum Brands Holdings, Inc.		13,266		1,180,806
Turning Point Brands, Inc.		10,350		303,255
				2,712,736
Energy — 11.1%
Cactus, Inc. Class A		22,135		1,108,742
ChampionX Corp.		52,774		1,894,059
Chord Energy Corp.		6,656		1,186,365
Mach Natural Resources LP		18,648		359,906
Magnolia Oil & Gas Corp. Class A		59,045		1,532,218
Northern Oil & Gas, Inc.		34,836		1,382,293
Permian Resources Corp. (b)		41,619		734,992
				8,198,575
Financials — 31.3%
A-Mark Precious Metals, Inc. (b)		18,172		557,699
Ameris Bancorp		17,999		870,792
Axis Capital Holdings Ltd.		23,879		1,552,612

MML Small Company Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Axos Financial, Inc. (a)		3,387	$	183,033
Banc of California, Inc.		22,344		339,852
BankUnited, Inc.		10,492		293,776
Columbia Banking System, Inc.		44,436		859,837
Compass Diversified Holdings (b)		54,867		1,320,649
CVB Financial Corp.		53,764		959,150
Enact Holdings, Inc.		3,490		108,818
Euronet Worldwide, Inc. (a)		10,343		1,137,006
EVERTEC, Inc.		41,646		1,661,675
Fidelis Insurance Holdings Ltd.		19,079		371,659
First BanCorp		46,892		822,486
First Interstate BancSystem, Inc. Class A		24,618		669,856
First Merchants Corp.		9,119		318,253
FNB Corp.		122,191		1,722,893
Hamilton Insurance Group Ltd. Class B (a)		18,046		251,381
Home BancShares, Inc.		53,284		1,309,188
Old National Bancorp		107,932		1,879,096
Origin Bancorp, Inc.		1,512		47,235
Pacific Premier Bancorp, Inc.		27,950		670,800
Patria Investments Ltd. Class A		16,976		251,924
Popular, Inc.		6,162		542,810
Provident Financial Services, Inc.		12,416		180,901
Repay Holdings Corp. (a)		24,444		268,884
SouthState Corp.		16,630		1,414,049
UMB Financial Corp.		10,800		939,492
Valley National Bancorp		56,973		453,505
Webster Financial Corp.		22,727		1,153,850
				23,113,161
Health Care — 2.2%
AMN Healthcare Services, Inc. (a)		3,623		226,474
Embecta Corp.		31,850		422,650
Enovis Corp. (a)		8,071		504,034
Envista Holdings Corp. (a)		22,622		483,658
				1,636,816
Industrials — 18.8%
Atmus Filtration Technologies, Inc. (a)		17,840		575,340
Barrett Business Services, Inc.		1,698		215,171
Beacon Roofing Supply, Inc. (a)		13,382		1,311,704
Brink's Co.		15,796		1,459,234
Deluxe Corp.		27,789		572,175
DIRTT Environmental Solutions (a)		117,114		57,854
DXP Enterprises, Inc. (a)		7,015		376,916
Gates Industrial Corp. PLC (a)		71,986		1,274,872
GMS, Inc. (a)		11,038		1,074,439
Hillman Solutions Corp. (a)		59,244		630,356
IBEX Holdings Ltd. (a)		12,681		195,668
Karat Packaging, Inc.		1,896		54,245
Korn Ferry		16,002		1,052,292
Loomis AB		15,047		419,524
Luxfer Holdings PLC		6,354		65,891
NV5 Global, Inc. (a)		4,024		394,392
Science Applications International Corp.		3,447		449,454
Sensata Technologies Holding PLC		12,590		462,557
Tecnoglass, Inc. (b)		19,869		1,033,784
Timken Co.		18,806		1,644,209

MML Small Company Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Titan Machinery, Inc. (a)		10,246	$	254,203
Verra Mobility Corp. (a)		11,566		288,803
				13,863,083
Information Technology — 8.6%
Avnet, Inc.		26,539		1,315,803
Axcelis Technologies, Inc. (a)		3,340		372,477
Belden, Inc.		5,888		545,288
Coherent Corp. (a)		18,549		1,124,440
Cohu, Inc. (a)		11,987		399,527
Kulicke & Soffa Industries, Inc.		21,354		1,074,320
MKS Instruments, Inc.		1,400		186,200
Teradata Corp. (a)		33,719		1,303,914
				6,321,969
Materials — 5.2%
Graphic Packaging Holding Co.		71,900		2,098,042
Ingevity Corp. (a)		6,918		329,989
Minerals Technologies, Inc.		10,974		826,123
Pactiv Evergreen, Inc.		42,255		605,091
				3,859,245
Real Estate — 4.4%
CareTrust REIT, Inc.		34,293		835,720
Ryman Hospitality Properties, Inc.		8,039		929,389
Terreno Realty Corp.		14,925		991,020
UMH Properties, Inc.		29,749		483,124
				3,239,253
Utilities — 1.6%
ALLETE, Inc.		7,590		452,667
Southwest Gas Holdings, Inc.		10,061		765,944
				1,218,611
TOTAL COMMON STOCK (Cost $69,307,224)				74,624,116
TOTAL EQUITIES (Cost $69,307,224)				74,624,116
TOTAL LONG-TERM INVESTMENTS (Cost $69,307,224)				74,624,116
SHORT-TERM INVESTMENTS — 1.6%
Investment of Cash Collateral from Securities Loaned — 1.5%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		1,089,088		1,089,088
	Principal Amount
Repurchase Agreement — 0.1%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (d)	$	115,946		115,946

MML Small Company Value Fund —  Portfolio of Investments (Continued)

	Principal Amount	Value
TOTAL SHORT-TERM INVESTMENTS (Cost $1,205,034)		$	1,205,034
TOTAL INVESTMENTS — 102.6% (Cost $70,512,258) (e)			75,829,150
Other Assets/(Liabilities) — (2.6)%			(1,954,990)
NET ASSETS — 100.0%		$	73,874,160

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 March 31, 2024, was $3,616,831 or 4.90% of net assets. The Fund received $2,580,332 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 $115,967. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $118,317.

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

Forward contracts
Counterparty	Settlement Date	Currency Purchased		Currency Sold		Unrealized Appreciation (Depreciation)
UBS AG	6/28/24	USD	365,765	SEK	3,842,101	$	5,543

Currency Legend

SEK Swedish Krona

USD U.S. Dollar

MML Small/Mid Cap Value Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.6%
COMMON STOCK — 98.6%
Communication Services — 2.6%
Criteo SA Sponsored ADR (a)		42,701	$	1,497,524
Nexstar Media Group, Inc.		12,114		2,087,121
				3,584,645
Consumer Discretionary — 18.3%
Adient PLC (a)		45,562		1,499,901
ADT, Inc.		232,631		1,563,280
AutoNation, Inc. (a)		9,490		1,571,354
Bath & Body Works, Inc.		40,787		2,040,166
BorgWarner, Inc.		51,176		1,777,854
Brunswick Corp.		19,311		1,863,898
Dick's Sporting Goods, Inc.		10,444		2,348,438
Dine Brands Global, Inc.		20,281		942,661
Papa John's International, Inc.		8,011		533,533
PulteGroup, Inc.		17,617		2,124,962
PVH Corp.		16,758		2,356,342
Ralph Lauren Corp.		10,245		1,923,601
Tapestry, Inc.		34,150		1,621,442
Taylor Morrison Home Corp. (a)		25,104		1,560,716
Williams-Sonoma, Inc.		5,252		1,667,668
				25,395,816
Consumer Staples — 2.5%
Lamb Weston Holdings, Inc.		16,839		1,793,859
Nomad Foods Ltd.		84,913		1,660,898
				3,454,757
Energy — 5.4%
Cameco Corp.		43,654		1,891,091
ChampionX Corp.		45,740		1,641,609
HF Sinclair Corp.		18,096		1,092,456
International Seaways, Inc.		20,877		1,110,656
Magnolia Oil & Gas Corp. Class A		68,070		1,766,416
				7,502,228
Financials — 17.4%
American Financial Group, Inc.		10,517		1,435,360
BankUnited, Inc.		26,087		730,436
Cboe Global Markets, Inc.		10,124		1,860,082
Comerica, Inc.		31,594		1,737,354
Everest Group Ltd.		3,460		1,375,350
Federated Hermes, Inc.		18,930		683,752
First BanCorp		95,772		1,679,841
First Citizens BancShares, Inc. Class A		1,383		2,261,205

MML Small/Mid Cap Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
First Hawaiian, Inc.		73,300	$	1,609,668
Hanover Insurance Group, Inc.		7,028		957,003
Kemper Corp.		17,304		1,071,464
Moelis & Co. Class A		19,756		1,121,548
Stifel Financial Corp.		19,971		1,561,133
Texas Capital Bancshares, Inc. (a)		21,914		1,348,807
Walker & Dunlop, Inc.		1,778		179,685
Webster Financial Corp.		27,083		1,375,004
Wintrust Financial Corp.		16,828		1,756,675
Zions Bancorp NA		30,479		1,322,788
				24,067,155
Health Care — 5.8%
Acadia Healthcare Co., Inc. (a)		12,272		972,188
AMN Healthcare Services, Inc. (a)		18,153		1,134,744
Avantor, Inc. (a)		58,480		1,495,334
Envista Holdings Corp. (a)		32,936		704,172
Fortrea Holdings, Inc. (a)		38,408		1,541,697
Integra LifeSciences Holdings Corp. (a)		37,199		1,318,704
Pediatrix Medical Group, Inc. (a)		84,452		847,053
				8,013,892
Industrials — 23.8%
ABM Industries, Inc.		25,616		1,142,986
Alaska Air Group, Inc. (a)		31,146		1,338,967
ArcBest Corp.		12,448		1,773,840
Builders FirstSource, Inc. (a)		12,630		2,633,986
Dycom Industries, Inc. (a)		13,393		1,922,297
Fluor Corp. (a)		40,910		1,729,675
Gates Industrial Corp. PLC (a)		109,030		1,930,921
Herc Holdings, Inc.		10,150		1,708,245
Korn Ferry		9,900		651,024
MasTec, Inc. (a)		20,943		1,952,935
Middleby Corp. (a)		12,771		2,053,449
MillerKnoll, Inc.		49,206		1,218,341
Oshkosh Corp.		14,285		1,781,482
Regal Rexnord Corp.		10,147		1,827,475
Robert Half, Inc.		20,379		1,615,647
Sensata Technologies Holding PLC		28,000		1,028,720
Spirit AeroSystems Holdings, Inc. Class A (a)		23,576		850,386
Star Bulk Carriers Corp.		59,963		1,431,317
Stericycle, Inc. (a)		33,306		1,756,891
WillScot Mobile Mini Holdings Corp. (a)		34,769		1,616,759
WNS Holdings Ltd. (a)		20,409		1,031,267
				32,996,610
Information Technology — 9.8%
ACI Worldwide, Inc. (a)		38,851		1,290,242
Amkor Technology, Inc.		44,170		1,424,041
Avnet, Inc.		24,205		1,200,084
Belden, Inc.		16,004		1,482,131
Calix, Inc. (a)		37,527		1,244,395
CommVault Systems, Inc. (a)		13,856		1,405,414
FormFactor, Inc. (a)		31,578		1,440,904
Gen Digital, Inc.		61,783		1,383,939
Lumentum Holdings, Inc. (a)		26,669		1,262,777

MML Small/Mid Cap Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Synaptics, Inc. (a)		14,411	$	1,405,937
				13,539,864
Materials — 3.7%
ATI, Inc. (a)		35,280		1,805,278
Avient Corp.		381		16,535
Berry Global Group, Inc.		22,594		1,366,485
Element Solutions, Inc.		75,837		1,894,408
				5,082,706
Real Estate — 6.8%
Apartment Income REIT Corp.		49,224		1,598,303
Broadstone Net Lease, Inc.		50,138		785,663
CubeSmart		18,572		839,826
First Industrial Realty Trust, Inc.		22,254		1,169,225
Jones Lang LaSalle, Inc. (a)		10,173		1,984,651
Ryman Hospitality Properties, Inc.		12,013		1,388,823
STAG Industrial, Inc.		43,828		1,684,748
				9,451,239
Utilities — 2.5%
CenterPoint Energy, Inc.		34,261		976,096
IDACORP, Inc.		12,437		1,155,273
Portland General Electric Co.		31,580		1,326,360
				3,457,729
TOTAL COMMON STOCK (Cost $118,471,655)				136,546,641
TOTAL EQUITIES (Cost $118,471,655)				136,546,641
TOTAL LONG-TERM INVESTMENTS (Cost $118,471,655)				136,546,641
	Principal Amount
SHORT-TERM INVESTMENTS — 0.5%
Repurchase Agreement — 0.5%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (b)	$	729,505		729,505
TOTAL SHORT-TERM INVESTMENTS (Cost $729,505)				729,505
TOTAL INVESTMENTS — 99.1% (Cost $119,201,160) (c)				137,276,146
Other Assets/(Liabilities) — 0.9%				1,262,483
NET ASSETS — 100.0%			$	138,538,629

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) Maturity value of $729,635. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $744,133.

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

MML Sustainable Equity Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.8%
COMMON STOCK — 99.8%
Communication Services — 8.4%
Alphabet, Inc. Class A (a)		40,066	$	6,047,161
Electronic Arts, Inc.		3,791		502,952
Liberty Media Corp-Liberty Formula One Class C (a)		2,906		190,634
Meta Platforms, Inc. Class A		7,469		3,626,797
Verizon Communications, Inc.		39,959		1,676,680
Walt Disney Co.		6,432		787,019
				12,831,243
Consumer Discretionary — 10.6%
Airbnb, Inc. Class A (a)		2,325		383,532
Amazon.com, Inc. (a)		28,170		5,081,304
Aptiv PLC (a)		12,747		1,015,298
CarMax, Inc. (a)		6,380		555,762
Chipotle Mexican Grill, Inc. (a)		147		427,295
Deckers Outdoor Corp. (a)		807		759,597
Home Depot, Inc.		6,761		2,593,520
LKQ Corp.		17,482		933,714
Starbucks Corp.		9,200		840,788
Tesla, Inc. (a)		6,885		1,210,314
TJX Cos., Inc.		14,890		1,510,144
Tractor Supply Co.		2,997		784,375
				16,095,643
Consumer Staples — 5.6%
Colgate-Palmolive Co.		4,827		434,671
Costco Wholesale Corp.		1,508		1,104,806
Mondelez International, Inc. Class A		14,074		985,180
PepsiCo, Inc.		10,301		1,802,778
Procter & Gamble Co.		8,021		1,301,407
Sysco Corp.		16,833		1,366,503
Target Corp.		8,370		1,483,248
				8,478,593
Energy — 3.7%
ConocoPhillips		17,046		2,169,615
EOG Resources, Inc.		13,473		1,722,388
Schlumberger NV		31,935		1,750,358
				5,642,361
Financials — 13.3%
American Express Co.		4,184		952,655
Ameriprise Financial, Inc.		2,164		948,784
Bank of America Corp.		37,934		1,438,457
BlackRock, Inc.		1,349		1,124,661

MML Sustainable Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Block, Inc. (a)		3,992	$	337,643
Intercontinental Exchange, Inc.		4,966		682,477
JP Morgan Chase & Co.		12,750		2,553,825
Marsh & McLennan Cos., Inc.		4,478		922,379
Mastercard, Inc. Class A		2,986		1,437,968
MetLife, Inc.		10,276		761,554
Morgan Stanley		20,175		1,899,678
Progressive Corp.		4,917		1,016,934
Prudential Financial, Inc.		6,760		793,624
Regions Financial Corp.		54,311		1,142,704
S&P Global, Inc.		3,479		1,480,141
Visa, Inc. Class A		9,526		2,658,516
				20,152,000
Health Care — 12.7%
AbbVie, Inc.		10,834		1,972,871
Agilent Technologies, Inc.		10,837		1,576,892
Amgen, Inc.		3,626		1,030,944
Bristol-Myers Squibb Co.		12,165		659,708
Cigna Group		4,575		1,661,594
Danaher Corp.		7,434		1,856,419
Dexcom, Inc. (a)		2,075		287,803
Eli Lilly & Co.		1,312		1,020,684
Intuitive Surgical, Inc. (a)		2,306		920,302
Merck & Co., Inc.		12,955		1,709,412
Novo Nordisk AS Class B		9,291		1,190,139
Thermo Fisher Scientific, Inc.		2,282		1,326,321
UnitedHealth Group, Inc.		5,063		2,504,666
Vertex Pharmaceuticals, Inc. (a)		1,431		598,172
Zoetis, Inc.		5,723		968,389
				19,284,316
Industrials — 8.9%
Cummins, Inc.		4,003		1,179,484
Deere & Co.		1,623		666,631
Eaton Corp. PLC		5,614		1,755,385
FedEx Corp.		1,794		519,793
Generac Holdings, Inc. (a)		1,447		182,525
Honeywell International, Inc.		5,261		1,079,820
Johnson Controls International PLC		22,573		1,474,468
Lockheed Martin Corp.		1,531		696,406
Masco Corp.		9,683		763,795
Parker-Hannifin Corp.		1,940		1,078,233
Uber Technologies, Inc. (a)		10,539		811,398
Union Pacific Corp.		5,470		1,345,237
United Parcel Service, Inc. Class B		6,952		1,033,276
Xylem, Inc.		7,012		906,231
				13,492,682
Information Technology — 30.8%
Accenture PLC Class A		4,409		1,528,203
Adobe, Inc. (a)		812		409,735
Advanced Micro Devices, Inc. (a)		12,849		2,319,116
Analog Devices, Inc.		7,326		1,449,009
Apple, Inc.		36,123		6,194,372
Applied Materials, Inc.		6,927		1,428,555

MML Sustainable Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
ASML Holding NV		747	$	717,182
Broadcom, Inc.		519		687,888
Cadence Design Systems, Inc. (a)		4,652		1,448,075
CDW Corp.		6,023		1,540,563
Cisco Systems, Inc.		31,914		1,592,828
Crowdstrike Holdings, Inc. Class A (a)		902		289,172
International Business Machines Corp.		7,954		1,518,896
Keysight Technologies, Inc. (a)		8,484		1,326,728
Microsoft Corp.		31,689		13,332,196
NVIDIA Corp.		8,985		8,118,487
Salesforce, Inc.		6,173		1,859,184
ServiceNow, Inc. (a)		539		410,934
Workday, Inc. Class A (a)		1,995		544,136
				46,715,259
Materials — 2.3%
Ball Corp.		11,015		741,970
Ecolab, Inc.		4,614		1,065,373
Linde PLC		3,788		1,758,844
				3,566,187
Real Estate — 2.2%
Equinix, Inc.		1,108		914,465
Prologis, Inc.		18,508		2,410,112
				3,324,577
Utilities — 1.3%
NextEra Energy, Inc.		30,570		1,953,729
TOTAL COMMON STOCK (Cost $103,237,616)				151,536,590
TOTAL EQUITIES (Cost $103,237,616)				151,536,590
EXCHANGE-TRADED FUNDS — 0.1%
SPDR S&P 500 ETF Trust		168		87,876
TOTAL EXCHANGE-TRADED FUNDS (Cost $85,989)				87,876
TOTAL LONG-TERM INVESTMENTS (Cost $103,323,605)				151,624,466
	Principal Amount
SHORT-TERM INVESTMENTS — 0.2%
Repurchase Agreement — 0.2%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (b)	$	337,452		337,452
TOTAL SHORT-TERM INVESTMENTS (Cost $337,452)				337,452

MML Sustainable Equity Fund —  Portfolio of Investments (Continued)

	Principal Amount	Value
TOTAL INVESTMENTS — 100.1% (Cost $103,661,057) (c)		$	151,961,918
Other Assets/(Liabilities) — (0.1)%			(88,990)
NET ASSETS — 100.0%		$	151,872,928

Abbreviation Legend

ETF Exchange-Traded Fund

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Non-income producing security.

(b) Maturity value of $337,512. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $344,260.

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

Forward contracts
Counterparty	Settlement Date	Currency Purchased		Currency Sold		Unrealized Appreciation (Depreciation)
Bank of America N.A.	6/28/24	EUR	14,540	USD	15,788	$	(46)
Bank of America N.A.	6/28/24	USD	212,495	EUR	195,416		931
JP Morgan Chase Bank N.A.	6/28/24	USD	212,440	EUR	195,416		876
Morgan Stanley & Co. LLC	6/28/24	USD	212,554	EUR	195,416		990
						$	2,751

Currency Legend

EUR Euro

USD U.S. Dollar

MML Total Return Bond Fund —  Portfolio of Investments

March 31, 2024 (Unaudited)

	Principal Amount		Value
BONDS & NOTES — 114.6%
BANK LOANS — 1.5%
Beverages — 0.1%
City Brewing Co. LLC, Closing Date Term Loan, 3 mo. USD Term SOFR + 3.500%
9.078% VRN 4/05/28	$	50,512	$	38,777
Naked Juice LLC
Term Loan, 3 mo. USD Term SOFR + 3.250%
8.659% VRN 1/24/29		139,601		130,305
2nd Lien Term Loan, 3 mo. USD Term SOFR + 6.000%
11.402% VRN 1/24/30		28,134		22,657
Triton Water Holdings, Inc., Term Loan, 3 mo. USD Term SOFR + 3.250%,
8.562% VRN 3/31/28		26,537		26,235
				217,974
Chemicals — 0.0%
Chemours Co., 2023 USD Term Loan B, 1 mo. USD Term SOFR + 3.500%
8.830% VRN 8/18/28		66,110		65,779
Mativ Holdings, Inc., Delayed Draw Term Loan A, 1 mo. USD Term SOFR + 2.500%,
7.930% VRN 5/06/27		17,744		17,389
				83,168
Commercial Services — 0.1%
Element Materials Technology Group U.S. Holdings Inc.
2022 USD Term Loan, 3 mo. USD Term SOFR + 4.250%
9.659% VRN 7/06/29		20,260		20,244
2022 USD Delayed Draw Term Loan, 3 mo. USD Term SOFR + 4.250%
9.659% VRN 7/06/29		9,351		9,343
Pre-Paid Legal Services, Inc., 2021 Term Loan, 1 mo. USD Term SOFR + 3.750%,
9.195% VRN 12/15/28		28,078		27,923
Prime Security Services Borrower LLC, 2023 Term Loan A, 6 mo. USD Term SOFR + 2.250%
7.503% VRN 3/14/28		24,367		24,184
Spin Holdco, Inc., 2021 Term Loan, 3 mo. USD Term SOFR + 4.000%
9.585% VRN 3/04/28		111,691		103,000
Trans Union, LLC, 2024 Term Loan B6, 1 mo. USD Term SOFR + 2.000%,
7.327% VRN 12/01/28		32,086		32,054
TruGreen Ltd. Partnership, 2020 Term Loan, 1 mo. USD Term SOFR + 4.000%,
9.430% VRN 11/02/27		23,851		23,180
				239,928

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Computers — 0.0%
Amentum Government Services Holdings LLC, Term Loan B, 1 mo. USD Term SOFR + 4.000%
9.445% VRN 1/29/27	$	28,860	$	28,896
Peraton Corp., Term Loan B, 1 mo. USD Term SOFR + 3.750%
9.180% VRN 2/01/28		95,370		95,192
				124,088
Distribution & Wholesale — 0.0%
Patriot Container Corp., 2018 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.750%,
9.177% VRN 3/20/25		13,490		13,047
Diversified Financial Services — 0.1%
Avolon TLB Borrower 1 (US) LLC, 2023 Term Loan B6, 1 mo. USD Term SOFR + 2.000%
7.329% VRN 6/22/28		58,292		58,287
Deerfield Dakota Holding LLC, 2020 USD Term Loan B, 3 mo. USD Term SOFR + 3.750%
9.059% VRN 4/09/27		58,108		57,793
Jane Street Group LLC, 2024 Term Loan B, 1 mo. USD Term SOFR + 2.500%
7.942% VRN 1/26/28		51,695		51,708
Setanta Aircraft Leasing Designated Activity Co., Term Loan B, 3 mo. USD Term SOFR + 2.000%
7.564% VRN 11/05/28		175,000		175,255
				343,043
Electronics — 0.0%
II-VI, Inc., 2022 Term Loan B, 1 mo. USD Term SOFR + 2.750%
8.195% VRN 7/02/29		80,891		80,891
Engineering & Construction — 0.0%
Artera Services LLC, 2024 Term Loan, 3 mo. USD Term SOFR + 4.500%
9.809% VRN 2/15/31		36,512		36,622
Entertainment — 0.1%
Churchill Downs, Inc., 2021 Incremental Term Loan B1, 1 mo. USD Term SOFR + 2.000%
7.430% VRN 3/17/28		49,490		49,459
PENN Entertainment, Inc., 2022 Term Loan B, 1 mo. USD Term SOFR + 2.750%
8.177% VRN 5/03/29		22,179		22,188
William Morris Endeavor Entertainment LLC, 2018 1st Lien Term Loan, 1 mo. USD Term SOFR + 2.750%
8.195% VRN 5/18/25		118,816		118,646
				190,293
Environmental Controls — 0.0%
Filtration Group Corp., 2023 USD Term Loan, 1 mo. USD Term SOFR + 4.250%
9.695% VRN 10/21/28		21,555		21,608
Food — 0.0%
8th Avenue Food & Provisions, Inc., 2018 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.750%
9.192% VRN 10/01/25		7,262		7,122

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Froneri International Ltd., 2020 USD Term Loan, 1 mo. USD Term SOFR+ 2.250%
7.680% VRN 1/29/27	$	32,227	$	32,234
H Food Holdings LLC, 2018 Term Loan B, 3 mo. USD Term SOFR + 3.688%
9.292% VRN 5/23/25 (a)		19,212		13,892
				53,248
Health Care – Products — 0.1%
Avantor Funding, Inc., 2021 Term Loan B5, 1 mo. USD Term SOFR + 2.250%
7.680% VRN 11/08/27		55,340		55,365
Bausch & Lomb Corp.
Term Loan, 1 mo. USD Term SOFR + 3.250%
8.677% VRN 5/10/27		31,349		30,942
2023 Incremental Term Loan, 1 mo. USD Term SOFR + 4.000%
9.330% VRN 9/29/28		28,054		28,002
Medline Borrower LP, USD Term Loan B, 1 mo. USD Term SOFR + 3.000%
8.441% VRN 10/23/28		81,788		81,964
				196,273
Health Care – Services — 0.0%
Star Parent, Inc., Term Loan B, 3 mo. USD Term SOFR + 4.000%
9.309% VRN 9/27/30		33,567		33,340
Home Furnishing — 0.0%
AI Aqua Merger Sub, Inc., 2021 1st Lien Term Loan B, 1 mo. USD Term SOFR + 3.750%
9.072% VRN 7/31/28		41,137		41,184
Insurance — 0.1%
Acrisure LLC, 2020 Term Loan B, 1 mo. USD LIBOR + 3.500%
8.945% VRN 2/15/27		97,710		97,501
AmWINS Group, Inc., 2021 Term Loan B, 1 mo. USD Term SOFR + 2.250%
7.695% VRN 2/19/28		172,417		172,387
Asurion LLC, 2020 Term Loan B8, 1 mo. USD Term SOFR + 3.250%
8.692% VRN 12/23/26 (a)		96,852		94,741
				364,629
Internet — 0.1%
Arches Buyer, Inc., 2021 Term Loan B, 1 mo. USD Term SOFR + 3.250%
8.680% VRN 12/06/27		24,853		24,049
Buzz Finco LLC, Term Loan B, 1 mo. USD Term SOFR + 2.750%
8.177% VRN 1/29/27		24,368		24,399
Gen Digital, Inc., 2021 Term Loan A, 1 mo. USD Term SOFR + 1.750%
7.177% VRN 9/10/27		74,876		74,579
Magnite, Inc., 2024 Term Loan B, 1 mo. USD Term SOFR + 4.500%, 6 mo. USD Term SOFR + 4.500%,
9.596% - 9.821% VRN 2/06/31		14,775		14,781
Match Group, Inc., 2020 Term Loan B, 3 mo. USD Term SOFR + 1.750%
7.233% VRN 2/13/27		10,674		10,648
MH Sub I LLC, 2023 Term Loan, 1 mo. USD Term SOFR + 4.250%,
9.580% VRN 5/03/28		17,562		17,439
Proofpoint, Inc., 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.250%,
8.695% VRN 8/31/28		4,912		4,912

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Research Now Group, Inc., 2017 1st Lien Term Loan, 3 mo. USD Term SOFR + 5.500%
11.068% VRN 12/20/24 (a)	$	28,601	$	16,901
				187,708
Machinery – Diversified — 0.0%
ASP Blade Holdings, Inc., Initial Term Loan, 3 mo. USD Term SOFR + 4.000%,
9.564% VRN 10/13/28		39,620		35,638
Media — 0.1%
CSC Holdings LLC, 2019 Term Loan B5, 1 mo. USD LIBOR + 2.500%
7.940% VRN 4/15/27		47,055		42,273
Virgin Media Bristol LLC, 2023 USD Term Loan Y, 6 mo. USD Term SOFR + 3.250%
8.790% VRN 3/31/31		150,000		147,483
				189,756
Packaging & Containers — 0.1%
Berry Global, Inc., 2023 Term Loan AA, 1 mo. USD Term SOFR + 1.750%
7.182% VRN 7/01/29		225,595		225,464
Pharmaceuticals — 0.2%
Carestream Dental Equipment, Inc., 2017 1st Lien Term Loan, 3 mo. USD LIBOR + 3.250%
5.571% VRN 9/01/24		8,487		7,319
Elanco Animal Health, Inc., Term Loan B, 1 mo. USD Term SOFR+ 1.750%
7.176% VRN 8/01/27		166,660		165,975
Gainwell Acquisition Corp., Term Loan B, 3 mo. USD Term SOFR + 4.000%
9.409% VRN 10/01/27		97,727		93,281
Grifols Worldwide Operations USA, Inc., 2019 USD Term Loan B, 3 mo. USD Term SOFR + 2.000%
7.459% VRN 11/15/27		240,733		232,818
Jazz Financing Lux SARL, USD Term Loan,
0.000% 5/05/28 (a)		121,332		121,939
Organon & Co., USD Term Loan, 1 mo. USD Term SOFR + 3.000%
8.433% VRN 6/02/28		252,592		253,330
				874,662
Private Equity — 0.0%
GTCR W Merger Sub LLC, USD Term Loan B, 1 mo. USD Term SOFR + 3.000%
8.309% VRN 1/31/31		65,208		65,384
Retail — 0.1%
1011778 BC Unlimited Liability Co., 2023 Term Loan B5, 1 mo. USD Term SOFR + 2.250%
7.580% VRN 9/20/30		43,047		43,004
KFC Holding Co., 2021 Term Loan B, 1 mo. USD Term SOFR + 1.750%
7.191% VRN 3/15/28		38,916		38,863
Michaels Cos., Inc., 2021 Term Loan B, 3 mo. USD Term SOFR + 4.250%
9.821% VRN 4/15/28		233,400		208,893
Whatabrands LLC, 2021 Term Loan B, 1 mo. USD Term SOFR + 3.250%,
8.692% VRN 8/03/28		17,791		17,790
				308,550

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Software — 0.2%
Athenahealth Group, Inc., 2022 Term Loan B, 1 mo. USD Term SOFR + 3.250%
8.580% VRN 2/15/29	$	235,058	$	232,524
Central Parent, Inc., 2023 Term Loan B, 3 mo. USD Term SOFR + 4.000%
9.309% VRN 7/06/29		35,322		35,412
EagleView Technology Corp., 2018 Add On Term Loan B, 3 mo. USD Term SOFR + 3.500%
9.065% VRN 8/14/25		81,777		79,134
Open Text Corp.
Term Loan B, 1 mo. USD Term SOFR + 1.750%
7.177% VRN 5/30/25		26,008		26,012
2023 Term Loan B, 1 mo. USD Term SOFR + 2.750%
8.177% VRN 1/31/30		50,116		50,173
Oracle Corp., Term Loan A1, 1 mo. USD Term SOFR + 1.600%
6.929% VRN 8/16/27		195,574		195,329
Renaissance Holding Corp., 2024 Term Loan, 1 mo. USD Term SOFR + 4.250%,
9.577% VRN 4/05/30		32,323		32,363
SS&C Technologies, Inc., 2018 Term Loan B5, 1 mo. USD Term SOFR + 1.750%
7.195% VRN 4/16/25		121,386		121,381
				772,328
Telecommunications — 0.1%
CCI Buyer, Inc., Term Loan, 3 mo. USD Term SOFR + 4.000%
9.302% VRN 12/17/27		29,422		29,228
Frontier Communications Corp., 2021 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.750%
9.195% VRN 10/08/27		22,665		22,573
SBA Senior Finance II LLC, 2024 Term Loan B, 1 mo. USD Term SOFR + 2.000%,
7.340% VRN 1/25/31		92,098		92,242
Zayo Group Holdings, Inc., 2022 USD Incremental Term Loan B, 1 mo. USD Term SOFR + 4.325%,
9.655% VRN 3/09/27		111,693		99,499
				243,542
Transportation — 0.0%
Genesee & Wyoming, Inc., Term Loan, 3 mo. USD Term SOFR + 2.000%
7.402% VRN 12/30/26		41,459		41,463
TOTAL BANK LOANS (Cost $5,013,328)				4,983,831
CORPORATE DEBT — 17.6%
Aerospace & Defense — 0.1%
Boeing Co.
5.805% 5/01/50		335,000		316,953
Agriculture — 0.7%
BAT Capital Corp.
4.540% 8/15/47		840,000		648,556
4.758% 9/06/49		34,000		27,060
5.650% 3/16/52		185,000		166,920
Imperial Brands Finance PLC
3.125% 7/26/24 (b)		320,000		317,216

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
3.500% 7/26/26 (b)	$	225,000	$	214,601
4.250% 7/21/25 (b)		415,000		407,401
Philip Morris International, Inc.
1.450% 8/01/39 EUR (c)		100,000		74,622
Reynolds American, Inc.
5.850% 8/15/45		315,000		292,177
				2,148,553
Airlines — 0.2%
United Airlines Pass-Through Trust, Series 2023-1, Class A,
5.800% 7/15/37		665,000		676,172
Banks — 5.3%
Bank of America Corp.
Secured Overnight Financing Rate + 0.910% 1.658% VRN 3/11/27		385,000		358,634
Secured Overnight Financing Rate + 1.370% 1.922% VRN 10/24/31		70,000		57,037
Secured Overnight Financing Rate + 1.060% 2.087% VRN 6/14/29		895,000		790,892
Secured Overnight Financing Rate + 1.220% 2.299% VRN 7/21/32		90,000		73,648
Secured Overnight Financing Rate + 1.050% 2.551% VRN 2/04/28		635,000		590,245
Secured Overnight Financing Rate + 1.210% 2.572% VRN 10/20/32		75,000		62,222
Secured Overnight Financing Rate + 2.150% 2.592% VRN 4/29/31		55,000		47,418
3 mo. USD Term SOFR + 1.302% 3.419% VRN 12/20/28		470,000		440,926
3 mo. USD Term SOFR + 1.837% 3.824% VRN 1/20/28		415,000		399,709
3 mo. USD Term SOFR + 1.332% 3.970% VRN 3/05/29		485,000		463,606
Citigroup, Inc.
Secured Overnight Financing Rate + 0.669% 0.981% VRN 5/01/25		85,000		84,628
Secured Overnight Financing Rate + 1.167% 2.561% VRN 5/01/32		105,000		87,571
Secured Overnight Financing Rate + 1.422% 2.976% VRN 11/05/30		150,000		133,242
Secured Overnight Financing Rate + 1.351% 3.057% VRN 1/25/33		95,000		80,765
3 mo. USD Term SOFR + 1.454% 4.075% VRN 4/23/29		525,000		502,629
Goldman Sachs Group, Inc.
Secured Overnight Financing Rate + 0.798% 1.431% VRN 3/09/27		280,000		259,305
Secured Overnight Financing Rate + 0.818% 1.542% VRN 9/10/27		1,400,000		1,279,259
Secured Overnight Financing Rate + 0.486% 5.836% FRN 10/21/24		530,000		530,313
HSBC Holdings PLC
Secured Overnight Financing Rate + 1.732% 2.013% VRN 9/22/28		1,185,000		1,059,503
Secured Overnight Financing Rate + 1.285% 2.206% VRN 8/17/29		105,000		92,025
JP Morgan Chase & Co.
3 mo. USD Term SOFR + 0.580% 0.969% VRN 6/23/25		1,060,000		1,047,689
Secured Overnight Financing Rate + 0.885% 1.578% VRN 4/22/27		480,000		445,015
Secured Overnight Financing Rate + 1.015% 2.069% VRN 6/01/29		1,500,000		1,330,580
3 mo. USD Term SOFR + 1.510% 2.739% VRN 10/15/30		230,000		203,682
Secured Overnight Financing Rate + 1.310% 5.012% VRN 1/23/30		125,000		124,488
Lloyds Banking Group PLC
1 yr. CMT + 0.850% 1.627% VRN 5/11/27		60,000		55,241
1 yr. CMT + 3.500% 3.870% VRN 7/09/25		220,000		218,847
Morgan Stanley
Secured Overnight Financing Rate + 0.560% 1.164% VRN 10/21/25		1,300,000		1,265,799
Secured Overnight Financing Rate + 0.879% 1.593% VRN 5/04/27		330,000		305,248
Secured Overnight Financing Rate + 1.020% 1.928% VRN 4/28/32		90,000		72,239
Secured Overnight Financing Rate + 1.178% 2.239% VRN 7/21/32		140,000		114,364
Secured Overnight Financing Rate + 1.360% 2.484% VRN 9/16/36		295,000		233,311
PNC Financial Services Group, Inc.
Secured Overnight Financing Rate + 1.933% 5.068% VRN 1/24/34		455,000		440,760
Secured Overnight Financing Rate + 1.902% 5.676% VRN 1/22/35		45,000		45,410
Secured Overnight Financing Rate Index + 2.140% 6.037% VRN 10/28/33		45,000		46,525
Secured Overnight Financing Rate + 2.284% 6.875% VRN 10/20/34		145,000		158,779

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Santander UK Group Holdings PLC
1 yr. CMT + 1.250% 1.532% VRN 8/21/26	$	710,000	$	668,771
Secured Overnight Financing Rate + 0.989% 1.673% VRN 6/14/27		120,000		109,773
Secured Overnight Financing Rate + 1.220% 2.469% VRN 1/11/28		200,000		183,794
US Bancorp
Secured Overnight Financing Rate + 1.600% 4.839% VRN 2/01/34		485,000		460,536
Secured Overnight Financing Rate + 1.860% 5.678% VRN 1/23/35		85,000		85,827
Secured Overnight Financing Rate + 2.260% 5.836% VRN 6/12/34		60,000		61,155
Secured Overnight Financing Rate + 2.090% 5.850% VRN 10/21/33		115,000		117,251
Wells Fargo & Co.
Secured Overnight Financing Rate + 2.100% 2.393% VRN 6/02/28		940,000		860,386
3 mo. USD Term SOFR + 1.432% 2.879% VRN 10/30/30		310,000		274,038
Secured Overnight Financing Rate + 1.500% 3.350% VRN 3/02/33		595,000		516,239
Secured Overnight Financing Rate + 1.510% 3.526% VRN 3/24/28		375,000		356,921
Secured Overnight Financing Rate + 2.100% 4.897% VRN 7/25/33		400,000		385,463
				17,581,708
Beverages — 0.2%
Bacardi Ltd.
4.450% 5/15/25 (b)		485,000		478,220
Triton Water Holdings, Inc.
6.250% 4/01/29 (b)		58,000		52,828
				531,048
Biotechnology — 0.0%
Amgen, Inc.
4.200% 2/22/52		145,000		119,265
Chemicals — 0.3%
International Flavors & Fragrances, Inc.
1.832% 10/15/27 (b)		70,000		62,070
2.300% 11/01/30 (b)		570,000		473,525
3.268% 11/15/40 (b)		30,000		21,362
3.468% 12/01/50 (b)		65,000		43,323
4.375% 6/01/47		65,000		50,185
5.000% 9/26/48		385,000		329,148
				979,613
Commercial Services — 0.1%
Adtalem Global Education, Inc.
5.500% 3/01/28 (b)		72,000		68,927
Global Payments, Inc.
4.875% 3/17/31 EUR (c)		100,000		113,632
Worldline SA
4.125% 9/12/28 EUR (b) (c)		200,000		212,594
				395,153
Diversified Financial Services — 0.8%
AerCap Ireland Capital DAC/AerCap Global Aviation Trust
3.300% 1/30/32		420,000		360,216
3.500% 1/15/25		1,000,000		982,972
Air Lease Corp.
5.850% 12/15/27		355,000		360,476
Avolon Holdings Funding Ltd.
2.528% 11/18/27 (b)		389,000		345,973
2.875% 2/15/25 (b)		335,000		325,974
3.950% 7/01/24 (b)		130,000		129,247

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
GGAM Finance Ltd.
8.000% 2/15/27 (b)	$	100,000	$	103,252
				2,608,110
Electric — 1.6%
Arizona Public Service Co.
6.350% 12/15/32		675,000		720,377
Duke Energy Carolinas LLC
4.000% 9/30/42		1,000,000		832,159
Duke Energy Florida LLC
5.875% 11/15/33		70,000		73,962
Florida Power & Light Co.
3.990% 3/01/49		495,000		407,193
Jersey Central Power & Light Co.
4.700% 4/01/24 (b)		800,000		800,000
6.400% 5/15/36		425,000		444,887
MidAmerican Energy Co.
4.800% 9/15/43		1,400,000		1,316,595
Southwestern Electric Power Co.
3.250% 11/01/51		170,000		112,853
TenneT Holding BV
2.750% 5/17/42 EUR (b) (c)		190,000		191,400
4.500% 10/28/34 EUR (b) (c)		245,000		289,372
4.750% 10/28/42 EUR (b) (c)		100,000		123,453
				5,312,251
Electronics — 0.0%
Honeywell International, Inc.
3.750% 3/01/36 EUR (c)		145,000		157,894
Engineering & Construction — 0.0%
Artera Services LLC
8.500% 2/15/31 (b)		75,000		76,893
Entertainment — 0.5%
Warnermedia Holdings, Inc.
4.279% 3/15/32		190,000		169,715
5.050% 3/15/42		905,000		777,841
5.141% 3/15/52		910,000		755,298
				1,702,854
Environmental Controls — 0.0%
Waste Pro USA, Inc.
5.500% 2/15/26 (b)		75,000		73,866
Food — 0.8%
ELO SACA
6.000% 3/22/29 EUR (b) (c)		200,000		218,271
JBS USA LUX SA/JBS USA Food Co./JBS Luxembourg SARL
6.750% 3/15/34 (b)		640,000		672,462
JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc.
4.375% 2/02/52		135,000		98,037
6.500% 12/01/52		415,000		410,062
Pilgrim's Pride Corp.
3.500% 3/01/32 (b)		403,000		341,551
6.250% 7/01/33		365,000		372,989

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Smithfield Foods, Inc.
2.625% 9/13/31 (b)	$	635,000	$	497,281
				2,610,653
Gas — 0.3%
KeySpan Gas East Corp.
5.994% 3/06/33 (b)		630,000		638,460
National Gas Transmission PLC
4.250% 4/05/30 EUR (b) (c)		100,000		110,863
Piedmont Natural Gas Co., Inc.
5.400% 6/15/33		155,000		156,305
				905,628
Health Care – Products — 0.0%
Medtronic Global Holdings SCA
3.375% 10/15/34 EUR (c)		100,000		108,112
Health Care – Services — 0.6%
Centene Corp.
3.000% 10/15/30		453,000		388,401
CommonSpirit Health
2.782% 10/01/30		290,000		251,538
Fortrea Holdings, Inc.
7.500% 7/01/30 (b)		50,000		51,614
Fresenius Medical Care US Finance III, Inc.
1.875% 12/01/26 (b)		340,000		307,617
HCA, Inc.
3.500% 7/15/51		182,000		125,724
Kedrion SpA
6.500% 9/01/29 (b)		220,000		199,980
ModivCare Escrow Issuer, Inc.
5.000% 10/01/29 (b) (d)		302,000		218,978
Universal Health Services, Inc.
1.650% 9/01/26		385,000		350,897
				1,894,749
Household Products & Wares — 0.1%
Central Garden & Pet Co.
5.125% 2/01/28		123,000		119,248
Spectrum Brands, Inc.
3.875% 3/15/31 (b) (d)		105,000		101,143
				220,391
Insurance — 0.7%
Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer
6.750% 10/15/27 (b)		35,000		34,483
Athene Global Funding
1.985% 8/19/28 (b)		555,000		479,256
3.205% 3/08/27 (b)		135,000		126,092
Secured Overnight Financing Rate Index + 0.700% 6.057% FRN 5/24/24 (b)		505,000		505,262
Farmers Exchange Capital III 3 mo. USD LIBOR + 3.454%
5.454% VRN 10/15/54 (b)		970,000		799,962
Teachers Insurance & Annuity Association of America
3.300% 5/15/50 (b)		225,000		157,674
4.270% 5/15/47 (b)		130,000		107,759

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Willis North America, Inc.
2.950% 9/15/29	$	290,000	$	259,849
				2,470,337
Internet — 0.0%
Northwest Fiber LLC/Northwest Fiber Finance Sub, Inc.
4.750% 4/30/27 (b)		62,000		63,400
6.000% 2/15/28 (b)		89,000		91,617
				155,017
Machinery – Diversified — 0.0%
OT Merger Corp.
7.875% 10/15/29 (b)		90,000		64,265
Media — 0.9%
Cable One, Inc.
4.000% 11/15/30 (b) (d)		75,000		58,532
Charter Communications Operating LLC/Charter Communications Operating Capital
3.700% 4/01/51		560,000		346,332
3.750% 2/15/28		92,000		85,338
4.800% 3/01/50		330,000		244,270
4.908% 7/23/25		205,000		202,505
5.250% 4/01/53		265,000		209,871
5.375% 5/01/47		95,000		76,548
5.750% 4/01/48		280,000		235,789
CSC Holdings LLC
5.750% 1/15/30 (b)		53,000		28,057
6.500% 2/01/29 (b)		542,000		459,242
7.500% 4/01/28 (b)		32,000		21,570
11.750% 1/31/29 (b)		10,000		10,015
Time Warner Cable LLC
5.500% 9/01/41		535,000		445,357
5.875% 11/15/40		170,000		147,257
VZ Secured Financing BV
5.000% 1/15/32 (b)		420,000		360,613
				2,931,296
Oil & Gas — 0.2%
KazMunayGas National Co. JSC
4.750% 4/19/27 (b)		200,000		194,740
Pertamina Persero PT
3.100% 8/27/30 (b)		200,000		176,446
Petroleos Mexicanos
5.950% 1/28/31		50,000		40,100
6.625% 6/15/35		300,000		227,588
Shell International Finance BV
3.750% 9/12/46		25,000		20,187
				659,061
Packaging & Containers — 0.6%
Amcor Finance USA, Inc.
3.625% 4/28/26		650,000		626,907
Ardagh Packaging Finance PLC/Ardagh Holdings USA, Inc.
4.125% 8/15/26 (b) (d)		55,000		49,759
5.250% 8/15/27 (b) (d)		70,000		44,100
5.250% 8/15/27 (b)		295,000		185,850

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Berry Global, Inc.
1.570% 1/15/26	$	394,000	$	368,306
1.650% 1/15/27		12,000		10,894
4.875% 7/15/26 (b)		330,000		323,403
Trivium Packaging Finance BV
5.500% 8/15/26 (b)		320,000		315,513
				1,924,732
Pharmaceuticals — 0.7%
1375209 BC Ltd.
9.000% 1/30/28 (b) (d)		215,000		210,701
Bayer US Finance II LLC
4.375% 12/15/28 (b)		893,000		840,521
4.625% 6/25/38 (b)		795,000		664,295
4.875% 6/25/48 (b)		210,000		168,769
Cigna Group
3.400% 3/15/51		250,000		178,348
Grifols SA
3.200% 5/01/25 EUR (b) (c)		100,000		99,266
3.875% 10/15/28 EUR (b) (c)		200,000		170,139
				2,332,039
Pipelines — 0.5%
Energy Transfer LP
4.950% 6/15/28		125,000		123,996
5.000% 5/15/50		220,000		193,021
5.150% 3/15/45		335,000		304,392
Galaxy Pipeline Assets Bidco Ltd.
2.160% 3/31/34 (b)		169,888		146,046
Rockies Express Pipeline LLC
4.800% 5/15/30 (b)		250,000		231,093
TransCanada PipeLines Ltd.
4.625% 3/01/34		35,000		33,041
TransMontaigne Partners LP/TLP Finance Corp.
6.125% 2/15/26		181,000		171,498
Venture Global Calcasieu Pass LLC
3.875% 8/15/29 (b)		270,000		243,040
Venture Global LNG, Inc.
9.500% 2/01/29 (b)		153,000		164,913
				1,611,040
Real Estate — 0.3%
Annington Funding PLC
3.184% 7/12/29 GBP (b) (c)		200,000		226,337
3.685% 7/12/34 GBP (b) (c)		100,000		107,133
Blackstone Property Partners Europe Holdings SARL
1.625% 4/20/30 EUR (b) (c)		200,000		179,564
1.750% 3/12/29 EUR (b) (c)		200,000		187,253
Vonovia SE
0.750% 9/01/32 EUR (b) (c)		100,000		81,740
2.250% 4/07/30 EUR (b) (c)		100,000		97,716
				879,743
Real Estate Investment Trusts (REITS) — 1.6%
American Homes 4 Rent LP
3.375% 7/15/51		205,000		136,491

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
American Tower Corp.
1.000% 1/15/32 EUR (c)	$	100,000	$	88,062
2.300% 9/15/31		356,000		290,561
2.700% 4/15/31		80,000		67,725
CapitaLand Ascendas REIT
0.750% 6/23/28 EUR (b) (c)		185,000		171,650
Digital Intrepid Holding BV
0.625% 7/15/31 EUR (b) (c)		425,000		358,359
DOC DR LLC
2.625% 11/01/31		190,000		156,517
4.300% 3/15/27		45,000		43,951
Extra Space Storage LP
2.350% 3/15/32		215,000		172,025
2.400% 10/15/31		76,000		62,527
2.550% 6/01/31		130,000		107,920
GLP Capital LP/GLP Financing II, Inc.
3.250% 1/15/32		37,000		31,148
4.000% 1/15/30		642,000		586,119
4.000% 1/15/31		75,000		66,924
Healthcare Realty Holdings LP
2.000% 3/15/31		200,000		158,978
2.050% 3/15/31		67,000		51,665
2.400% 3/15/30		195,000		159,625
3.100% 2/15/30		190,000		165,432
3.625% 1/15/28		45,000		41,553
Hudson Pacific Properties LP
3.250% 1/15/30		386,000		297,322
3.950% 11/01/27		68,000		60,244
4.650% 4/01/29 (d)		135,000		115,008
Invitation Homes Operating Partnership LP
2.000% 8/15/31		405,000		321,809
4.150% 4/15/32		40,000		36,607
5.500% 8/15/33		65,000		64,750
LXP Industrial Trust
2.375% 10/01/31		430,000		343,225
Prologis Euro Finance LLC
4.250% 1/31/43 EUR (c)		310,000		336,869
Realty Income Corp.
5.125% 7/06/34 EUR (c)		270,000		317,799
Rexford Industrial Realty LP
2.150% 9/01/31		5,000		4,004
VICI Properties LP
4.950% 2/15/30		60,000		58,023
5.125% 5/15/32		306,000		292,688
VICI Properties LP/VICI Note Co., Inc.
3.875% 2/15/29 (b)		90,000		82,833
4.125% 8/15/30 (b)		19,000		17,277
4.500% 1/15/28 (b)		58,000		55,568
4.625% 6/15/25 (b)		15,000		14,770
				5,336,028
Retail — 0.1%
Ferrellgas LP/Ferrellgas Finance Corp.
5.875% 4/01/29 (b) (d)		60,000		57,139
Michaels Cos., Inc.
5.250% 5/01/28 (b) (d)		170,000		144,853
				201,992

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Savings & Loans — 0.1%
Nationwide Building Society Secured Overnight Financing Rate + 1.290%
2.972% VRN 2/16/28 (b)	$	340,000	$	317,123
Software — 0.0%
Open Text Corp.
6.900% 12/01/27 (b)		50,000		51,700
Telecommunications — 0.2%
Frontier Communications Holdings LLC
8.625% 3/15/31 (b) (d)		226,000		230,820
Sprint Spectrum Co. LLC/Sprint Spectrum Co. II LLC/Sprint Spectrum Co. III LLC
4.738% 9/20/29 (b)		173,750		172,792
T-Mobile USA, Inc.
3.750% 4/15/27		375,000		361,165
				764,777
Water — 0.1%
Thames Water Utilities Finance PLC
4.375% 1/18/31 EUR (b) (c)		160,000		159,854
TOTAL CORPORATE DEBT (Cost $62,078,885)				58,278,870
MUNICIPAL OBLIGATIONS — 0.8%
California — 0.1%
California State University, Revenue Bonds, Series B
2.374% 11/01/35		5,000		3,926
University of California, Revenue Bonds, Series BI
2.247% 5/15/34		290,000		231,747
				235,673
New Jersey — 0.2%
Jersey City Municipal Utilities Authority, NJ, Revenue Bonds, Series B
5.470% 5/15/27		520,000		526,364
New York — 0.5%
City of New York, NY, General Obligation, Series G1
5.968% 3/01/36		500,000		528,003
New York City Transitional Finance Authority, NY, Future Tax Secured Revenue, Revenue Bonds, Series G3
2.450% 11/01/34		560,000		445,254
New York State Dormitory Authority, Revenue Bonds, Series H
5.289% 3/15/33		750,000		754,475
				1,727,732
TOTAL MUNICIPAL OBLIGATIONS (Cost $2,793,604)				2,489,769
NON-U.S. GOVERNMENT AGENCY OBLIGATIONS — 16.8%
Commercial Mortgage-Backed Securities — 3.4%
BAMLL Commercial Mortgage Securities Trust, Series 2018-PARK, Class A,
4.091% VRN 8/10/38 (b) (e)		620,000		574,731
BX Commercial Mortgage Trust
Series 2020-VIV4, Class A, 2.843% 3/09/44 (b)		1,160,000		1,005,163

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Series 2020-VIVA, Class D, 3.549% VRN 3/11/44 (b) (e)	$	780,000	$	668,312
Series 2022-CSMO, Class A, 1 mo. USD Term SOFR + 2.115% 7.440% FRN 6/15/27 (b)		692,000		694,595
BX Trust
Series 2019-OC11, Class A, 3.202% 12/09/41 (b)		180,000		160,397
Series 2019-OC11, Class E, 3.944% VRN 12/09/41 (b) (e)		300,000		257,486
Series 2022-VAMF, Class C, 1 mo. USD Term SOFR + 1.580% 6.905% FRN 1/15/39 (b)		443,000		436,910
BXSC Commercial Mortgage Trust, Series 2022-WSS, Class D, 1 mo. USD Term SOFR + 3.188%
8.514% FRN 3/15/35 (b)		894,000		887,295
Century Plaza Towers, Series 2019-CPT, Class A
2.865% 11/13/39 (b)		355,000		303,569
Credit Suisse Mortgage Capital Certificates, Series 2019-ICE4, Class F, 1 mo. USD Term SOFR + 2.697%
8.023% FRN 5/15/36 (b)		897,766		894,535
DC Office Trust, Series 2019-MTC, Class A
2.965% 9/15/45 (b)		375,000		319,305
Grace Trust, Series 2020-GRCE, Class A
2.347% 12/10/40 (b)		900,000		729,128
Hudson Yards Mortgage Trust
Series 2019-55HY, Class A, 2.943% VRN 12/10/41 (b) (e)		375,000		329,239
Series 2019-30HY, Class A, 3.228% 7/10/39 (b)		385,000		344,910
JP Morgan Chase Commercial Mortgage Securities Trust, Series 2019-OSB, Class A
3.397% 6/05/39 (b)		385,000		347,336
MKT Mortgage Trust, Series 2020-525M, Class A
2.694% 2/12/40 (b)		255,000		206,511
One Bryant Park Trust, Series 2019-OBP, Class A
2.516% 9/15/54 (b)		490,000		419,287
SFAVE Commercial Mortgage Securities Trust, Series 2015-5AVE, Class A1,
3.872% VRN 1/05/43 (b) (e)		655,000		488,873
SMRT Commercial Mortgage Trust, Series 2022-MINI, Class F, 1 mo. USD Term SOFR + 3.350%
8.676% FRN 1/15/39 (b)		630,000		598,336
Stack Infrastructure Issuer LLC, Series 2024-1A, Class A2
5.900% 3/25/49 (b)		820,000		822,374
Vantage Data Centers Issuer LLC, Series 2020-1A, Class A2
1.645% 9/15/45 (b)		444,000		415,688
Wells Fargo Commercial Mortgage Trust, Series 2019-JWDR, Class E,
3.860% VRN 9/15/31 (b) (e)		281,000		259,311
				11,163,291
Home Equity Asset-Backed Securities — 2.2%
Aegis Asset-Backed Securities Trust Mortgage Pass-Through Certificates, Series 2005-4, Class M2, 1 mo. USD Term SOFR + 0.819%
6.149% FRN 10/25/35		670,109		600,362
Countrywide Asset-Backed Certificates Trust, Series 2004-7, Class MF2,
4.155% VRN 10/25/34 (e)		1,532,190		1,437,087
GSAMP Trust, Series 2005-HE5, Class M3, 1 mo. USD Term SOFR + 0.804%
6.134% FRN 11/25/35		178,085		175,168
JP Morgan Mortgage Acquisition Trust, Series 2007-HE1, Class AF4,
4.286% STEP 3/25/47		2,561,837		1,642,762
Long Beach Mortgage Loan Trust, Series 2006-9, Class 2A2, 1 mo. USD Term SOFR + 0.334%
5.664% FRN 10/25/36		5,841,840		1,813,819

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Morgan Stanley Capital I, Inc. Trust, Series 2006-HE1, Class A4, 1 mo. USD Term SOFR + 0.694%
6.024% FRN 1/25/36	$	757,565	$	705,934
Saxon Asset Securities Trust, Series 2007-2, Class A2C, 1 mo. USD Term SOFR + 0.354%
5.684% FRN 5/25/47		1,460,795		987,529
				7,362,661
Other Asset-Backed Securities — 3.9%
AIMCO CLO, Series 2015-AA, Class BR2, 3 mo. USD Term SOFR + 1.862%
7.178% FRN 10/17/34 (b)		1,100,000		1,100,046
AIMCO CLO 11 Ltd., Series 2020-11A, Class AR, 3 mo. USD Term SOFR + 1.392%
6.708% FRN 10/17/34 (b)		750,000		749,485
Allegro CLO XII Ltd., Series 2020-1A, Class A1, 3 mo. USD Term SOFR + 1.512%
6.829% FRN 1/21/32 (b)		850,000		850,421
BlueMountain CLO Ltd., Series 2018-3A, Class BR, 3 mo. USD Term SOFR + 1.850%
7.175% FRN 10/25/30 (b)		800,000		800,018
Dryden XXVI Senior Loan Fund, Series 2013-26A, Class AR, 3 mo. USD Term SOFR + 1.162%
6.476% FRN 4/15/29 (b)		665,337		665,410
Eaton Vance CLO Ltd., Series 2020-1A, Class AR, 3 mo. USD Term SOFR + 1.432%
6.746% FRN 10/15/34 (b)		990,000		990,246
FirstKey Homes Trust, Series 2020-SFR2, Class E
2.668% 10/19/37 (b)		390,000		367,977
Flatiron CLO 21 Ltd., Series 2021-1A, Class B, 3 mo. USD Term SOFR + 1.862%
7.171% FRN 7/19/34 (b)		850,000		850,160
HPS Loan Management Ltd., Series 2021-16A, Class A1, 3 mo. USD Term SOFR + 1.402%
6.717% FRN 1/23/35 (b)		1,000,000		1,000,751
Madison Park Funding XXIX Ltd., Series 2018-29A, Class AR, 3 mo. USD Term SOFR + 1.180%
6.489% FRN 10/18/30 (b) (f)		825,000		825,148
Magnetite XII Ltd., Series 2015-12A, Class AR4, 3 mo. USD Term SOFR + 1.150%
6.472% FRN 10/15/31 (b)		800,000		800,142
Progress Residential Trust
Series 2020-SFR3, Class E, 2.296% 10/17/27 (b)		590,000		554,095
Series 2020-SFR3, Class F, 2.796% 10/17/27 (b)		360,000		338,140
Series 2021-SFR2, Class F, 3.395% 4/19/38 (b)		1,150,000		1,052,161
Series 2021-SFR10, Class F, 4.608% 12/17/40 (b)		1,236,731		1,093,773
Rockford Tower CLO Ltd., Series 2021-1A, Class A1, 3 mo. USD Term SOFR + 1.432%
6.749% FRN 7/20/34 (b)		850,000		850,195
				12,888,168
Student Loans Asset-Backed Securities — 1.3%
Access Group, Inc., Series 2015-1, Class A, 30 day USD SOFR Average + 0.814%
6.135% FRN 7/25/56 (b)		246,266		237,253
Collegiate Funding Services Education Loan Trust, Series 2005-A, Class A4, 90 day USD SOFR Average + 0.462%
5.814% FRN 3/28/35		858,534		814,138

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
SLM Student Loan Trust
Series 2007-7, Class A4, 90 day USD SOFR Average + 0.592% 5.953% FRN 1/25/22	$	382,709	$	373,348
Series 2012-7, Class A3, 30 day USD SOFR Average + 0.764% 6.085% FRN 5/26/26		485,787		467,506
Series 2012-2, Class A, 30 day USD SOFR Average + 0.814% 6.135% FRN 1/25/29		560,827		524,314
Series 2012-1, Class A3, 30 day USD SOFR Average + 1.064% 6.385% FRN 9/25/28		459,178		443,780
Series 2008-6, Class A4, 90 day USD SOFR Average + 1.362% 6.723% FRN 7/25/23		639,579		634,533
Series 2008-5, Class B, 90 day USD SOFR Average + 2.112% 7.473% FRN 7/25/73		700,000		695,676
				4,190,548
Whole Loan Collateral Collateralized Mortgage Obligations — 6.0%
American Home Mortgage Investment Trust, Series 2005-1, Class 6A, 6 mo. USD Term SOFR + 2.428%
7.681% FRN 6/25/45		182,540		179,063
Angel Oak Mortgage Trust
Series 2021-7, Class A1, 1.978% VRN 10/25/66 (b) (e)		198,702		165,617
Series 2022-6,Class A1, 4.300% STEP 7/25/67 (b)		791,429		764,639
Chase Mortgage Finance Trust, Series 2007-A1, Class 11A4,
4.345% VRN 3/25/37 (e)		197,993		182,541
Citigroup Mortgage Loan Trust, Series 2005-11, Class A2A, 1 yr. CMT + 2.400%
7.780% FRN 10/25/35		147,275		145,747
COLT Mortgage Loan Trust, Series 2021-6, Class A1,
1.907% VRN 12/25/66 (b) (e)		653,748		566,579
Countrywide Alternative Loan Trust
Series 2006-OA6, Class 1A2, 1 mo. USD Term SOFR + 0.534% 5.864% FRN 7/25/46		744,482		660,080
Series 2005-31, Class 2A1, 1 mo. USD Term SOFR + 0.714% 6.044% FRN 8/25/35		719,026		656,898
Credit Suisse Mortgage Trust, Series 2018-RPL9, Class A,
3.850% VRN 9/25/57 (b) (e)		698,459		662,081
Deephaven Residential Mortgage Trust, Series 2021-4, Class A1,
1.931% VRN 11/25/66 (b) (e)		1,323,523		1,131,400
Deutsche Alt-A Securities, Inc. Mortgage Loan Trust, Series 2005-1, Class 1A3, 1 mo. USD Term SOFR + 0.614%
5.944% FRN 2/25/35		1,135,052		1,104,991
First Franklin Mortgage Loan Trust, Series 2006-FFH1, Class M1, 1 mo. USD Term SOFR + 0.669%
5.999% FRN 1/25/36		605,510		580,857
First Horizon Mortgage Pass-Through Trust, Series 2005-AR5, Class 2A1,
5.754% VRN 11/25/35 (e)		173,182		136,384
GS Mortgage-Backed Securities Corp. Trust, Series 2021-RPL1, Class A1,
1.750% VRN 12/25/60 (b) (e)		1,405,268		1,277,890
GS Mortgage-Backed Securities Trust
Series 2022-PJ6, Class A4, 3.000% VRN 1/25/53 (b) (e)		1,839,833		1,541,723
Series 2018-RPL1, Class A1A, 3.750% 10/25/57 (b)		526,300		504,781
HarborView Mortgage Loan Trust, Series 2006-10, Class 1A1A, 1 mo. USD Term SOFR + 0.514%
5.834% FRN 11/19/36		1,497,576		1,147,575
Impac CMB Trust, Series 2005-1, Class 1A1, 1 mo. USD Term SOFR + 0.634%
5.964% FRN 4/25/35		971,426		908,479
IndyMac Index Mortgage Loan Trust

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
IndyMac Index Mortgage Loan Trust
Series 2005-AR19, Class A1, 3.709% VRN 10/25/35 (e)	$	613,899	$	465,031
Series 2006-AR27, Class 1A3, 1 mo. USD Term SOFR + 0.654% 5.984% FRN 10/25/36		1,181,036		510,967
JP Morgan Mortgage Trust, Series 2021-13, Class A3,
2.500% VRN 4/25/52 (b) (e)		1,585,445		1,275,540
MASTR Adjustable Rate Mortgages Trust, Series 2007-1, Class I2A3, 1 yr. MTA + 0.740%
5.829% FRN 1/25/47		142,683		141,173
Nomura Asset Acceptance Corp. Alternative Loan Trust, Series 2005-AR1, Class M1, 1 mo. USD Term SOFR + 1.184%
6.514% FRN 2/25/35		449,885		435,238
Opteum Mortgage Acceptance Corp. Asset-Backed Pass-Through Certificates, Series 2005-4 , Class M2, 1 mo. USD Term SOFR + 0.864%
6.194% FRN 11/25/35		1,450,000		1,388,846
Structured Asset Mortgage Investments II Trust, Series 2006-AR8, Class A2, 1 mo. USD Term SOFR + 0.534%
5.864% FRN 10/25/36		1,523,611		1,308,474
Washington Mutual Mortgage Pass-Through Certificates Trust
Series 2006-1 Class 3A2, 5.750% 2/25/36		416,898		369,105
Series 2005-AR15, Class A1A1, 1 mo. USD Term SOFR + 0.634% 5.964% FRN 11/25/45		1,481,219		1,350,270
Series 2005-AR13, Class A1A1, 1 mo. USD Term SOFR + 0.694% 6.024% FRN 10/25/45		264,939		250,442
Series 2005-AR2, Class 2A21, 1 mo. USD Term SOFR + 0.774% 6.104% FRN 1/25/45		224,027		216,955
				20,029,366
TOTAL NON-U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $57,531,338)				55,634,034
SOVEREIGN DEBT OBLIGATIONS — 0.6%
Brazilian Government International Bond
6.125% 3/15/34		200,000		197,792
Colombia Government International Bond
3.125% 4/15/31		200,000		159,584
Dominican Republic International Bond
4.500% 1/30/30 (b)		200,000		181,985
Hungary Government International Bond
2.125% 9/22/31 (b)		200,000		158,400
Mexico Government International Bond
4.875% 5/19/33		300,000		284,063
Panama Government International Bond
3.160% 1/23/30		200,000		166,002
Paraguay Government International Bond
4.950% 4/28/31 (b)		200,000		192,779
Perusahaan Penerbit SBSN Indonesia III
2.550% 6/09/31 (b)		200,000		170,978
Peruvian Government International Bond
2.783% 1/23/31		200,000		171,813
Republic of Poland Government International Bond
4.875% 10/04/33		100,000		98,381
Republic of South Africa Government International Bond
5.875% 4/20/32		250,000		225,000

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Romania Government International Bond
3.000% 2/14/31 (b)	$	110,000	$	92,215
				2,098,992
TOTAL SOVEREIGN DEBT OBLIGATIONS (Cost $2,258,394)				2,098,992
U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES (g) — 38.0%
Collateralized Mortgage Obligations — 0.8%
Federal Home Loan Mortgage Corp. REMICS
Series 4818, Class CA, 3.000% 4/15/48		132,036		114,590
Series 4639, Class HZ, 3.250% STEP 4/15/53		1,680,380		1,339,405
Series 4846, Class PA, 4.000% 6/15/47		37,659		37,056
Federal National Mortgage Association REMICS
Series 2018-43, Class CT, 3.000% 6/25/48		232,114		201,464
Series 2018-57, Class QA, 3.500% 5/25/46		42,576		41,841
Government National Mortgage Association REMICS
Series 2018-124, Class NW, 3.500% 9/20/48		225,496		201,330
Series 2019-15, Class GT, 3.500% 2/20/49		140,203		125,013
Series 2024-30, Class AF, 30 day USD SOFR Average + 1.250% 6.500% FRN 2/20/54		499,368		500,705
				2,561,404
Pass-Through Securities — 36.9%
Federal Home Loan Mortgage Corp.
Pool #SD8199 2.000% 3/01/52 (f)		1,224,502		969,725
Pool #QE0312 2.000% 4/01/52		1,138,608		901,702
Pool #RA4179 2.500% 12/01/50		1,557,567		1,287,553
Pool #RA6815 2.500% 2/01/52		2,063,374		1,724,376
Pool #SD8194 2.500% 2/01/52		1,514,225		1,253,145
Pool #SD8205 2.500% 4/01/52		1,639,710		1,355,969
Pool #SD8212 2.500% 5/01/52		1,596,852		1,320,527
Pool #G18592 3.000% 3/01/31		128,660		122,616
Pool #G18627 3.000% 1/01/32		429,958		408,670
Pool #G08710 3.000% 6/01/46		89,000		78,684
Pool #ZM1779 3.000% 9/01/46		451,878		398,980
Pool #G08726 3.000% 10/01/46		669,189		590,994
Pool #G08732 3.000% 11/01/46		244,321		215,772
Pool #G08741 3.000% 1/01/47		675,118		596,230
Pool #QD8259 3.000% 3/01/52		1,803,963		1,557,837
Pool #G07848 3.500% 4/01/44		1,056,703		979,809
Pool #G60023 3.500% 4/01/45		972,075		897,664
Pool #G08711 3.500% 6/01/46		290,468		266,055
Pool #G67700 3.500% 8/01/46		486,562		447,340
Pool #G08716 3.500% 8/01/46		407,917		373,632
Pool #G08722 3.500% 9/01/46		72,116		66,054
Pool #G08742 3.500% 1/01/47		333,381		305,152
Pool #G08757 3.500% 4/01/47		84,998		77,721
Pool #ZA5103 3.500% 12/01/47		3,234		2,943
Pool #G67707 3.500% 1/01/48		1,762,969		1,624,159
Pool #G08800 3.500% 2/01/48		29,731		27,083
Pool #G08816 3.500% 6/01/48		237,138		215,947
Pool #G61556 3.500% 8/01/48		405,545		371,079
Pool #G60344 4.000% 12/01/45		521,588		495,335
Pool #G67711 4.000% 3/01/48		570,847		540,866
Pool #G67713 4.000% 6/01/48		2,375		2,245

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Pool #RA7921 4.000% 9/01/52	$	1,632,540	$	1,517,171
Pool #SD8244 4.000% 9/01/52		1,747,158		1,618,775
Pool #G08843 4.500% 10/01/48		109,525		105,889
Pool #SD2322 4.500% 9/01/52		498,567		474,856
Pool #SD8275 4.500% 12/01/52 (f)		2,227,190		2,121,268
Pool #SD2730 4.500% 4/01/53		1,483,809		1,413,241
Pool #G08833 5.000% 7/01/48		72,820		72,363
Pool #G08844 5.000% 10/01/48		65,758		65,345
Federal National Mortgage Association
Pool #MA4176 2.000% 11/01/40		1,168,631		984,640
Pool #MA4333 2.000% 5/01/41		174,087		146,026
Pool #MA4158 2.000% 10/01/50		963,889		767,554
Pool #MA4492 2.000% 12/01/51		1,649,711		1,307,493
Pool #BQ6913 2.000% 12/01/51		2,153,244		1,706,572
Pool #BQ7006 2.000% 1/01/52		3,402,637		2,696,790
Pool #CB2802 2.000% 2/01/52		1,111,476		884,731
Pool #MA4562 2.000% 3/01/52		4,058,874		3,214,360
Pool #FS1598 2.000% 4/01/52		1,547,756		1,225,721
Pool #BL6060 2.455% 4/01/40		570,000		413,074
Pool #MA4512 2.500% 1/01/52		1,604,303		1,327,191
Pool #MA4548 2.500% 2/01/52		1,535,092		1,270,414
Pool #MA4563 2.500% 3/01/52		1,568,627		1,297,186
Pool #MA1607 3.000% 10/01/33		239,884		225,971
Pool #MA3811 3.000% 10/01/49		196,894		168,985
Pool #CB2430 3.000% 12/01/51		2,726,681		2,346,994
Pool #BV8477 3.000% 5/01/52		545,470		470,090
Pool #AB4262 3.500% 1/01/32		198,211		190,303
Pool #MA1512 3.500% 7/01/33		102,718		98,267
Pool #MA1148 3.500% 8/01/42		603,882		554,665
Pool #CA0996 3.500% 1/01/48		115,998		105,969
Pool #MA3305 3.500% 3/01/48		22,743		20,691
Pool #BL1132 3.730% 1/01/29		920,000		871,488
Pool #MA1146 4.000% 8/01/42		249,154		237,020
Pool #AS9830 4.000% 6/01/47		114,597		107,976
Pool #MA3027 4.000% 6/01/47		172,233		162,281
Pool #AS9972 4.000% 7/01/47		104,026		98,016
Pool #931504 4.500% 7/01/39		35,175		34,450
Pool #CA1711 4.500% 5/01/48		124,532		120,478
Pool #CA1710 4.500% 5/01/48		382,727		370,266
Pool #CA2208 4.500% 8/01/48		218,421		211,105
Pool #MA4733 4.500% 9/01/52		404,562		385,322
Pool #BW9897 4.500% 10/01/52		708,017		674,301
Pool #FS4701 4.500% 4/01/53		1,703,101		1,621,572
Pool #AD6374 5.000% 5/01/40		7,429		7,486
Pool #AI2733 5.000% 5/01/41		80,158		80,724
Pool #977014 5.500% 5/01/38		8,073		8,278
Pool #985524 5.500% 6/01/38		12,257		12,598
Pool #988578 5.500% 8/01/38		87,648		89,961
Pool #995482 5.500% 1/01/39		48,881		50,204
Government National Mortgage Association II
Pool #MA4126 3.000% 12/20/46		524,329		469,737
Pool #MA4718 3.000% 9/20/47		56,752		50,772
Pool #MA4836 3.000% 11/20/47		199,328		178,325
Pool #MA6209 3.000% 10/20/49		170,296		147,243
Pool #MA3521 3.500% 3/20/46		202,715		187,502
Pool #MA3597 3.500% 4/20/46		63,109		58,373
Pool #MA3663 3.500% 5/20/46		92,293		85,280
Pool #MA3937 3.500% 9/20/46		75,884		70,047

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
Pool #MA4127 3.500% 12/20/46	$	278,105	$	256,451
Pool #MA4262 3.500% 2/20/47		281,678		259,747
Pool #MA4382 3.500% 4/20/47		72,016		66,341
Pool #MA4719 3.500% 9/20/47		88,598		81,478
Pool #MA4837 3.500% 11/20/47		183,341		168,608
Pool #MA4900 3.500% 12/20/47		660,694		607,600
Pool #MA4653 4.000% 8/20/47		34,995		33,146
Pool #MA4838 4.000% 11/20/47		145,493		137,625
Pool #MA4901 4.000% 12/20/47		63,824		60,372
Pool #MA5078 4.000% 3/20/48		215,784		204,114
Pool #MA5466 4.000% 9/20/48		241,112		227,921
Pool #MA5399 4.500% 8/20/48		437,748		425,680
Pool #MA3666 5.000% 5/20/46		74,554		74,750
Pool #MA4199 5.000% 1/20/47		76,605		76,723
Pool #MA4454 5.000% 5/20/47		116,719		117,441
Pool #MA4722 5.000% 9/20/47		128,651		129,246
Government National Mortgage Association II, TBA
2.500% 4/20/54 (f)		5,225,000		4,449,979
4.500% 4/20/54 (f)		5,175,000		4,972,185
5.000% 4/20/54 (f)		4,400,000		4,325,027
5.500% 5/20/54 (f)		2,450,000		2,447,314
Uniform Mortgage-Backed Security, TBA
2.000% 4/01/54 (f)		7,375,000		5,834,705
2.500% 4/01/54 (f)		3,500,000		2,893,106
3.000% 4/01/54 (f)		5,750,000		4,948,145
3.500% 4/01/54 (f)		4,425,000		3,959,165
4.000% 4/01/54 (f)		14,300,000		13,242,023
4.500% 4/01/54 (f)		6,750,000		6,427,530
5.000% 4/01/54 (f)		6,625,000		6,466,103
5.500% 4/01/54 (f)		4,525,000		4,503,259
				122,075,048
Whole Loans — 0.3%
Federal National Mortgage Association Connecticut Avenue Securities, Series 2022-R03, Class 1M2, 30 day USD SOFR Average + 3.500%
8.820% FRN 3/25/42 (b)		1,000,000		1,049,324
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES (Cost $130,505,031)				125,685,776
U.S. TREASURY OBLIGATIONS — 39.3%
U.S. Treasury Bonds & Notes — 39.3%
U.S. Treasury Bonds
4.250% 2/15/54		15,777,000		15,515,694
4.500% 2/15/44 (d)		20,945,000		21,088,997
U.S. Treasury Notes
4.000% 2/15/34		19,955,000		19,624,495
4.125% 3/31/29		35,965,000		35,819,522
4.250% 3/15/27		13,195,000		13,134,179
4.250% 2/28/29		17,470,000		17,497,896

MML Total Return Bond Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
4.500% 3/31/26	$	7,155,000	$	7,138,658
				129,819,441
TOTAL U.S. TREASURY OBLIGATIONS (Cost $129,653,087)				129,819,441
TOTAL BONDS & NOTES (Cost $389,833,667)				378,990,713
	Number of Shares
EQUITIES — 0.1%
COMMON STOCK — 0.1%
Communication Services — 0.1%
Intelsat SA (h)		7,225		187,850
TOTAL COMMON STOCK (Cost $676,994)				187,850
TOTAL EQUITIES (Cost $676,994)				187,850
TOTAL LONG-TERM INVESTMENTS (Cost $390,510,661)				379,178,563
SHORT-TERM INVESTMENTS — 24.1%
Investment of Cash Collateral from Securities Loaned — 5.5%
State Street Navigator Securities Lending Government Money Market Portfolio (i)		17,996,178		17,996,178
	Principal Amount
Repurchase Agreement — 13.9%
Fixed Income Clearing Corp., Repurchase Agreement, dated 3/28/24, 1.600%, due 4/01/24 (j)	$	45,766,315		45,766,315
U.S. Treasury Bill — 4.7%
U.S. Treasury Bills
5.374% 4/16/24 (k)		3,955,000		3,944,552
5.380% 4/16/24 (k)		5,180,000		5,166,316
5.385% 4/23/24 (k)		6,240,000		6,217,185
5.401% 4/02/24 (k)		325,000		324,810
				15,652,863
TOTAL SHORT-TERM INVESTMENTS (Cost $79,422,699)				79,415,356
TOTAL INVESTMENTS — 138.8% (Cost $469,933,360) (l)				458,593,919
Other Assets/(Liabilities) — (38.8)%				(128,256,617)
NET ASSETS — 100.0%			$	330,337,302

Abbreviation Legend

CLO Collateralized Loan Obligation

CMT Constant Maturity Treasury Index

FRN Floating Rate Note

LIBOR London InterBank Offered Rate

MTA Monthly Treasury Average Index

REMICS Real Estate Mortgage Investment Conduits

SOFR Secured Overnight Financing Rate

STEP Step Coupon Bond

TBA To Be Announced

VRN Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) All or a portion of the security represents unsettled bank loan commitments at March 31, 2024 where the rate will be determined at time of settlement.

(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 March 31, 2024, the aggregate market value of these securities amounted to $52,505,234 or 15.89% of net assets.

(c) The principal amount of the security is in foreign currency. The market value is in U.S. dollars.

(d) Denotes all or a portion of security on loan. The total value of securities on loan as of March 31, 2024, was $17,629,634 or 5.34% of net assets. (Note 2).

(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 March 31, 2024.

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

(g) May contain securities that are issued by a U.S. Government Agency, but are unsecured and are not guaranteed by a U.S. Government Agency.

(h) Non-income producing security.

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

(j) Maturity value of $45,774,451. Collateralized by U.S. Government Agency obligations with a rate of 5.000%, maturity date of 9/30/25, and an aggregate market value, including accrued interest, of $46,681,656.

(k) The rate shown represents yield-to-maturity.

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

Forward contracts
Counterparty	Settlement Date	Currency Purchased		Currency Sold		Unrealized Appreciation (Depreciation)
Bank of America N.A.	4/12/24	USD	102,584	EUR	94,000	$	1,136
Bank of New York	4/12/24	USD	111,585	EUR	103,000		424
Citibank N.A.	4/12/24	EUR	262,000	USD	284,917		(2,158)
Citibank N.A.	4/12/24	USD	340,811	GBP	267,000		3,800
Citibank N.A.	4/12/24	USD	4,049,077	EUR	3,684,000		73,190
Goldman Sachs International	4/12/24	USD	11,942	EUR	11,000		71
						$	76,463

Futures contracts
	Expiration Date	Number of Contracts		Notional Amount		Value/Net Unrealized Appreciation (Depreciation)
Long
U.S. Treasury Ultra 10 Year	6/18/24		6	$	683,682	$	3,974
U.S. Treasury Note 2 Year	6/28/24		462		94,544,281		(72,499)
U.S. Treasury Note 5 Year	6/28/24		39		4,169,610		3,999
						$	(64,526)
Short
Euro-BOBL	6/06/24		10	$	(1,270,010)	$	(5,730)
Euro-Bund	6/06/24		13		(1,857,601)		(13,060)
Euro-Buxl 30 Year Bond	6/06/24		2		(287,101)		(5,915)
U.S. Treasury Note 10 Year	6/18/24		5		(557,852)		3,868
						$	(20,837)

Centrally Cleared Interest Rate Swaps

Paid by the Fund

Received by the Fund

Rate/ Reference

Frequency

Rate/ Reference

Frequency

Termination Date

Notional Amount

Value

Upfront Premium Paid/ (Received)

Unrealized Appreciation (Depreciation)

Fixed 3.520%

Annually

12-Month USD SOFR

Annually

12/20/53

USD

2,201,000

$

40,659

$

—

$

40,659

Currency Legend

EUR Euro

GBP British Pound

USD U.S. Dollar

Notes to Portfolio of Investments (Unaudited)

1. The Funds

MML Series Investment Fund (the ''Trust'') is registered under the Investment Company Act of 1940, as amended, 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 December 19, 1984, as restated May 14, 1993, and further amended and restated as of December 15, 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''):

MML Conservative Allocation Fund ("Conservative Allocation Fund")

MML Balanced Allocation Fund ("Balanced Allocation Fund")

MML Moderate Allocation Fund ("Moderate Allocation Fund")

MML Growth Allocation Fund ("Growth Allocation Fund")

MML Aggressive Allocation Fund ("Aggressive Allocation Fund") 

MML American Funds Growth Fund ("MML American Funds Growth Fund")

MML American Funds Core Allocation Fund ("MML American Funds Core Allocation Fund")

MML Blue Chip Growth Fund ("Blue Chip Growth Fund")

MML Equity Income Fund ("Equity Income Fund")

MML Equity Index Fund ("Equity Index Fund")

MML Focused Equity Fund ("Focused Equity Fund")

MML Foreign Fund ("Foreign Fund")

MML Fundamental Equity Fund ("Fundamental Equity Fund")

MML Fundamental Value Fund ("Fundamental Value Fund")

MML Global Fund ("Global Fund")

MML Income & Growth Fund ("Income & Growth Fund")

MML International Equity Fund ("International Equity Fund")

MML Large Cap Growth Fund ("Large Cap Growth Fund")

MML Managed Volatility Fund ("Managed Volatility Fund")

MML Mid Cap Growth Fund ("Mid Cap Growth Fund")

MML Mid Cap Value Fund ("Mid Cap Value Fund")

MML Small Cap Growth Equity Fund ("Small Cap Growth Equity Fund")

MML Small Company Value Fund ("Small Company Value Fund")

MML Small/Mid Cap Value Fund ("Small/Mid Cap Value Fund")

MML Sustainable Equity Fund ("Sustainable Equity Fund")

MML Total Return Bond Fund ("Total Return Bond Fund")

The Trust makes shares of the Funds available for the investment of assets of various separate investment accounts established by Massachusetts Mutual Life Insurance Company ("MassMutual") and by life insurance companies which are subsidiaries of MassMutual. Shares of the Trust are not offered to the general public. MassMutual, MML Bay State Life Insurance Company, C.M. Life Insurance Company, and the Allocation Funds (as defined below), which are "funds of funds" series of the Trust, are the record owners of all of the outstanding shares of the Funds.

The Conservative Allocation Fund, Balanced Allocation Fund, Moderate Allocation Fund, Growth Allocation Fund, and Aggressive Allocation Fund (the "Allocation Funds") invest their investable assets in shares of series of the Trust and MML Series Investment Fund II advised by MML Investment Advisers, LLC ("MML Advisers") and non-affiliated mutual funds (together, the "MML Underlying Funds").

MML American Funds Growth Fund (the "Feeder Fund") invests all of its assets in Class 1 shares of the Growth Fund, a series of the American Funds Insurance Series (the "Master Fund"). The Master Fund is an open-end investment company and organized as a Massachusetts business trust. The Feeder Fund has an investment objective that is consistent with the Master Fund. The Master Fund intends to comply with the requirements under Subchapter M of the Internal Revenue Code of 1986, as amended (the "Code"), applicable to mutual funds and intends to distribute substantially all of its taxable income and capital gains to shareholders, which includes the Feeder Fund, to qualify as a regulated investment company. The performance of the Feeder Fund is directly affected by the performance of the Master Fund. The MML American Funds Core Allocation Fund invests all of its investable assets in shares of various series of American Funds Insurance Series, which are managed by Capital Research and Management Company (together, the "American Underlying Funds" and collectively with the MML Underlying Funds, the "Underlying Funds").

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; instead, MML Advisers will determine the fair value of a Fund’s securities in accordance with MML Advisers’ fair valuation policy and procedures. 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 or an Underlying Fund or the Master Fund holds foreign securities that trade on days that foreign securities markets are open.

The net asset value of each of the Allocation Funds, Feeder Fund, and MML American Funds Core Allocation Fund is based upon the net asset value(s) of the Master Fund or Underlying Funds, as applicable. Shares of the Master Fund and Underlying Funds are valued at their closing net asset values as reported on each business day.

The Prospectuses and Statements of Additional Information ("SAIs") for the Underlying Funds and the Master Fund, as applicable, explain the valuation methods for the Underlying Funds and the Master Fund, including the circumstances under which the Underlying Funds or the Master Fund, may use fair value pricing and the effects of doing so. Such Prospectuses and SAIs are available on the Securities and Exchange Commission’s ("SEC") EDGAR database on its website at http://www.sec.gov.

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.

Notes to Portfolio of Investments (Unaudited) (Continued)

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.

The Board of Trustees ("Trustees") have designated MML Advisers as the Funds’ "valuation designee," responsible for determining the fair value, in good faith, of securities and other instruments held by the Funds for which market quotations are not readily available or for which such market quotations or values are considered by MML Advisers or a 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). It is possible that a significant amount of a Fund’s assets will be subject to fair valuation in accordance with MML Advisers’ fair valuation policy and procedures. The fair value determined for an investment by MML Advisers 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 and certain Underlying Funds or the Master Fund 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.

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 may be fair valued using alternate valuation approaches including the following:

Market approach: considers factors including the price of recent investments in the same or similar security or financial metrics of comparable securities.

Income approach: considers factors including expected future cash flows, security specific risks, and corresponding discount rates.

Notes to Portfolio of Investments (Unaudited) (Continued)

Cost approach: considers factors including the value of the security’s underlying assets and liabilities.

Investments in series of preferred stock issued by Private Companies are typically valued utilizing the 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.

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.

Notes to Portfolio of Investments (Unaudited) (Continued)

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.

The Focused Equity Fund, Fundamental Value Fund, and Small/Mid Cap Value Fund characterized all long-term investments at Level 1, and all short-term investments at Level 2, as of March 31, 2024. The Allocation Funds, Feeder Fund, and MML American Funds Core Allocation Fund characterized all investments at Level 1, as of March 31, 2024. For each Fund noted in the preceding sentences, 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 March 31, 2024, for the remaining Funds' investments:

Blue Chip Growth Fund

Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock	$	469,577,433	$	1,310,068	$	750,669	$	471,638,170
Preferred Stock		—		—		911,759		911,759
Corporate Debt		—		972,172		—		972,172
Short-Term Investments		3,559		11,001,751		—		11,005,310
Total Investments	$	469,580,992	$	13,283,991	$	1,662,428	$	484,527,411

Equity Income Fund

Common Stock	$	340,985,659	$	13,469,862	*	$	—	$	354,455,521
Preferred Stock		621,128		2,329,418	*		—		2,950,546
Short-Term Investments		1,805,192		2,534,992			—		4,340,184
Total Investments	$	343,411,979	$	18,334,272		$	—	$	361,746,251

Equity Index Fund

Common Stock	$	705,167,791	$	—	$	—	$	705,167,791
Short-Term Investments		—		5,231,955		—		5,231,955
Total Investments	$	705,167,791	$	5,231,955	$	—	$	710,399,746
Asset Derivatives
Futures Contracts	$	130,862	$	—	$	—	$	130,862

Notes to Portfolio of Investments (Unaudited) (Continued)

Foreign Fund

Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock*
Australia	$	—	$	8,435,627	$	—	$	8,435,627
Belgium		656,208		5,974,438		—		6,630,646
Canada		1,361,350		—		—		1,361,350
Denmark		—		922,291		—		922,291
France		—		17,411,257		—		17,411,257
Germany		—		19,431,249		—		19,431,249
Hong Kong		—		1,162,535		—		1,162,535
Ireland		2,416,098		4,503,487		—		6,919,585
Israel		1,787,709		—		—		1,787,709
Italy		—		595,367		—		595,367
Japan		—		36,662,633		—		36,662,633
Luxembourg		—		1,680,884		—		1,680,884
Netherlands		—		9,114,014		—		9,114,014
Norway		—		2,101,305		—		2,101,305
Republic of Korea		—		3,634,402		—		3,634,402
Singapore		—		2,476,790		—		2,476,790
Sweden		—		4,194,490		—		4,194,490
Switzerland		—		5,541,023		—		5,541,023
United Kingdom		—		30,545,915		—		30,545,915
United States		3,541,456		11,263,724		—		14,805,180
Preferred Stock*
Germany		—		1,060,849		—		1,060,849
Short-Term Investments		3,741,838		—		—		3,741,838
Total Investments	$	13,504,659	$	166,712,280	$	—	$	180,216,939

Fundamental Equity Fund

Common Stock	$	142,385,821	$	1,639,950	*	$	—	$	144,025,771
Short-Term Investments		762,432		3,752,079			—		4,514,511
Total Investments	$	143,148,253	$	5,392,029		$	—	$	148,540,282

Global Fund

Common Stock*
Austria	$	—	$	779,081	$	—	$	779,081
Canada		4,810,771		—		—		4,810,771
Denmark		—		737,541		—		737,541
France		—		10,221,621		—		10,221,621
Germany		—		4,086,229		—		4,086,229
Israel		1,672,738		—		—		1,672,738
Japan		—		3,202,668		—		3,202,668
Mexico		—		467,223		—		467,223
Netherlands		—		2,992,205		—		2,992,205
Republic of Korea		—		1,494,116		—		1,494,116
Spain		—		3,710,739		—		3,710,739
Sweden		—		1,377,848		—		1,377,848
Switzerland		—		6,205,595		—		6,205,595
United Kingdom		—		9,723,040		—		9,723,040
United States		69,978,316		9,748,792		—		79,727,108
Short-Term Investments		2,696,220		590,419		—		3,286,639
Total Investments	$	79,158,045	$	55,337,117	$	—	$	134,495,162

Notes to Portfolio of Investments (Unaudited) (Continued)

Income & Growth Fund

Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock	$	154,729,991	$	—	$	—	$	154,729,991
Short-Term Investments		1,625,546		1,461,797		—		3,087,343
Total Investments	$	156,355,537	$	1,461,797	$	—	$	157,817,334

International Equity Fund

Common Stock*
Australia	$	—	$	3,018,431	$	—	$	3,018,431
Belgium		698,796		2,098,031		—		2,796,827
Canada		7,874,284		—		—		7,874,284
China		672,889		6,393,739		—		7,066,628
Denmark		—		7,213,569		—		7,213,569
France		—		39,123,695		—		39,123,695
Germany		—		35,728,191		—		35,728,191
Hong Kong		—		5,544,191		—		5,544,191
India		1,782,924		526,589		—		2,309,513
Indonesia		—		175,203		—		175,203
Ireland		—		1,241,485		—		1,241,485
Israel		1,554,159		—		—		1,554,159
Italy		3,815,040		6,573,300		—		10,388,340
Japan		—		28,389,804		—		28,389,804
Luxembourg		—		1,209,971		—		1,209,971
Netherlands		—		4,948,808		—		4,948,808
Portugal		—		1,314,240		—		1,314,240
Republic of Korea		—		3,009,269		—		3,009,269
Singapore		—		1,984,641		—		1,984,641
Spain		—		2,765,632		—		2,765,632
Sweden		—		2,540,069		—		2,540,069
Switzerland		—		18,384,383		—		18,384,383
Taiwan		2,679,369		—		—		2,679,369
United Kingdom		—		24,779,084		—		24,779,084
United States		5,544,443		19,628,357		—		25,172,800
Preferred Stock*
Republic of Korea		—		1,423,071		—		1,423,071
Short-Term Investments		2,939,988		1,952,312		—		4,892,300
Total Investments	$	27,561,892	$	219,966,065	$	—	$	247,527,957

Large Cap Growth Fund

Common Stock	$	197,024,066	$	—	$	—	$	197,024,066
Short-Term Investments		1,615,001		8,436,474		—		10,051,475
Total Investments	$	198,639,067	$	8,436,474	$	—	$	207,075,541

Notes to Portfolio of Investments (Unaudited) (Continued)

Managed Volatility Fund

Asset Investments	Level 1			Level 2		Level 3			Total
Common Stock	$	101,283,226		$	—	$	—		$	101,283,226
Corporate Debt		—			—		—	+		—
Purchased Options		415,084			—		—			415,084
Rights		—			—		—	+		—
Short-Term Investments		—			2,669,674		—			2,669,674
Total Investments	$	101,698,310		$	2,669,674	$	—		$	104,367,984
Liability Derivatives
Written Options	$	(1,775,701	)	$	—	$	—		$	(1,775,701	)

Mid Cap Growth Fund

Common Stock	$	343,989,895	$	—	$	—	$	343,989,895
Preferred Stock		—		—		740,514		740,514
Short-Term Investments		542,726		9,351,186		—		9,893,912
Total Investments	$	344,532,621	$	9,351,186	$	740,514	$	354,624,321

Mid Cap Value Fund

Common Stock	$	245,053,552	$	21,201,234	*	$	—	$	266,254,786
Preferred Stock		—		2,149,103	*		—		2,149,103
Short-Term Investments		—		2,016,999			—		2,016,999
Total Investments	$	245,053,552	$	25,367,336		$	—	$	270,420,888
Asset Derivatives
Forward Contracts	$	—	$	81,133			—	$	81,133
Liability Derivatives
Forward Contracts	$	—	$	(4,825	)	$	—	$	(4,825	)

Small Cap Growth Equity Fund

Common Stock	$	150,792,553	$	—	$	—	$	150,792,553
Exchange-Traded Funds		1,557,688		—		—		1,557,688
Short-Term Investments		1,517,043		1,736,926		—		3,253,969
Total Investments	$	153,867,284	$	1,736,926	$	—	$	155,604,210

Notes to Portfolio of Investments (Unaudited) (Continued)

Small Company Value Fund

Asset Investments	Level 1		Level 2			Level 3		Total
Common Stock	$	74,146,738	$	477,378	*	$	—	$	74,624,116
Short-Term Investments		1,089,088		115,946			—		1,205,034
Total Investments	$	75,235,826	$	593,324		$	—	$	75,829,150
Asset Derivatives
Forward Contracts	$	—	$	5,543		$	—	$	5,543

Sustainable Equity Fund

Common Stock	$	149,629,269	$	1,907,321	*	$	—	$	151,536,590
Exchange-Traded Funds		87,876		—			—		87,876
Short-Term Investments		—		337,452			—		337,452
Total Investments	$	149,717,145	$	2,244,773		$	—	$	151,961,918
Asset Derivatives
Forward Contracts	$	—	$	2,797		$	—	$	2,797
Liability Derivatives
Forward Contracts	$	—	$	(46	)	$	—	$	(46	)

Total Return Bond Fund

Bank Loans	$	—		$	4,983,831		$	—	$	4,983,831
Corporate Debt		—			58,278,870			—		58,278,870
Municipal Obligations		—			2,489,769			—		2,489,769
Non-U.S. Government Agency Obligations		—			55,634,034			—		55,634,034
Sovereign Debt Obligations		—			2,098,992			—		2,098,992
U.S. Government Agency Obligations and Instrumentalities		—			125,685,776			—		125,685,776
U.S. Treasury Obligations		—			129,819,441			—		129,819,441
Common Stock		187,850			—			—		187,850
Short-Term Investments		17,996,178			61,419,178			—		79,415,356
Total Investments	$	18,184,028		$	440,409,891		$	—	$	458,593,919
Asset Derivatives
Forward Contracts	$	—		$	78,621		$	—	$	78,621
Futures Contracts		11,841			—			—		11,841
Swap Agreements		—			40,659			—		40,659
Total	$	11,841		$	119,280		$	—	$	131,121
Liability Derivatives
Forward Contracts	$	—		$	(2,158	)	$	—	$	(2,158	)
Futures Contracts		(97,204	)		—			—		(97,204	)
Total	$	(97,204	)	$	(2,158	)	$	—	$	(99,362	)

Notes to Portfolio of Investments (Unaudited) (Continued)

* 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.

+ Represents a security at $0 value as of March 31, 2024.

Derivative Instruments

Derivatives are financial instruments whose values are based on the values of one or more underlying 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 SEC's 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, other than the Allocation Funds, Feeder Fund, and MML American Funds Core Allocation 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").

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 March 31, 2024, the Funds' collateral was equal to or greater than 100% of the market value of securities on loan and all of the Funds’ cash collateral was invested in the State Street Navigator Securities Lending Government Money Market Portfolio.

Notes to Portfolio of Investments (Unaudited) (Continued)

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.

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.

Foreign Securities

The Global Fund invests a significant amount of its assets in foreign securities and each of the Foreign Fund and International Equity Fund invests substantially all of its assets in foreign securities. The other Funds, except for the Allocation Funds, Feeder Fund, and MML American Funds Core Allocation Fund may also invest in foreign securities. In addition, certain Underlying Funds or the Master Fund may 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, public health, and diplomatic risks. In addition, fluctuations in currency exchange rates may favorably or unfavorably 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, less stringent investor protection and disclosure standards, less reliable settlement practices, greater price volatility, higher relative rates of inflation, greater political, economic, and social instability, greater custody and operational risks, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments, and greater volatility in currency exchange rates, and are more susceptible to environmental problems.

Federal Income Tax

It is each Fund’s intent to continue to comply with the provisions of Subchapter M of the Code, applicable to a regulated investment company. Under such provisions, the Funds would not be subject to U.S. 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 U.S. federal income tax.

Dividends and Distributions to Shareholders 

Dividends from net investment income and 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.

Notes to Portfolio of Investments (Unaudited) (Continued)

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 March 31, 2024, 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 U.S. federal income tax basis, were as follows:

	Federal Income Tax Cost		Tax Basis Unrealized Appreciation		Tax Basis Unrealized (Depreciation)			Net Unrealized Appreciation (Depreciation)
Conservative Allocation Fund	$	287,521,306	$	6,644,258	$	(23,260,439	)	$	(16,616,181	)
Balanced Allocation Fund		334,804,576		12,393,497		(24,333,233	)		(11,939,736	)
Moderate Allocation Fund		1,179,116,060		42,441,228		(68,815,674	)		(26,374,446	)
Growth Allocation Fund		973,866,461		47,924,924		(48,581,019	)		(656,095	)
Aggressive Allocation Fund		131,684,618		5,389,064		(4,641,112	)		747,952
MML American Funds Growth Fund		208,903,528		56,683,733		–			56,683,733
MML American Funds Core Allocation Fund		611,739,927		84,824,952		(32,669,302	)		52,155,650
Blue Chip Growth Fund		293,347,144		204,120,458		(12,940,191	)		191,180,267
Equity Income Fund		267,806,468		99,877,467		(5,937,684	)		93,939,783
Equity Index Fund		329,464,167		397,740,943		(16,805,364	)		380,935,579
Focused Equity Fund		235,677,090		59,020,613		(3,902,748	)		55,117,865
Foreign Fund		163,743,219		32,557,198		(16,083,478	)		16,473,720
Fundamental Equity Fund		116,242,456		34,061,595		(1,763,769	)		32,297,826
Fundamental Value Fund		129,641,666		49,347,738		(1,268,823	)		48,078,915
Global Fund		104,697,513		33,442,023		(3,644,374	)		29,797,649
Income & Growth Fund		122,965,826		38,287,334		(3,435,826	)		34,851,508
International Equity Fund		230,714,605		38,095,314		(21,281,962	)		16,813,352
Large Cap Growth Fund		147,197,165		67,515,778		(7,637,402	)		59,878,376
Managed Volatility Fund		59,756,584		47,276,874		(2,665,474	)		44,611,400
Mid Cap Growth Fund		260,850,296		101,013,655		(7,239,630	)		93,774,025
Mid Cap Value Fund		261,555,215		23,408,873		(14,543,200	)		8,865,673
Small Cap Growth Equity Fund		128,174,236		36,947,870		(9,517,896	)		27,429,974
Small Company Value Fund		70,512,258		10,889,805		(5,572,913	)		5,316,892
Small/Mid Cap Value Fund		119,201,160		26,061,773		(7,986,787	)		18,074,986
Sustainable Equity Fund		103,661,057		51,668,218		(3,367,357	)		48,300,861
Total Return Bond Fund		469,933,360		1,583,803		(12,923,244	)		(11,339,441	)

4. New Accounting Pronouncements

In December 2022, FASB issued Accounting Standards Update 2022-06, “Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848” (“ASU 2022-06”). ASU 2022-06 is an update of ASU 2020-04, which responded to concerns about structural risks of interbank offered rates, and particularly the risk of cessation of LIBOR. ASU 2020-04 provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. ASU 2020-04 is elective and applies to all entities, subject to meeting certain criteria, that have contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. ASU 2022-06 defers the sunset date provision included in Topic 848. The amendments in this update are effective immediately through December 31, 2024, for all entities. Management does not expect ASU 2022-06 to have a material impact on the financial statements.

5. Russia-Ukraine War

In February 2022, Russia commenced a large-scale military attack on Ukraine. The outbreak of hostilities between the two countries could result in more widespread conflict and could have a severe adverse effect on the regional and the global financial markets and economies. One or more of the Funds hold positions in securities or other instruments that are economically tied to Russia. Investments in Russia are subject to political, economic, legal, market, and currency risks, as well as the risks related to the economic sanctions on Russia, Russian individuals, and Russian corporate and banking entities imposed by the United States, other countries, and certain international organizations. Such sanctions — which affect companies in many sectors, including energy, financial services, and defense, among others — could adversely affect the global energy and financial markets and, thus, could affect the value of a Fund’s investments, even beyond any direct exposure the Fund may have to Russian issuers or the adjoining geographic regions. These sanctions and any other intergovernmental actions (including retaliatory actions by the Russian government) may also result in a decline in the value and liquidity of Russian securities and a weakening of the ruble, and will impair a Fund's ability to buy, sell, receive, or deliver Russian securities. In addition, certain transactions have been or may be prohibited and/or existing investments have or may become illiquid (e.g., because transacting in certain existing investments is prohibited), which could cause a Fund to sell other portfolio holdings at a disadvantageous time or price in order to meet shareholder redemptions.