MML Series Investment Fund NPORT-P MML Equity Index Fund (Sep 2023 report)

MML Conservative Allocation Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 39.7%
MML Blue Chip Growth Fund, Initial Class (a)		820,093	$	11,514,099
MML Equity Income Fund, Initial Class (a)		1,179,563		10,568,881
MML Focused Equity Fund, Class II (a)		2,105,637		13,728,751
MML Foreign Fund, Initial Class (a)		607,462		5,248,472
MML Fundamental Equity Fund, Class II (a)		751,988		6,910,771
MML Fundamental Value Fund, Class II (a)		823,527		9,132,920
MML Global Fund, Class I (a)		1,385,103		5,304,944
MML Income & Growth Fund, Initial Class (a)		354,077		3,246,886
MML International Equity Fund, Class II (a)		1,515,029		14,014,015
MML Large Cap Growth Fund, Initial Class (a)		642,231		7,822,368
MML Mid Cap Growth Fund, Initial Class (a)		678,926		6,531,273
MML Mid Cap Value Fund, Initial Class (a)		772,014		5,527,623
MML Small Cap Growth Equity Fund, Initial Class (a)		41,626		362,759
MML Small Company Value Fund, Class II (a)		383,661		2,854,437
MML Small/Mid Cap Value Fund, Initial Class (a)		184,294		1,439,336
MML Strategic Emerging Markets Fund, Class II (a)		470,091		2,336,354
				106,543,889
Fixed Income Funds — 60.4%
Invesco V.I. Global Strategic Income Fund, Series I (b)		1,402,918		5,639,730
MML Dynamic Bond Fund, Class II (a)		4,126,246		32,556,078
MML High Yield Fund, Class II (a)		96,502		775,874
MML Inflation-Protected and Income Fund, Initial Class (a)		874,809		7,269,666
MML Managed Bond Fund, Initial Class (a)		5,143,434		51,992,276
MML Short-Duration Bond Fund, Class II (a)		1,664,644		14,399,170
MML Total Return Bond Fund, Class II (a)		5,451,350		45,736,824
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		517,898		3,682,254
				162,051,872
TOTAL MUTUAL FUNDS (Cost $321,456,075)				268,595,761
TOTAL LONG-TERM INVESTMENTS (Cost $321,456,075)				268,595,761
TOTAL INVESTMENTS — 100.1% (Cost $321,456,075) (c)				268,595,761
Other Assets/(Liabilities) — (0.1)%				(271,882)
NET ASSETS — 100.0%			$	268,323,879

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

September 30, 2023 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 49.7%
MML Blue Chip Growth Fund, Initial Class (a)		1,102,036	$	15,472,586
MML Equity Income Fund, Initial Class (a)		1,578,658		14,144,778
MML Focused Equity Fund, Class II (a)		4,006,123		26,119,923
MML Foreign Fund, Initial Class (a)		823,402		7,114,195
MML Fundamental Equity Fund, Class II (a)		1,130,305		10,387,506
MML Fundamental Value Fund, Class II (a)		1,034,890		11,476,929
MML Global Fund, Class I (a)		2,139,866		8,195,687
MML Income & Growth Fund, Initial Class (a)		847,816		7,774,470
MML International Equity Fund, Class II (a)		2,239,313		20,713,646
MML Large Cap Growth Fund, Initial Class (a)		921,620		11,225,333
MML Mid Cap Growth Fund, Initial Class (a)		854,134		8,216,773
MML Mid Cap Value Fund, Initial Class (a)		1,159,325		8,300,765
MML Small Cap Growth Equity Fund, Initial Class (a)		76,215		664,191
MML Small Company Value Fund, Class II (a)		457,605		3,404,584
MML Small/Mid Cap Value Fund, Initial Class (a)		255,989		1,999,274
MML Strategic Emerging Markets Fund, Class II (a)		636,861		3,165,200
				158,375,840
Fixed Income Funds — 50.4%
Invesco V.I. Global Strategic Income Fund, Series I (b)		1,404,007		5,644,107
MML Dynamic Bond Fund, Class II (a)		4,061,115		32,042,201
MML High Yield Fund, Class II (a)		100,224		805,799
MML Inflation-Protected and Income Fund, Initial Class (a)		1,021,599		8,489,485
MML Managed Bond Fund, Initial Class (a)		5,118,711		51,742,358
MML Short-Duration Bond Fund, Class II (a)		1,507,648		13,041,154
MML Total Return Bond Fund, Class II (a)		5,390,738		45,228,296
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		532,440		3,785,652
				160,779,052
TOTAL MUTUAL FUNDS (Cost $373,681,896)				319,154,892
TOTAL LONG-TERM INVESTMENTS (Cost $373,681,896)				319,154,892
TOTAL INVESTMENTS — 100.1% (Cost $373,681,896) (c)				319,154,892
Other Assets/(Liabilities) — (0.1)%				(326,400)
NET ASSETS — 100.0%			$	318,828,492

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

September 30, 2023 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 59.8%
MML Blue Chip Growth Fund, Initial Class (a)		4,643,208	$	65,190,634
MML Equity Income Fund, Initial Class (a)		6,219,833		55,729,707
MML Focused Equity Fund, Class II (a)		15,793,995		102,976,849
MML Foreign Fund, Initial Class (a)		3,433,400		29,664,575
MML Fundamental Equity Fund, Class II (a)		4,759,328		43,738,225
MML Fundamental Value Fund, Class II (a)		5,229,367		57,993,678
MML Global Fund, Class I (a)		8,614,785		32,994,628
MML Income & Growth Fund, Initial Class (a)		3,145,553		28,844,717
MML International Equity Fund, Class II (a)		9,447,309		87,387,606
MML Large Cap Growth Fund, Initial Class (a)		4,303,462		52,416,165
MML Mid Cap Growth Fund, Initial Class (a)		4,126,141		39,693,477
MML Mid Cap Value Fund, Initial Class (a)		4,229,019		30,279,776
MML Small Cap Growth Equity Fund, Initial Class (a)		952,394		8,299,836
MML Small Company Value Fund, Class II (a)		2,280,759		16,968,845
MML Small/Mid Cap Value Fund, Initial Class (a)		1,252,395		9,781,209
MML Strategic Emerging Markets Fund, Class II (a)		2,640,883		13,125,188
				675,085,115
Fixed Income Funds — 40.3%
Invesco V.I. Global Strategic Income Fund, Series I (b)		3,404,001		13,684,084
MML Dynamic Bond Fund, Class II (a)		11,559,320		91,203,034
MML High Yield Fund, Class II (a)		368,994		2,966,710
MML Inflation-Protected and Income Fund, Initial Class (a)		2,381,519		19,790,421
MML Managed Bond Fund, Initial Class (a)		14,363,088		145,188,916
MML Short-Duration Bond Fund, Class II (a)		4,807,049		41,580,974
MML Total Return Bond Fund, Class II (a)		15,242,945		127,888,312
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		1,709,609		12,155,318
				454,457,769
TOTAL MUTUAL FUNDS (Cost $1,334,367,840)				1,129,542,884
TOTAL LONG-TERM INVESTMENTS (Cost $1,334,367,840)				1,129,542,884
TOTAL INVESTMENTS — 100.1% (Cost $1,334,367,840) (c)				1,129,542,884
Other Assets/(Liabilities) — (0.1)%				(1,009,050)
NET ASSETS — 100.0%			$	1,128,533,834

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

September 30, 2023 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 74.8%
MML Blue Chip Growth Fund, Initial Class (a)		4,829,977	$	67,812,884
MML Equity Income Fund, Initial Class (a)		5,802,608		51,991,366
MML Focused Equity Fund, Class II (a)		14,460,523		94,282,607
MML Foreign Fund, Initial Class (a)		3,219,515		27,816,608
MML Fundamental Equity Fund, Class II (a)		5,237,593		48,133,484
MML Fundamental Value Fund, Class II (a)		4,545,546		50,410,110
MML Global Fund, Class I (a)		8,363,527		32,032,309
MML Income & Growth Fund, Initial Class (a)		4,528,959		41,530,551
MML International Equity Fund, Class II (a)		8,825,004		81,631,287
MML Large Cap Growth Fund, Initial Class (a)		4,241,035		51,655,809
MML Mid Cap Growth Fund, Initial Class (a)		3,797,006		36,527,199
MML Mid Cap Value Fund, Initial Class (a)		4,190,292		30,002,489
MML Small Cap Growth Equity Fund, Initial Class (a)		859,870		7,493,522
MML Small Company Value Fund, Class II (a)		2,635,550		19,608,488
MML Small/Mid Cap Value Fund, Initial Class (a)		1,076,586		8,408,137
MML Strategic Emerging Markets Fund, Class II (a)		2,561,781		12,732,052
				662,068,902
Fixed Income Funds — 25.3%
Invesco V.I. Global Strategic Income Fund, Series I (b)		2,523,500		10,144,471
MML Dynamic Bond Fund, Class II (a)		5,457,710		43,061,333
MML High Yield Fund, Class II (a)		476,285		3,829,333
MML Inflation-Protected and Income Fund, Initial Class (a)		1,500,988		12,473,209
MML Managed Bond Fund, Initial Class (a)		6,832,126		69,062,374
MML Short-Duration Bond Fund, Class II (a)		2,476,333		21,420,278
MML Total Return Bond Fund, Class II (a)		6,778,684		56,873,160
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		1,061,223		7,545,295
				224,409,453
TOTAL MUTUAL FUNDS (Cost $1,038,574,695)				886,478,355
TOTAL LONG-TERM INVESTMENTS (Cost $1,038,574,695)				886,478,355
TOTAL INVESTMENTS — 100.1% (Cost $1,038,574,695) (c)				886,478,355
Other Assets/(Liabilities) — (0.1)%				(681,981)
NET ASSETS — 100.0%			$	885,796,374

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

September 30, 2023 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 90.1%
MML Blue Chip Growth Fund, Initial Class (a)		837,634	$	11,760,375
MML Equity Income Fund, Initial Class (a)		938,834		8,411,956
MML Focused Equity Fund, Class II (a)		2,508,741		16,356,990
MML Foreign Fund, Initial Class (a)		490,225		4,235,548
MML Fundamental Equity Fund, Class II (a)		784,383		7,208,484
MML Fundamental Value Fund, Class II (a)		733,968		8,139,700
MML Global Fund, Class I (a)		1,300,770		4,981,949
MML Income & Growth Fund, Initial Class (a)		467,220		4,284,404
MML International Equity Fund, Class II (a)		1,465,757		13,558,249
MML Large Cap Growth Fund, Initial Class (a)		746,641		9,094,082
MML Mid Cap Growth Fund, Initial Class (a)		725,051		6,974,994
MML Mid Cap Value Fund, Initial Class (a)		730,667		5,231,573
MML Small Cap Growth Equity Fund, Initial Class (a)		167,709		1,461,535
MML Small Company Value Fund, Class II (a)		401,000		2,983,443
MML Small/Mid Cap Value Fund, Initial Class (a)		161,559		1,261,775
MML Strategic Emerging Markets Fund, Class II (a)		354,757		1,763,143
				107,708,200
Fixed Income Funds — 10.0%
Invesco V.I. Global Strategic Income Fund, Series I (b)		242,718		975,727
MML Dynamic Bond Fund, Class II (a)		263,864		2,081,884
MML High Yield Fund, Class II (a)		19,757		158,846
MML Inflation-Protected and Income Fund, Initial Class (a)		22,804		189,501
MML Managed Bond Fund, Initial Class (a)		350,952		3,547,594
MML Short-Duration Bond Fund, Class II (a)		241,295		2,087,198
MML Total Return Bond Fund, Class II (a)		249,505		2,093,350
PIMCO Variable Insurance Trust - Long-Term U.S. Government Portfolio, Institutional Shares		106,830		759,558
				11,893,658
TOTAL MUTUAL FUNDS (Cost $141,714,960)				119,601,858
TOTAL LONG-TERM INVESTMENTS (Cost $141,714,960)				119,601,858
TOTAL INVESTMENTS — 100.1% (Cost $141,714,960) (c)				119,601,858
Other Assets/(Liabilities) — (0.1)%				(129,538)
NET ASSETS — 100.0%			$	119,472,320

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

September 30, 2023 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 100.1%
American Funds Insurance Series Growth Fund, Class 1		2,533,436	$	220,510,310
TOTAL MUTUAL FUNDS (Cost $219,176,993)				220,510,310
TOTAL INVESTMENTS — 100.1% (Cost $219,176,993) (a)				220,510,310
Other Assets/(Liabilities) — (0.1)%				(284,343)
NET ASSETS — 100.0%			$	220,225,967

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

September 30, 2023 (Unaudited)

	Number of Shares		Value
MUTUAL FUNDS — 100.1%
Equity Funds — 65.0%
American Funds Insurance Series® Growth-Income Fund, Class 1		3,229,590	$	171,135,974
American Funds Insurance Series® International Fund, Class 1		4,658,107		75,042,105
American Funds Insurance Series® Washington Mutual Investors Fund, Class 1		13,064,273		172,709,683
				418,887,762
Fixed Income Funds — 35.1%
American Funds Insurance Series® The Bond Fund Of America, Class 1		24,529,809		226,164,842
TOTAL MUTUAL FUNDS (Cost $680,115,321)				645,052,604
TOTAL LONG-TERM INVESTMENTS (Cost $680,115,321)				645,052,604
TOTAL INVESTMENTS — 100.1% (Cost $680,115,321) (a)				645,052,604
Other Assets/(Liabilities) — (0.1)%				(812,592)
NET ASSETS — 100.0%			$	644,240,012

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

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.2%
COMMON STOCK — 99.0%
Basic Materials — 0.9%
Chemicals — 0.9%
Linde PLC (LIN US)		5,326	$	1,983,136
Sherwin-Williams Co.		7,180		1,831,259
				3,814,395
Communications — 25.4%
Internet — 24.4%
Alphabet, Inc. Class A (a)		49,062		6,420,253
Alphabet, Inc. Class C (a)		216,556		28,552,908
Amazon.com, Inc. (a)		249,764		31,750,000
Booking Holdings, Inc. (a)		1,251		3,858,021
DoorDash, Inc., Class A (a)		12,349		981,375
Meta Platforms, Inc. Class A (a)		67,499		20,263,875
Netflix, Inc. (a)		14,241		5,377,402
Sea Ltd. ADR (a)		21,962		965,230
Shopify, Inc. Class A (a)		39,340		2,146,784
				100,315,848
Telecommunications — 1.0%
T-Mobile US, Inc. (a)		29,731		4,163,827
				104,479,675
Consumer, Cyclical — 6.3%
Apparel — 0.3%
NIKE, Inc. Class B		12,402		1,185,879
Auto Manufacturers — 2.9%
Tesla, Inc. (a)		47,567		11,902,215
Retail — 3.1%
Carvana Co. (a)		21,500		902,570
Chipotle Mexican Grill, Inc. (a)		2,015		3,691,138
Dollar General Corp.		14,548		1,539,178
Lululemon Athletica, Inc. (a)		5,204		2,006,714
Ross Stores, Inc.		21,820		2,464,569
TJX Cos., Inc.		22,271		1,979,447
				12,583,616
				25,671,710

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

	Number of Shares		Value
Consumer, Non-cyclical — 14.2%
Commercial Services — 1.0%
Adyen NV ADR (a)		87,050	$	644,170
Affirm Holdings, Inc. (a) (b)		12,998		276,468
Ant Group Balance Owed 2023 (Acquired 8/14/23, Cost $280,322) (a) (c) (d) (e)		280,322		274,491
Cintas Corp.		1,599		769,135
S&P Global, Inc.		5,723		2,091,241
				4,055,505
Food — 0.3%
Mondelez International, Inc. Class A		17,800		1,235,320
Health Care – Products — 4.3%
Align Technology, Inc. (a)		1,374		419,510
Danaher Corp.		12,584		3,122,090
Intuitive Surgical, Inc. (a)		20,910		6,111,784
Stryker Corp.		8,770		2,396,578
Teleflex, Inc.		2,401		471,581
Thermo Fisher Scientific, Inc.		10,490		5,309,723
				17,831,266
Health Care – Services — 4.6%
Elevance Health, Inc.		3,750		1,632,825
Humana, Inc.		6,157		2,995,504
UnitedHealth Group, Inc.		28,739		14,489,916
				19,118,245
Pharmaceuticals — 4.0%
AstraZeneca PLC Sponsored ADR		16,019		1,084,807
Eli Lilly & Co.		23,835		12,802,493
Zoetis, Inc.		13,909		2,419,888
				16,307,188
				58,547,524
Energy — 0.4%
Oil & Gas Services — 0.4%
Schlumberger NV		26,600		1,550,780
Financial — 8.8%
Banks — 0.7%
Goldman Sachs Group, Inc.		3,194		1,033,483
Morgan Stanley		23,532		1,921,858
				2,955,341
Diversified Financial Services — 6.3%
Charles Schwab Corp.		25,797		1,416,255
Mastercard, Inc. Class A		28,675		11,352,719
Visa, Inc. Class A		57,899		13,317,349
				26,086,323

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

	Number of Shares		Value
Insurance — 1.8%
Chubb Ltd.		21,299	$	4,434,026
Marsh & McLennan Cos., Inc.		15,031		2,860,399
				7,294,425
				36,336,089
Industrial — 1.4%
Aerospace & Defense — 0.3%
TransDigm Group, Inc. (a)		1,186		999,952
Electronics — 0.2%
TE Connectivity Ltd.		5,983		739,080
Miscellaneous - Manufacturing — 0.5%
General Electric Co.		19,069		2,108,078
Transportation — 0.4%
Old Dominion Freight Line, Inc.		4,398		1,799,398
				5,646,508
Technology — 41.1%
Computers — 10.4%
Apple, Inc.		243,653		41,715,830
Crowdstrike Holdings, Inc. Class A (a)		3,918		655,795
Fortinet, Inc. (a)		7,159		420,090
				42,791,715
Semiconductors — 9.4%
Advanced Micro Devices, Inc. (a)		22,221		2,284,763
ASML Holding NV		7,145		4,205,976
Lam Research Corp.		1,170		733,321
Marvell Technology, Inc.		20,063		1,086,010
Monolithic Power Systems, Inc.		4,667		2,156,154
NVIDIA Corp.		59,162		25,734,878
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR		15,369		1,335,566
Texas Instruments, Inc.		8,512		1,353,493
				38,890,161
Software — 21.3%
Atlassian Corp. Class A (a)		7,797		1,571,174
Bill Holdings, Inc. (a)		12,541		1,361,576
Canva, Inc. (Acquired 8/16/21-12/17/21, Cost $582,930) (a) (c) (d) (e)		342		364,798
Confluent, Inc. Class A (a)		18,846		558,030
Datadog, Inc. Class A (a)		7,682		699,753
Fiserv, Inc. (a)		7,763		876,909
Gusto, Inc. (Acquired 10/04/21, Cost $193,055) (a) (c) (d) (e)		6,706		103,138
Intuit, Inc.		10,003		5,110,933
Microsoft Corp.		173,890		54,905,768
MongoDB, Inc. (a)		6,530		2,258,466
MSCI, Inc.		1,042		534,629
Roper Technologies, Inc.		6,473		3,134,744
ServiceNow, Inc. (a)		16,369		9,149,616
Snowflake, Inc. Class A (a)		5,158		787,988
Synopsys, Inc. (a)		11,189		5,135,415

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

	Number of Shares		Value
Veeva Systems, Inc. Class A (a)		5,099	$	1,037,392
				87,590,329
				169,272,205
Utilities — 0.5%
Electric — 0.5%
Constellation Energy Corp.		17,700		1,930,715
TOTAL COMMON STOCK (Cost $299,509,485)				407,249,601
PREFERRED STOCK — 0.2%
Technology — 0.2%
Software — 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 $1,010,974)				911,759
TOTAL EQUITIES (Cost $300,520,459)				408,161,360
	Principal Amount
BONDS & NOTES — 0.2%
CORPORATE DEBT — 0.2%
Retail — 0.2%
Carvana Co.
12.000% 12/01/28 (f)	$	217,000		170,414
13.000% 6/01/30 (f)		326,000		254,280
14.000% 6/01/31 (f)		385,000		301,340
				726,034
TOTAL CORPORATE DEBT (Cost $1,035,905)				726,034
TOTAL BONDS & NOTES (Cost $1,035,905)				726,034
TOTAL LONG-TERM INVESTMENTS (Cost $301,556,364)				408,887,394

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

	Number of Shares		Value
SHORT-TERM INVESTMENTS — 0.3%
Mutual Fund — 0.0%
T. Rowe Price Government Reserve Investment Fund		105	$	105
	Principal Amount
Repurchase Agreement — 0.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (g)	$	1,385,995		1,385,995
TOTAL SHORT-TERM INVESTMENTS (Cost $1,386,100)				1,386,100
TOTAL INVESTMENTS — 99.7% (Cost $302,942,464) (h)				410,273,494
Other Assets/(Liabilities) — 0.3%				1,200,032
NET ASSETS — 100.0%			$	411,473,526

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 September 30, 2023, was $268,298 or 0.07% of net assets. The Fund received $274,100 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) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At September 30, 2023, these securities amounted to a value of $1,654,186 or 0.40% of net assets.

(d) Investment is valued using significant unobservable inputs.

(e) Restricted security. Certain securities are restricted to resale. At September 30, 2023, these securities amounted to a value of $1,654,186 or 0.40% of net assets. The Fund generally bears the costs, if any, associated with the disposition of restricted securities.

(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 September 30, 2023, the aggregate market value of these securities amounted to $726,034 or 0.18% of net assets.

(g) Maturity value of $1,386,180. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $1,413,789.

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

MML Equity Income Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.1%
COMMON STOCK — 98.2%
Basic Materials — 3.9%
Chemicals — 2.6%
CF Industries Holdings, Inc.		84,581	$	7,251,975
International Flavors & Fragrances, Inc.		12,292		837,946
RPM International, Inc.		4,002		379,429
				8,469,350
Forest Products & Paper — 1.3%
International Paper Co.		125,798		4,462,055
				12,931,405
Communications — 4.8%
Internet — 0.2%
Meta Platforms, Inc. Class A (a)		2,189		657,159
Media — 3.6%
Comcast Corp. Class A		31,356		1,390,325
News Corp. Class A		308,469		6,187,888
News Corp. Class B		32,373		675,625
Walt Disney Co. (a)		45,785		3,710,874
				11,964,712
Telecommunications — 1.0%
AT&T, Inc.		29,946		449,789
Cisco Systems, Inc.		12,794		687,806
Verizon Communications, Inc.		62,374		2,021,541
				3,159,136
				15,781,007
Consumer, Cyclical — 6.1%
Airlines — 0.8%
Southwest Airlines Co.		102,421		2,772,536
Auto Manufacturers — 1.2%
Cummins, Inc.		4,500		1,028,070
Volkswagen AG ADR		258,884		2,966,811
				3,994,881
Lodging — 0.9%
Las Vegas Sands Corp.		62,010		2,842,538

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Retail — 2.5%
Best Buy Co., Inc.		20,000	$	1,389,400
Dollar General Corp.		5,400		571,320
Kohl's Corp.		61,127		1,281,222
TJX Cos., Inc.		13,947		1,239,610
Walmart, Inc.		24,038		3,844,397
				8,325,949
Toys, Games & Hobbies — 0.7%
Mattel, Inc. (a)		102,190		2,251,246
				20,187,150
Consumer, Non-cyclical — 23.7%
Agriculture — 1.9%
Philip Morris International, Inc.		66,256		6,133,980
Beverages — 0.4%
Constellation Brands, Inc. Class A		5,719		1,437,356
Biotechnology — 0.3%
Biogen, Inc. (a)		4,200		1,079,442
Cosmetics & Personal Care — 1.5%
Colgate-Palmolive Co.		26,100		1,855,971
Kenvue, Inc.		153,261		3,077,481
				4,933,452
Food — 2.2%
Conagra Brands, Inc.		148,876		4,082,180
Mondelez International, Inc. Class A		7,200		499,680
Tyson Foods, Inc. Class A		56,080		2,831,479
				7,413,339
Health Care – Products — 2.6%
GE HealthCare Technologies, Inc. (a)		26,264		1,787,003
Medtronic PLC		41,770		3,273,097
Zimmer Biomet Holdings, Inc.		32,631		3,661,851
				8,721,951
Health Care – Services — 2.7%
Centene Corp. (a)		10,044		691,831
Elevance Health, Inc.		17,664		7,691,259
Humana, Inc.		1,000		486,520
				8,869,610
Household Products & Wares — 1.1%
Kimberly-Clark Corp.		28,508		3,445,192
Pharmaceuticals — 11.0%
AbbVie, Inc.		21,670		3,230,130
AstraZeneca PLC Sponsored ADR		31,561		2,137,311
Becton Dickinson & Co.		27,098		7,005,646
Cardinal Health, Inc.		6,018		522,483
Cigna Group		13,251		3,790,714

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
CVS Health Corp.		54,658	$	3,816,221
Johnson & Johnson		28,469		4,434,047
Merck & Co., Inc.		30,053		3,093,956
Pfizer, Inc.		99,059		3,285,787
Sanofi		23,225		2,492,093
Sanofi ADR		6,897		369,955
Viatris, Inc.		207,100		2,042,006
				36,220,349
				78,254,671
Energy — 9.6%
Oil & Gas — 8.3%
Chevron Corp.		7,586		1,279,151
EOG Resources, Inc.		26,280		3,331,253
EQT Corp.		35,000		1,420,300
Exxon Mobil Corp.		48,254		5,673,706
Hess Corp.		22,706		3,474,018
Suncor Energy, Inc. (b)		39,600		1,361,448
TotalEnergies SE		138,665		9,125,177
TotalEnergies SE Sponsored ADR		29,200		1,920,192
				27,585,245
Pipelines — 1.3%
Enbridge, Inc.		41,779		1,386,645
TC Energy Corp. (b)		54,428		1,872,867
Williams Cos., Inc.		29,600		997,224
				4,256,736
				31,841,981
Financial — 24.6%
Banks — 8.8%
Bank of America Corp.		55,239		1,512,444
Bank of New York Mellon Corp.		13,000		554,450
Citigroup, Inc.		34,040		1,400,065
Fifth Third Bancorp		138,337		3,504,076
Goldman Sachs Group, Inc.		2,981		964,562
Huntington Bancshares, Inc.		288,865		3,004,196
JP Morgan Chase & Co.		23,068		3,345,321
Morgan Stanley		17,929		1,464,262
PNC Financial Services Group, Inc.		3,289		403,791
State Street Corp.		5,196		347,924
US Bancorp		101,000		3,339,060
Wells Fargo & Co.		229,727		9,386,645
				29,226,796
Diversified Financial Services — 1.5%
Apollo Global Management, Inc.		12,400		1,113,024
Charles Schwab Corp.		70,568		3,874,183
				4,987,207
Insurance — 10.1%
American International Group, Inc.		136,368		8,263,901

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Chubb Ltd.		35,458	$	7,381,646
Equitable Holdings, Inc.		196,736		5,585,335
Hartford Financial Services Group, Inc.		46,483		3,296,109
Loews Corp.		56,277		3,562,897
MetLife, Inc.		81,503		5,127,354
				33,217,242
Private Equity — 0.2%
Carlyle Group, Inc.		25,249		761,510
Real Estate Investment Trusts (REITS) — 4.0%
Equity Residential		79,808		4,685,528
Lamar Advertising Co. Class A		1,400		116,858
Rayonier, Inc.		89,301		2,541,507
Vornado Realty Trust		5,843		132,519
Welltower, Inc.		6,948		569,180
Weyerhaeuser Co.		170,559		5,229,339
				13,274,931
				81,467,686
Industrial — 10.8%
Aerospace & Defense — 2.9%
Boeing Co. (a)		22,788		4,368,004
L3 Harris Technologies, Inc.		30,441		5,300,387
				9,668,391
Electronics — 0.4%
TE Connectivity Ltd.		9,563		1,181,317
Environmental Controls — 0.5%
Stericycle, Inc. (a)		40,489		1,810,263
Hand & Machine Tools — 1.1%
Stanley Black & Decker, Inc.		43,700		3,652,446
Machinery – Diversified — 0.1%
Flowserve Corp.		8,373		332,994
Miscellaneous - Manufacturing — 3.6%
3M Co.		7,387		691,571
General Electric Co.		70,581		7,802,729
Siemens AG Sponsored ADR		46,859		3,348,076
				11,842,376
Transportation — 2.2%
Norfolk Southern Corp.		8,800		1,732,984
Union Pacific Corp.		8,200		1,669,766
United Parcel Service, Inc. Class B		24,620		3,837,520
				7,240,270
				35,728,057

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Technology — 8.4%
Computers — 0.5%
Accenture PLC Class A		5,459	$	1,676,513
Semiconductors — 5.1%
Advanced Micro Devices, Inc. (a)		1,600		164,512
Applied Materials, Inc.		26,071		3,609,530
QUALCOMM, Inc.		71,811		7,975,330
Samsung Electronics Co. Ltd.		47,501		2,406,636
Texas Instruments, Inc.		17,660		2,808,117
				16,964,125
Software — 2.8%
Fiserv, Inc. (a)		32,894		3,715,706
Microsoft Corp.		16,990		5,364,593
				9,080,299
				27,720,937
Utilities — 6.3%
Electric — 6.2%
Ameren Corp.		17,696		1,324,192
Dominion Energy, Inc.		98,149		4,384,316
NextEra Energy, Inc.		37,187		2,130,443
PG&E Corp. (a)		31,053		500,885
Sempra		39,679		2,699,362
Southern Co.		146,671		9,492,547
				20,531,745
Gas — 0.1%
NiSource, Inc.		19,508		481,458
				21,013,203
TOTAL COMMON STOCK (Cost $278,242,786)				324,926,097
PREFERRED STOCK — 0.9%
Consumer, Cyclical — 0.7%
Auto Manufacturers — 0.7%
Dr Ing hc F Porsche AG 1.134% (c)		24,426		2,297,307
Utilities — 0.2%
Electric — 0.1%
NextEra Energy, Inc. Convertible 6.926% (b)		15,955		603,578
Gas — 0.1%
NiSource, Inc. 7.750% (b)		2,065		201,234
				804,812

MML Equity Income Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
TOTAL PREFERRED STOCK (Cost $3,318,154)			$	3,102,119
TOTAL EQUITIES (Cost $281,560,940)				328,028,216
TOTAL LONG-TERM INVESTMENTS (Cost $281,560,940)				328,028,216
SHORT-TERM INVESTMENTS — 2.0%
Investment of Cash Collateral from Securities Loaned — 1.2%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		4,094,037		4,094,037
Mutual Fund — 0.0%
T. Rowe Price Government Reserve Investment Fund		104		104
	Principal Amount
Repurchase Agreement — 0.8%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (e)	$	2,491,817		2,491,817
TOTAL SHORT-TERM INVESTMENTS (Cost $6,585,958)				6,585,958
TOTAL INVESTMENTS — 101.1% (Cost $288,146,898) (f)				334,614,174
Other Assets/(Liabilities) — (1.1)%				(3,776,748)
NET ASSETS — 100.0%			$	330,837,426

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 September 30, 2023, was $3,996,011 or 1.21% 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 September 30, 2023, the aggregate market value of these securities amounted to $2,297,307 or 0.69% of net assets.

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

(e) Maturity value of $2,492,150. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $2,541,671.

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

MML Equity Index Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.4%
COMMON STOCK — 98.4%
Basic Materials — 2.0%
Chemicals — 1.6%
Air Products & Chemicals, Inc.		3,602	$	1,020,807
Albemarle Corp.		1,903		323,586
Celanese Corp.		1,622		203,594
CF Industries Holdings, Inc.		3,160		270,938
Dow, Inc.		11,368		586,134
DuPont de Nemours, Inc.		7,443		555,173
Eastman Chemical Co.		1,931		148,146
Ecolab, Inc.		4,102		694,879
FMC Corp.		2,027		135,748
International Flavors & Fragrances, Inc.		4,136		281,951
Linde PLC (LIN US)		7,890		2,937,842
LyondellBasell Industries NV Class A		4,114		389,596
Mosaic Co.		5,384		191,670
PPG Industries, Inc.		3,818		495,577
Sherwin-Williams Co.		3,806		970,720
				9,206,361
Forest Products & Paper — 0.0%
International Paper Co.		5,624		199,483
Iron & Steel — 0.2%
Nucor Corp.		4,022		628,840
Steel Dynamics, Inc.		2,518		269,980
				898,820
Mining — 0.2%
Freeport-McMoRan, Inc.		23,242		866,694
Newmont Corp.		12,887		476,175
				1,342,869
				11,647,533
Communications — 13.5%
Advertising — 0.1%
Interpublic Group of Cos., Inc.		6,257		179,326
Omnicom Group, Inc.		3,234		240,868
				420,194
Internet — 10.4%
Airbnb, Inc. Class A (a)		6,894		945,926
Alphabet, Inc. Class A (a)		95,933		12,553,793
Alphabet, Inc. Class C (a)		81,605		10,759,619

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Amazon.com, Inc. (a)		146,887	$	18,672,276
Booking Holdings, Inc. (a)		577		1,779,439
CDW Corp.		2,167		437,214
eBay, Inc.		8,670		382,260
Etsy, Inc. (a)		2,000		129,160
Expedia Group, Inc. (a)		2,229		229,743
F5, Inc. (a)		980		157,917
Gen Digital, Inc.		9,221		163,027
Match Group, Inc. (a)		4,514		176,836
Meta Platforms, Inc. Class A (a)		35,938		10,788,947
Netflix, Inc. (a)		7,165		2,705,504
Palo Alto Networks, Inc. (a)		4,948		1,160,009
VeriSign, Inc. (a)		1,468		297,314
				61,338,984
Media — 1.2%
Charter Communications, Inc. Class A (a)		1,646		723,944
Comcast Corp. Class A		66,549		2,950,783
FactSet Research Systems, Inc.		621		271,538
Fox Corp. Class A		4,102		127,982
Fox Corp. Class B		2,133		61,601
News Corp. Class A		6,108		122,527
News Corp. Class B		1,969		41,093
Paramount Global Class B		7,797		100,581
Walt Disney Co. (a)		29,628		2,401,349
Warner Bros Discovery, Inc. (a)		35,941		390,319
				7,191,717
Telecommunications — 1.8%
Arista Networks, Inc. (a)		4,049		744,733
AT&T, Inc.		115,596		1,736,252
Cisco Systems, Inc.		65,892		3,542,354
Corning, Inc.		12,407		378,041
Juniper Networks, Inc.		5,214		144,897
Motorola Solutions, Inc.		2,701		735,320
T-Mobile US, Inc. (a)		8,370		1,172,218
Verizon Communications, Inc.		67,977		2,203,135
				10,656,950
				79,607,845
Consumer, Cyclical — 9.0%
Airlines — 0.2%
Alaska Air Group, Inc. (a)		2,074		76,904
American Airlines Group, Inc. (a)		10,583		135,568
Delta Air Lines, Inc.		10,422		385,614
Southwest Airlines Co.		9,650		261,226
United Airlines Holdings, Inc. (a)		5,317		224,909
				1,084,221
Apparel — 0.4%
NIKE, Inc. Class B		19,809		1,894,136
Ralph Lauren Corp.		666		77,316
Tapestry, Inc.		3,757		108,014

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
VF Corp.		5,352	$	94,570
				2,174,036
Auto Manufacturers — 2.4%
Cummins, Inc.		2,296		524,544
Ford Motor Co.		63,725		791,464
General Motors Co.		22,248		733,517
PACCAR, Inc.		8,475		720,545
Tesla, Inc. (a)		44,650		11,172,323
				13,942,393
Auto Parts & Equipment — 0.1%
Aptiv PLC (a)		4,573		450,852
BorgWarner, Inc.		3,801		153,446
				604,298
Distribution & Wholesale — 0.3%
Copart, Inc. (a)		13,913		599,511
Fastenal Co.		9,260		505,967
LKQ Corp.		4,326		214,180
Pool Corp.		633		225,411
W.W. Grainger, Inc.		724		500,892
				2,045,961
Entertainment — 0.1%
Caesars Entertainment, Inc. (a)		3,488		161,669
Live Nation Entertainment, Inc. (a)		2,333		193,732
				355,401
Home Builders — 0.3%
DR Horton, Inc.		4,923		529,075
Lennar Corp. Class A		4,083		458,235
NVR, Inc. (a)		53		316,055
PulteGroup, Inc.		3,548		262,729
				1,566,094
Home Furnishing — 0.0%
Whirlpool Corp.		887		118,592
Leisure Time — 0.1%
Carnival Corp. (a)		16,286		223,444
Norwegian Cruise Line Holdings Ltd. (a) (b)		6,876		113,316
Royal Caribbean Cruises Ltd. (a)		3,811		351,146
				687,906
Lodging — 0.3%
Hilton Worldwide Holdings, Inc.		4,229		635,111
Las Vegas Sands Corp.		5,329		244,281
Marriott International, Inc. Class A		4,051		796,265
MGM Resorts International		4,539		166,854
Wynn Resorts Ltd.		1,566		144,714
				1,987,225

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Retail — 4.8%
AutoZone, Inc. (a)		294	$	746,757
Bath & Body Works, Inc.		3,762		127,156
Best Buy Co., Inc.		3,155		219,178
CarMax, Inc. (a)		2,565		181,422
Chipotle Mexican Grill, Inc. (a)		447		818,828
Costco Wholesale Corp.		7,165		4,047,938
Darden Restaurants, Inc.		1,961		280,854
Dollar General Corp.		3,553		375,907
Dollar Tree, Inc. (a)		3,371		358,843
Domino's Pizza, Inc.		573		217,047
Genuine Parts Co.		2,278		328,898
Home Depot, Inc.		16,256		4,911,913
Lowe's Cos., Inc.		9,475		1,969,284
McDonald's Corp.		11,784		3,104,377
O'Reilly Automotive, Inc. (a)		977		887,956
Ross Stores, Inc.		5,508		622,129
Starbucks Corp.		18,521		1,690,412
Target Corp.		7,484		827,506
TJX Cos., Inc.		18,583		1,651,657
Tractor Supply Co.		1,759		357,165
Ulta Beauty, Inc. (a)		812		324,353
Walgreens Boots Alliance, Inc.		11,610		258,206
Walmart, Inc.		23,077		3,690,705
Yum! Brands, Inc.		4,542		567,478
				28,565,969
Toys, Games & Hobbies — 0.0%
Hasbro, Inc.		2,112		139,688
				53,271,784
Consumer, Non-cyclical — 19.7%
Agriculture — 0.7%
Altria Group, Inc.		28,695		1,206,625
Archer-Daniels-Midland Co.		8,668		653,741
Bunge Ltd.		2,442		264,346
Philip Morris International, Inc.		25,101		2,323,851
				4,448,563
Beverages — 1.6%
Brown-Forman Corp. Class B		2,965		171,051
Coca-Cola Co.		62,930		3,522,821
Constellation Brands, Inc. Class A		2,615		657,228
Keurig Dr Pepper, Inc.		16,267		513,549
Molson Coors Beverage Co. Class B		3,044		193,568
Monster Beverage Corp. (a)		12,026		636,777
PepsiCo, Inc.		22,259		3,771,565
				9,466,559
Biotechnology — 1.5%
Amgen, Inc.		8,649		2,324,505
Bio-Rad Laboratories, Inc. Class A (a)		346		124,024
Biogen, Inc. (a)		2,347		603,202
Corteva, Inc.		11,528		589,772

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Gilead Sciences, Inc.		20,147	$	1,509,816
Illumina, Inc. (a)		2,564		351,986
Incyte Corp. (a)		3,002		173,426
Moderna, Inc. (a)		5,316		549,090
Regeneron Pharmaceuticals, Inc. (a)		1,726		1,420,429
Vertex Pharmaceuticals, Inc. (a)		4,177		1,452,510
				9,098,760
Commercial Services — 1.7%
Automatic Data Processing, Inc.		6,662		1,602,744
Cintas Corp.		1,402		674,376
CoStar Group, Inc. (a)		6,625		509,396
Equifax, Inc.		1,989		364,345
FleetCor Technologies, Inc. (a)		1,197		305,642
Gartner, Inc. (a)		1,282		440,508
Global Payments, Inc.		4,204		485,100
MarketAxess Holdings, Inc.		611		130,534
Moody's Corp.		2,559		809,079
PayPal Holdings, Inc. (a)		17,755		1,037,957
Quanta Services, Inc.		2,354		440,363
Robert Half, Inc.		1,747		128,020
Rollins, Inc.		4,542		169,553
S&P Global, Inc.		5,262		1,922,787
United Rentals, Inc.		1,104		490,805
Verisk Analytics, Inc.		2,348		554,692
				10,065,901
Cosmetics & Personal Care — 1.3%
Colgate-Palmolive Co.		13,367		950,527
Estee Lauder Cos., Inc. Class A		3,760		543,508
Kenvue, Inc.		27,873		559,690
Procter & Gamble Co.		38,116		5,559,600
				7,613,325
Food — 1.0%
Campbell Soup Co.		3,255		133,715
Conagra Brands, Inc.		7,736		212,121
General Mills, Inc.		9,462		605,473
Hershey Co.		2,389		477,991
Hormel Foods Corp.		4,697		178,627
J. M. Smucker Co.		1,651		202,924
Kellogg Co.		4,170		248,157
Kraft Heinz Co.		12,938		435,234
Kroger Co.		10,590		473,903
Lamb Weston Holdings, Inc.		2,363		218,483
McCormick & Co., Inc.		4,068		307,704
Mondelez International, Inc. Class A		21,997		1,526,592
Sysco Corp.		8,213		542,469
Tyson Foods, Inc. Class A		4,630		233,769
				5,797,162
Health Care – Products — 3.4%
Abbott Laboratories		28,060		2,717,611
Align Technology, Inc. (a)		1,154		352,339
Baxter International, Inc.		8,202		309,543
Bio-Techne Corp.		2,553		173,783

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Boston Scientific Corp. (a)		23,676	$	1,250,093
Cooper Cos., Inc.		802		255,044
Danaher Corp.		10,625		2,636,062
DENTSPLY SIRONA, Inc.		3,444		117,647
Edwards Lifesciences Corp. (a)		9,830		681,022
GE HealthCare Technologies, Inc. (a)		6,341		431,442
Hologic, Inc. (a)		3,991		276,975
IDEXX Laboratories, Inc. (a)		1,346		588,565
Insulet Corp. (a)		1,130		180,224
Intuitive Surgical, Inc. (a)		5,682		1,660,792
Medtronic PLC		21,524		1,686,621
ResMed, Inc.		2,383		352,374
Revvity, Inc.		2,034		225,164
Steris PLC		1,610		353,266
Stryker Corp.		5,465		1,493,421
Teleflex, Inc.		761		149,468
Thermo Fisher Scientific, Inc.		6,241		3,159,007
Waters Corp. (a)		957		262,419
West Pharmaceutical Services, Inc.		1,194		448,001
Zimmer Biomet Holdings, Inc.		3,382		379,528
				20,140,411
Health Care – Services — 2.3%
Catalent, Inc. (a)		2,956		134,587
Centene Corp. (a)		8,755		603,044
Charles River Laboratories International, Inc. (a)		830		162,663
DaVita, Inc. (a)		871		82,336
Elevance Health, Inc.		3,810		1,658,950
HCA Healthcare, Inc.		3,254		800,419
Humana, Inc.		2,004		974,986
IQVIA Holdings, Inc. (a)		2,961		582,577
Laboratory Corp. of America Holdings		1,436		288,708
Molina Healthcare, Inc. (a)		945		309,856
Quest Diagnostics, Inc.		1,815		221,176
UnitedHealth Group, Inc.		14,978		7,551,758
Universal Health Services, Inc. Class B		1,020		128,244
				13,499,304
Household Products & Wares — 0.3%
Avery Dennison Corp.		1,308		238,933
Church & Dwight Co., Inc.		3,962		363,038
Clorox Co.		2,005		262,775
Kimberly-Clark Corp.		5,472		661,291
				1,526,037
Pharmaceuticals — 5.9%
AbbVie, Inc.		28,540		4,254,172
Becton Dickinson & Co.		4,691		1,212,764
Bristol-Myers Squibb Co.		33,780		1,960,591
Cardinal Health, Inc.		4,128		358,393
Cencora, Inc.		2,696		485,199
Cigna Group		4,798		1,372,564
CVS Health Corp.		20,787		1,451,348
Dexcom, Inc. (a)		6,286		586,484
Eli Lilly & Co.		12,894		6,925,754
Henry Schein, Inc. (a)		2,124		157,707

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Johnson & Johnson		38,936	$	6,064,282
McKesson Corp.		2,181		948,408
Merck & Co., Inc.		41,030		4,224,039
Organon & Co.		4,130		71,697
Pfizer, Inc.		91,292		3,028,156
Viatris, Inc.		19,434		191,619
Zoetis, Inc.		7,443		1,294,933
				34,588,110
				116,244,132
Energy — 4.7%
Energy – Alternate Sources — 0.1%
Enphase Energy, Inc. (a)		2,222		266,973
First Solar, Inc. (a)		1,727		279,066
SolarEdge Technologies, Inc. (a)		914		118,372
				664,411
Oil & Gas — 3.9%
APA Corp.		5,002		205,582
Chevron Corp.		28,689		4,837,539
ConocoPhillips		19,363		2,319,687
Coterra Energy, Inc.		12,283		332,255
Devon Energy Corp.		10,404		496,271
Diamondback Energy, Inc.		2,891		447,758
EOG Resources, Inc.		9,415		1,193,445
EQT Corp.		5,864		237,961
Exxon Mobil Corp.		64,730		7,610,954
Hess Corp.		4,482		685,746
Marathon Oil Corp.		9,794		261,990
Marathon Petroleum Corp.		6,465		978,413
Occidental Petroleum Corp.		10,729		696,098
Phillips 66		7,200		865,080
Pioneer Natural Resources Co.		3,770		865,404
Valero Energy Corp.		5,710		809,164
				22,843,347
Oil & Gas Services — 0.4%
Baker Hughes Co.		16,417		579,848
Halliburton Co.		14,529		588,425
Schlumberger NV		22,980		1,339,734
				2,508,007
Pipelines — 0.3%
Kinder Morgan, Inc.		31,345		519,700
ONEOK, Inc.		9,421		597,574
Targa Resources Corp.		3,617		310,049
Williams Cos., Inc.		19,753		665,479
				2,092,802
				28,108,567

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Financial — 13.6%
Banks — 3.7%
Bank of America Corp.		111,785	$	3,060,673
Bank of New York Mellon Corp.		12,592		537,049
Citigroup, Inc.		31,138		1,280,706
Citizens Financial Group, Inc.		7,637		204,672
Comerica, Inc.		2,133		88,626
Fifth Third Bancorp		11,035		279,517
Goldman Sachs Group, Inc.		5,331		1,724,952
Huntington Bancshares, Inc.		23,406		243,422
JP Morgan Chase & Co.		46,990		6,814,490
KeyCorp.		15,157		163,089
M&T Bank Corp.		2,689		340,024
Morgan Stanley		20,630		1,684,852
Northern Trust Corp.		3,377		234,634
PNC Financial Services Group, Inc.		6,440		790,639
Regions Financial Corp.		15,214		261,681
State Street Corp.		5,152		344,978
Truist Financial Corp.		21,596		617,862
US Bancorp		25,175		832,285
Wells Fargo & Co.		59,161		2,417,318
Zions Bancorp NA		2,400		83,736
				22,005,205
Diversified Financial Services — 3.5%
American Express Co.		9,407		1,403,430
Ameriprise Financial, Inc.		1,659		546,939
BlackRock, Inc.		2,269		1,466,886
Capital One Financial Corp.		6,191		600,837
Cboe Global Markets, Inc.		1,712		267,432
Charles Schwab Corp.		24,098		1,322,980
CME Group, Inc.		5,833		1,167,883
Discover Financial Services		4,042		350,158
Franklin Resources, Inc.		4,682		115,084
Intercontinental Exchange, Inc.		9,274		1,020,325
Invesco Ltd.		7,425		107,811
Mastercard, Inc. Class A		13,453		5,326,177
Nasdaq, Inc.		5,490		266,759
Raymond James Financial, Inc.		3,039		305,207
Synchrony Financial		6,762		206,714
T. Rowe Price Group, Inc.		3,641		381,832
Visa, Inc. Class A		25,981		5,975,890
				20,832,344
Insurance — 3.9%
Aflac, Inc.		8,741		670,872
Allstate Corp.		4,262		474,829
American International Group, Inc.		11,511		697,567
Aon PLC Class A		3,280		1,063,442
Arch Capital Group Ltd. (a)		6,040		481,448
Arthur J Gallagher & Co.		3,474		791,829
Assurant, Inc.		873		125,345
Berkshire Hathaway, Inc. Class B (a)		29,488		10,329,646
Brown & Brown, Inc.		3,817		266,579
Chubb Ltd.		6,641		1,382,523
Cincinnati Financial Corp.		2,549		260,737

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Everest Group Ltd.		695	$	258,311
Globe Life, Inc.		1,406		152,874
Hartford Financial Services Group, Inc.		4,945		350,650
Loews Corp.		2,990		189,297
Marsh & McLennan Cos., Inc.		7,987		1,519,926
MetLife, Inc.		10,214		642,563
Principal Financial Group, Inc.		3,596		259,164
Progressive Corp.		9,465		1,318,475
Prudential Financial, Inc.		5,870		557,004
Travelers Cos., Inc.		3,702		604,574
W. R. Berkley Corp.		3,255		206,660
Willis Towers Watson PLC		1,695		354,187
				22,958,502
Private Equity — 0.2%
Blackstone, Inc.		11,476		1,229,539
Real Estate — 0.1%
CBRE Group, Inc. Class A (a)		5,041		372,328
Real Estate Investment Trusts (REITS) — 2.2%
Alexandria Real Estate Equities, Inc.		2,518		252,052
American Tower Corp.		7,557		1,242,749
AvalonBay Communities, Inc.		2,303		395,517
Boston Properties, Inc.		2,313		137,577
Camden Property Trust		1,731		163,718
Crown Castle, Inc.		7,031		647,063
Digital Realty Trust, Inc.		4,895		592,393
Equinix, Inc.		1,517		1,101,736
Equity Residential		5,530		324,666
Essex Property Trust, Inc.		1,041		220,786
Extra Space Storage, Inc.		3,425		416,412
Federal Realty Investment Trust		1,189		107,759
Healthpeak Properties, Inc.		8,865		162,761
Host Hotels & Resorts, Inc.		11,532		185,319
Invitation Homes, Inc.		9,301		294,749
Iron Mountain, Inc.		4,729		281,139
Kimco Realty Corp.		10,048		176,744
Mid-America Apartment Communities, Inc.		1,892		243,406
Prologis, Inc.		14,938		1,676,193
Public Storage		2,566		676,192
Realty Income Corp.		11,461		572,362
Regency Centers Corp.		2,665		158,408
SBA Communications Corp.		1,757		351,699
Simon Property Group, Inc.		5,302		572,775
UDR, Inc.		4,901		174,819
Ventas, Inc.		6,486		273,255
VICI Properties, Inc.		16,285		473,893
Welltower, Inc.		8,388		687,145
Weyerhaeuser Co.		11,875		364,088
				12,927,375
				80,325,293
Industrial — 7.4%
Aerospace & Defense — 1.4%
Boeing Co. (a)		9,170		1,757,706

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
General Dynamics Corp.		3,648	$	806,098
Howmet Aerospace, Inc.		6,332		292,855
L3 Harris Technologies, Inc.		3,072		534,897
Lockheed Martin Corp.		3,624		1,482,071
Northrop Grumman Corp.		2,300		1,012,437
RTX Corp.		23,535		1,693,814
TransDigm Group, Inc. (a)		892		752,072
				8,331,950
Building Materials — 0.5%
Carrier Global Corp.		13,537		747,243
Johnson Controls International PLC		11,000		585,310
Martin Marietta Materials, Inc.		1,005		412,532
Masco Corp.		3,650		195,093
Mohawk Industries, Inc. (a)		856		73,453
Trane Technologies PLC		3,698		750,361
Vulcan Materials Co.		2,157		435,757
				3,199,749
Electrical Components & Equipment — 0.3%
AMETEK, Inc.		3,738		552,327
Emerson Electric Co.		9,267		894,914
Generac Holdings, Inc. (a)		1,008		109,832
				1,557,073
Electronics — 1.0%
Agilent Technologies, Inc.		4,795		536,177
Allegion PLC		1,426		148,589
Amphenol Corp. Class A		9,655		810,923
Fortive Corp.		5,733		425,159
Garmin Ltd.		2,481		261,001
Honeywell International, Inc.		10,736		1,983,369
Keysight Technologies, Inc. (a)		2,889		382,244
Mettler-Toledo International, Inc. (a)		357		395,581
TE Connectivity Ltd.		5,076		627,038
Trimble, Inc. (a)		4,015		216,248
				5,786,329
Engineering & Construction — 0.0%
Jacobs Solutions, Inc.		2,057		280,780
Environmental Controls — 0.3%
Pentair PLC		2,674		173,142
Republic Services, Inc.		3,334		475,128
Waste Management, Inc.		5,960		908,542
				1,556,812
Hand & Machine Tools — 0.1%
Snap-on, Inc.		858		218,842
Stanley Black & Decker, Inc.		2,483		207,529
				426,371
Machinery – Construction & Mining — 0.4%
Caterpillar, Inc.		8,249		2,251,977

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Machinery – Diversified — 0.8%
Deere & Co.		4,409	$	1,663,868
Dover Corp.		2,267		316,269
IDEX Corp.		1,226		255,033
Ingersoll Rand, Inc.		6,559		417,940
Nordson Corp.		873		194,827
Otis Worldwide Corp.		6,658		534,704
Rockwell Automation, Inc.		1,863		532,576
Westinghouse Air Brake Technologies Corp.		2,917		309,990
Xylem, Inc.		3,880		353,196
				4,578,403
Miscellaneous - Manufacturing — 1.2%
3M Co.		8,945		837,431
A.O. Smith Corp.		2,019		133,516
Axon Enterprise, Inc. (a)		1,138		226,451
Eaton Corp. PLC		6,464		1,378,642
General Electric Co.		17,598		1,945,459
Illinois Tool Works, Inc.		4,449		1,024,649
Parker-Hannifin Corp.		2,080		810,202
Teledyne Technologies, Inc. (a)		763		311,747
Textron, Inc.		3,203		250,282
				6,918,379
Packaging & Containers — 0.1%
Amcor PLC		23,848		218,448
Ball Corp.		5,099		253,828
Packaging Corp. of America		1,458		223,876
Sealed Air Corp.		2,372		77,944
Westrock Co.		4,149		148,534
				922,630
Shipbuilding — 0.0%
Huntington Ingalls Industries, Inc.		647		132,363
Transportation — 1.3%
C.H. Robinson Worldwide, Inc.		1,888		162,613
CSX Corp.		32,441		997,561
Expeditors International of Washington, Inc.		2,391		274,080
FedEx Corp.		3,750		993,450
JB Hunt Transport Services, Inc.		1,320		248,846
Norfolk Southern Corp.		3,671		722,930
Old Dominion Freight Line, Inc.		1,449		592,844
Union Pacific Corp.		9,855		2,006,774
United Parcel Service, Inc. Class B		11,695		1,822,900
				7,821,998
				43,764,814
Technology — 26.1%
Computers — 8.3%
Accenture PLC Class A		10,200		3,132,522
Apple, Inc.		237,731		40,701,925
Cognizant Technology Solutions Corp. Class A		8,166		553,165
DXC Technology Co. (a)		3,318		69,114

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
EPAM Systems, Inc. (a)		939	$	240,093
Fortinet, Inc. (a)		10,568		620,130
Hewlett Packard Enterprise Co.		21,013		364,996
HP, Inc.		14,055		361,213
International Business Machines Corp.		14,725		2,065,917
Leidos Holdings, Inc.		2,224		204,964
NetApp, Inc.		3,409		258,675
Seagate Technology Holdings PLC		3,122		205,896
Western Digital Corp. (a)		5,187		236,683
				49,015,293
Office & Business Equipment — 0.0%
Zebra Technologies Corp. Class A (a)		834		197,266
Semiconductors — 7.2%
Advanced Micro Devices, Inc. (a)		26,113		2,684,939
Analog Devices, Inc.		8,108		1,419,630
Applied Materials, Inc.		13,578		1,879,874
Broadcom, Inc.		6,673		5,542,460
Intel Corp.		67,636		2,404,460
KLA Corp.		2,211		1,014,097
Lam Research Corp.		2,155		1,350,689
Microchip Technology, Inc.		8,802		686,996
Micron Technology, Inc.		17,746		1,207,260
Monolithic Power Systems, Inc.		773		357,126
NVIDIA Corp.		39,939		17,373,066
NXP Semiconductors NV		4,169		833,467
ON Semiconductor Corp. (a)		7,003		650,929
Qorvo, Inc. (a)		1,619		154,566
QUALCOMM, Inc.		18,064		2,006,188
Skyworks Solutions, Inc.		2,580		254,362
Teradyne, Inc.		2,514		252,556
Texas Instruments, Inc.		14,681		2,334,426
				42,407,091
Software — 10.6%
Activision Blizzard, Inc.		11,601		1,086,202
Adobe, Inc. (a)		7,370		3,757,963
Akamai Technologies, Inc. (a)		2,468		262,941
ANSYS, Inc. (a)		1,405		418,058
Autodesk, Inc. (a)		3,472		718,391
Broadridge Financial Solutions, Inc.		1,913		342,523
Cadence Design Systems, Inc. (a)		4,395		1,029,748
Ceridian HCM Holding, Inc. (a)		2,513		170,507
Electronic Arts, Inc.		3,986		479,914
Fair Isaac Corp. (a)		405		351,755
Fidelity National Information Services, Inc.		9,606		530,924
Fiserv, Inc. (a)		9,857		1,113,447
Intuit, Inc.		4,528		2,313,536
Jack Henry & Associates, Inc.		1,182		178,647
Microsoft Corp.		120,187		37,949,045
MSCI, Inc.		1,279		656,229
Oracle Corp.		25,455		2,696,194
Paychex, Inc.		5,203		600,062
Paycom Software, Inc.		788		204,305
PTC, Inc. (a)		1,921		272,167
Roper Technologies, Inc.		1,729		837,320

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Salesforce, Inc. (a)		15,749	$	3,193,582
ServiceNow, Inc. (a)		3,304		1,846,804
Synopsys, Inc. (a)		2,460		1,129,066
Take-Two Interactive Software, Inc. (a)		2,571		360,943
Tyler Technologies, Inc. (a)		680		262,575
				62,762,848
				154,382,498
Utilities — 2.4%
Electric — 2.2%
AES Corp.		10,850		164,920
Alliant Energy Corp.		4,075		197,434
Ameren Corp.		4,259		318,701
American Electric Power Co., Inc.		8,348		627,937
CenterPoint Energy, Inc.		10,231		274,702
CMS Energy Corp.		4,729		251,157
Consolidated Edison, Inc.		5,577		477,001
Constellation Energy Corp.		5,200		567,216
Dominion Energy, Inc.		13,553		605,413
DTE Energy Co.		3,342		331,794
Duke Energy Corp.		12,497		1,102,985
Edison International		6,210		393,031
Entergy Corp.		3,428		317,090
Evergy, Inc.		3,724		188,807
Eversource Energy		5,655		328,838
Exelon Corp.		16,129		609,515
FirstEnergy Corp.		8,344		285,198
NextEra Energy, Inc.		32,722		1,874,643
NRG Energy, Inc.		3,733		143,795
PG&E Corp. (a)		33,814		545,420
Pinnacle West Capital Corp.		1,837		135,350
PPL Corp.		11,953		281,613
Public Service Enterprise Group, Inc.		8,092		460,516
Sempra		10,205		694,246
Southern Co.		17,684		1,144,508
WEC Energy Group, Inc.		5,115		412,013
Xcel Energy, Inc.		8,925		510,688
				13,244,531
Gas — 0.1%
Atmos Energy Corp.		2,344		248,300
NiSource, Inc.		6,695		165,233
				413,533
Water — 0.1%
American Water Works Co., Inc.		3,156		390,807
				14,048,871

MML Equity Index Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
TOTAL COMMON STOCK (Cost $323,762,890)			$	581,401,337
TOTAL EQUITIES (Cost $323,762,890)				581,401,337
TOTAL LONG-TERM INVESTMENTS (Cost $323,762,890)				581,401,337
	Principal Amount
SHORT-TERM INVESTMENTS — 1.6%
Repurchase Agreement — 1.5%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (c)	$	8,629,602		8,629,602
U.S. Treasury Bill — 0.1%
U.S. Treasury Bills
5.294% 10/26/23 (d) (e)		5,000		4,983
5.387% 10/26/23 (d)		15,000		14,947
5.404% 10/26/23 (d)		580,000		577,957
				597,887
TOTAL SHORT-TERM INVESTMENTS (Cost $9,227,314)				9,227,489
TOTAL INVESTMENTS — 100.0% (Cost $332,990,204) (f)				590,628,826
Other Assets/(Liabilities) — 0.0%				17,974
NET ASSETS — 100.0%			$	590,646,800

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 September 30, 2023, was $115,311 or 0.02% of net assets. The Fund received $118,186 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 $8,630,753. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $8,802,211.

(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	12/15/23		43	$	9,718,251	$	(418,426)

MML Focused Equity Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 96.4%
COMMON STOCK — 96.4%
Basic Materials — 4.3%
Chemicals — 4.3%
Linde PLC (LIN US)		32,182	$	11,982,967
Consumer, Cyclical — 13.6%
Apparel — 4.4%
NIKE, Inc. Class B		128,481		12,285,353
Retail — 9.2%
McDonald's Corp.		39,478		10,400,085
TJX Cos., Inc.		168,431		14,970,147
				25,370,232
				37,655,585
Consumer, Non-cyclical — 34.0%
Beverages — 5.9%
Coca-Cola Co.		82,022		4,591,592
PepsiCo, Inc.		69,574		11,788,618
				16,380,210
Cosmetics & Personal Care — 8.2%
Colgate-Palmolive Co.		161,162		11,460,230
Procter & Gamble Co.		76,681		11,184,690
				22,644,920
Health Care – Products — 11.2%
Danaher Corp.		53,884		13,368,620
Medtronic PLC		90,296		7,075,595
Stryker Corp.		38,681		10,570,357
				31,014,572
Health Care – Services — 5.6%
UnitedHealth Group, Inc.		30,368		15,311,242
Pharmaceuticals — 3.1%
Johnson & Johnson		54,726		8,523,575
				93,874,519
Financial — 20.5%
Diversified Financial Services — 8.5%
American Express Co.		70,956		10,585,925

MML Focused Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Visa, Inc. Class A		56,375	$	12,966,814
				23,552,739
Insurance — 8.7%
Chubb Ltd.		55,338		11,520,265
Marsh & McLennan Cos., Inc.		65,374		12,440,672
				23,960,937
Real Estate Investment Trusts (REITS) — 3.3%
American Tower Corp.		54,511		8,964,334
				56,478,010
Industrial — 13.2%
Aerospace & Defense — 6.9%
Lockheed Martin Corp.		11,403		4,663,371
Northrop Grumman Corp.		32,692		14,390,691
				19,054,062
Electronics — 4.4%
Honeywell International, Inc.		66,546		12,293,708
Transportation — 1.9%
Union Pacific Corp.		25,323		5,156,523
				36,504,293
Technology — 10.8%
Computers — 3.8%
Accenture PLC Class A		34,361		10,552,607
Semiconductors — 3.0%
Texas Instruments, Inc.		51,527		8,193,308
Software — 4.0%
Microsoft Corp.		35,101		11,083,141
				29,829,056
TOTAL COMMON STOCK (Cost $242,981,536)				266,324,430
TOTAL EQUITIES (Cost $242,981,536)				266,324,430
TOTAL LONG-TERM INVESTMENTS (Cost $242,981,536)				266,324,430

MML Focused Equity Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
SHORT-TERM INVESTMENTS — 3.7%
Repurchase Agreement — 3.7%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (a)	$	10,232,357	$	10,232,357
TOTAL SHORT-TERM INVESTMENTS (Cost $10,232,357)				10,232,357
TOTAL INVESTMENTS — 100.1% (Cost $253,213,893) (b)				276,556,787
Other Assets/(Liabilities) — (0.1)%				(205,205)
NET ASSETS — 100.0%			$	276,351,582

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) Maturity value of $10,233,721. Collateralized by U.S. Government Agency obligations with a rate of 0.625%, maturity date of 1/15/26, and an aggregate market value, including accrued interest, of $10,437,079.

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

MML Foreign Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.2%
COMMON STOCK — 98.6%
Australia — 4.7%
BHP Group Ltd.		22,900	$	649,343
Glencore PLC		283,000		1,618,422
Macquarie Group Ltd.		16,000		1,721,590
Santos Ltd.		399,800		2,024,459
Sonic Healthcare Ltd.		57,600		1,102,033
Westpac Banking Corp.		61,800		839,598
				7,955,445
Belgium — 3.5%
Anheuser-Busch InBev SA		55,700		3,067,295
Groupe Bruxelles Lambert NV		14,200		1,055,423
KBC Group NV		28,500		1,776,902
				5,899,620
Canada — 0.7%
CCL Industries, Inc. Class B		17,900		751,319
TFI International, Inc. (a)		3,200		410,976
				1,162,295
China — 1.0%
NXP Semiconductors NV		8,200		1,639,344
Denmark — 0.4%
Novo Nordisk AS		7,200		654,954
Finland — 1.1%
Nokia Oyj		476,200		1,790,953
France — 9.1%
Accor SA		28,900		973,067
Amundi SA (b)		20,500		1,149,744
Capgemini SE		13,800		2,396,214
Cie de Saint-Gobain SA		19,100		1,144,253
Engie SA		65,200		999,738
Rexel SA		24,800		555,048
Societe Generale SA		49,000		1,185,323
Sodexo SA		14,100		1,452,120
TotalEnergies SE		41,800		2,750,748
Veolia Environnement SA		90,612		2,621,417
				15,227,672
Germany — 11.1%
Allianz SE Registered		8,500		2,026,923
BASF SE		21,300		966,859

MML Foreign Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Bayer AG Registered		10,200	$	489,905
Deutsche Boerse AG		9,200		1,590,177
Deutsche Post AG Registered		46,800		1,907,404
Heidelberg Materials AG		26,900		2,089,660
Infineon Technologies AG		60,900		2,019,744
K&S AG Registered		23,400		425,283
SAP SE		25,600		3,323,034
Siemens AG Registered		16,500		2,365,494
Siemens Energy AG (c)		36,100		472,281
Talanx AG (c)		6,700		424,901
Zalando SE (b) (c)		24,100		538,195
				18,639,860
Hong Kong — 0.9%
CK Asset Holdings Ltd.		282,200		1,484,325
Ireland — 3.9%
AerCap Holdings NV (c)		39,000		2,444,130
AIB Group PLC		436,900		1,967,434
Smurfit Kappa Group PLC		63,100		2,087,558
				6,499,122
Israel — 1.1%
Check Point Software Technologies Ltd. (c)		13,800		1,839,264
Italy — 0.4%
Prysmian SpA		15,400		617,842
Japan — 17.8%
Astellas Pharma, Inc.		128,700		1,777,657
Denka Co. Ltd. (a)		36,800		665,338
FANUC Corp.		58,500		1,527,030
Fujitsu Ltd.		15,700		1,847,211
Hitachi Ltd.		37,300		2,312,389
Kyocera Corp.		38,300		1,942,490
Nintendo Co. Ltd.		47,000		1,958,032
Olympus Corp.		86,400		1,119,404
ORIX Corp.		128,500		2,399,335
Rakuten Group, Inc.		288,400		1,181,082
SBI Holdings, Inc.		91,800		1,932,318
Seven & i Holdings Co. Ltd.		64,000		2,506,213
Sony Group Corp.		38,800		3,173,905
Square Enix Holdings Co. Ltd.		16,200		555,043
Sumitomo Mitsui Financial Group, Inc.		49,800		2,441,355
Toyota Industries Corp.		30,500		2,401,071
				29,739,873
Luxembourg — 0.9%
ArcelorMittal SA		57,600		1,440,569
Netherlands — 4.5%
ASML Holding NV		3,500		2,055,337
EXOR NV (a)		6,800		602,773
Heineken Holding NV		22,800		1,715,946
ING Groep NV		75,900		1,002,656
Koninklijke Philips NV (a) (c)		35,809		713,655

MML Foreign Fund —  Portfolio of Investments (Continued)

		Number of Shares		Value
Shell PLC			46,500	$	1,476,376
					7,566,743
Norway — 1.3%
Aker BP ASA			61,973		1,712,752
DNB Bank ASA			23,300		469,294
					2,182,046
Republic of Korea — 1.8%
Samsung Electronics Co. Ltd.			60,700		3,075,363
Singapore — 1.5%
DBS Group Holdings Ltd.			100,600		2,470,182
Sweden — 2.1%
Essity AB Class B			47,600		1,025,794
Husqvarna AB Class B (a)			43,000		327,894
Skandinaviska Enskilda Banken AB Class A			108,000		1,286,399
Volvo AB Class B			41,898		862,456
					3,502,543
Switzerland — 3.8%
ABB Ltd. Registered			46,300		1,654,588
Cie Financiere Richemont SA Registered Class A			12,900		1,571,768
Julius Baer Group Ltd.			15,900		1,018,965
Novartis AG Registered			20,900		2,132,718
					6,378,039
United Kingdom — 19.0%
Ashtead Group PLC			25,200		1,531,721
Aviva PLC			141,176		667,520
Barratt Developments PLC			135,100		724,752
BP PLC			430,900		2,782,255
Bunzl PLC			28,500		1,011,540
Burberry Group PLC			23,200		538,065
CK Hutchison Holdings Ltd.			461,500		2,459,630
CNH Industrial NV			140,700		1,704,533
DCC PLC			34,800		1,950,949
Dowlais Group PLC			178,196		232,909
Entain PLC			84,500		961,787
Inchcape PLC			100,700		927,024
Informa PLC	��		119,200		1,086,193
Kingfisher PLC			171,900		465,956
Legal & General Group PLC			609,700		1,647,233
Liberty Global PLC Class C (a) (c)			37,200		690,432
Lloyds Banking Group PLC			4,364,100		2,349,917
Persimmon PLC			61,100		799,907
Reckitt Benckiser Group PLC			36,900		2,607,738
Smith & Nephew PLC			142,800		1,774,952
Tesco PLC			641,405		2,062,349
Unilever PLC (ULVR LN)			56,800		2,802,974
					31,780,336
United States — 8.0%
GSK PLC			103,300		1,867,425

MML Foreign Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Linde PLC (LIN US)		4,700	$	1,750,045
Nestle SA Registered		25,100		2,834,327
Roche Holding AG		12,800		3,491,394
Sanofi		22,800		2,446,490
Stellantis NV		52,200		1,001,239
				13,390,920
TOTAL COMMON STOCK (Cost $168,653,461)				164,937,310
PREFERRED STOCK — 0.6%
Germany — 0.6%
Henkel AG & Co. KGaA 2.753%		13,100		934,978
TOTAL PREFERRED STOCK (Cost $1,022,756)				934,978
TOTAL EQUITIES (Cost $169,676,217)				165,872,288
TOTAL LONG-TERM INVESTMENTS (Cost $169,676,217)				165,872,288
SHORT-TERM INVESTMENTS — 0.7%
Investment of Cash Collateral from Securities Loaned — 0.7%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		1,107,831		1,107,831
TOTAL SHORT-TERM INVESTMENTS (Cost $1,107,831)				1,107,831
TOTAL INVESTMENTS — 99.9% (Cost $170,784,048) (e)				166,980,119
Other Assets/(Liabilities) — 0.1%				247,990
NET ASSETS — 100.0%			$	167,228,109

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 September 30, 2023, was $3,340,845 or 2.00% of net assets. The Fund received $2,383,266 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) 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 September 30, 2023, the aggregate market value of these securities amounted to $1,687,939 or 1.01% of net assets.

(c) Non-income producing security.

(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

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.1%
COMMON STOCK — 98.1%
Basic Materials — 1.9%
Chemicals — 1.9%
DuPont de Nemours, Inc.		16,253	$	1,212,311
Valvoline, Inc.		44,903		1,447,673
				2,659,984
Communications — 13.0%
Internet — 12.3%
Airbnb, Inc. Class A (a)		5,613		770,160
Alphabet, Inc. Class A (a)		36,265		4,745,638
Amazon.com, Inc. (a)		35,086		4,460,132
Meta Platforms, Inc. Class A (a)		14,241		4,275,291
Netflix, Inc. (a)		4,024		1,519,462
Uber Technologies, Inc. (a)		26,517		1,219,517
				16,990,200
Telecommunications — 0.7%
T-Mobile US, Inc. (a)		7,130		998,556
				17,988,756
Consumer, Cyclical — 4.3%
Auto Manufacturers — 0.3%
Tesla, Inc. (a)		1,408		352,309
Auto Parts & Equipment — 1.1%
Mobileye Global, Inc. Class A (a)		37,736		1,567,931
Retail — 2.9%
Starbucks Corp.		22,717		2,073,381
Walmart, Inc.		11,940		1,909,564
				3,982,945
				5,903,185
Consumer, Non-cyclical — 21.2%
Agriculture — 0.7%
British American Tobacco PLC Sponsored ADR (b)		31,177		979,270
Beverages — 5.1%
Coca-Cola Co.		29,838		1,670,331
Constellation Brands, Inc. Class A		13,749		3,455,536

MML Fundamental Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
PepsiCo, Inc.		11,554	$	1,957,710
				7,083,577
Biotechnology — 1.2%
Gilead Sciences, Inc.		21,395		1,603,341
Commercial Services — 1.3%
Equifax, Inc.		9,448		1,730,685
Cosmetics & Personal Care — 1.5%
Coty, Inc. Class A (a)		70,460		772,946
Kenvue, Inc.		65,297		1,311,164
				2,084,110
Health Care – Products — 2.7%
Boston Scientific Corp. (a)		22,038		1,163,606
Zimmer Biomet Holdings, Inc.		22,946		2,575,000
				3,738,606
Health Care – Services — 3.3%
HCA Healthcare, Inc.		7,814		1,922,088
Tenet Healthcare Corp. (a)		16,992		1,119,603
UnitedHealth Group, Inc.		3,142		1,584,165
				4,625,856
Pharmaceuticals — 5.4%
AstraZeneca PLC Sponsored ADR		22,520		1,525,054
Becton Dickinson & Co.		3,980		1,028,949
Eli Lilly & Co.		5,673		3,047,139
Merck & Co., Inc.		18,518		1,906,428
				7,507,570
				29,353,015
Energy — 4.6%
Oil & Gas — 3.7%
Exxon Mobil Corp.		43,021		5,058,409
Oil & Gas Services — 0.9%
Schlumberger NV		21,392		1,247,154
				6,305,563
Financial — 15.9%
Banks — 3.6%
Columbia Banking System, Inc.		18,869		383,041
JP Morgan Chase & Co.		31,572		4,578,571
				4,961,612
Diversified Financial Services — 6.6%
American Express Co.		15,953		2,380,028
Charles Schwab Corp.		49,401		2,712,115
Intercontinental Exchange, Inc.		11,612		1,277,552
Mastercard, Inc. Class A		6,207		2,457,414

MML Fundamental Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Rocket Cos., Inc. Class A (a)		36,144	$	295,658
				9,122,767
Insurance — 3.1%
American International Group, Inc.		11,422		692,173
Arthur J Gallagher & Co.		5,916		1,348,434
Equitable Holdings, Inc.		81,824		2,322,983
				4,363,590
Real Estate Investment Trusts (REITS) — 2.6%
Prologis, Inc.		32,050		3,596,331
				22,044,300
Industrial — 8.6%
Aerospace & Defense — 2.1%
Boeing Co. (a)		15,036		2,882,101
Building Materials — 1.0%
Vulcan Materials Co.		6,860		1,385,857
Electrical Components & Equipment — 0.9%
Emerson Electric Co.		13,358		1,289,982
Electronics — 0.9%
Hubbell, Inc.		3,735		1,170,586
Machinery – Diversified — 1.6%
Deere & Co.		2,052		774,384
Otis Worldwide Corp.		17,092		1,372,658
				2,147,042
Transportation — 2.1%
United Parcel Service, Inc. Class B		19,002		2,961,842
				11,837,410
Technology — 26.5%
Computers — 7.1%
Amdocs Ltd.		16,631		1,405,153
Apple, Inc.		49,143		8,413,773
				9,818,926
Semiconductors — 6.5%
Applied Materials, Inc.		12,260		1,697,397
ARM Holdings PLC ADR (a)		11,507		615,855
NVIDIA Corp.		10,709		4,658,308
QUALCOMM, Inc.		6,669		740,659
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR		15,028		1,305,933
				9,018,152
Software — 12.9%
Fiserv, Inc. (a)		15,474		1,747,943
Manhattan Associates, Inc. (a)		2,903		573,807
Microsoft Corp.		32,521		10,268,506

MML Fundamental Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
ServiceNow, Inc. (a)		4,019	$	2,246,460
Snowflake, Inc. Class A (a)		3,528		538,973
Synopsys, Inc. (a)		3,086		1,416,381
Tyler Technologies, Inc. (a)		2,748		1,061,113
				17,853,183
				36,690,261
Utilities — 2.1%
Electric — 2.1%
Dominion Energy, Inc.		36,741		1,641,220
FirstEnergy Corp.		34,865		1,191,686
				2,832,906
				2,832,906
TOTAL COMMON STOCK (Cost $126,554,215)				135,615,380
TOTAL EQUITIES (Cost $126,554,215)				135,615,380
TOTAL LONG-TERM INVESTMENTS (Cost $126,554,215)				135,615,380
	Principal Amount
SHORT-TERM INVESTMENTS — 1.8%
Repurchase Agreement — 1.8%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (c)	$	2,526,248		2,526,248
TOTAL SHORT-TERM INVESTMENTS (Cost $2,526,248)				2,526,248
TOTAL INVESTMENTS — 99.9% (Cost $129,080,463) (d)				138,141,628
Other Assets/(Liabilities) — 0.1%				150,233
NET ASSETS — 100.0%			$	138,291,861

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 September 30, 2023, was $916,014 or 0.66% of net assets. The Fund received $944,037 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 $2,526,585. Collateralized by U.S. Government Agency obligations with a rate of 0.375%, maturity date of 1/31/26, and an aggregate market value, including accrued interest, of $2,576,860.

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

MML Fundamental Value Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.3%
COMMON STOCK — 99.3%
Basic Materials — 1.3%
Chemicals — 1.3%
DuPont de Nemours, Inc.		19,720	$	1,470,915
Olin Corp.		13,023		650,889
				2,121,804
Communications — 9.9%
Advertising — 0.9%
Omnicom Group, Inc.		18,745		1,396,127
Internet — 4.6%
Alphabet, Inc. Class A (a)		41,629		5,447,571
Booking Holdings, Inc. (a)		430		1,326,098
Match Group, Inc. (a)		14,851		581,788
				7,355,457
Media — 0.6%
Warner Bros Discovery, Inc. (a)		81,409		884,102
Telecommunications — 3.8%
Cisco Systems, Inc.		71,422		3,839,647
T-Mobile US, Inc. (a)		15,758		2,206,908
				6,046,555
				15,682,241
Consumer, Cyclical — 7.9%
Auto Parts & Equipment — 0.6%
BorgWarner, Inc.		24,300		980,991
Distribution & Wholesale — 1.4%
LKQ Corp.		16,715		827,560
WESCO International, Inc.		9,524		1,369,742
				2,197,302
Home Furnishing — 1.2%
Sony Group Corp. Sponsored ADR		15,077		1,242,496
Whirlpool Corp.		5,479		732,542
				1,975,038

MML Fundamental Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Lodging — 0.5%
MGM Resorts International		21,670	$	796,589
Retail — 4.2%
AutoZone, Inc. (a)		1,193		3,030,208
Ulta Beauty, Inc. (a)		2,023		808,087
Walmart, Inc.		17,676		2,826,923
				6,665,218
				12,615,138
Consumer, Non-cyclical — 24.6%
Agriculture — 1.7%
Philip Morris International, Inc.		29,174		2,700,929
Beverages — 2.3%
Coca-Cola Europacific Partners PLC		20,368		1,272,593
Keurig Dr Pepper, Inc.		73,297		2,313,986
				3,586,579
Biotechnology — 1.6%
Amgen, Inc.		7,242		1,946,360
Corteva, Inc.		11,739		600,567
				2,546,927
Commercial Services — 3.9%
FleetCor Technologies, Inc. (a)		7,310		1,866,536
Global Payments, Inc.		18,077		2,085,905
United Rentals, Inc.		4,951		2,201,066
				6,153,507
Cosmetics & Personal Care — 0.5%
Kenvue, Inc.		39,050		784,124
Food — 1.1%
US Foods Holding Corp. (a)		42,853		1,701,264
Health Care – Products — 1.1%
Avantor, Inc. (a)		85,040		1,792,643
Health Care – Services — 4.1%
Centene Corp. (a)		25,295		1,742,320
ICON PLC (a)		8,182		2,014,817
UnitedHealth Group, Inc.		5,595		2,820,943
				6,578,080
Pharmaceuticals — 8.3%
Bristol-Myers Squibb Co.		71,054		4,123,974
Cencora, Inc.		11,626		2,092,331
Cigna Group		7,899		2,259,667
McKesson Corp.		3,922		1,705,482

MML Fundamental Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Sanofi ADR		56,390	$	3,024,760
				13,206,214
				39,050,267
Energy — 12.1%
Coal — 1.1%
Peabody Energy Corp.		32,906		855,227
Teck Resources Ltd. Class B		20,338		876,365
				1,731,592
Oil & Gas — 8.4%
BP PLC Sponsored ADR		46,058		1,783,366
Canadian Natural Resources Ltd.		36,486		2,359,550
Cenovus Energy, Inc. (b)		124,982		2,602,125
ConocoPhillips		19,464		2,331,787
Marathon Petroleum Corp.		18,786		2,843,073
Pioneer Natural Resources Co.		6,002		1,377,759
				13,297,660
Oil & Gas Services — 2.6%
Halliburton Co.		40,664		1,646,892
Schlumberger NV		42,241		2,462,650
				4,109,542
				19,138,794
Financial — 19.0%
Banks — 8.6%
Goldman Sachs Group, Inc.		5,989		1,937,861
JP Morgan Chase & Co.		41,102		5,960,612
Morgan Stanley		34,332		2,803,894
Wells Fargo & Co.		70,153		2,866,452
				13,568,819
Diversified Financial Services — 2.8%
American Express Co.		8,159		1,217,241
Discover Financial Services		22,384		1,939,126
Intercontinental Exchange, Inc.		11,775		1,295,486
				4,451,853
Insurance — 7.1%
Aon PLC Class A		2,777		900,359
Arthur J Gallagher & Co.		6,452		1,470,604
Berkshire Hathaway, Inc. Class B (a)		16,794		5,882,938
Chubb Ltd.		9,142		1,903,182
Progressive Corp.		8,525		1,187,532
				11,344,615
Private Equity — 0.5%
Ares Management Corp. Class A		7,439		765,250
				30,130,537

MML Fundamental Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Industrial — 12.8%
Aerospace & Defense — 3.9%
General Dynamics Corp.		10,879	$	2,403,932
Howmet Aerospace, Inc.		34,819		1,610,379
RTX Corp.		30,570		2,200,123
				6,214,434
Building Materials — 2.4%
CRH PLC (b)		31,217		1,708,506
Masco Corp.		20,347		1,087,547
Mohawk Industries, Inc. (a)		11,771		1,010,070
				3,806,123
Electronics — 1.8%
Allegion PLC		10,732		1,118,274
Fortive Corp.		22,860		1,695,298
				2,813,572
Engineering & Construction — 0.3%
Jacobs Solutions, Inc.		4,201		573,437
Machinery – Construction & Mining — 0.5%
Caterpillar, Inc.		2,802		764,946
Machinery – Diversified — 2.9%
Deere & Co.		3,519		1,328,000
Dover Corp.		7,080		987,731
Otis Worldwide Corp.		11,594		931,114
Westinghouse Air Brake Technologies Corp.		12,242		1,300,957
				4,547,802
Miscellaneous - Manufacturing — 1.0%
Eaton Corp. PLC		7,271		1,550,759
				20,271,073
Technology — 10.4%
Computers — 3.0%
Cognizant Technology Solutions Corp. Class A		21,493		1,455,936
Dell Technologies, Inc. Class C		28,102		1,936,228
Leidos Holdings, Inc.		14,317		1,319,454
				4,711,618
Semiconductors — 6.3%
Advanced Micro Devices, Inc. (a)		17,383		1,787,320
Applied Materials, Inc.		13,573		1,879,182
Lam Research Corp.		1,512		947,676
Microchip Technology, Inc.		22,571		1,761,667
Micron Technology, Inc.		27,399		1,863,954
NXP Semiconductors NV		2,092		418,233

MML Fundamental Value Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
QUALCOMM, Inc.		11,904	$	1,322,058
				9,980,090
Software — 1.1%
SS&C Technologies Holdings, Inc.		21,068		1,106,913
Take-Two Interactive Software, Inc. (a)		5,141		721,745
				1,828,658
				16,520,366
Utilities — 1.3%
Electric — 1.3%
CenterPoint Energy, Inc.		28,992		778,435
FirstEnergy Corp.		35,906		1,227,267
				2,005,702
TOTAL COMMON STOCK (Cost $132,810,142)				157,535,922
TOTAL EQUITIES (Cost $132,810,142)				157,535,922
TOTAL LONG-TERM INVESTMENTS (Cost $132,810,142)				157,535,922
SHORT-TERM INVESTMENTS — 1.5%
Investment of Cash Collateral from Securities Loaned — 0.2%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		337,413		337,413
	Principal Amount
Repurchase Agreement — 1.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (d)	$	2,039,734		2,039,734
TOTAL SHORT-TERM INVESTMENTS (Cost $2,377,147)				2,377,147
TOTAL INVESTMENTS — 100.8% (Cost $135,187,289) (e)				159,913,069
Other Assets/(Liabilities) — (0.8)%				(1,241,366)
NET ASSETS — 100.0%			$	158,671,703

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 September 30, 2023, was $329,891 or 0.21% of net assets. (Note 2).

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

(d) Maturity value of $2,040,006. Collateralized by U.S. Government Agency obligations with a rate of 0.625%, maturity date of 1/15/26, and an aggregate market value, including accrued interest, of $2,080,555.

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

MML Global Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.0%
COMMON STOCK — 99.0%
Austria — 0.5%
Erste Group Bank AG		18,785	$	648,931
Canada — 3.5%
Canadian National Railway Co. (a)		17,467		1,892,200
Canadian Pacific Kansas City Ltd. (a)		32,490		2,417,581
				4,309,781
Denmark — 0.5%
Carlsberg AS Class B		4,746		598,049
France — 8.0%
Air Liquide SA		7,474		1,259,496
Danone SA		30,082		1,657,395
EssilorLuxottica SA		2,893		502,883
Hermes International SCA		285		518,100
Legrand SA		17,179		1,576,633
LVMH Moet Hennessy Louis Vuitton SE		3,455		2,606,544
Pernod Ricard SA		9,477		1,577,550
				9,698,601
Germany — 3.9%
Bayer AG Registered		24,409		1,172,362
Brenntag SE		7,713		598,954
Deutsche Boerse AG		3,771		651,800
Merck KGaA		10,938		1,828,187
MTU Aero Engines AG		2,613		474,747
				4,726,050
Israel — 1.2%
Check Point Software Technologies Ltd. (b)		11,363		1,514,461
Japan — 2.5%
Hoya Corp.		4,800		494,657
Kubota Corp.		86,300		1,276,540
Olympus Corp.		100,600		1,303,381
				3,074,578
Mexico — 0.3%
Grupo Financiero Banorte SAB de CV Class O		46,619		390,741
Netherlands — 2.3%
Akzo Nobel NV		14,149		1,021,056

MML Global Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Heineken NV		19,759	$	1,738,151
				2,759,207
Republic of Korea — 1.1%
Samsung Electronics Co. Ltd.		26,793		1,357,466
Spain — 1.4%
Aena SME SA (c)		7,026		1,056,824
Cellnex Telecom SA (c)		18,902		657,249
				1,714,073
Sweden — 1.1%
Essity AB Class B		62,296		1,342,497
Switzerland — 4.6%
Adecco Group AG Registered		8,203		336,476
Cie Financiere Richemont SA Registered Class A		14,477		1,763,913
Julius Baer Group Ltd.		8,874		568,698
Sonova Holding AG Registered		2,808		665,435
UBS Group AG Registered		92,273		2,280,782
				5,615,304
United Kingdom — 7.8%
Burberry Group PLC		33,885		785,877
Compass Group PLC		28,976		705,906
Diageo PLC		63,873		2,355,561
Intertek Group PLC		15,086		754,346
London Stock Exchange Group PLC		9,253		928,880
Reckitt Benckiser Group PLC		22,974		1,623,581
Rolls-Royce Holdings PLC (b)		381,342		1,022,248
Whitbread PLC		14,509		610,342
WPP PLC		76,956		685,819
				9,472,560
United States — 60.3%
3M Co.		9,947		931,238
Abbott Laboratories		16,703		1,617,685
Accenture PLC Class A		9,886		3,036,089
Alphabet, Inc. Class A (b)		20,360		2,664,310
American Express Co.		9,964		1,486,529
Amphenol Corp. Class A		11,053		928,341
Aon PLC Class A		5,501		1,783,534
Aptiv PLC (b)		4,727		466,035
Boston Scientific Corp. (b)		40,180		2,121,504
Carrier Global Corp.		7,560		417,312
Charles Schwab Corp.		39,214		2,152,849
Cognizant Technology Solutions Corp. Class A		19,000		1,287,060
Comcast Corp. Class A		72,763		3,226,311
Cooper Cos., Inc.		3,276		1,041,801
eBay, Inc.		20,142		888,061
Equifax, Inc.		4,531		829,988
Experian PLC		22,670		740,610
Fidelity National Information Services, Inc.		17,519		968,275
Fiserv, Inc. (b)		11,551		1,304,801
Goldman Sachs Group, Inc.		6,652		2,152,388
Honeywell International, Inc.		14,082		2,601,509

MML Global Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
International Flavors & Fragrances, Inc.		20,319	$	1,385,146
Liberty Broadband Corp. Class C (b)		17,465		1,594,904
Linde PLC (LIN US)		9,387		3,495,249
Marriott International, Inc. Class A		4,593		902,800
Medtronic PLC		38,574		3,022,659
Microchip Technology, Inc.		9,032		704,948
Nestle SA Registered		23,141		2,613,114
Omnicom Group, Inc.		4,262		317,434
Oracle Corp.		22,528		2,386,166
Otis Worldwide Corp.		8,751		702,793
PayPal Holdings, Inc. (b)		6,181		361,341
PPG Industries, Inc.		9,858		1,279,568
Roche Holding AG		10,319		2,814,664
Schneider Electric SE		21,151		3,487,012
Stryker Corp.		4,525		1,236,547
Thermo Fisher Scientific, Inc.		6,188		3,132,180
Union Pacific Corp.		7,128		1,451,475
United Parcel Service, Inc. Class B		7,024		1,094,831
Visa, Inc. Class A		15,976		3,674,640
Walt Disney Co. (b)		15,851		1,284,723
Waters Corp. (b)		5,732		1,571,772
Willis Towers Watson PLC		11,125		2,324,680
				73,484,876
TOTAL COMMON STOCK (Cost $108,729,230)				120,707,175
TOTAL EQUITIES (Cost $108,729,230)				120,707,175
WARRANTS — 0.1%
Switzerland — 0.1%
Cie Financiere Richemont SA, Expires 11/22/23, Strike 67.00 (b)		105,484		78,339
TOTAL WARRANTS (Cost $0)				78,339
TOTAL LONG-TERM INVESTMENTS (Cost $108,729,230)				120,785,514
SHORT-TERM INVESTMENTS — 4.2%
Investment of Cash Collateral from Securities Loaned — 3.6%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		4,355,306		4,355,306
	Principal Amount
Repurchase Agreement — 0.6%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (e)	$	801,340		801,340
TOTAL SHORT-TERM INVESTMENTS (Cost $5,156,646)				5,156,646

MML Global Fund —  Portfolio of Investments (Continued)

	Principal Amount	Value
TOTAL INVESTMENTS — 103.3% (Cost $113,885,876) (f)		$	125,942,160
Other Assets/(Liabilities) — (3.3)%			(4,031,992)
NET ASSETS — 100.0%		$	121,910,168

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 September 30, 2023, was $4,266,640 or 3.50% of net assets. (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 September 30, 2023, the aggregate market value of these securities amounted to $1,714,073 or 1.41% of net assets.

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

(e) Maturity value of $801,447. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $817,406.

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

MML Income & Growth Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 97.9%
COMMON STOCK — 97.9%
Basic Materials — 6.8%
Chemicals — 6.8%
Air Products & Chemicals, Inc.		12,910	$	3,658,694
Axalta Coating Systems Ltd. (a)		46,011		1,237,696
DuPont de Nemours, Inc.		45,309		3,379,598
Element Solutions, Inc.		52,879		1,036,957
International Flavors & Fragrances, Inc.		18,659		1,271,984
				10,584,929
Communications — 3.8%
Internet — 0.9%
Alphabet, Inc. Class C (a)		10,600		1,397,610
Media — 2.5%
Comcast Corp. Class A		86,066		3,816,167
Telecommunications — 0.4%
T-Mobile US, Inc. (a)		4,863		681,063
				5,894,840
Consumer, Cyclical — 5.6%
Auto Parts & Equipment — 0.7%
Aptiv PLC (a)		11,141		1,098,391
Entertainment — 0.8%
Marriott Vacations Worldwide Corp.		5,628		566,346
SeaWorld Entertainment, Inc. (a)		14,213		657,351
				1,223,697
Food Services — 0.7%
Aramark		31,898		1,106,861
Home Furnishing — 0.4%
SharkNinja, Inc. (a) (b)		14,603		676,995
Lodging — 1.6%
Las Vegas Sands Corp.		27,981		1,282,649
Wynn Resorts Ltd.		12,892		1,191,350
				2,473,999
Retail — 1.4%
AutoNation, Inc. (a)		5,094		771,232

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

	Number of Shares		Value
Dollar General Corp.		5,868	$	620,834
Lithia Motors, Inc.		2,928		864,726
				2,256,792
				8,836,735
Consumer, Non-cyclical — 24.5%
Agriculture — 3.2%
Philip Morris International, Inc.		53,364		4,940,439
Beverages — 2.5%
Coca-Cola Europacific Partners PLC		43,996		2,748,870
Molson Coors Beverage Co. Class B		18,896		1,201,597
				3,950,467
Commercial Services — 0.5%
U-Haul Holding Co. (UHAL/B US)		15,270		799,995
Cosmetics & Personal Care — 1.0%
Procter & Gamble Co.		10,607		1,547,137
Food — 0.5%
Tyson Foods, Inc. Class A		15,165		765,681
Health Care – Products — 4.1%
Avantor, Inc. (a)		57,182		1,205,396
LivaNova PLC (a)		11,876		628,003
Medtronic PLC		43,886		3,438,907
Smith & Nephew PLC ADR Sponsored ADR		47,419		1,174,569
				6,446,875
Health Care – Services — 4.1%
Elevance Health, Inc.		2,301		1,001,901
Humana, Inc.		3,261		1,586,542
UnitedHealth Group, Inc.		7,684		3,874,196
				6,462,639
Pharmaceuticals — 8.6%
Cigna Group		12,124		3,468,313
CVS Health Corp.		53,811		3,757,084
Johnson & Johnson		13,153		2,048,580
Merck & Co., Inc.		40,253		4,144,046
				13,418,023
				38,331,256
Energy — 10.1%
Oil & Gas — 6.3%
Hess Corp.		27,110		4,147,830
Phillips 66		34,513		4,146,737
Pioneer Natural Resources Co.		6,601		1,515,260
				9,809,827

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

	Number of Shares		Value
Oil & Gas Services — 0.8%
Halliburton Co.		33,300	$	1,348,650
Pipelines — 3.0%
Enbridge, Inc.		94,490		3,136,123
Plains GP Holdings LP Class A		92,743		1,495,017
				4,631,140
				15,789,617
Financial — 20.1%
Banks — 7.6%
JP Morgan Chase & Co.		13,922		2,018,968
M&T Bank Corp.		17,221		2,177,595
Northern Trust Corp.		30,976		2,152,213
US Bancorp		64,648		2,137,263
Wells Fargo & Co.		82,500		3,370,950
				11,856,989
Diversified Financial Services — 1.2%
AerCap Holdings NV (a)		19,585		1,227,392
American Express Co.		4,423		659,867
				1,887,259
Insurance — 7.3%
Allstate Corp.		33,806		3,766,326
American International Group, Inc.		17,372		1,052,743
Axis Capital Holdings Ltd.		14,203		800,623
Berkshire Hathaway, Inc. Class B (a)		3,065		1,073,670
Chubb Ltd.		16,945		3,527,610
Willis Towers Watson PLC		5,408		1,130,056
				11,351,028
Real Estate — 0.6%
Howard Hughes Holdings, Inc. (a)		13,323		987,634
Real Estate Investment Trusts (REITS) — 3.4%
COPT Defense Properties		57,144		1,361,742
Public Storage		9,160		2,413,843
VICI Properties, Inc.		52,797		1,536,393
				5,311,978
				31,394,888
Industrial — 12.1%
Aerospace & Defense — 2.6%
General Dynamics Corp.		9,570		2,114,683
RTX Corp.		28,337		2,039,414
				4,154,097
Building Materials — 2.0%
CRH PLC		24,830		1,358,946
Knife River Corp. (a)		16,954		827,864

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

	Number of Shares		Value
MDU Resources Group, Inc.		45,966	$	900,014
				3,086,824
Engineering & Construction — 0.7%
AECOM		13,296		1,104,100
Hand & Machine Tools — 2.1%
Stanley Black & Decker, Inc.		39,351		3,288,957
Machinery – Construction & Mining — 3.3%
BWX Technologies, Inc.		20,432		1,531,991
Vertiv Holdings Co.		96,488		3,589,354
				5,121,345
Machinery – Diversified — 0.5%
Deere & Co.		1,940		732,117
Transportation — 0.9%
JB Hunt Transport Services, Inc.		7,308		1,377,704
				18,865,144
Technology — 10.0%
Computers — 1.5%
CACI International, Inc. Class A (a)		3,715		1,166,250
Cognizant Technology Solutions Corp. Class A		17,726		1,200,759
				2,367,009
Semiconductors — 3.9%
Broadcom, Inc.		2,417		2,007,512
Microchip Technology, Inc.		12,730		993,576
QUALCOMM, Inc.		10,616		1,179,013
Skyworks Solutions, Inc.		18,739		1,847,478
				6,027,579
Software — 4.6%
Electronic Arts, Inc.		9,633		1,159,813
Fidelity National Information Services, Inc.		56,140		3,102,858
Oracle Corp.		27,769		2,941,293
				7,203,964
				15,598,552
Utilities — 4.9%
Electric — 4.9%
CenterPoint Energy, Inc.		36,805		988,214
Entergy Corp.		33,985		3,143,612
Exelon Corp.		23,763		898,004

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

	Number of Shares		Value
Pinnacle West Capital Corp.		36,285	$	2,673,479
				7,703,309
TOTAL COMMON STOCK (Cost $135,260,005)				152,999,270
TOTAL EQUITIES (Cost $135,260,005)				152,999,270
TOTAL LONG-TERM INVESTMENTS (Cost $135,260,005)				152,999,270
SHORT-TERM INVESTMENTS — 0.3%
Investment of Cash Collateral from Securities Loaned — 0.1%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		96,520		96,520
	Principal Amount
Repurchase Agreement — 0.2%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (d)	$	318,898		318,898
TOTAL SHORT-TERM INVESTMENTS (Cost $415,418)				415,418
TOTAL INVESTMENTS — 98.2% (Cost $135,675,423) (e)				153,414,688
Other Assets/(Liabilities) — 1.8%				2,785,595
NET ASSETS — 100.0%			$	156,200,283

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 September 30, 2023, was $94,204 or 0.06% of net assets. (Note 2).

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

(d) Maturity value of $318,941. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $325,325.

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

MML International Equity Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.0%
COMMON STOCK — 97.4%
Australia — 1.2%
Glencore PLC		245,844	$	1,405,935
Rio Tinto PLC		21,473		1,348,872
				2,754,807
Belgium — 1.0%
Anheuser-Busch InBev SA		21,500		1,183,965
KBC Group NV		15,300		953,916
				2,137,881
Canada — 3.3%
Canadian National Railway Co. (a)		18,577		2,012,447
Intact Financial Corp.		7,632		1,112,673
Open Text Corp.		36,900		1,295,066
Suncor Energy, Inc.		38,114		1,310,734
Toronto-Dominion Bank (a)		28,245		1,701,666
				7,432,586
China — 2.9%
Alibaba Group Holding Ltd. (b)		113,940		1,235,269
NetEase, Inc.		62,800		1,260,745
Prosus NV (PRX NA) (b)		52,516		1,547,624
Tencent Holdings Ltd.		33,400		1,294,419
Vipshop Holdings Ltd. ADR (b)		17,851		285,794
Yum China Holdings, Inc.		17,763		989,754
				6,613,605
Denmark — 2.3%
Carlsberg AS Class B		9,442		1,189,796
DSV AS		3,220		600,309
Novo Nordisk AS		37,977		3,454,610
				5,244,715
France — 16.0%
Accor SA		38,800		1,306,401
Air Liquide SA		26,991		4,548,442
BNP Paribas SA		38,476		2,449,495
Capgemini SE		26,010		4,516,343
Cie de Saint-Gobain SA		27,772		1,663,780
Cie Generale des Etablissements Michelin SCA		34,153		1,046,783
Danone SA		18,800		1,035,803
Dassault Systemes SE		21,675		805,849
Edenred SE		11,800		737,268
Engie SA		136,738		2,096,659

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
EssilorLuxottica SA		13,160	$	2,287,571
Kering SA		4,030		1,832,287
L'Oreal SA		3,079		1,275,135
Legrand SA		15,599		1,431,625
LVMH Moet Hennessy Louis Vuitton SE		4,755		3,587,299
Pernod Ricard SA		12,938		2,153,671
Publicis Groupe SA		13,251		1,000,672
Valeo SE		57,784		989,883
Worldline SA (b) (c)		52,300		1,462,429
				36,227,395
Germany — 15.1%
adidas AG		6,100		1,073,990
Allianz SE Registered		7,385		1,761,038
Bayer AG Registered		80,818		3,881,681
Bayerische Motoren Werke AG		15,700		1,599,193
Beiersdorf AG		22,930		2,960,819
Brenntag SE		11,800		916,330
Continental AG		25,320		1,788,913
Daimler Truck Holding AG		46,090		1,598,424
Deutsche Boerse AG		14,779		2,554,481
Fresenius Medical Care AG & Co. KGaA		38,300		1,654,215
Fresenius SE & Co. KGaA		58,500		1,823,579
Henkel AG & Co. KGaA		12,900		814,617
Mercedes-Benz Group AG Registered		30,998		2,159,076
Merck KGaA		14,869		2,485,218
MTU Aero Engines AG		4,128		750,003
SAP SE		34,371		4,461,562
Siemens AG Registered		8,425		1,207,836
thyssenkrupp AG		83,574		638,247
				34,129,222
Hong Kong — 2.4%
AIA Group Ltd.		324,800		2,627,329
Prudential PLC		263,780		2,840,415
				5,467,744
India — 1.2%
Axis Bank Ltd.		57,582		715,504
HDFC Bank Ltd. ADR		33,459		1,974,416
				2,689,920
Indonesia — 0.1%
Bank Mandiri Persero Tbk PT		293,000		114,225
Ireland — 1.4%
Ryanair Holdings PLC Sponsored ADR (b)		33,481		3,254,688
Israel — 0.9%
Check Point Software Technologies Ltd. (b)		15,427		2,056,111
Italy — 2.8%
Eni SpA (a)		125,809		2,020,676
Intesa Sanpaolo SpA		1,633,161		4,196,891
				6,217,567

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Japan — 10.6%
Daikin Industries Ltd.		13,600	$	2,133,639
Denso Corp.		121,600		1,951,637
Fujitsu Ltd.		8,800		1,035,380
Hitachi Ltd.		52,900		3,279,501
Hoya Corp.		12,100		1,246,948
Koito Manufacturing Co. Ltd.		37,100		559,624
Komatsu Ltd.		28,700		775,607
Kose Corp.		10,200		739,432
Kubota Corp.		44,200		653,801
Kyocera Corp.		32,600		1,653,399
Mitsubishi Electric Corp.		84,500		1,044,677
Olympus Corp.		104,700		1,356,501
Recruit Holdings Co. Ltd.		26,100		803,736
Seven & i Holdings Co. Ltd.		18,800		736,200
Shin-Etsu Chemical Co. Ltd.		32,300		937,488
SMC Corp.		3,500		1,566,711
Sony Group Corp.		25,400		2,077,763
Terumo Corp.		46,700		1,237,180
ZOZO, Inc. (a)		15,500		284,295
				24,073,519
Luxembourg — 0.4%
Eurofins Scientific SE		16,900		952,864
Netherlands — 2.3%
Akzo Nobel NV		9,035		652,006
EXOR NV (a)		15,770		1,397,901
ING Groep NV		179,101		2,365,965
Randstad NV		14,915		822,142
				5,238,014
Portugal — 0.6%
Galp Energia SGPS SA		93,452		1,384,320
Republic of Korea — 1.2%
NAVER Corp.		10,435		1,557,194
Samsung Electronics Co. Ltd. GDR (c)		845		1,062,900
				2,620,094
Singapore — 0.9%
DBS Group Holdings Ltd.		77,900		1,912,795
Spain — 1.1%
Amadeus IT Group SA		41,821		2,520,288
Sweden — 1.3%
Sandvik AB		30,200		553,689
SKF AB Class B		79,400		1,316,553
Volvo AB Class B		55,870		1,150,064
				3,020,306
Switzerland — 7.4%
Cie Financiere Richemont SA Registered Class A		26,304		3,204,944
Julius Baer Group Ltd.		18,700		1,198,406
Novartis AG Registered		35,574		3,630,111

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Schindler Holding AG		2,910	$	580,035
Sika AG Registered		4,624		1,171,986
Sonova Holding AG Registered		4,457		1,056,212
Swatch Group AG		3,250		833,271
UBS Group AG Registered		116,067		2,868,916
Zurich Insurance Group AG		4,862		2,227,950
				16,771,831
Taiwan — 0.8%
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR		20,686		1,797,613
United Kingdom — 10.9%
Ashtead Group PLC		12,200		741,548
Bunzl PLC		2,400		85,182
CNH Industrial NV		183,753		2,226,106
Compass Group PLC		153,250		3,733,436
Diageo PLC		55,489		2,046,369
Informa PLC		61,300		558,588
Liberty Global PLC Class A (b)		43,300		741,296
Lloyds Banking Group PLC		5,248,284		2,826,020
London Stock Exchange Group PLC		18,709		1,878,138
Reckitt Benckiser Group PLC		19,327		1,365,847
RELX PLC		77,682		2,619,795
Rolls-Royce Holdings PLC (b)		529,237		1,418,704
Schroders PLC		303,817		1,501,626
Smiths Group PLC		22,100		435,452
Tesco PLC		385,312		1,238,917
WPP PLC		146,592		1,306,404
				24,723,428
United States — 9.3%
Experian PLC		67,825		2,215,785
Holcim AG		18,459		1,181,847
Linde PLC (LIN US)		6,132		2,283,250
Nestle SA Registered		44,624		5,039,004
QIAGEN NV (b)		33,745		1,365,728
Roche Holding AG		17,171		4,683,651
Schneider Electric SE		26,003		4,286,927
				21,056,192
TOTAL COMMON STOCK (Cost $232,727,859)				220,411,730
PREFERRED STOCK — 0.6%
Republic of Korea — 0.6%
Samsung Electronics Co. Ltd. 1.989%		30,900		1,247,515
TOTAL PREFERRED STOCK (Cost $1,610,697)				1,247,515
TOTAL EQUITIES (Cost $234,338,556)				221,659,245
TOTAL LONG-TERM INVESTMENTS (Cost $234,338,556)				221,659,245

MML International Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
SHORT-TERM INVESTMENTS — 4.6%
Investment of Cash Collateral from Securities Loaned — 0.9%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		2,040,796	$	2,040,796
	Principal Amount
Repurchase Agreement — 3.7%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (e)	$	8,433,935		8,433,935
TOTAL SHORT-TERM INVESTMENTS (Cost $10,474,731)				10,474,731
TOTAL INVESTMENTS — 102.6% (Cost $244,813,287) (f)				232,133,976
Other Assets/(Liabilities) — (2.6)%				(5,881,885)
NET ASSETS — 100.0%			$	226,252,091

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) Denotes all or a portion of security on loan. The total value of securities on loan as of September 30, 2023, was $6,981,014 or 3.09% of net assets. The Fund received $5,243,637 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 September 30, 2023, the aggregate market value of these securities amounted to $2,525,329 or 1.12% of net assets.

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

(e) Maturity value of $8,435,060. Collateralized by U.S. Government Agency obligations with rates ranging from 0.375% - 0.500%, maturity dates ranging from 1/31/26 - 2/28/26, and an aggregate market value, including accrued interest, of $8,602,649.

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

MML Large Cap Growth Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 98.4%
COMMON STOCK — 98.4%
Communications — 30.7%
Internet — 26.2%
Alibaba Group Holding Ltd. Sponsored ADR (a)		22,450	$	1,947,313
Alphabet, Inc. Class A (a)		54,673		7,154,509
Alphabet, Inc. Class C (a)		40,062		5,282,175
Amazon.com, Inc. (a)		77,592		9,863,495
Meta Platforms, Inc. Class A (a)		48,818		14,655,652
Netflix, Inc. (a)		19,254		7,270,310
Shopify, Inc. Class A (a)		57,156		3,119,003
				49,292,457
Media — 4.5%
FactSet Research Systems, Inc.		7,141		3,122,474
Walt Disney Co. (a)		64,952		5,264,359
				8,386,833
				57,679,290
Consumer, Cyclical — 9.8%
Auto Manufacturers — 6.0%
Tesla, Inc. (a)		44,940		11,244,887
Retail — 3.8%
Starbucks Corp.		38,257		3,491,716
Yum China Holdings, Inc.		21,949		1,222,998
Yum! Brands, Inc.		18,755		2,343,250
				7,057,964
				18,302,851
Consumer, Non-cyclical — 18.4%
Beverages — 3.2%
Monster Beverage Corp. (a)		112,976		5,982,079
Biotechnology — 6.3%
Illumina, Inc. (a)		17,873		2,453,606
Regeneron Pharmaceuticals, Inc. (a)		5,349		4,402,013
Vertex Pharmaceuticals, Inc. (a)		14,377		4,999,458
				11,855,077
Commercial Services — 1.8%
Block, Inc. (a)		34,453		1,524,890

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

	Number of Shares		Value
PayPal Holdings, Inc. (a)		31,250	$	1,826,875
				3,351,765
Health Care – Products — 2.6%
Intuitive Surgical, Inc. (a)		8,274		2,418,407
Thermo Fisher Scientific, Inc.		4,728		2,393,172
				4,811,579
Pharmaceuticals — 4.5%
Novartis AG Sponsored ADR		27,103		2,760,712
Novo Nordisk AS Sponsored ADR		40,742		3,705,077
Roche Holding AG Sponsored ADR		61,653		2,091,886
				8,557,675
				34,558,175
Financial — 6.9%
Diversified Financial Services — 6.9%
SEI Investments Co.		40,676		2,449,916
Visa, Inc. Class A		45,423		10,447,744
				12,897,660
Industrial — 7.1%
Aerospace & Defense — 4.8%
Boeing Co. (a)		46,957		9,000,718
Machinery – Diversified — 0.7%			��
Deere & Co.		3,342		1,261,204
Transportation — 1.6%
Expeditors International of Washington, Inc.		27,101		3,106,587
				13,368,509
Technology — 25.5%
Semiconductors — 9.0%
NVIDIA Corp.		32,241		14,024,513
QUALCOMM, Inc.		26,237		2,913,881
				16,938,394
Software — 16.5%
Autodesk, Inc. (a)		27,331		5,655,057
Microsoft Corp.		28,576		9,022,872
Oracle Corp.		82,172		8,703,658
Salesforce, Inc. (a)		27,442		5,564,689

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

	Number of Shares		Value
Workday, Inc. Class A (a)		9,522	$	2,045,802
				30,992,078
				47,930,472
TOTAL COMMON STOCK (Cost $154,037,908)				184,736,957
TOTAL EQUITIES (Cost $154,037,908)				184,736,957
TOTAL LONG-TERM INVESTMENTS (Cost $154,037,908)				184,736,957
	Principal Amount
SHORT-TERM INVESTMENTS — 1.8%
Repurchase Agreement — 1.8%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (b)	$	3,279,897		3,279,897
TOTAL SHORT-TERM INVESTMENTS (Cost $3,279,897)				3,279,897
TOTAL INVESTMENTS — 100.2% (Cost $157,317,805) (c)				188,016,854
Other Assets/(Liabilities) — (0.2)%				(342,360)
NET ASSETS — 100.0%			$	187,674,494

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 $3,280,335. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26 , and an aggregate market value, including accrued interest, of $3,345,578.

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

MML Managed Volatility Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 97.8%
COMMON STOCK — 97.8%
Basic Materials — 1.9%
Chemicals — 1.5%
Air Products & Chemicals, Inc. (a)		596	$	168,906
Albemarle Corp. (a)		330		56,113
Celanese Corp. (a)		248		31,129
CF Industries Holdings, Inc. (a)		510		43,727
Dow, Inc. (a)		1,821		93,891
DuPont de Nemours, Inc. (a)		1,219		90,925
Eastman Chemical Co. (a)		327		25,088
Ecolab, Inc. (a)		662		112,143
FMC Corp. (a)		313		20,962
International Flavors & Fragrances, Inc. (a)		723		49,287
Linde PLC (LIN US) (a)		1,324		492,991
LyondellBasell Industries NV Class A (a)		693		65,627
Mosaic Co. (a)		859		30,580
PPG Industries, Inc. (a)		637		82,683
Sherwin-Williams Co. (a)		639		162,977
				1,527,029
Forest Products & Paper — 0.0%
International Paper Co. (a)		898		31,852
Iron & Steel — 0.2%
Nucor Corp. (a)		675		105,536
Steel Dynamics, Inc. (a)		443		47,499
				153,035
Mining — 0.2%
Freeport-McMoRan, Inc. (a)		3,859		143,902
Newmont Corp. (a)		2,139		79,036
				222,938
				1,934,854
Communications — 13.4%
Advertising — 0.1%
Interpublic Group of Cos., Inc. (a)		1,066		30,551
Omnicom Group, Inc. (a)		558		41,560
				72,111
Internet — 10.3%
Airbnb, Inc. Class A (a) (b)		1,143		156,831
Alphabet, Inc. Class A (a) (b)		15,982		2,091,405
Alphabet, Inc. Class C (a) (b)		13,687		1,804,631

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Amazon.com, Inc. (a) (b)		24,530	$	3,118,254
Booking Holdings, Inc. (a) (b)		96		296,059
CDW Corp. (a)		348		70,212
eBay, Inc. (a)		1,462		64,460
Etsy, Inc. (a) (b)		321		20,730
Expedia Group, Inc. (a) (b)		370		38,136
F5, Inc. (a) (b)		177		28,522
Gen Digital, Inc. (a)		1,715		30,321
Match Group, Inc. (a) (b)		739		28,950
Meta Platforms, Inc. Class A (a) (b)		5,994		1,799,459
Netflix, Inc. (a) (b)		1,203		454,253
Palo Alto Networks, Inc. (a) (b)		816		191,303
VeriSign, Inc. (a) (b)		242		49,012
				10,242,538
Media — 1.2%
Charter Communications, Inc. Class A (a) (b)		269		118,312
Comcast Corp. Class A (a)		11,233		498,071
FactSet Research Systems, Inc. (a)		97		42,414
Fox Corp. Class A (a)		576		17,971
Fox Corp. Class B (a)		505		14,585
News Corp. Class A (a)		573		11,494
News Corp. Class B (a)		716		14,943
Paramount Global Class B (a)		1,322		17,054
Walt Disney Co. (a) (b)		4,929		399,496
Warner Bros Discovery, Inc. (a) (b)		5,891		63,976
				1,198,316
Telecommunications — 1.8%
Arista Networks, Inc. (a) (b)		672		123,601
AT&T, Inc. (a)		19,522		293,220
Cisco Systems, Inc. (a)		11,091		596,252
Corning, Inc. (a)		2,009		61,214
Juniper Networks, Inc. (a)		826		22,954
Motorola Solutions, Inc. (a)		457		124,414
T-Mobile US, Inc. (a) (b)		1,374		192,429
Verizon Communications, Inc. (a)		11,331		367,238
				1,781,322
				13,294,287
Consumer, Cyclical — 9.0%
Airlines — 0.2%
Alaska Air Group, Inc. (a) (b)		399		14,795
American Airlines Group, Inc. (a) (b)		1,709		21,893
Delta Air Lines, Inc. (a)		1,764		65,268
Southwest Airlines Co. (a)		1,575		42,635
United Airlines Holdings, Inc. (a) (b)		887		37,520
				182,111
Apparel — 0.4%
NIKE, Inc. Class B (a)		3,313		316,789
Ralph Lauren Corp. (a)		120		13,931
Tapestry, Inc. (a)		676		19,435

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
VF Corp. (a)		995	$	17,582
				367,737
Auto Manufacturers — 2.4%
Cummins, Inc. (a)		363		82,931
Ford Motor Co. (a)		10,572		131,304
General Motors Co. (a)		3,719		122,616
PACCAR, Inc. (a)		1,420		120,728
Tesla, Inc. (a) (b)		7,460		1,866,641
				2,324,220
Auto Parts & Equipment — 0.1%
Aptiv PLC (a) (b)		728		71,774
BorgWarner, Inc. (a)		693		27,976
				99,750
Distribution & Wholesale — 0.3%
Copart, Inc. (a) (b)		2,422		104,364
Fastenal Co. (a)		1,520		83,053
LKQ Corp. (a)		671		33,221
Pool Corp. (a)		102		36,322
W.W. Grainger, Inc. (a)		118		81,637
				338,597
Entertainment — 0.1%
Caesars Entertainment, Inc. (a) (b)		584		27,069
Live Nation Entertainment, Inc. (a) (b)		379		31,472
				58,541
Home Builders — 0.3%
DR Horton, Inc. (a)		862		92,639
Lennar Corp. Class A (a)		660		74,072
NVR, Inc. (a) (b)		8		47,706
PulteGroup, Inc. (a)		580		42,949
				257,366
Home Furnishing — 0.0%
Whirlpool Corp. (a)		154		20,590
Leisure Time — 0.1%
Carnival Corp. (a) (b)		2,762		37,894
Norwegian Cruise Line Holdings Ltd. (a) (b)		1,239		20,419
Royal Caribbean Cruises Ltd. (a) (b)		608		56,021
				114,334
Lodging — 0.3%
Hilton Worldwide Holdings, Inc. (a)		741		111,284
Las Vegas Sands Corp. (a)		886		40,614
Marriott International, Inc. Class A (a)		661		129,926
MGM Resorts International (a)		763		28,048
Wynn Resorts Ltd. (a)		273		25,228
				335,100

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Retail — 4.8%
AutoZone, Inc. (a) (b)		49	$	124,460
Bath & Body Works, Inc. (a)		593		20,043
Best Buy Co., Inc. (a)		564		39,181
CarMax, Inc. (a) (b)		410		28,999
Chipotle Mexican Grill, Inc. (a) (b)		74		135,555
Costco Wholesale Corp. (a)		1,198		676,822
Darden Restaurants, Inc. (a)		334		47,836
Dollar General Corp. (a)		589		62,316
Dollar Tree, Inc. (a) (b)		579		61,635
Domino's Pizza, Inc. (a)		103		39,015
Genuine Parts Co. (a)		410		59,196
Home Depot, Inc. (a)		2,707		817,947
Lowe's Cos., Inc. (a)		1,571		326,517
McDonald's Corp. (a)		1,973		519,767
O'Reilly Automotive, Inc. (a) (b)		168		152,689
Ross Stores, Inc. (a)		911		102,897
Starbucks Corp. (a)		3,087		281,751
Target Corp. (a)		1,285		142,082
TJX Cos., Inc. (a)		3,144		279,439
Tractor Supply Co. (a)		284		57,666
Ulta Beauty, Inc. (a) (b)		136		54,325
Walgreens Boots Alliance, Inc. (a)		1,900		42,256
Walmart, Inc. (a)		3,797		607,254
Yum! Brands, Inc. (a)		786		98,203
				4,777,851
Toys, Games & Hobbies — 0.0%
Hasbro, Inc. (a)		336		22,223
				8,898,420
Consumer, Non-cyclical — 19.6%
Agriculture — 0.8%
Altria Group, Inc. (a)		4,886		205,457
Archer-Daniels-Midland Co. (a)		1,453		109,585
Bunge Ltd. (a)		392		42,434
Philip Morris International, Inc. (a)		4,252		393,650
				751,126
Beverages — 1.6%
Brown-Forman Corp. Class B (a)		476		27,460
Coca-Cola Co. (a)		10,488		587,118
Constellation Brands, Inc. Class A (a)		455		114,355
Keurig Dr Pepper, Inc. (a)		2,411		76,115
Molson Coors Beverage Co. Class B (a)		488		31,032
Monster Beverage Corp. (a) (b)		1,970		104,312
PepsiCo, Inc. (a)		3,715		629,470
				1,569,862
Biotechnology — 1.5%
Amgen, Inc. (a)		1,443		387,821
Bio-Rad Laboratories, Inc. Class A (a) (b)		62		22,224
Biogen, Inc. (a) (b)		385		98,949
Corteva, Inc. (a)		2,004		102,525

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Gilead Sciences, Inc. (a)		3,364	$	252,098
Illumina, Inc. (a) (b)		423		58,069
Incyte Corp. (a) (b)		544		31,427
Moderna, Inc. (a) (b)		898		92,754
Regeneron Pharmaceuticals, Inc. (a) (b)		286		235,367
Vertex Pharmaceuticals, Inc. (a) (b)		703		244,461
				1,525,695
Commercial Services — 1.7%
Automatic Data Processing, Inc. (a)		1,111		267,284
Cintas Corp. (a)		243		116,886
CoStar Group, Inc. (a) (b)		1,145		88,039
Equifax, Inc. (a)		337		61,732
FleetCor Technologies, Inc. (a) (b)		203		51,834
Gartner, Inc. (a) (b)		213		73,189
Global Payments, Inc. (a)		698		80,542
MarketAxess Holdings, Inc. (a)		111		23,714
Moody's Corp. (a)		419		132,475
PayPal Holdings, Inc. (a) (b)		3,002		175,497
Quanta Services, Inc. (a)		415		77,634
Robert Half, Inc. (a)		262		19,199
Rollins, Inc. (a)		571		21,315
S&P Global, Inc. (a)		875		319,734
United Rentals, Inc. (a)		186		82,690
Verisk Analytics, Inc. (a)		398		94,024
				1,685,788
Cosmetics & Personal Care — 1.3%
Colgate-Palmolive Co. (a)		2,281		162,202
Estee Lauder Cos., Inc. Class A (a)		618		89,332
Kenvue, Inc. (a)		4,599		92,348
Procter & Gamble Co. (a)		6,392		932,337
				1,276,219
Food — 1.0%
Campbell Soup Co. (a)		536		22,019
Conagra Brands, Inc. (a)		1,222		33,507
General Mills, Inc. (a)		1,562		99,952
Hershey Co. (a)		412		82,433
Hormel Foods Corp. (a)		709		26,963
J. M. Smucker Co. (a)		267		32,817
Kellogg Co. (a)		720		42,847
Kraft Heinz Co. (a)		2,309		77,675
Kroger Co. (a)		1,797		80,416
Lamb Weston Holdings, Inc. (a)		410		37,909
McCormick & Co., Inc. (a)		725		54,839
Mondelez International, Inc. Class A (a)		3,694		256,364
Sysco Corp. (a)		1,386		91,545
Tyson Foods, Inc. Class A (a)		771		38,928
				978,214
Health Care – Products — 3.4%
Abbott Laboratories (a)		4,702		455,389
Align Technology, Inc. (a) (b)		196		59,843
Baxter International, Inc. (a)		1,340		50,572
Bio-Techne Corp. (a)		443		30,155

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Boston Scientific Corp. (a) (b)		3,855	$	203,544
Cooper Cos., Inc. (a)		134		42,613
Danaher Corp. (a)		1,793		444,843
DENTSPLY SIRONA, Inc. (a)		591		20,189
Edwards Lifesciences Corp. (a) (b)		1,647		114,104
GE HealthCare Technologies, Inc. (a) (b)		1,010		68,720
Hologic, Inc. (a) (b)		657		45,596
IDEXX Laboratories, Inc. (a) (b)		221		96,637
Insulet Corp. (a) (b)		193		30,782
Intuitive Surgical, Inc. (a) (b)		945		276,214
Medtronic PLC (a)		3,654		286,327
ResMed, Inc. (a)		393		58,113
Revvity, Inc. (a)		326		36,088
Steris PLC (a)		281		61,657
Stryker Corp. (a)		926		253,048
Teleflex, Inc. (a)		134		26,319
Thermo Fisher Scientific, Inc. (a)		1,042		527,429
Waters Corp. (a) (b)		143		39,212
West Pharmaceutical Services, Inc. (a)		207		77,668
Zimmer Biomet Holdings, Inc. (a)		547		61,384
				3,366,446
Health Care – Services — 2.3%
Catalent, Inc. (a) (b)		476		21,672
Centene Corp. (a) (b)		1,512		104,147
Charles River Laboratories International, Inc. (a) (b)		154		30,181
DaVita, Inc. (a) (b)		138		13,045
Elevance Health, Inc. (a)		638		277,798
HCA Healthcare, Inc. (a)		532		130,861
Humana, Inc. (a)		333		162,011
IQVIA Holdings, Inc. (a) (b)		494		97,195
Laboratory Corp. of America Holdings (a)		226		45,437
Molina Healthcare, Inc. (a) (b)		161		52,790
Quest Diagnostics, Inc. (a)		315		38,386
UnitedHealth Group, Inc. (a)		2,497		1,258,963
Universal Health Services, Inc. Class B (a)		182		22,883
				2,255,369
Household Products & Wares — 0.2%
Avery Dennison Corp. (a)		234		42,745
Church & Dwight Co., Inc. (a)		622		56,994
Clorox Co. (a)		320		41,939
Kimberly-Clark Corp. (a)		889		107,435
				249,113
Pharmaceuticals — 5.8%
AbbVie, Inc. (a)		4,777		712,060
Becton Dickinson & Co. (a)		788		203,722
Bristol-Myers Squibb Co. (a)		5,664		328,738
Cardinal Health, Inc. (a)		671		58,256
Cencora, Inc. (a)		452		81,346
Cigna Group (a)		807		230,858
CVS Health Corp. (a)		3,508		244,929
Dexcom, Inc. (a) (b)		1,044		97,405
Eli Lilly & Co. (a)		2,152		1,155,904
Henry Schein, Inc. (a) (b)		327		24,280

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Johnson & Johnson (a)		6,486	$	1,010,194
McKesson Corp. (a)		368		160,025
Merck & Co., Inc. (a)		6,867		706,958
Organon & Co. (a)		703		12,204
Pfizer, Inc. (a)		15,260		506,174
Viatris, Inc. (a)		3,538		34,885
Zoetis, Inc. (a)		1,244		216,431
				5,784,369
				19,442,201
Energy — 4.7%
Energy – Alternate Sources — 0.1%
Enphase Energy, Inc. (a) (b)		375		45,056
First Solar, Inc. (a) (b)		267		43,145
SolarEdge Technologies, Inc. (a) (b)		150		19,426
				107,627
Oil & Gas — 3.9%
APA Corp. (a)		881		36,209
Chevron Corp. (a)		4,774		804,992
ConocoPhillips (a)		3,251		389,470
Coterra Energy, Inc. (a)		1,971		53,315
Devon Energy Corp. (a)		1,807		86,194
Diamondback Energy, Inc. (a)		485		75,117
EOG Resources, Inc. (a)		1,588		201,295
EQT Corp. (a)		1,017		41,270
Exxon Mobil Corp. (a)		10,797		1,269,511
Hess Corp. (a)		773		118,269
Marathon Oil Corp. (a)		1,807		48,337
Marathon Petroleum Corp. (a)		1,068		161,631
Occidental Petroleum Corp. (a)		1,756		113,929
Phillips 66 (a)		1,187		142,618
Pioneer Natural Resources Co. (a)		618		141,862
Valero Energy Corp. (a)		942		133,491
				3,817,510
Oil & Gas Services — 0.4%
Baker Hughes Co. (a)		2,777		98,084
Halliburton Co. (a)		2,389		96,755
Schlumberger NV (a)		3,838		223,755
				418,594
Pipelines — 0.3%
Kinder Morgan, Inc. (a)		5,257		87,161
ONEOK, Inc. (a)		1,211		76,814
Targa Resources Corp. (a)		556		47,660
Williams Cos., Inc. (a)		3,352		112,929
				324,564
				4,668,295

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Financial — 13.5%
Banks — 3.7%
Bank of America Corp. (a)		18,739	$	513,074
Bank of New York Mellon Corp. (a)		1,938		82,656
Citigroup, Inc. (a)		5,193		213,588
Citizens Financial Group, Inc. (a)		1,189		31,865
Comerica, Inc. (a)		326		13,545
Fifth Third Bancorp (a)		1,799		45,569
Goldman Sachs Group, Inc. (a)		893		288,948
Huntington Bancshares, Inc. (a)		3,637		37,825
JP Morgan Chase & Co. (a)		7,852		1,138,697
KeyCorp. (a)		2,789		30,010
M&T Bank Corp. (a)		442		55,891
Morgan Stanley (a)		3,428		279,965
Northern Trust Corp. (a)		572		39,742
PNC Financial Services Group, Inc. (a)		1,061		130,259
Regions Financial Corp. (a)		2,764		47,541
State Street Corp. (a)		865		57,920
Truist Financial Corp. (a)		3,679		105,256
US Bancorp (a)		4,148		137,133
Wells Fargo & Co. (a)		9,857		402,757
Zions Bancorp NA (a)		473		16,503
				3,668,744
Diversified Financial Services — 3.5%
American Express Co. (a)		1,595		237,958
Ameriprise Financial, Inc. (a)		278		91,651
BlackRock, Inc. (a)		376		243,080
Capital One Financial Corp. (a)		982		95,303
Cboe Global Markets, Inc. (a)		273		42,645
Charles Schwab Corp. (a)		4,017		220,533
CME Group, Inc. (a)		1,000		200,220
Discover Financial Services (a)		652		56,483
Franklin Resources, Inc. (a)		675		16,591
Intercontinental Exchange, Inc. (a)		1,537		169,101
Invesco Ltd. (a)		1,194		17,337
Mastercard, Inc. Class A (a)		2,264		896,340
Nasdaq, Inc. (a)		918		44,606
Raymond James Financial, Inc. (a)		534		53,630
Synchrony Financial (a)		1,239		37,876
T. Rowe Price Group, Inc. (a)		619		64,915
Visa, Inc. Class A (a)		4,327		995,253
				3,483,522
Insurance — 3.8%
Aflac, Inc. (a)		1,465		112,439
Allstate Corp. (a)		685		76,316
American International Group, Inc. (a)		1,967		119,200
Aon PLC Class A (a)		555		179,942
Arch Capital Group Ltd. (a) (b)		990		78,913
Arthur J Gallagher & Co. (a)		601		136,986
Assurant, Inc. (a)		169		24,265
Berkshire Hathaway, Inc. Class B (a) (b)		4,919		1,723,126
Brown & Brown, Inc. (a)		588		41,066
Chubb Ltd. (a)		1,112		231,496
Cincinnati Financial Corp. (a)		420		42,962

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Everest Group Ltd. (a)		118	$	43,857
Globe Life, Inc. (a)		227		24,682
Hartford Financial Services Group, Inc. (a)		853		60,486
Loews Corp. (a)		382		24,184
Marsh & McLennan Cos., Inc. (a)		1,337		254,431
MetLife, Inc. (a)		1,752		110,218
Principal Financial Group, Inc. (a)		604		43,530
Progressive Corp. (a)		1,581		220,233
Prudential Financial, Inc. (a)		949		90,051
Travelers Cos., Inc. (a)		600		97,986
W. R. Berkley Corp. (a)		603		38,285
Willis Towers Watson PLC (a)		271		56,628
				3,831,282
Private Equity — 0.2%
Blackstone, Inc. (a)		1,906		204,209
Real Estate — 0.1%
CBRE Group, Inc. Class A (a) (b)		805		59,457
Real Estate Investment Trusts (REITS) — 2.2%
Alexandria Real Estate Equities, Inc. (a)		456		45,646
American Tower Corp. (a)		1,259		207,043
AvalonBay Communities, Inc. (a)		372		63,887
Boston Properties, Inc. (a)		328		19,509
Camden Property Trust (a)		260		24,591
Crown Castle, Inc. (a)		1,215		111,817
Digital Realty Trust, Inc. (a)		808		97,784
Equinix, Inc. (a)		252		183,018
Equity Residential (a)		879		51,606
Essex Property Trust, Inc. (a)		168		35,631
Extra Space Storage, Inc. (a)		550		66,869
Federal Realty Investment Trust (a)		154		13,957
Healthpeak Properties, Inc. (a)		1,659		30,459
Host Hotels & Resorts, Inc. (a)		1,947		31,288
Invitation Homes, Inc. (a)		1,638		51,908
Iron Mountain, Inc. (a)		833		49,522
Kimco Realty Corp. (a)		1,802		31,697
Mid-America Apartment Communities, Inc. (a)		289		37,180
Prologis, Inc. (a)		2,539		284,901
Public Storage (a)		415		109,361
Realty Income Corp. (a)		1,834		91,590
Regency Centers Corp. (a)		437		25,975
SBA Communications Corp. (a)		288		57,649
Simon Property Group, Inc. (a)		885		95,607
UDR, Inc. (a)		872		31,104
Ventas, Inc. (a)		1,157		48,744
VICI Properties, Inc. (a)		2,756		80,200
Welltower, Inc. (a)		1,396		114,360
Weyerhaeuser Co. (a)		2,021		61,964
				2,154,867
				13,402,081
Industrial — 7.4%
Aerospace & Defense — 1.4%
Boeing Co. (a) (b)		1,528		292,887

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
General Dynamics Corp. (a)		602	$	133,024
Howmet Aerospace, Inc. (a)		1,029		47,591
L3 Harris Technologies, Inc. (a)		510		88,801
Lockheed Martin Corp. (a)		617		252,329
Northrop Grumman Corp. (a)		395		173,875
RTX Corp. (a)		4,008		288,456
TransDigm Group, Inc. (a) (b)		137		115,509
				1,392,472
Building Materials — 0.5%
Carrier Global Corp. (a)		2,285		126,132
Johnson Controls International PLC (a)		1,870		99,503
Martin Marietta Materials, Inc. (a)		165		67,729
Masco Corp. (a)		543		29,023
Mohawk Industries, Inc. (a) (b)		120		10,297
Trane Technologies PLC (a)		626		127,022
Vulcan Materials Co. (a)		355		71,717
				531,423
Electrical Components & Equipment — 0.3%
AMETEK, Inc. (a)		645		95,305
Emerson Electric Co. (a)		1,518		146,593
Generac Holdings, Inc. (a) (b)		180		19,613
				261,511
Electronics — 1.0%
Agilent Technologies, Inc. (a)		778		86,996
Allegion PLC (a)		250		26,050
Amphenol Corp. Class A (a)		1,624		136,400
Fortive Corp. (a)		970		71,935
Garmin Ltd. (a)		452		47,550
Honeywell International, Inc. (a)		1,776		328,098
Keysight Technologies, Inc. (a) (b)		476		62,980
Mettler-Toledo International, Inc. (a) (b)		59		65,376
TE Connectivity Ltd. (a)		843		104,136
Trimble, Inc. (a) (b)		707		38,079
				967,600
Engineering & Construction — 0.0%
Jacobs Solutions, Inc. (a)		332		45,318
Environmental Controls — 0.3%
Pentair PLC (a)		468		30,303
Republic Services, Inc. (a)		589		83,939
Waste Management, Inc. (a)		978		149,086
				263,328
Hand & Machine Tools — 0.1%
Snap-on, Inc. (a)		140		35,709
Stanley Black & Decker, Inc. (a)		423		35,354
				71,063
Machinery – Construction & Mining — 0.4%
Caterpillar, Inc. (a)		1,389		379,197

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Machinery – Diversified — 0.8%
Deere & Co. (a)		741	$	279,639
Dover Corp. (a)		396		55,246
IDEX Corp. (a)		203		42,228
Ingersoll Rand, Inc. (a)		1,021		65,058
Nordson Corp. (a)		149		33,252
Otis Worldwide Corp. (a)		1,147		92,115
Rockwell Automation, Inc. (a)		311		88,906
Westinghouse Air Brake Technologies Corp. (a)		453		48,140
Xylem, Inc. (a)		662		60,262
				764,846
Miscellaneous - Manufacturing — 1.2%
3M Co. (a)		1,506		140,992
A.O. Smith Corp. (a)		389		25,725
Axon Enterprise, Inc. (a) (b)		199		39,599
Eaton Corp. PLC (a)		1,087		231,835
General Electric Co. (a)		2,933		324,243
Illinois Tool Works, Inc. (a)		733		168,817
Parker-Hannifin Corp. (a)		345		134,384
Teledyne Technologies, Inc. (a) (b)		122		49,847
Textron, Inc. (a)		576		45,009
				1,160,451
Packaging & Containers — 0.1%
Amcor PLC (a)		3,806		34,863
Ball Corp. (a)		863		42,960
Packaging Corp. of America (a)		260		39,923
Sealed Air Corp. (a)		401		13,177
Westrock Co. (a)		618		22,124
				153,047
Shipbuilding — 0.0%
Huntington Ingalls Industries, Inc. (a)		90		18,412
Transportation — 1.3%
C.H. Robinson Worldwide, Inc. (a)		274		23,600
CSX Corp. (a)		5,619		172,784
Expeditors International of Washington, Inc. (a)		439		50,323
FedEx Corp. (a)		632		167,429
JB Hunt Transport Services, Inc. (a)		212		39,966
Norfolk Southern Corp. (a)		603		118,749
Old Dominion Freight Line, Inc. (a)		247		101,058
Union Pacific Corp. (a)		1,645		334,971
United Parcel Service, Inc. Class B (a)		1,912		298,023
				1,306,903
				7,315,571
Technology — 26.0%
Computers — 8.3%
Accenture PLC Class A (a)		1,702		522,701
Apple, Inc. (a)		39,714		6,799,434
Cognizant Technology Solutions Corp. Class A (a)		1,386		93,888
DXC Technology Co. (a) (b)		704		14,664

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
EPAM Systems, Inc. (a) (b)		150	$	38,353
Fortinet, Inc. (a) (b)		1,741		102,162
Hewlett Packard Enterprise Co. (a)		3,426		59,510
HP, Inc. (a)		2,334		59,984
International Business Machines Corp. (a)		2,504		351,311
Leidos Holdings, Inc. (a)		415		38,246
NetApp, Inc. (a)		564		42,796
Seagate Technology Holdings PLC (a)		510		33,635
Western Digital Corp. (a) (b)		903		41,204
				8,197,888
Office & Business Equipment — 0.0%
Zebra Technologies Corp. Class A (a) (b)		140		33,114
Semiconductors — 7.1%
Advanced Micro Devices, Inc. (a) (b)		4,354		447,678
Analog Devices, Inc. (a)		1,351		236,547
Applied Materials, Inc. (a)		2,266		313,728
Broadcom, Inc. (a)		1,115		926,097
Intel Corp. (a)		11,278		400,933
KLA Corp. (a)		366		167,870
Lam Research Corp. (a)		368		230,651
Microchip Technology, Inc. (a)		1,506		117,543
Micron Technology, Inc. (a)		3,004		204,362
Monolithic Power Systems, Inc. (a)		125		57,750
NVIDIA Corp. (a)		6,676		2,903,993
NXP Semiconductors NV (a)		690		137,945
ON Semiconductor Corp. (a) (b)		1,193		110,889
Qorvo, Inc. (a) (b)		243		23,199
QUALCOMM, Inc. (a)		3,004		333,624
Skyworks Solutions, Inc. (a)		462		45,549
Teradyne, Inc. (a)		410		41,189
Texas Instruments, Inc. (a)		2,448		389,256
				7,088,803
Software — 10.6%
Activision Blizzard, Inc. (a)		1,948		182,391
Adobe, Inc. (a) (b)		1,229		626,667
Akamai Technologies, Inc. (a) (b)		423		45,066
ANSYS, Inc. (a) (b)		227		67,544
Autodesk, Inc. (a) (b)		576		119,180
Broadridge Financial Solutions, Inc. (a)		309		55,326
Cadence Design Systems, Inc. (a) (b)		742		173,851
Ceridian HCM Holding, Inc. (a) (b)		388		26,326
Electronic Arts, Inc. (a)		645		77,658
Fair Isaac Corp. (a) (b)		70		60,797
Fidelity National Information Services, Inc. (a)		1,630		90,090
Fiserv, Inc. (a) (b)		1,617		182,656
Intuit, Inc. (a)		757		386,782
Jack Henry & Associates, Inc. (a)		206		31,135
Microsoft Corp. (a)		20,074		6,338,366
MSCI, Inc. (a)		220		112,878
Oracle Corp. (a)		4,242		449,313
Paychex, Inc. (a)		873		100,683
Paycom Software, Inc. (a)		134		34,742
PTC, Inc. (a) (b)		318		45,054
Roper Technologies, Inc. (a)		285		138,020

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Salesforce, Inc. (a) (b)		2,648	$	536,961
ServiceNow, Inc. (a) (b)		559		312,459
Synopsys, Inc. (a) (b)		408		187,260
Take-Two Interactive Software, Inc. (a) (b)		420		58,964
Tyler Technologies, Inc. (a) (b)		107		41,317
				10,481,486
				25,801,291
Utilities — 2.3%
Electric — 2.1%
AES Corp. (a)		1,719		26,129
Alliant Energy Corp. (a)		726		35,175
Ameren Corp. (a)		766		57,320
American Electric Power Co., Inc. (a)		1,392		104,706
CenterPoint Energy, Inc. (a)		1,884		50,585
CMS Energy Corp. (a)		711		37,761
Consolidated Edison, Inc. (a)		986		84,333
Constellation Energy Corp. (a)		869		94,791
Dominion Energy, Inc. (a)		2,211		98,765
DTE Energy Co. (a)		526		52,221
Duke Energy Corp. (a)		2,084		183,934
Edison International (a)		986		62,404
Entergy Corp. (a)		614		56,795
Evergy, Inc. (a)		586		29,710
Eversource Energy (a)		969		56,347
Exelon Corp. (a)		2,640		99,766
FirstEnergy Corp. (a)		1,452		49,629
NextEra Energy, Inc. (a)		5,556		318,303
NRG Energy, Inc. (a)		649		24,999
PG&E Corp. (a) (b)		5,534		89,263
Pinnacle West Capital Corp. (a)		241		17,757
PPL Corp. (a)		1,758		41,418
Public Service Enterprise Group, Inc. (a)		1,404		79,902
Sempra (a)		1,676		114,018
Southern Co. (a)		2,909		188,271
WEC Energy Group, Inc. (a)		850		68,468
Xcel Energy, Inc. (a)		1,549		88,634
				2,211,404
Gas — 0.1%
Atmos Energy Corp. (a)		391		41,419
NiSource, Inc. (a)		1,069		26,383
				67,802
Water — 0.1%
American Water Works Co., Inc. (a)		503		62,286
				2,341,492
TOTAL COMMON STOCK (Cost $61,788,608)				97,098,492
TOTAL EQUITIES (Cost $61,788,608)				97,098,492

MML Managed Volatility Fund —  Portfolio of Investments (Continued)

	Principal Amount		Value
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(#) — 1.4% (Cost $1,096,132)				1,350,944
RIGHTS — 0.0%
Consumer, Non-cyclical — 0.0%
Health Care – Products — 0.0%
Abiomed, Inc., CVR (b) (c) (d)		136		—
TOTAL RIGHTS (Cost $139)				—
TOTAL LONG-TERM INVESTMENTS (Cost $62,884,879)				98,449,436
SHORT-TERM INVESTMENTS — 1.6%
Repurchase Agreement — 1.6%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (e)		1,612,661		1,612,661
TOTAL SHORT-TERM INVESTMENTS (Cost $1,612,661)				1,612,661
TOTAL INVESTMENTS — 100.8% (Cost $64,497,540) (f)				100,062,097
Other Assets/(Liabilities) — (0.8)%				(818,279)
NET ASSETS — 100.0%			$	99,243,818

Abbreviation Legend

CVR Contingent Value Rights

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

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

(b) Non-income producing security.

(c) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At September 30, 2023, these securities amounted to a value of $0 or 0.00% of net assets.

(d) Investment is valued using significant unobservable inputs.

(e) Maturity value of $1,612,876. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $1,644,981.

(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	11/17/23		3,925.00		33	USD	12,952,500	$	59,730	$	141,488	$	(81,758)
S&P 500 Index	11/17/23		4,050.00		33	USD	13,365,000		96,690		119,477		(22,787)
S&P 500 Index	12/15/23		4,100.00		33	USD	13,530,000		182,820		138,550		44,270
S&P 500 Index	12/15/23		4,150.00		30	USD	12,450,000		201,660		116,815		84,845
S&P 500 Index	1/19/24		4,150.00		32	USD	13,280,000		265,600		150,160		115,440
S&P 500 Index	2/16/24		4,050.00		32	USD	12,960,000		248,896		243,440		5,456
S&P 500 Index	3/15/24		4,050.00		33	USD	13,365,000		295,548		186,202		109,346
								$	1,350,944	$	1,096,132	$	254,812

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	10/20/23		4,400.00		25	USD	11,000,000	$	(48,900)	$	(261,688)	$	212,788
S&P 500 Index	10/20/23		4,550.00		25	USD	11,375,000		(2,375)		(108,330)		105,955
S&P 500 Index	10/20/23		4,650.00		25	USD	11,625,000		(375)		(239,938)		239,563
S&P 500 Index	10/20/23		4,700.00		25	USD	11,750,000		(375)		(158,715)		158,340
S&P 500 Index	10/31/23		4,350.00		25	USD	10,875,000		(133,750)		(163,563)		29,813
S&P 500 Index	10/31/23		4,400.00		26	USD	11,440,000		(83,980)		(183,495)		99,515
S&P 500 Index	11/17/23		4,400.00		25	USD	11,000,000		(128,750)		(197,563)		68,813
S&P 500 Index	11/17/23		4,500.00		25	USD	11,250,000		(54,075)		(219,688)		165,613
S&P 500 Index	11/30/23		4,400.00		25	USD	11,000,000		(163,600)		(187,560)		23,960
								$	(616,180)	$	(1,720,540)	$	1,104,360

Currency Legend

USD U.S. Dollar

MML Mid Cap Growth Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 97.8%
COMMON STOCK — 97.5%
Basic Materials — 0.5%
Chemicals — 0.5%
RPM International, Inc.		15,600	$	1,479,036
Communications — 5.1%
Advertising — 1.5%
Trade Desk, Inc. Class A (a)		60,300		4,712,445
Internet — 3.0%
CDW Corp.		19,884		4,011,796
Etsy, Inc. (a)		20,357		1,314,655
Maplebear, Inc. (a)		3,692		109,616
Maplebear, Inc., Lockup Shares (Acquired 11/19/21, Cost $624,541) (a) (b) (c)		5,164		153,319
Match Group, Inc. (a)		23,395		916,499
Spotify Technology SA (a)		18,500		2,860,840
				9,366,725
Media — 0.6%
Liberty Media Corp-Liberty Formula One Class C (a)		24,860		1,548,778
New York Times Co. Class A		14,200		585,040
				2,133,818
				16,212,988
Consumer, Cyclical — 12.0%
Airlines — 0.6%
Southwest Airlines Co.		68,800		1,862,416
Auto Parts & Equipment — 0.1%
Mobileye Global, Inc. Class A (a) (d)		4,416		183,485
Entertainment — 0.3%
Caesars Entertainment, Inc. (a)		12,905		598,147
DraftKings, Inc. Class A (a)		14,892		438,420
Liberty Media Corp-Liberty Live Class C (a)		1,232		39,547
				1,076,114
Lodging — 1.9%
Hilton Worldwide Holdings, Inc.		25,600		3,844,608
MGM Resorts International		58,432		2,147,960
				5,992,568

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

	Number of Shares		Value
Retail — 9.1%
Bath & Body Works, Inc.		48,200	$	1,629,160
Burlington Stores, Inc. (a)		20,500		2,773,650
Casey's General Stores, Inc.		8,400		2,280,768
Chipotle Mexican Grill, Inc. (a)		500		915,915
Dollar General Corp.		2,300		243,340
Dollar Tree, Inc. (a)		22,529		2,398,212
Domino's Pizza, Inc.		9,002		3,409,868
Five Below, Inc. (a)		10,400		1,673,360
Freshpet, Inc. (a)		42,533		2,802,074
Lululemon Athletica, Inc. (a)		8,284		3,194,393
O'Reilly Automotive, Inc. (a)		800		727,088
Ross Stores, Inc.		21,100		2,383,245
Tractor Supply Co.		3,385		687,324
Ulta Beauty, Inc. (a)		2,100		838,845
Yum! Brands, Inc.		20,007		2,499,675
				28,456,917
				37,571,500
Consumer, Non-cyclical — 31.3%
Beverages — 0.5%
Boston Beer Co., Inc. Class A (a)		2,094		815,676
Celsius Holdings, Inc. (a)		4,665		800,514
				1,616,190
Biotechnology — 4.2%
Alnylam Pharmaceuticals, Inc. (a)		13,900		2,461,690
Apellis Pharmaceuticals, Inc. (a) (d)		11,482		436,775
Argenx SE ADR (a)		2,523		1,240,383
Biogen, Inc. (a)		7,500		1,927,575
CRISPR Therapeutics AG (a) (d)		10,328		468,788
Illumina, Inc. (a)		13,509		1,854,516
Ionis Pharmaceuticals, Inc. (a)		40,400		1,832,544
Karuna Therapeutics, Inc. (a)		5,204		879,944
Roivant Sciences Ltd. (a)		43,894		512,682
Sarepta Therapeutics, Inc. (a)		7,520		911,574
Seagen, Inc. (a)		2,300		487,945
				13,014,416
Commercial Services — 8.7%
Bright Horizons Family Solutions, Inc. (a)		11,300		920,498
CoStar Group, Inc. (a)		56,915		4,376,194
Equifax, Inc.		15,900		2,912,562
FleetCor Technologies, Inc. (a)		10,800		2,757,672
Gartner, Inc. (a)		12,411		4,264,544
MarketAxess Holdings, Inc.		4,700		1,004,108
Paylocity Holding Corp. (a)		9,900		1,798,830
TransUnion		74,855		5,373,841
United Rentals, Inc.		4,400		1,956,108
Verisk Analytics, Inc.		8,600		2,031,664
				27,396,021

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

	Number of Shares		Value
Cosmetics & Personal Care — 0.4%
Kenvue, Inc.		67,162	$	1,348,613
Food — 0.3%
TreeHouse Foods, Inc. (a)		23,407		1,020,077
Health Care – Products — 11.2%
Alcon, Inc.		26,000		2,003,560
Align Technology, Inc. (a)		7,424		2,266,696
Avantor, Inc. (a)		149,500		3,151,460
Bruker Corp.		45,558		2,838,263
Cooper Cos., Inc.		6,900		2,194,269
DENTSPLY SIRONA, Inc.		21,200		724,192
Enovis Corp. (a)		27,578		1,454,188
Exact Sciences Corp. (a)		45,087		3,075,835
Hologic, Inc. (a)		88,800		6,162,720
ICU Medical, Inc. (a) (d)		6,300		749,763
Omnicell, Inc. (a)		18,128		816,485
Quidelortho Corp. (a)		17,733		1,295,218
Repligen Corp. (a)		10,412		1,655,612
Teleflex, Inc.		21,440		4,211,031
West Pharmaceutical Services, Inc.		6,335		2,376,955
				34,976,247
Health Care – Services — 4.5%
Acadia Healthcare Co., Inc. (a)		33,300		2,341,323
agilon health, Inc. (a) (d)		60,984		1,083,076
Catalent, Inc. (a)		49,248		2,242,261
ICON PLC (a)		14,802		3,644,993
Molina Healthcare, Inc. (a)		14,424		4,729,485
				14,041,138
Household Products & Wares — 1.2%
Avery Dennison Corp.		16,600		3,032,322
Reynolds Consumer Products, Inc.		33,900		868,857
				3,901,179
Pharmaceuticals — 0.3%
Ascendis Pharma AS ADR (a)		9,800		917,672
				98,231,553
Energy — 4.1%
Energy – Alternate Sources — 0.1%
Shoals Technologies Group, Inc. Class A (a)		21,600		394,200
Oil & Gas — 1.8%
Coterra Energy, Inc.		47,200		1,276,760
EQT Corp.		47,600		1,931,608
Pioneer Natural Resources Co.		10,015		2,298,943
Range Resources Corp.		8,300		269,003
				5,776,314
Oil & Gas Services — 0.2%
TechnipFMC PLC		31,208		634,771

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

	Number of Shares		Value
Pipelines — 2.0%
Cheniere Energy, Inc.		37,185	$	6,171,222
				12,976,507
Financial — 6.3%
Diversified Financial Services — 3.1%
Cboe Global Markets, Inc.		2,600		406,146
Hamilton Lane, Inc. Class A		32,520		2,941,109
Intercontinental Exchange, Inc.		22,500		2,475,450
Raymond James Financial, Inc.		14,600		1,466,278
Tradeweb Markets, Inc. Class A		32,300		2,590,460
				9,879,443
Insurance — 1.3%
Assurant, Inc.		18,200		2,613,156
Axis Capital Holdings Ltd.		17,100		963,927
Kemper Corp.		4,700		197,541
Markel Group, Inc. (a)		250		368,122
				4,142,746
Private Equity — 1.9%
Ares Management Corp. Class A		24,565		2,527,002
KKR & Co., Inc.		53,700		3,307,920
				5,834,922
				19,857,111
Industrial — 17.2%
Aerospace & Defense — 0.5%
Hexcel Corp.		23,812		1,551,114
Building Materials — 1.6%
Builders FirstSource, Inc. (a)		19,746		2,458,179
Martin Marietta Materials, Inc.		6,560		2,692,749
				5,150,928
Electrical Components & Equipment — 0.1%			��
Littelfuse, Inc.		1,800		445,176
Electronics — 4.7%
Agilent Technologies, Inc.		55,403		6,195,164
Amphenol Corp. Class A		22,600		1,898,174
Fortive Corp.		49,400		3,663,504
Keysight Technologies, Inc. (a)		21,400		2,831,434
				14,588,276
Environmental Controls — 1.0%
Clean Harbors, Inc. (a)		14,417		2,412,829
Waste Connections, Inc.		6,000		805,800
				3,218,629

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

	Number of Shares		Value
Machinery – Construction & Mining — 1.6%
BWX Technologies, Inc.		64,639	$	4,846,632
Machinery – Diversified — 2.7%
Cognex Corp.		21,100		895,484
Esab Corp.		25,983		1,824,526
IDEX Corp.		6,600		1,372,932
Ingersoll Rand, Inc.		70,900		4,517,748
				8,610,690
Miscellaneous - Manufacturing — 2.1%
Axon Enterprise, Inc. (a)		8,317		1,655,000
Textron, Inc.		62,093		4,851,947
				6,506,947
Packaging & Containers — 1.6%
Ball Corp.		73,047		3,636,280
Sealed Air Corp.		40,000		1,314,400
				4,950,680
Transportation — 1.3%
JB Hunt Transport Services, Inc.		21,700		4,090,884
				53,959,956
Technology — 21.0%
Computers — 1.7%
Crowdstrike Holdings, Inc. Class A (a)		20,910		3,499,916
Fortinet, Inc. (a)		28,000		1,643,040
				5,142,956
Semiconductors — 6.6%
KLA Corp.		8,688		3,984,838
Lattice Semiconductor Corp. (a)		17,500		1,503,775
Marvell Technology, Inc.		107,307		5,808,528
Microchip Technology, Inc.		93,000		7,258,650
NXP Semiconductors NV		4,200		839,664
ON Semiconductor Corp. (a)		15,409		1,432,266
				20,827,721
Software — 12.7%
Aspen Technology, Inc. (a)		11,905		2,431,715
Atlassian Corp. Class A (a)		5,200		1,047,852
Bill Holdings, Inc. (a) (d)		10,728		1,164,739
Broadridge Financial Solutions, Inc.		11,472		2,054,062
Cadence Design Systems, Inc. (a)		8,334		1,952,656
CCC Intelligent Solutions Holdings, Inc. (a)		131,491		1,755,405
Ceridian HCM Holding, Inc. (a)		39,505		2,680,414
Clear Secure, Inc. Class A		14,693		279,755
Confluent, Inc. Class A (a)		8,900		263,529
Electronic Arts, Inc.		24,154		2,908,142
Fair Isaac Corp. (a)		2,800		2,431,884
HashiCorp, Inc. Class A (a)		4,500		102,735
Klaviyo, Inc. Class A (a) (d)		4,247		146,521

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

	Number of Shares		Value
MongoDB, Inc. (a)		6,800	$	2,351,848
MSCI, Inc.		6,183		3,172,374
PTC, Inc. (a)		21,575		3,056,746
Roper Technologies, Inc.		4,600		2,227,688
Synopsys, Inc. (a)		2,282		1,047,369
Tyler Technologies, Inc. (a)		1,700		656,438
Veeva Systems, Inc. Class A (a)		31,188		6,345,199
ZoomInfo Technologies, Inc. (a)		107,722		1,766,640
				39,843,711
				65,814,388
TOTAL COMMON STOCK (Cost $262,288,743)				306,103,039
PREFERRED STOCK — 0.3%
Consumer, Cyclical — 0.0%
Auto Manufacturers — 0.0%
Nuro, Inc., Series D (Acquired 10/29/21, Cost $159,220) (a) (b) (c) (e)		7,638		47,356
Consumer, Non-cyclical — 0.1%
Commercial Services — 0.1%
Redwood Materials, Inc., Series C (Acquired 5/28/21, Cost $200,090) (a) (b) (c) (e)		4,221		201,493
Health Care – Services — 0.0%
Caris Life Sciences, Inc., Series D (Acquired 5/11/21, Cost $271,366) (a) (b) (c) (e)		33,502		179,236
				380,729
Industrial — 0.1%
Electrical Components & Equipment — 0.1%
Sila Nanotechnologies, Inc., Series F (Acquired 1/07/21, Cost $407,982) (a) (b) (c) (e)		9,885		200,468
Technology — 0.1%
Software — 0.1%
Databricks, Inc., Series H (Acquired 8/31/21, Cost $185,327) (a) (b) (c) (e)		2,522		185,367
TOTAL PREFERRED STOCK (Cost $1,223,984)				813,920
TOTAL EQUITIES (Cost $263,512,727)				306,916,959
TOTAL LONG-TERM INVESTMENTS (Cost $263,512,727)				306,916,959
SHORT-TERM INVESTMENTS — 2.6%
Investment of Cash Collateral from Securities Loaned — 0.2%
State Street Navigator Securities Lending Government Money Market Portfolio (f)		629,982		629,982
Mutual Fund — 0.0%
T. Rowe Price Treasury Reserve Fund		107		107

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

	Principal Amount		Value
Repurchase Agreement — 2.4%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (g)	$	7,594,441	$	7,594,441
TOTAL SHORT-TERM INVESTMENTS (Cost $8,224,530)				8,224,530
TOTAL INVESTMENTS — 100.4% (Cost $271,737,257) (h)				315,141,489
Other Assets/(Liabilities) — (0.4)%				(1,266,617)
NET ASSETS — 100.0%			$	313,874,872

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) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At September 30, 2023, these securities amounted to a value of $967,239 or 0.31% of net assets.

(c) Restricted security. Certain securities are restricted to resale. At September 30, 2023, these securities amounted to a value of $967,239 or 0.31% of net assets. The Fund generally bears the costs, if any, associated with the disposition of restricted securities.

(d) Denotes all or a portion of security on loan. The total value of securities on loan as of September 30, 2023, was $4,026,992 or 1.28% of net assets. The Fund received $3,487,359 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).

(e) Investment is valued using significant unobservable inputs.

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

(g) Maturity value of $7,595,454. Collateralized by U.S. Government Agency obligations with rates ranging from 0.375% - 0.500%, maturity dates ranging from 1/31/26 - 2/28/26, and an aggregate market value, including accrued interest, of $7,746,402.

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

MML Mid Cap Value Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares			Value
EQUITIES — 96.4%
COMMON STOCK — 95.7%			��
Basic Materials — 1.3%
Chemicals — 1.3%
Akzo Nobel NV		44,174		$	3,187,796
Communications — 5.8%
Advertising — 1.5%
Interpublic Group of Cos., Inc.		83,007			2,378,980
Omnicom Group, Inc.		18,439			1,373,337
					3,752,317
Internet — 1.2%
F5, Inc. (a)		19,302			3,110,324
Media — 1.2%
Fox Corp. Class B		100,566			2,904,346
Telecommunications — 1.9%
BCE, Inc. (b)		45,875			1,751,238
Corning, Inc.		33,740			1,028,058
Juniper Networks, Inc.		72,761			2,022,028
					4,801,324
					14,568,311
Consumer, Cyclical — 9.3%
Airlines — 1.4%
Southwest Airlines Co.		129,540			3,506,648
Auto Manufacturers — 0.6%
Cummins, Inc.		6,875			1,570,662
Auto Parts & Equipment — 2.5%
Aptiv PLC (a)		13,189			1,300,303
BorgWarner, Inc.		71,191			2,873,981
Cie Generale des Etablissements Michelin SCA		68,764			2,107,603
					6,281,887
Distribution & Wholesale — 1.0%
Bunzl PLC		72,009			2,555,789
Retail — 3.8%
Beacon Roofing Supply, Inc. (a)		29,799			2,299,589
Dollar Tree, Inc. (a)		34,295			3,650,703

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

	Number of Shares		Value
MSC Industrial Direct Co., Inc. Class A		36,863	$	3,618,103
				9,568,395
				23,483,381
Consumer, Non-cyclical — 21.6%
Cosmetics & Personal Care — 0.6%
Kenvue, Inc.		71,468		1,435,077
Food — 5.2%
Conagra Brands, Inc.		212,514		5,827,134
General Mills, Inc.		19,797		1,266,810
J. M. Smucker Co.		10,394		1,277,527
Koninklijke Ahold Delhaize NV		156,842		4,729,273
				13,100,744
Health Care – Products — 5.1%
DENTSPLY SIRONA, Inc.		43,270		1,478,103
Embecta Corp.		44,134		664,217
Envista Holdings Corp. (a)		66,991		1,867,709
Hologic, Inc. (a)		18,837		1,307,288
Smith & Nephew PLC ADR Sponsored ADR		47,347		1,172,785
Zimmer Biomet Holdings, Inc.		57,662		6,470,830
				12,960,932
Health Care – Services — 5.2%
Centene Corp. (a)		29,306		2,018,597
Laboratory Corp. of America Holdings		15,601		3,136,581
Quest Diagnostics, Inc.		35,796		4,362,101
Universal Health Services, Inc. Class B		28,806		3,621,778
				13,139,057
Household Products & Wares — 1.6%
Kimberly-Clark Corp.		33,329		4,027,810
Pharmaceuticals — 3.9%
Cardinal Health, Inc.		26,866		2,332,506
Cencora, Inc.		11,673		2,100,790
Henry Schein, Inc. (a)		71,778		5,329,516
				9,762,812
				54,426,432
Energy — 5.0%
Oil & Gas — 2.3%
Devon Energy Corp.		11,826		564,100
Diamondback Energy, Inc.		11,652		1,804,662
EQT Corp.		33,458		1,357,726
Occidental Petroleum Corp.		33,762		2,190,478
				5,916,966
Oil & Gas Services — 0.8%
Baker Hughes Co.		56,500		1,995,580

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

	Number of Shares		Value
Pipelines — 1.9%
Enterprise Products Partners LP (c)		171,272	$	4,687,715
				12,600,261
Financial — 24.4%
Banks — 7.9%
Bank of New York Mellon Corp.		133,821		5,707,466
First Hawaiian, Inc.		111,406		2,010,878
Northern Trust Corp.		86,390		6,002,377
Prosperity Bancshares, Inc.		16,899		922,348
Truist Financial Corp.		102,679		2,937,646
US Bancorp		37,480		1,239,089
Westamerica BanCorp		22,401		968,843
				19,788,647
Diversified Financial Services — 1.4%
T. Rowe Price Group, Inc.		33,854		3,550,269
Insurance — 7.6%
Aflac, Inc.		32,604		2,502,357
Allstate Corp.		55,608		6,195,287
Hanover Insurance Group, Inc.		19,398		2,152,790
Reinsurance Group of America, Inc.		28,622		4,155,628
Willis Towers Watson PLC		20,452		4,273,650
				19,279,712
Real Estate Investment Trusts (REITS) — 7.3%
Essex Property Trust, Inc.		13,838		2,934,902
Healthpeak Properties, Inc.		165,607		3,040,545
Public Storage		10,156		2,676,309
Realty Income Corp.		71,772		3,584,294
Regency Centers Corp.		55,239		3,283,406
VICI Properties, Inc.		51,254		1,491,491
WP Carey, Inc.		23,417		1,266,391
				18,277,338
Savings & Loans — 0.2%
Capitol Federal Financial, Inc.		125,592		599,074
				61,495,040
Industrial — 15.2%
Aerospace & Defense — 0.7%
General Dynamics Corp.		7,901		1,745,884
Building Materials — 1.0%
Cie de Saint-Gobain SA		41,486		2,485,365
Electrical Components & Equipment — 1.6%
Emerson Electric Co.		42,070		4,062,700
Electronics — 1.4%
nVent Electric PLC		17,591		932,147

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

	Number of Shares		Value
TE Connectivity Ltd.		20,637	$	2,549,289
				3,481,436
Engineering & Construction — 1.3%
Vinci SA		29,304		3,244,150
Environmental Controls — 0.5%
Republic Services, Inc.		8,843		1,260,216
Machinery – Construction & Mining — 1.3%
Oshkosh Corp.		35,943		3,430,041
Machinery – Diversified — 0.4%
IMI PLC		51,234		974,433
Packaging & Containers — 3.6%
Amcor PLC		345,963		3,169,021
Packaging Corp. of America		28,772		4,417,940
Sonoco Products Co.		30,185		1,640,555
				9,227,516
Shipbuilding — 1.4%
Huntington Ingalls Industries, Inc.		16,838		3,444,718
Transportation — 2.0%
Heartland Express, Inc.		122,869		1,804,946
Norfolk Southern Corp.		16,763		3,301,137
				5,106,083
				38,462,542
Technology — 3.0%
Computers — 2.2%
Amdocs Ltd.		38,779		3,276,438
HP, Inc.		89,237		2,293,391
				5,569,829
Semiconductors — 0.3%
Teradyne, Inc.		7,306		733,961
Software — 0.5%
Electronic Arts, Inc.		10,723		1,291,049
				7,594,839
Utilities — 10.1%
Electric — 8.1%
CMS Energy Corp.		34,724		1,844,192
Duke Energy Corp.		36,041		3,180,979
Edison International		50,055		3,167,981
Evergy, Inc.		49,065		2,487,595
Eversource Energy		32,167		1,870,511
Northwestern Energy Group, Inc.		80,391		3,863,591
Pinnacle West Capital Corp.		28,441		2,095,533

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

	Number of Shares		Value
WEC Energy Group, Inc.		25,096	$	2,021,483
				20,531,865
Gas — 2.0%
Atmos Energy Corp.		7,296		772,865
Spire, Inc.		75,811		4,289,387
				5,062,252
				25,594,117
TOTAL COMMON STOCK (Cost $266,009,102)				241,412,719
PREFERRED STOCK — 0.7%
Consumer, Non-cyclical — 0.7%
Household Products & Wares — 0.7%
Henkel AG & Co. KGaA 2.753%		25,475		1,818,211
TOTAL PREFERRED STOCK (Cost $1,687,653)				1,818,211
TOTAL EQUITIES (Cost $267,696,755)				243,230,930
MUTUAL FUNDS — 2.0%
Diversified Financial Services — 2.0%
iShares Russell Mid-Cap Value ETF (b)		48,305		5,040,144
TOTAL MUTUAL FUNDS (Cost $5,365,954)				5,040,144
TOTAL LONG-TERM INVESTMENTS (Cost $273,062,709)				248,271,074
SHORT-TERM INVESTMENTS — 2.2%
Investment of Cash Collateral from Securities Loaned — 0.2%
State Street Navigator Securities Lending Government Money Market Portfolio (d)		341,972		341,972
	Principal Amount
Repurchase Agreement — 2.0%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (e)	$	5,104,418		5,104,418
TOTAL SHORT-TERM INVESTMENTS (Cost $5,446,390)				5,446,390

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

	Principal Amount	Value
TOTAL INVESTMENTS — 100.6% (Cost $278,509,099) (f)		$	253,717,464
Other Assets/(Liabilities) — (0.6)%			(1,546,747)
NET ASSETS — 100.0%		$	252,170,717

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 September 30, 2023, was $6,715,625 or 2.66% of net assets. The Fund received $6,650,060 of non-cash collateral (U.S. Treasury and/or Agency obligations) related to securities lending activity. This amount is not reflected on the Portfolio of Investments. (Note 2).

(c) Security is a Master Limited Partnership.

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

(e) Maturity value of $5,105,099. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $5,206,543.

(f) 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.	12/22/23	USD	5,066,600	EUR	4,766,577	$	8,001
Goldman Sachs & Co.	12/22/23	CAD	64,730	USD	48,003		(285)
Goldman Sachs & Co.	12/22/23	USD	3,937,577	GBP	3,222,767		3,240
Goldman Sachs & Co.	12/22/23	USD	1,554,140	CAD	2,095,524		9,347
JP Morgan Chase Bank N.A.	12/22/23	USD	5,067,515	EUR	4,766,577		8,916
Morgan Stanley & Co. LLC	12/22/23	USD	5,068,530	EUR	4,766,577		9,931
						$	39,150

Currency Legend

CAD Canadian Dollar

EUR Euro

GBP British Pound

USD U.S. Dollar

MML Small Cap Growth Equity Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.4%
COMMON STOCK — 99.4%
Basic Materials — 3.2%
Chemicals — 3.2%
Cabot Corp.		31,831	$	2,204,933
Livent Corp. (a) (b)		69,712		1,283,398
Methanex Corp.		17,988		810,360
				4,298,691
Communications — 5.7%
Internet — 3.3%
Cargurus, Inc. (a)		42,238		740,010
Criteo SA Sponsored ADR (a)		22,290		650,868
ePlus, Inc. (a)		6,347		403,162
Eventbrite, Inc. Class A (a)		88,769		875,262
Perficient, Inc. (a)		10,685		618,234
Squarespace, Inc. Class A (a)		19,262		558,020
Ziff Davis, Inc. (a)		10,812		688,616
				4,534,172
Media — 0.7%
New York Times Co. Class A		21,701		894,081
Telecommunications — 1.7%
Calix, Inc. (a)		36,828		1,688,196
Viavi Solutions, Inc. (a)		75,224		687,547
				2,375,743
				7,803,996
Consumer, Cyclical — 11.4%
Apparel — 1.6%
Carter's, Inc.		8,119		561,429
Crocs, Inc. (a)		9,850		869,065
Steven Madden Ltd. (b)		22,744		722,577
				2,153,071
Auto Parts & Equipment — 0.5%
Visteon Corp. (a)		5,200		717,964
Distribution & Wholesale — 1.3%
Rush Enterprises, Inc. Class A		41,407		1,690,648
Entertainment — 0.5%
Cinemark Holdings, Inc. (a)		39,169		718,751

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

	Number of Shares		Value
Food Services — 0.4%
Sovos Brands, Inc. (a)		25,163	$	567,426
Home Builders — 1.7%
Century Communities, Inc.		9,760		651,773
Skyline Champion Corp. (a)		26,590		1,694,315
				2,346,088
Leisure Time — 1.6%
Acushnet Holdings Corp.		10,362		549,601
YETI Holdings, Inc. (a)		33,415		1,611,271
				2,160,872
Lodging — 0.7%
Boyd Gaming Corp.		14,932		908,313
Retail — 3.1%
Boot Barn Holdings, Inc. (a)		6,689		543,080
Denny's Corp. (a)		14,248		120,681
Freshpet, Inc. (a)		7,782		512,678
Papa John's International, Inc. (b)		9,288		633,627
Patrick Industries, Inc.		6,195		464,997
Victoria's Secret & Co. (a)		20,586		343,374
Wingstop, Inc.		8,775		1,578,096
				4,196,533
				15,459,666
Consumer, Non-cyclical — 23.0%
Beverages — 0.9%
Celsius Holdings, Inc. (a)		7,175		1,231,230
Biotechnology — 7.2%
Akero Therapeutics, Inc. (a)		11,493		581,316
Amicus Therapeutics, Inc. (a)		48,533		590,161
Apellis Pharmaceuticals, Inc. (a) (b)		13,312		506,389
Blueprint Medicines Corp. (a)		6,268		314,779
Celldex Therapeutics, Inc. (a)		4,337		119,354
Crinetics Pharmaceuticals, Inc. (a)		28,466		846,579
Cytokinetics, Inc. (a)		21,085		621,164
Immatics NV (a)		56,357		652,614
Immunocore Holdings PLC ADR (a)		6,297		326,814
ImmunoGen, Inc. (a)		10,742		170,476
Intellia Therapeutics, Inc. (a)		9,402		297,291
Intra-Cellular Therapies, Inc. (a)		12,791		666,283
Kymera Therapeutics, Inc. (a)		16,949		235,591
Myriad Genetics, Inc. (a)		30,971		496,775
Prothena Corp. PLC (a)		4,568		220,406
PTC Therapeutics, Inc. (a)		8,805		197,320
Revolution Medicines, Inc. (a)		21,496		595,009
Rocket Pharmaceuticals, Inc. (a)		39,003		799,171
Structure Therapeutics, Inc. ADR (a) (b)		3,688		185,949
Syndax Pharmaceuticals, Inc. (a)		27,369		397,398
Veracyte, Inc. (a)		22,432		500,907
Xenon Pharmaceuticals, Inc. (a)		7,961		271,948

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

	Number of Shares		Value
Zentalis Pharmaceuticals, Inc. (a)		8,037	$	161,222
				9,754,916
Commercial Services — 3.5%
Cross Country Healthcare, Inc. (a)		26,327		652,646
European Wax Center, Inc. Class A (a)		26,342		426,740
H&R Block, Inc.		19,010		818,571
Herc Holdings, Inc.		4,859		577,930
ManpowerGroup, Inc.		9,606		704,312
TriNet Group, Inc. (a)		14,019		1,632,933
				4,813,132
Cosmetics & Personal Care — 1.0%
elf Beauty, Inc. (a)		12,102		1,329,163
Food — 0.5%
TreeHouse Foods, Inc. (a)		15,279		665,859
Health Care – Products — 5.6%
Glaukos Corp. (a)		19,400		1,459,850
Globus Medical, Inc. Class A (a)		10,725		532,496
Haemonetics Corp. (a)		21,252		1,903,754
Inari Medical, Inc. (a)		12,467		815,342
Inspire Medical Systems, Inc. (a)		4,338		860,833
Lantheus Holdings, Inc. (a)		2,369		164,598
Omnicell, Inc. (a)		10,059		453,057
PROCEPT BioRobotics Corp. (a)		22,019		722,444
Shockwave Medical, Inc. (a)		3,346		666,189
				7,578,563
Health Care – Services — 2.4%
Acadia Healthcare Co., Inc. (a)		19,006		1,336,312
Amedisys, Inc. (a)		6,319		590,194
HealthEquity, Inc. (a)		9,913		724,145
Surgery Partners, Inc. (a) (b)		21,068		616,239
				3,266,890
Pharmaceuticals — 1.9%
Aclaris Therapeutics, Inc. (a)		43,885		300,612
Ascendis Pharma AS ADR (a)		1,705		159,656
BellRing Brands, Inc. (a)		17,690		729,359
Merus NV (a)		17,830		420,431
Morphic Holding, Inc. (a)		10,511		240,807
Revance Therapeutics, Inc. (a)		8,811		101,062
Vaxcyte, Inc. (a)		7,869		401,162
Verona Pharma PLC ADR (a) (b)		19,033		310,238
				2,663,327
				31,303,080
Energy — 7.1%
Energy – Alternate Sources — 1.3%
Maxeon Solar Technologies Ltd. (a) (b)		20,237		234,547

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

	Number of Shares		Value
Shoals Technologies Group, Inc. Class A (a)		84,685	$	1,545,501
				1,780,048
Oil & Gas — 5.6%
Chord Energy Corp.		12,490		2,024,254
Gulfport Energy Corp. (a)		5,888		698,670
Magnolia Oil & Gas Corp. Class A		35,849		821,301
Seadrill Ltd. (a)		31,304		1,402,106
Sitio Royalties Corp. Class A		30,317		733,974
Viper Energy Partners LP		69,436		1,935,876
				7,616,181
Oil & Gas Services — 0.2%
Aris Water Solutions, Inc. Class A		24,323		242,744
				9,638,973
Financial — 15.8%
Banks — 3.9%
Ameris Bancorp		23,343		896,138
Cadence Bank		63,034		1,337,582
First Interstate BancSystem, Inc. Class A		28,310		706,051
Hancock Whitney Corp.		21,864		808,749
National Bank Holdings Corp. Class A		25,474		758,106
Seacoast Banking Corp. of Florida		38,591		847,458
				5,354,084
Diversified Financial Services — 3.8%
Air Lease Corp.		24,443		963,299
Hannon Armstrong Sustainable Infrastructure Capital, Inc. (b)		56,586		1,199,623
PJT Partners, Inc. Class A		18,432		1,464,238
PRA Group, Inc. (a)		36,872		708,311
StepStone Group, Inc. Class A		27,562		870,408
				5,205,879
Insurance — 2.6%
Assured Guaranty Ltd.		15,916		963,236
Kemper Corp.		14,803		622,170
MGIC Investment Corp.		32,846		548,200
Selective Insurance Group, Inc.		6,928		714,762
SiriusPoint Ltd. (a)		67,840		689,933
				3,538,301
Real Estate — 0.6%
McGrath RentCorp		7,503		752,101
Real Estate Investment Trusts (REITS) — 4.9%
Douglas Emmett, Inc. (b)		45,260		577,518
Essential Properties Realty Trust, Inc.		33,263		719,479
National Storage Affiliates Trust		17,179		545,261
Phillips Edison & Co., Inc.		48,613		1,630,480
PotlatchDeltic Corp.		17,273		784,021
Ryman Hospitality Properties, Inc.		11,872		988,700
Terreno Realty Corp.		12,322		699,890

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

	Number of Shares		Value
Xenia Hotels & Resorts, Inc.		57,800	$	680,884
				6,626,233
				21,476,598
Industrial — 17.3%
Aerospace & Defense — 1.3%
Curtiss-Wright Corp.		5,610		1,097,484
Leonardo DRS, Inc. (a)		40,961		684,049
				1,781,533
Building Materials — 1.9%
AZEK Co., Inc. (a)		61,283		1,822,557
Boise Cascade Co.		7,708		794,232
				2,616,789
Electrical Components & Equipment — 1.0%
Acuity Brands, Inc.		2,996		510,248
Novanta, Inc. (a)		6,052		868,099
				1,378,347
Engineering & Construction — 2.8%
Comfort Systems USA, Inc.		6,983		1,189,973
Fluor Corp. (a)		72,467		2,659,539
				3,849,512
Environmental Controls — 1.1%
Casella Waste Systems, Inc. Class A (a)		9,565		729,809
Clean Harbors, Inc. (a)		4,374		732,033
				1,461,842
Hand & Machine Tools — 0.4%
Kennametal, Inc.		21,801		542,409
Machinery – Diversified — 5.0%
Albany International Corp. Class A		6,278		541,666
Applied Industrial Technologies, Inc.		10,896		1,684,631
Cactus, Inc. Class A		21,887		1,098,946
Flowserve Corp.		24,172		961,320
Middleby Corp. (a)		4,680		599,040
Zurn Elkay Water Solutions Corp. Class C		68,652		1,923,629
				6,809,232
Metal Fabricate & Hardware — 0.5%
Helios Technologies, Inc.		12,250		679,630
Miscellaneous - Manufacturing — 0.5%
EnPro Industries, Inc.		5,800		702,902
Packaging & Containers — 0.6%
Graphic Packaging Holding Co.		34,307		764,360
Transportation — 1.7%
Kirby Corp. (a)		11,318		937,130

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

	Number of Shares		Value
RXO, Inc. (a)		33,657	$	664,053
Ryder System, Inc.		6,319		675,817
				2,277,000
Trucking & Leasing — 0.5%
GATX Corp.		6,060		659,510
				23,523,066
Technology — 14.0%
Computers — 2.0%
CyberArk Software Ltd. (a)		4,867		797,068
Exlservice Holdings, Inc. (a)		42,742		1,198,486
Rapid7, Inc. (a)		15,717		719,524
				2,715,078
Semiconductors — 2.5%
Cirrus Logic, Inc. (a)		4,866		359,889
FormFactor, Inc. (a)		21,387		747,262
MKS Instruments, Inc.		5,587		483,499
Power Integrations, Inc.		9,029		689,003
SiTime Corp. (a)		4,362		498,359
Synaptics, Inc. (a)		7,067		632,072
				3,410,084
Software — 9.5%
Clearwater Analytics Holdings, Inc. Class A (a)		23,726		458,861
DoubleVerify Holdings, Inc. (a)		55,279		1,545,048
Duolingo, Inc. (a)		3,047		505,406
Five9, Inc. (a)		12,231		786,453
Global-e Online Ltd. (a)		17,555		697,636
Intapp, Inc. (a)		11,023		369,491
Jamf Holding Corp. (a)		80,778		1,426,539
Manhattan Associates, Inc. (a)		5,339		1,055,307
New Relic, Inc. (a)		15,038		1,287,554
PowerSchool Holdings, Inc. Class A (a) (b)		51,855		1,175,034
RingCentral, Inc. Class A (a)		5,968		176,832
Sprout Social, Inc. Class A (a) (b)		30,823		1,537,451
Verra Mobility Corp. (a)		96,071		1,796,528
				12,818,140
				18,943,302
Utilities — 1.9%
Electric — 1.4%
Ameresco, Inc. Class A (a) (b)		16,866		650,353
Atlantica Sustainable Infrastructure PLC		31,019		592,463
IDACORP, Inc.		5,200		486,980
Portland General Electric Co.		5,585		226,081
				1,955,877
Gas — 0.5%
ONE Gas, Inc.		8,841		603,663
				2,559,540

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

	Number of Shares		Value
TOTAL COMMON STOCK (Cost $130,710,612)			$	135,006,912
TOTAL EQUITIES (Cost $130,710,612)				135,006,912
MUTUAL FUNDS — 0.5%
Diversified Financial Services — 0.5%
iShares Russell 2000 ETF (b)		3,388		598,795
iShares Russell 2000 Growth ETF		601		134,715
				733,510
TOTAL MUTUAL FUNDS (Cost $798,705)				733,510
TOTAL LONG-TERM INVESTMENTS (Cost $131,509,317)				135,740,422
SHORT-TERM INVESTMENTS — 1.3%
Investment of Cash Collateral from Securities Loaned — 1.2%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		1,627,524		1,627,524
	Principal Amount
Repurchase Agreement — 0.1%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (d)	$	147,316		147,316
TOTAL SHORT-TERM INVESTMENTS (Cost $1,774,840)				1,774,840
TOTAL INVESTMENTS — 101.2% (Cost $133,284,157) (e)				137,515,262
Other Assets/(Liabilities) — (1.2)%				(1,678,490)
NET ASSETS — 100.0%			$	135,836,772

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 September 30, 2023, was $9,805,793 or 7.22% of net assets. The Fund received $8,420,248 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 $147,336. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $150,288.

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

MML Small Company Value Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.8%
COMMON STOCK — 99.8%
Basic Materials — 1.8%
Chemicals — 1.8%
Element Solutions, Inc.		14,169	$	277,854
Ingevity Corp. (a)		5,160		245,668
Minerals Technologies, Inc.		13,628		746,269
				1,269,791
				1,269,791
Communications — 2.3%
Internet — 0.9%
Entravision Communications Corp. Class A		111,934		408,559
Solo Brands, Inc. Class A (a)		44,543		227,169
				635,728
Media — 1.4%
Cable One, Inc.		1,443		888,369
Townsquare Media, Inc. Class A		9,154		79,823
				968,192
				1,603,920
Consumer, Cyclical — 18.1%
Apparel — 1.9%
Tapestry, Inc.		44,891		1,290,616
Distribution & Wholesale — 1.4%
A-Mark Precious Metals, Inc.		18,329		537,589
OPENLANE, Inc. (a)		17,566		262,085
Titan Machinery, Inc. (a)		7,546		200,573
				1,000,247
Entertainment — 1.3%
Accel Entertainment, Inc. (a)		40,397		442,347
Everi Holdings, Inc. (a)		32,232		426,107
				868,454
Home Builders — 2.7%
Cavco Industries, Inc. (a)		1,106		293,820
Skyline Champion Corp. (a)		25,200		1,605,744
				1,899,564

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

	Number of Shares		Value
Home Furnishing — 0.3%
Vizio Holding Corp. Class A (a)		34,696	$	187,705
Leisure Time — 3.3%
Brunswick Corp.		17,941		1,417,339
Malibu Boats, Inc. Class A (a)		12,427		609,172
Planet Fitness, Inc. Class A (a)		5,824		286,424
				2,312,935
Lodging — 0.6%
Boyd Gaming Corp.		6,218		378,241
Retail — 6.6%
Beacon Roofing Supply, Inc. (a)		13,456		1,038,400
Dave & Buster's Entertainment, Inc. (a)		21,559		799,192
GMS, Inc. (a)		14,435		923,407
MarineMax, Inc. (a)		22,527		739,336
OneWater Marine, Inc. Class A (a) (b)		19,415		497,412
Penske Automotive Group, Inc.		2,964		495,166
Red Robin Gourmet Burgers, Inc. (a) (b)		9,038		72,666
				4,565,579
				12,503,341
Consumer, Non-cyclical — 14.6%
Agriculture — 0.3%
Turning Point Brands, Inc.		10,083		232,816
Commercial Services — 9.1%
AMN Healthcare Services, Inc. (a)		1,742		148,384
Barrett Business Services, Inc.		3,719		335,603
Brink's Co.		18,182		1,320,741
Deluxe Corp.		30,370		573,689
Euronet Worldwide, Inc. (a)		10,411		826,425
EVERTEC, Inc.		43,552		1,619,263
Korn Ferry		20,390		967,302
Loomis AB		15,047		404,050
Repay Holdings Corp. (a)		12,624		95,816
				6,291,273
Cosmetics & Personal Care — 1.7%
Edgewell Personal Care Co.		32,384		1,196,913
Health Care – Products — 1.8%
Embecta Corp.		25,792		388,170
Enovis Corp. (a)		7,924		417,832
Envista Holdings Corp. (a)		15,933		444,212
				1,250,214
Household Products & Wares — 1.7%
Spectrum Brands Holdings, Inc.		14,620		1,145,477
				10,116,693

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

	Number of Shares		Value
Energy — 6.3%
Energy – Alternate Sources — 0.2%
Enviva, Inc. (b)		17,762	$	132,682
Oil & Gas — 3.9%
Chord Energy Corp.		3,111		504,200
Earthstone Energy, Inc. Class A (a)		21,552		436,212
Magnolia Oil & Gas Corp. Class A		46,527		1,065,933
Northern Oil & Gas, Inc.		18,234		733,554
				2,739,899
Oil & Gas Services — 2.2%
ChampionX Corp.		41,969		1,494,936
				4,367,517
Financial — 32.1%
Banks — 19.6%
Ameris Bancorp		21,287		817,208
BankUnited, Inc.		19,629		445,578
Columbia Banking System, Inc.		36,814		747,324
CVB Financial Corp.		39,490		654,349
First BanCorp		100,083		1,347,117
First Interstate BancSystem, Inc. Class A		24,163		602,625
First Merchants Corp.		9,555		265,820
FNB Corp.		120,187		1,296,818
Home BancShares, Inc.		58,891		1,233,178
Independent Bank Group, Inc.		3,584		141,747
Old National Bancorp		111,987		1,628,291
Origin Bancorp, Inc.		8,978		259,195
Popular, Inc.		2,649		166,914
Premier Financial Corp.		1,306		22,280
SouthState Corp.		19,837		1,336,220
UMB Financial Corp.		16,235		1,007,382
Valley National Bancorp		120,396		1,030,590
Webster Financial Corp.		14,009		564,703
				13,567,339
Diversified Financial Services — 0.1%
Enact Holdings, Inc.		3,598		97,974
Insurance — 3.0%
Axis Capital Holdings Ltd.		25,008		1,409,701
Fidelis Insurance Holdings Ltd. (a)		22,768		334,234
Selective Insurance Group, Inc.		2,994		308,891
				2,052,826
Investment Companies — 1.7%
Compass Diversified Holdings (b)		62,872		1,180,107
Private Equity — 0.4%
Patria Investments Ltd. Class A		18,444		268,913
Real Estate Investment Trusts (REITS) — 5.3%
CareTrust REIT, Inc.		16,274		333,617
Easterly Government Properties, Inc.		16,250		185,738

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

	Number of Shares		Value
Four Corners Property Trust, Inc.		26,610	$	590,476
Highwoods Properties, Inc.		23,514		484,624
Kite Realty Group Trust		26,074		558,505
National Health Investors, Inc.		6,298		323,465
NETSTREIT Corp.		17,390		270,936
Physicians Realty Trust		37,067		451,847
Summit Hotel Properties, Inc.		17,499		101,494
UMH Properties, Inc.		28,066		393,485
				3,694,187
Savings & Loans — 2.0%
Axos Financial, Inc. (a)		8,398		317,948
Pacific Premier Bancorp, Inc.		35,773		778,421
Provident Financial Services, Inc.		16,951		259,181
				1,355,550
				22,216,896
Industrial — 17.1%
Building Materials — 1.1%
Tecnoglass, Inc.		22,735		749,346
Electrical Components & Equipment — 0.4%
Belden, Inc.		3,217		310,601
Electronics — 4.8%
Atmus Filtration Technologies, Inc. (a)		11,022		229,809
Avnet, Inc.		28,932		1,394,233
Coherent Corp. (a)		42,586		1,390,007
Vontier Corp.		9,851		304,593
				3,318,642
Engineering & Construction — 0.9%
Dycom Industries, Inc. (a)		2,612		232,468
NV5 Global, Inc. (a)		3,714		357,398
				589,866
Environmental Controls — 0.1%
CECO Environmental Corp. (a)		2,477		39,558
Hand & Machine Tools — 0.2%
Luxfer Holdings PLC		10,932		142,663
Machinery – Diversified — 3.3%
Cactus, Inc. Class A		18,830		945,454
DXP Enterprises, Inc. (a)		6,856		239,549
Esab Corp.		1,964		137,912
Gates Industrial Corp. PLC (a)		83,517		969,632
				2,292,547
Metal Fabricate & Hardware — 3.0%
Hillman Solutions Corp. (a)		79,308		654,291
Timken Co.		19,597		1,440,183
				2,094,474

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

	Number of Shares		Value
Miscellaneous - Manufacturing — 0.0%
DIRTT Environmental Solutions (a) (b)		64,423	$	25,801
Packaging & Containers — 3.3%
Graphic Packaging Holding Co.		76,547		1,705,467
Karat Packaging, Inc.		3,643		84,008
Pactiv Evergreen, Inc.		61,561		500,491
				2,289,966
				11,853,464
Technology — 5.9%
Semiconductors — 2.5%
Cohu, Inc. (a)		10,016		344,951
Kulicke & Soffa Industries, Inc.		21,628		1,051,770
MKS Instruments, Inc.		4,001		346,246
				1,742,967
Software — 3.4%
Digital Turbine, Inc. (a)		27,169		164,372
Donnelley Financial Solutions, Inc. (a)		7,374		415,009
IBEX Holdings Ltd. (a)		12,681		195,922
Teradata Corp. (a)		27,600		1,242,552
Verra Mobility Corp. (a)		17,029		318,442
				2,336,297
				4,079,264
Utilities — 1.6%
Electric — 0.5%
ALLETE, Inc.		5,996		316,589
Gas — 1.1%
Northwest Natural Holding Co.		3,763		143,596
Southwest Gas Holdings, Inc.		10,878		657,140
				800,736
				1,117,325
TOTAL COMMON STOCK (Cost $78,127,241)				69,128,211
TOTAL EQUITIES (Cost $78,127,241)				69,128,211
TOTAL LONG-TERM INVESTMENTS (Cost $78,127,241)				69,128,211
SHORT-TERM INVESTMENTS — 0.4%
Investment of Cash Collateral from Securities Loaned — 0.3%
State Street Navigator Securities Lending Government Money Market Portfolio (c)		180,997		180,997

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

	Principal Amount		Value
Repurchase Agreement — 0.1%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (d)	$	101,354	$	101,354
TOTAL SHORT-TERM INVESTMENTS (Cost $282,351)				282,351
TOTAL INVESTMENTS — 100.2% (Cost $78,409,592) (e)				69,410,562
Other Assets/(Liabilities) — (0.2)%				(165,139)
NET ASSETS — 100.0%			$	69,245,423

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 September 30, 2023, was $1,836,597 or 2.65% of net assets. The Fund received $1,701,274 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 $101,367. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $103,402.

(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	12/22/23	USD	329,228	SEK	3,624,672	$	(3,882)

Currency Legend

SEK Swedish Krona

USD U.S. Dollar

MML Small/Mid Cap Value Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.3%
COMMON STOCK — 99.3%
Basic Materials — 3.8%
Chemicals — 1.2%
Element Solutions, Inc.		64,837	$	1,271,453
Huntsman Corp.		8,847		215,867
				1,487,320
Iron & Steel — 1.0%
ATI, Inc. (a)		28,593		1,176,602
Mining — 1.6%
Cameco Corp.		50,034		1,983,348
				4,647,270
Communications — 3.5%
Internet — 2.2%
Criteo SA Sponsored ADR (a)		47,491		1,386,737
Gen Digital, Inc.		76,223		1,347,623
				2,734,360
Media — 1.2%
Nexstar Media Group, Inc. Class A		10,744		1,540,367
Telecommunications — 0.1%
Calix, Inc. (a)		1,495		68,531
				4,343,258
Consumer, Cyclical — 13.6%
Airlines — 1.0%
Alaska Air Group, Inc. (a)		31,596		1,171,580
Apparel — 3.6%
PVH Corp.		22,788		1,743,510
Ralph Lauren Corp.		13,945		1,618,875
Tapestry, Inc.		38,460		1,105,725
				4,468,110
Auto Parts & Equipment — 1.6%
Dana, Inc.		66,632		977,491
Goodyear Tire & Rubber Co. (a)		82,285		1,022,803
				2,000,294

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

	Number of Shares		Value
Home Builders — 2.1%
PulteGroup, Inc.		18,892	$	1,398,952
Taylor Morrison Home Corp. (a)		27,734		1,181,746
				2,580,698
Lodging — 1.0%
Hilton Grand Vacations, Inc. (a)		31,662		1,288,643
Retail — 4.3%
Bath & Body Works, Inc.		44,627		1,508,393
Dine Brands Global, Inc.		23,121		1,143,333
Papa John's International, Inc.		16,401		1,118,876
Sally Beauty Holdings, Inc. (a)		28,528		239,065
Williams-Sonoma, Inc. (b)		8,312		1,291,685
				5,301,352
				16,810,677
Consumer, Non-cyclical — 14.6%
Commercial Services — 6.4%
ABM Industries, Inc.		33,186		1,327,772
ADT, Inc.		251,854		1,511,124
AMN Healthcare Services, Inc. (a)		14,070		1,198,482
Herc Holdings, Inc.		14,070		1,673,486
Korn Ferry		17,010		806,954
Robert Half, Inc.		18,899		1,384,919
				7,902,737
Food — 1.8%
Hain Celestial Group, Inc. (a)		82,020		850,548
Nomad Foods Ltd. (a)		92,433		1,406,830
				2,257,378
Health Care – Products — 3.5%
Avantor, Inc. (a)		64,210		1,353,547
Envista Holdings Corp. (a)		54,726		1,525,761
Integra LifeSciences Holdings Corp. (a)		36,139		1,380,148
				4,259,456
Health Care – Services — 2.9%
Acadia Healthcare Co., Inc. (a)		16,822		1,182,755
Fortrea Holdings, Inc. (a)		41,238		1,178,994
Pediatrix Medical Group, Inc. (a)		92,138		1,171,074
				3,532,823
				17,952,394
Energy — 4.0%
Oil & Gas — 2.6%
HF Sinclair Corp.		24,486		1,393,988
Magnolia Oil & Gas Corp. Class A		76,670		1,756,510
				3,150,498

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

	Number of Shares		Value
Oil & Gas Services — 1.4%
ChampionX Corp.		49,800	$	1,773,876
				4,924,374
Financial — 26.8%
Banks — 10.2%
BankUnited, Inc.		28,147		638,937
Comerica, Inc.		37,974		1,577,820
First BanCorp		115,082		1,549,004
First Citizens BancShares, Inc. Class A		1,513		2,088,091
First Hawaiian, Inc.		89,922		1,623,092
Texas Capital Bancshares, Inc. (a)		24,485		1,442,167
Webster Financial Corp.		27,375		1,103,486
Wintrust Financial Corp.		19,448		1,468,324
Zions Bancorp NA		31,069		1,083,997
				12,574,918
Diversified Financial Services — 3.9%
Cboe Global Markets, Inc.		12,440		1,943,252
Moelis & Co. Class A		27,796		1,254,434
Stifel Financial Corp.		26,351		1,619,005
				4,816,691
Insurance — 5.1%
American Financial Group, Inc.		11,518		1,286,215
Everest Group Ltd.		5,470		2,033,035
Hanover Insurance Group, Inc.		9,488		1,052,978
Kemper Corp.		21,564		906,335
Selective Insurance Group, Inc.		9,967		1,028,296
				6,306,859
Real Estate — 1.2%
Jones Lang LaSalle, Inc. (a)		10,313		1,455,989
Real Estate Investment Trusts (REITS) — 6.4%
Apartment Income REIT Corp.		49,034		1,505,344
Broadstone Net Lease, Inc.		64,008		915,314
CubeSmart		33,384		1,272,932
First Industrial Realty Trust, Inc.		24,904		1,185,181
Physicians Realty Trust		97,724		1,191,256
Ryman Hospitality Properties, Inc.		2,962		246,675
STAG Industrial, Inc.		47,258		1,630,874
				7,947,576
				33,102,033
Industrial — 21.2%
Aerospace & Defense — 0.6%
Spirit AeroSystems Holdings, Inc. Class A		48,736		786,599
Building Materials — 2.1%
Builders FirstSource, Inc. (a)		13,843		1,723,315

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

	Number of Shares		Value
Masonite International Corp. (a)		9,113	$	849,514
				2,572,829
Electrical Components & Equipment — 1.3%
Belden, Inc.		16,164		1,560,634
Electronics — 2.2%
Avnet, Inc.		31,485		1,517,262
Sensata Technologies Holding PLC		31,710		1,199,272
				2,716,534
Engineering & Construction — 4.4%
Dycom Industries, Inc. (a)		19,369		1,723,841
Fluor Corp. (a)		59,310		2,176,677
MasTec, Inc. (a)		21,353		1,536,775
				5,437,293
Environmental Controls — 1.1%
Stericycle, Inc. (a)		30,602		1,368,215
Hand & Machine Tools — 1.0%
Regal Rexnord Corp.		8,927		1,275,490
Machinery – Construction & Mining — 1.3%
Oshkosh Corp.		17,415		1,661,914
Machinery – Diversified — 1.2%
Middleby Corp. (a)		11,083		1,418,624
Packaging & Containers — 1.4%
Berry Global Group, Inc.		27,564		1,706,487
Transportation — 4.6%
ArcBest Corp.		14,630		1,487,140
International Seaways, Inc.		32,117		1,445,265
Knight-Swift Transportation Holdings, Inc.		30,723		1,540,758
Star Bulk Carriers Corp.		63,163		1,217,783
				5,690,946
				26,195,565
Technology — 9.2%
Computers — 2.9%
Crane NXT Co.		18,440		1,024,710
Genpact Ltd.		36,000		1,303,200
Lumentum Holdings, Inc. (a)		27,949		1,262,736
				3,590,646
Semiconductors — 4.0%
Amkor Technology, Inc.		46,640		1,054,064
FormFactor, Inc. (a)		49,020		1,712,759
Kulicke & Soffa Industries, Inc.		14,562		708,150
Synaptics, Inc. (a)		16,232		1,451,790
				4,926,763

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

	Number of Shares		Value
Software — 2.3%
ACI Worldwide, Inc. (a)		58,610	$	1,322,242
CommVault Systems, Inc. (a)		22,246		1,504,052
				2,826,294
				11,343,703
Utilities — 2.6%
Electric — 2.6%
IDACORP, Inc.		19,057		1,784,688
Portland General Electric Co.		34,760		1,407,085
				3,191,773
TOTAL COMMON STOCK (Cost $131,091,182)				122,511,047
TOTAL EQUITIES (Cost $131,091,182)				122,511,047
TOTAL LONG-TERM INVESTMENTS (Cost $131,091,182)				122,511,047
	Principal Amount
SHORT-TERM INVESTMENTS — 0.8%
Repurchase Agreement — 0.8%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (c)	$	948,023		948,023
TOTAL SHORT-TERM INVESTMENTS (Cost $948,023)				948,023
TOTAL INVESTMENTS — 100.1% (Cost $132,039,205) (d)				123,459,070
Other Assets/(Liabilities) — (0.1)%				(98,897)
NET ASSETS — 100.0%			$	123,360,173

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 September 30, 2023, was $1,270,485 or 1.03% of net assets. The Fund received $1,302,162 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 $948,149. Collateralized by U.S. Government Agency obligations with a rate of 0.625%, maturity date of 1/15/26, and an aggregate market value, including accrued interest, of $967,079.

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

MML Sustainable Equity Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Number of Shares		Value
EQUITIES — 99.5%
COMMON STOCK — 99.5%
Basic Materials — 2.3%
Chemicals — 2.3%
Air Products & Chemicals, Inc.		2,299	$	651,537
Ecolab, Inc.		3,236		548,178
Linde PLC (LIN US)		4,766		1,774,620
				2,974,335
Communications — 13.5%
Internet — 10.5%
Airbnb, Inc. Class A (a)		2,634		361,411
Alphabet, Inc. Class A (a)		45,564		5,962,505
Amazon.com, Inc. (a)		26,578		3,378,596
CDW Corp.		6,399		1,291,062
Meta Platforms, Inc. Class A (a)		7,939		2,383,367
Uber Technologies, Inc. (a)		8,352		384,109
				13,761,050
Media — 0.6%
Liberty Media Corp-Liberty Formula One Class C (a)		4,357		271,441
Walt Disney Co. (a)		6,897		559,002
				830,443
Telecommunications — 2.4%
Cisco Systems, Inc.		31,591		1,698,332
Verizon Communications, Inc.		43,347		1,404,876
				3,103,208
				17,694,701
Consumer, Cyclical — 9.4%
Apparel — 0.5%
Deckers Outdoor Corp. (a)		1,236		635,415
Auto Manufacturers — 2.0%
Cummins, Inc.		4,343		992,202
Tesla, Inc. (a)		6,600		1,651,452
				2,643,654
Auto Parts & Equipment — 0.9%
Aptiv PLC (a)		11,654		1,148,968

MML Sustainable Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Distribution & Wholesale — 0.6%
LKQ Corp.		15,532	$	768,989
Retail — 5.4%
CarMax, Inc. (a)		4,659		329,531
Chipotle Mexican Grill, Inc. (a)		166		304,084
Costco Wholesale Corp.		1,570		886,987
Home Depot, Inc.		7,256		2,192,473
Starbucks Corp.		7,258		662,438
Target Corp.		7,019		776,091
TJX Cos., Inc.		16,247		1,444,033
Tractor Supply Co.		2,364		480,010
				7,075,647
				12,272,673
Consumer, Non-cyclical — 19.4%
Beverages — 1.5%
PepsiCo, Inc.		11,579		1,961,946
Biotechnology — 1.2%
Amgen, Inc.		3,654		982,049
Vertex Pharmaceuticals, Inc. (a)		1,534		533,433
				1,515,482
Commercial Services — 0.7%
S&P Global, Inc.		2,271		829,846
Cosmetics & Personal Care — 1.3%
Colgate-Palmolive Co.		6,899		490,588
Procter & Gamble Co.		8,579		1,251,333
				1,741,921
Food — 2.3%
Kroger Co.		18,065		808,409
Mondelez International, Inc. Class A		15,232		1,057,101
Sysco Corp.		17,971		1,186,984
				3,052,494
Health Care – Products — 2.5%
Danaher Corp.		4,665		1,157,387
Intuitive Surgical, Inc. (a)		2,448		715,526
ResMed, Inc.		1,233		182,324
Thermo Fisher Scientific, Inc.		2,379		1,204,178
				3,259,415
Health Care – Services — 2.5%
Humana, Inc.		1,287		626,151
UnitedHealth Group, Inc.		5,293		2,668,678
				3,294,829
Pharmaceuticals — 7.4%
AbbVie, Inc.		10,916		1,627,139
Bristol-Myers Squibb Co.		22,290		1,293,712

MML Sustainable Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Cigna Group		6,462	$	1,848,584
CVS Health Corp.		15,076		1,052,606
Eli Lilly & Co.		1,381		741,776
Merck & Co., Inc.		11,751		1,209,765
Novo Nordisk AS		9,702		882,551
Zoetis, Inc.		6,169		1,073,283
				9,729,416
				25,385,349
Energy — 4.6%
Oil & Gas — 3.1%
ConocoPhillips		18,112		2,169,818
EOG Resources, Inc.		14,553		1,844,738
				4,014,556
Oil & Gas Services — 1.5%
Schlumberger NV		34,427		2,007,094
				6,021,650
Financial — 14.5%
Banks — 4.5%
Bank of America Corp.		39,264		1,075,048
JP Morgan Chase & Co.		14,021		2,033,325
Morgan Stanley		24,240		1,979,681
Regions Financial Corp.		45,145		776,494
				5,864,548
Diversified Financial Services — 5.3%
American Express Co.		4,395		655,690
Ameriprise Financial, Inc.		2,501		824,530
BlackRock, Inc.		1,462		945,168
Intercontinental Exchange, Inc.		5,875		646,368
Mastercard, Inc. Class A		3,895		1,542,069
Visa, Inc. Class A		10,170		2,339,202
				6,953,027
Insurance — 2.5%
Marsh & McLennan Cos., Inc.		5,633		1,071,960
MetLife, Inc.		5,244		329,900
Prudential Financial, Inc.		8,843		839,112
Travelers Cos., Inc.		6,293		1,027,710
				3,268,682
Real Estate Investment Trusts (REITS) — 2.2%
Equinix, Inc.		1,006		730,618
Prologis, Inc.		18,986		2,130,419
				2,861,037
				18,947,294

MML Sustainable Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
Industrial — 9.3%
Aerospace & Defense — 0.9%
Lockheed Martin Corp.		2,823	$	1,154,494
Building Materials — 1.4%
Johnson Controls International PLC		24,070		1,280,764
Masco Corp.		11,455		612,270
				1,893,034
Electrical Components & Equipment — 0.1%
Generac Holdings, Inc. (a)		1,447		157,665
Electronics — 2.3%
Agilent Technologies, Inc.		8,992		1,005,485
Honeywell International, Inc.		5,698		1,052,649
Keysight Technologies, Inc. (a)		6,870		908,970
				2,967,104
Machinery – Diversified — 1.0%
Deere & Co.		1,845		696,266
Xylem, Inc.		6,437		585,960
				1,282,226
Miscellaneous - Manufacturing — 1.6%
Eaton Corp. PLC		6,385		1,361,793
Parker-Hannifin Corp.		2,014		784,493
				2,146,286
Packaging & Containers — 0.4%
Ball Corp.		11,770		585,911
Transportation — 1.6%
Norfolk Southern Corp.		3,090		608,514
Union Pacific Corp.		2,001		407,464
United Parcel Service, Inc. Class B		6,560		1,022,507
				2,038,485
				12,225,205
Technology — 25.1%
Computers — 7.0%
Accenture PLC Class A		4,774		1,466,143
Apple, Inc.		37,898		6,488,517
International Business Machines Corp.		8,155		1,144,146
				9,098,806
Semiconductors — 6.9%
Advanced Micro Devices, Inc. (a)		10,164		1,045,062
Analog Devices, Inc.		5,350		936,732
Applied Materials, Inc.		11,957		1,655,447
ASML Holding NV		1,076		631,869
Globalfoundries, Inc. (a)		5,074		295,256

MML Sustainable Equity Fund —  Portfolio of Investments (Continued)

	Number of Shares		Value
NVIDIA Corp.		10,291	$	4,476,482
				9,040,848
Software — 11.2%
Adobe, Inc. (a)		812		414,039
Cadence Design Systems, Inc. (a)		3,223		755,149
Electronic Arts, Inc.		4,099		493,519
Microsoft Corp.		34,593		10,922,740
Salesforce, Inc. (a)		6,599		1,338,145
ServiceNow, Inc. (a)		603		337,053
Workday, Inc. Class A (a)		2,173		466,869
				14,727,514
				32,867,168
Utilities — 1.4%
Electric — 1.4%
NextEra Energy, Inc.		32,687		1,872,638
TOTAL COMMON STOCK (Cost $107,299,421)				130,261,013
TOTAL EQUITIES (Cost $107,299,421)				130,261,013
MUTUAL FUNDS — 0.3%
Diversified Financial Services — 0.3%
SPDR S&P 500 ETF Trust		995		425,343
TOTAL MUTUAL FUNDS (Cost $432,849)				425,343
TOTAL LONG-TERM INVESTMENTS (Cost $107,732,270)				130,686,356
	Principal Amount
SHORT-TERM INVESTMENTS — 0.3%
Repurchase Agreement — 0.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (b)	$	364,161		364,161
TOTAL SHORT-TERM INVESTMENTS (Cost $364,161)				364,161
TOTAL INVESTMENTS — 100.1% (Cost $108,096,431) (c)				131,050,517
Other Assets/(Liabilities) — (0.1)%				(122,361)
NET ASSETS — 100.0%			$	130,928,156

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 $364,210. Collateralized by U.S. Government Agency obligations with a rate of 0.500%, maturity date of 2/28/26, and an aggregate market value, including accrued interest, of $371,491.

(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.	12/22/23	USD	179,916	EUR	169,262	$	284
JP Morgan Chase Bank N.A.	12/22/23	USD	179,948	EUR	169,262		317
Morgan Stanley & Co. LLC	12/22/23	USD	179,984	EUR	169,262		353
						$	954

Currency Legend

EUR Euro

USD U.S. Dollar

MML Total Return Bond Fund —  Portfolio of Investments

September 30, 2023 (Unaudited)

	Principal Amount		Value
BONDS & NOTES — 113.6%
BANK LOANS — 1.9%
Aerospace & Defense — 0.0%
TransDigm, Inc., 2023 Term Loan I, 3 mo. USD Term SOFR + 3.250%
8.640% VRN 8/24/28	$	78,975	$	78,963
Airlines — 0.0%
United Airlines, Inc., 2021 Term Loan B, 1 mo. USD Term SOFR + 3.750%
9.182% VRN 4/21/28		17,713		17,717
Beverages — 0.1%
City Brewing Co. LLC, Closing Date Term Loan, 3 mo. USD Term SOFR + 3.500%
9.070% VRN 4/05/28		36,217		23,631
Naked Juice LLC
Term Loan, 3 mo. USD Term SOFR + 3.250%
8.740% VRN 1/24/29		140,311		132,961
2nd Lien Term Loan, 3 mo. USD Term SOFR + 6.000%
11.490% VRN 1/24/30		28,134		22,710
				179,302
Chemicals — 0.0%
Chemours Co., 2023 USD Term Loan B, 1 mo. USD Term SOFR + 2.500%
8.816% VRN 8/18/28		117,417		115,949
Commercial Services — 0.1%
Element Materials Technology Group US Holdings, Inc.
2022 USD Delayed Draw Term Loan, 3 mo. USD Term SOFR + 4.250%
9.740% VRN 7/06/29		9,398		9,269
2022 USD Term Loan, 3 mo. USD Term SOFR + 4.250%
9.740% VRN 7/06/29		20,363		20,083
Pre-Paid Legal Services, Inc., 2021 Term Loan, 1 mo. USD Term SOFR + 3.500%
8.931% VRN 12/15/28		43,580		43,090
Prime Security Services Borrower LLC
2023 Term Loan A2023 Term Loan A,
0.000% 3/14/28 (a)		25,000		24,500
2021 Term Loan, 1 mo. USD Term SOFR + 2.750%
8.192% VRN 9/23/26		46,470		46,386
Spin Holdco, Inc., 2021 Term Loan, 3 mo. USD Term SOFR + 4.000%
9.664% VRN 3/04/28		111,978		96,546
Trans Union LLC, 2021 Term Loan B6, 1 mo. USD Term SOFR + 2.250%
7.681% VRN 12/01/28		85,515		85,398
TruGreen Ltd. Partnership, 2020 Term Loan, 1 mo. USD Term SOFR + 4.000%
9.416% VRN 11/02/27		23,974		22,739
				348,011

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%
9.431% VRN 1/29/27	$	29,010	$	28,732
Peraton Corp., Term Loan B, 1 mo. USD Term SOFR + 3.750%
9.166% VRN 2/01/28		95,873		95,574
				124,306
Cosmetics & Personal Care — 0.0%
Sunshine Luxembourg VII Sarl, 2021 Term Loan B3, 3 mo. USD Term SOFR + 3.750%
9.240% VRN 10/01/26		48,272		48,165
Distribution & Wholesale — 0.0%
Patriot Container Corp., 2018 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.750%
9.166% VRN 3/20/25		7,281		6,900
Diversified Financial Services — 0.1%
Deerfield Dakota Holding LLC, 2020 USD Term Loan B, 3 mo. USD Term SOFR + 3.750%
9.140% VRN 4/09/27		58,409		56,889
Setanta Aircraft Leasing Designated Activity Co., Term Loan B, 3 mo. USD Term SOFR + 2.000%
7.652% VRN 11/05/28		175,000		174,809
				231,698
Electronics — 0.0%
II-VI, Inc., 2022 Term Loan B, 1 mo. USD Term SOFR + 2.750%
8.181% VRN 7/02/29		85,009		84,638
Entertainment — 0.1%
Churchill Downs, Inc., 2021 Incremental Term Loan B1, 1 mo. USD Term SOFR + 2.000%
7.416% VRN 3/17/28		49,745		49,652
Delta 2 (LUX) Sarl, 2022 Term Loan B, 1 mo. USD Term SOFR + 3.000%
8.316% VRN 1/15/30		5,655		5,650
PENN Entertainment, Inc., 2022 Term Loan B, 1 mo. USD Term SOFR + 2.750%
8.166% VRN 5/03/29		22,235		22,187
Scientific Games International, Inc., 2022 USD Term Loan, 1 mo. USD Term SOFR + 3.000%
8.434% VRN 4/14/29		45,028		44,972
William Morris Endeavor Entertainment LLC, 2018 1st Lien Term Loan, 1 mo. USD Term SOFR + 2.750%
8.181% VRN 5/18/25		119,616		119,300
				241,761
Environmental Controls — 0.0%
Filtration Group Corp., 2023 USD Term Loan, 1 mo. USD Term SOFR + 4.250%
9.681% VRN 10/21/28		21,663		21,672
Food — 0.0%
8th Avenue Food & Provisions, Inc., 2018 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.750%
9.181% VRN 10/01/25		7,281		6,989

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%
7.666% VRN 1/29/27	$	20,312	$	20,143
H Food Holdings LLC, 2018 Term Loan B, 3 mo. USD LIBOR + 3.688%
9.269% VRN 5/23/25		12,454		10,821
Hostess Brands LLC, 2023 Term Loan B, 3 mo. USD Term SOFR + 2.500%
7.890% VRN 6/28/30		69,371		69,443
				107,396
Health Care – Products — 0.1%
Avantor Funding, Inc., 2021 Term Loan B5, 1 mo. USD Term SOFR + 2.250%
7.666% VRN 11/08/27		62,530		62,445
Bausch & Lomb Corp.
2023 Incremental Term Loan,
0.000% 9/14/28 (a)		28,195		27,808
Term Loan, 3 mo. USD Term SOFR + 3.250%
8.755% VRN 5/10/27		42,629		41,374
Medline Borrower LP, USD Term Loan B, 1 mo. USD Term SOFR + 3.250%
8.681% VRN 10/23/28		171,440		170,874
				302,501
Health Care – Services — 0.0%
ICON Luxembourg Sarl, LUX Term Loan, 3 mo. USD Term SOFR + 2.250%
7.902% VRN 7/03/28		39,569		39,537
IQVIA, Inc., 2018 USD Term Loan B3, 3 mo. USD Term SOFR + 1.750%
7.402% VRN 6/11/25		49,883		49,990
Star Parent, Inc. ., 2023 Term Loan B,
0.000% 9/19/30 (a)		23,986		23,423
				112,950
Home Furnishing — 0.0%
AI Aqua Merger Sub, Inc., 2021 1st Lien Term Loan B, 3 mo. USD Term SOFR + 3.750%
9.084% VRN 7/31/28		41,346		40,887
Insurance — 0.1%
Acrisure LLC, 2020 Term Loan B, 1 mo. USD LIBOR + 3.500%
8.931% VRN 2/15/27		98,219		96,710
AmWINS Group, Inc., 2021 Term Loan B, 1 mo. USD Term SOFR + 2.250%
7.681% VRN 2/19/28		173,307		172,106
Asurion LLC, 2020 Term Loan B8, 3 mo. USD Term SOFR + 3.250%
8.681% VRN 12/23/26		56,998		55,716
				324,532
Internet — 0.1%
Arches Buyer, Inc., 2021 Term Loan B, 1 mo. USD Term SOFR + 3.250%
8.666% VRN 12/06/27		24,917		24,357
Gen Digital, Inc., 2021 Term Loan A, 1 mo. USD Term SOFR + 1.500%
6.916% VRN 9/10/27		109,841		108,812
MH Sub I LLC, 2023 Term Loan, 1 mo. USD Term SOFR + 4.250%
9.566% VRN 5/03/28		31,398		30,333
Proofpoint, Inc., 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.250%
8.681% VRN 8/31/28		4,937		4,891
				168,393

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

	Principal Amount		Value
Investment Companies — 0.0%
Mativ Holdings, Inc., Delayed Draw Term Loan A,
0.000% 5/06/27 (a)	$	40,629	$	39,410
Lodging — 0.0%
Fertitta Entertainment LLC, 2022 Term Loan B, 1 mo. USD Term SOFR + 4.000%
9.316% VRN 1/27/29		73,503		72,676
Hilton Domestic Operating Co., Inc., 2019 Term Loan B2, 1 mo. USD Term SOFR + 1.750%
7.170% VRN 6/22/26		12,879		12,866
				85,542
Machinery – Diversified — 0.0%
ASP Blade Holdings, Inc., Initial Term Loan, 1 mo. USD Term SOFR + 4.000%
9.652% VRN 10/13/28		39,715		34,937
Media — 0.1%
CSC Holdings LLC, 2019 Term Loan B5, 1 mo. USD Term SOFR + 2.500%
7.947% VRN 4/15/27		47,300		42,727
DirecTV Financing LLC, Term Loan, 1 mo. USD Term SOFR + 5.000%
10.431% VRN 8/02/27		139,400		136,070
Virgin Media Bristol LLC, 2023 USD Term Loan Y, 3 mo. USD Term SOFR + 3.250%
8.311% VRN 3/31/31		150,000		146,143
				324,940
Packaging & Containers — 0.1%
Berry Global, Inc., 2021 Term Loan Z, 3 mo. USD Term SOFR + 1.750%
7.293% VRN 7/01/26		135,651		135,577
Pharmaceuticals — 0.4%
Elanco Animal Health, Inc., Term Loan B, 1 mo. USD Term SOFR + 1.750%
7.180% VRN 8/01/27		167,591		164,215
Gainwell Acquisition Corp., Term Loan B, 3 mo. USD Term SOFR + 4.000%
9.490% VRN 10/01/27		98,232		95,684
Grifols Worldwide Operations USA, Inc., USD 2019 Term Loan B, 1 mo. USD Term SOFR + 2.000%
7.416% VRN 11/15/27		241,990		237,695
Horizon Therapeutics USA, Inc., 2021 Term Loan B2, 1 mo. USD Term SOFR + 1.750%
7.184% VRN 3/15/28		226,197		225,876
Jazz Financing Lux Sarl, USD Term Loan, 1 mo. USD Term SOFR + 3.500%
8.931% VRN 5/05/28		138,905		138,770
Organon & Co., USD Term Loan, 1 mo. USD Term SOFR + 3.000%
8.442% VRN 6/02/28		252,592		251,834
PRA Health Sciences, Inc., US Term Loan, 3 mo. USD Term SOFR + 2.250%
7.902% VRN 7/03/28		9,859		9,851
				1,123,925
Private Equity — 0.0%
GTCR W Merger Sub LLC, USD Term Loan B,
0.000% 9/20/30 (a)		68,265		68,215

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

	Principal Amount		Value
Retail — 0.2%
1011778 BC Unlimited Liability Co., 2023 Term Loan B5, 1 mo. USD Term SOFR + 2.250%
7.566% VRN 9/23/30	$	43,372	$	43,183
KFC Holding Co., 2021 Term Loan B, 1 mo. USD Term SOFR + 1.750%
7.195% VRN 3/15/28		39,116		39,053
Michaels Cos., Inc., 2021 Term Loan B, 3 mo. USD Term SOFR + 4.250%
9.902% VRN 4/15/28		234,600		213,592
Whatabrands LLC, 2021 Term Loan B, 1 mo. USD Term SOFR + 3.000%
8.431% VRN 8/03/28		221,063		219,981
				515,809
Semiconductors — 0.0%
Entegris, Inc., 2023 Term Loan B, 1 mo. USD Term SOFR + 2.500%, 3 mo. USD Term SOFR + 2.500%
7.816% - 7.890% 7/06/29		8,104		8,101
Software — 0.3%
Athenahealth Group, Inc., 2022 Term Loan B, 1 mo. USD Term SOFR + 3.250%
8.568% VRN 2/15/29		236,254		231,456
CDK Global, Inc., 2022 USD Term Loan B, 3 mo. USD Term SOFR + 4.250%
9.640% VRN 7/06/29		48,018		47,992
EagleView Technology Corp., 2018 Add On Term Loan B,
0.000% 8/14/25 (a)		5,242		4,941
Open Text Corp.
Term Loan B, 1 mo. USD Term SOFR + 1.750%
7.166% VRN 5/30/25		26,077		26,075
2023 Term Loan B, 1 mo. USD Term SOFR + 2.750%
8.166% VRN 1/31/30		54,049		54,025
Oracle Corp., Term Loan A1, 1 mo. USD Term SOFR + 1.600%
6.925% VRN 8/16/27		195,574		194,352
RealPage, Inc., 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.000%
8.431% VRN 4/24/28		14,317		14,138
Renaissance Holding Corp., 2023 Refi Term Loan, 3 mo. USD Term SOFR + 4.750%
10.066% VRN 4/05/30		40,534		40,165
Sophia, LP, 2021 Term Loan B, 1 mo. USD Term SOFR + 3.500%
8.916% VRN 10/07/27		21,276		21,209
SS&C Technologies, Inc., 2018 Term Loan B5,
0.000% 4/16/25 (a)		122,069		121,998
				756,351
Telecommunications — 0.1%
Frontier Communications Corp., 2021 1st Lien Term Loan, 1 mo. USD Term SOFR + 3.750%
9.181% VRN 10/08/27		22,782		22,082
SBA Senior Finance II LLC, 2018 Term Loan B, 1 mo. USD Term SOFR + 1.750%
7.170% VRN 4/11/25		69,783		69,711
Zayo Group Holdings, Inc., 2022 USD Incremental Term Loan B, 1 mo. USD Term SOFR + 4.325%
9.641% VRN 3/09/27		112,263		90,961
				182,754

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

	Principal Amount		Value
Transportation — 0.0%
Genesee & Wyoming, Inc., Term Loan, 3 mo. USD Term SOFR + 2.000%
7.490% VRN 12/30/26	$	41,567	$	41,476
TOTAL BANK LOANS (Cost $5,909,008)				5,872,778
CORPORATE DEBT — 26.0%
Aerospace & Defense — 0.0%
TransDigm, Inc.
6.750% 8/15/28 (b)		100,000		98,449
Agriculture — 0.8%
BAT Capital Corp.
4.390% 8/15/37		400,000		306,083
4.540% 8/15/47		1,050,000		722,759
4.758% 9/06/49		34,000		23,912
5.650% 3/16/52		185,000		148,110
Imperial Brands Finance PLC
3.125% 7/26/24 (b)		320,000		311,843
3.500% 7/26/26 (b)		225,000		210,560
4.250% 7/21/25 (b)		415,000		399,748
Reynolds American, Inc.
5.850% 8/15/45		315,000		260,924
				2,383,939
Airlines — 0.2%
United Airlines Pass-Through Trust
5.800% 7/15/37		665,000		646,440
Banks — 10.1%
Bank of America Corp.
Secured Overnight Financing Rate + 0.910% 1.658% VRN 3/11/27		755,000		677,381
Secured Overnight Financing Rate + 0.960% 1.734% VRN 7/22/27		160,000		141,785
Secured Overnight Financing Rate + 1.370% 1.922% VRN 10/24/31		110,000		82,988
Secured Overnight Financing Rate + 1.060% 2.087% VRN 6/14/29		1,000,000		837,134
Secured Overnight Financing Rate + 1.220% 2.299% VRN 7/21/32		375,000		284,149
Secured Overnight Financing Rate + 1.050% 2.551% VRN 2/04/28		635,000		566,213
Secured Overnight Financing Rate + 1.210% 2.572% VRN 10/20/32		435,000		334,251
Secured Overnight Financing Rate + 2.150% 2.592% VRN 4/29/31		140,000		112,503
3 mo. USD Term SOFR + 1.302% 3.419% VRN 12/20/28		470,000		421,613
3 mo. USD Term SOFR + 1.837% 3.824% VRN 1/20/28		415,000		385,386
3 mo. USD Term SOFR + 1.332% 3.970% VRN 3/05/29		485,000		444,272
Citigroup, Inc.
Secured Overnight Financing Rate + 0.669% 0.981% VRN 5/01/25		85,000		82,264
Secured Overnight Financing Rate + 0.770% 1.462% VRN 6/09/27		540,000		477,324
Secured Overnight Financing Rate + 1.167% 2.561% VRN 5/01/32		580,000		448,976
Secured Overnight Financing Rate + 2.107% 2.572% VRN 6/03/31		255,000		203,339
Secured Overnight Financing Rate + 1.422% 2.976% VRN 11/05/30		150,000		125,589
Secured Overnight Financing Rate + 1.351% 3.057% VRN 1/25/33		640,000		505,944
3 mo. USD Term SOFR + 1.454% 4.075% VRN 4/23/29		525,000		483,179
Goldman Sachs Group, Inc.
Secured Overnight Financing Rate + 0.486% 0.925% VRN 10/21/24		530,000		525,814
1.217% 12/06/23		860,000		852,873
Secured Overnight Financing Rate + 0.798% 1.431% VRN 3/09/27		500,000		445,145
Secured Overnight Financing Rate + 0.818% 1.542% VRN 9/10/27		1,450,000		1,269,612
Secured Overnight Financing Rate + 1.090% 1.992% VRN 1/27/32		140,000		104,947
Secured Overnight Financing Rate + 1.248% 2.383% VRN 7/21/32		285,000		217,053

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

	Principal Amount		Value
Secured Overnight Financing Rate + 1.264% 2.650% VRN 10/21/32	$	40,000	$	30,875
HSBC Holdings PLC
Secured Overnight Financing Rate + 1.732% 2.013% VRN 9/22/28		1,555,000		1,319,843
Secured Overnight Financing Rate + 1.285% 2.206% VRN 8/17/29		610,000		502,781
Secured Overnight Financing Rate + 2.650% 6.332% VRN 3/09/44		360,000		345,671
JP Morgan Chase & Co.
3 mo. USD Term SOFR + 0.580% 0.969% VRN 6/23/25		1,060,000		1,017,264
Secured Overnight Financing Rate + 0.885% 1.578% VRN 4/22/27		660,000		589,005
Secured Overnight Financing Rate + 1.015% 2.069% VRN 6/01/29		1,500,000		1,263,911
Secured Overnight Financing Rate + 1.180% 2.545% VRN 11/08/32		115,000		88,998
3 mo. USD Term SOFR + 1.250% 2.580% VRN 4/22/32		510,000		402,301
3 mo. USD Term SOFR + 1.510% 2.739% VRN 10/15/30		230,000		192,341
Lloyds Banking Group PLC
1 yr. CMT + 0.850% 1.627% VRN 5/11/27		515,000		456,768
3 mo. USD LIBOR + 1.205% 3.574% VRN 11/07/28		720,000		643,126
1 yr. CMT + 3.500% 3.870% VRN 7/09/25		220,000		215,717
1 yr. CMT + 2.300% 4.976% VRN 8/11/33		225,000		199,671
Macquarie Group Ltd.
Secured Overnight Financing Rate + 1.532% 2.871% VRN 1/14/33 (b)		780,000		589,522
Secured Overnight Financing Rate + 2.405% 4.442% VRN 6/21/33 (b)		240,000		204,441
Morgan Stanley
Secured Overnight Financing Rate + 0.560% 1.164% VRN 10/21/25		1,300,000		1,227,160
Secured Overnight Financing Rate + 0.879% 1.593% VRN 5/04/27		340,000		302,627
Secured Overnight Financing Rate + 1.020% 1.928% VRN 4/28/32		295,000		219,126
Secured Overnight Financing Rate + 1.178% 2.239% VRN 7/21/32		145,000		109,284
Secured Overnight Financing Rate + 1.360% 2.484% VRN 9/16/36		495,000		359,562
NatWest Group PLC 3 mo. USD LIBOR + 1.762%
4.269% VRN 3/22/25		185,000		183,018
PNC Financial Services Group, Inc.
Secured Overnight Financing Rate + 1.933% 5.068% VRN 1/24/34		655,000		593,986
Secured Overnight Financing Rate + 1.841% 5.582% VRN 6/12/29		165,000		160,069
Secured Overnight Financing Rate Index + 2.140% 6.037% VRN 10/28/33		115,000		111,604
Santander UK Group Holdings PLC
Secured Overnight Financing Rate + 0.787% 1.089% VRN 3/15/25		540,000		525,415
1 yr. CMT + 1.250% 1.532% VRN 8/21/26		710,000		643,581
Secured Overnight Financing Rate + 0.989% 1.673% VRN 6/14/27		120,000		104,964
Secured Overnight Financing Rate + 1.220% 2.469% VRN 1/11/28		200,000		174,061
Santander UK PLC
5.000% 11/07/23 (b)		435,000		433,917
UBS Group AG
Secured Overnight Financing Rate Index + 0.980% 1.305% VRN 2/02/27 (b)		610,000		540,953
1 yr. CMT + 0.850% 1.494% VRN 8/10/27 (b)		65,000		56,736
Secured Overnight Financing Rate + 1.560% 2.593% VRN 9/11/25 (b)		55,000		52,936
Secured Overnight Financing Rate + 1.730% 3.091% VRN 5/14/32 (b)		860,000		679,270
3 mo. USD LIBOR + 1.410% 3.869% VRN 1/12/29 (b)		65,000		58,876
Secured Overnight Financing Rate + 3.340% 6.373% VRN 7/15/26 (b)		180,000		179,322
Secured Overnight Financing Rate + 3.920% 6.537% VRN 8/12/33 (b)		1,795,000		1,774,022
Secured Overnight Financing Rate + 5.020% 9.016% VRN 11/15/33 (b)		810,000		935,400
US Bancorp
Secured Overnight Financing Rate + 1.600% 4.839% VRN 2/01/34		755,000		664,745
Secured Overnight Financing Rate + 2.260% 5.836% VRN 6/12/34		190,000		179,198
Secured Overnight Financing Rate + 2.090% 5.850% VRN 10/21/33		140,000		132,527
Wells Fargo & Co.
Secured Overnight Financing Rate + 2.100% 2.393% VRN 6/02/28		1,120,000		982,205
3 mo. USD Term SOFR + 1.432% 2.879% VRN 10/30/30		490,000		407,903
Secured Overnight Financing Rate + 1.500% 3.350% VRN 3/02/33		925,000		747,718
Secured Overnight Financing Rate + 1.510% 3.526% VRN 3/24/28		655,000		601,535

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

	Principal Amount		Value
Secured Overnight Financing Rate + 2.100% 4.897% VRN 7/25/33	$	400,000	$	362,000
3 mo. USD Term SOFR + 4.502% 5.013% VRN 4/04/51		150,000		126,035
				31,721,724
Beverages — 0.2%
Bacardi Ltd.
4.450% 5/15/25 (b)		485,000		470,628
Triton Water Holdings, Inc.
6.250% 4/01/29 (b) (c)		178,000		145,515
				616,143
Biotechnology — 0.2%
Amgen, Inc.
4.200% 2/22/52		145,000		108,599
5.250% 3/02/33		315,000		301,127
5.600% 3/02/43		170,000		158,046
5.750% 3/02/63		32,000		29,519
				597,291
Chemicals — 0.3%
International Flavors & Fragrances, Inc.
2.300% 11/01/30 (b)		570,000		428,790
3.268% 11/15/40 (b)		30,000		18,783
3.468% 12/01/50 (b)		65,000		37,807
4.375% 6/01/47		65,000		43,652
5.000% 9/26/48		385,000		286,904
SK Invictus Intermediate II Sarl
5.000% 10/30/29 (b) (c)		32,000		25,646
Valvoline, Inc.
3.625% 6/15/31 (b)		200,000		154,951
				996,533
Commercial Services — 0.2%
Adtalem Global Education, Inc.
5.500% 3/01/28 (b)		37,000		33,887
Global Payments, Inc.
4.875% 3/17/31 EUR (d)		100,000		102,922
5.400% 8/15/32		225,000		210,904
5.950% 8/15/52		126,000		112,968
Upbound Group, Inc.
6.375% 2/15/29 (b) (c)		35,000		31,063
WASH Multifamily Acquisition, Inc.
5.750% 4/15/26 (b)		35,000		32,681
				524,425
Computers — 0.1%
NCR Corp.
5.250% 10/01/30 (b)		235,000		202,519
Diversified Financial Services — 1.1%
AerCap Ireland Capital DAC/AerCap Global Aviation Trust
3.300% 1/30/32		615,000		488,871
3.500% 1/15/25		1,000,000		964,655
Air Lease Corp.
5.850% 12/15/27		355,000		350,194

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

	Principal Amount		Value
American Express Co.
2.550% 3/04/27	$	310,000	$	279,502
Avolon Holdings Funding Ltd.
2.528% 11/18/27 (b)		389,000		328,375
2.875% 2/15/25 (b)		335,000		316,273
3.950% 7/01/24 (b)		130,000		127,243
Capital One Financial Corp. Secured Overnight Financing Rate + 1.790%
3.273% VRN 3/01/30		535,000		447,527
Park Aerospace Holdings Ltd.
5.500% 2/15/24 (b)		82,000		81,591
				3,384,231
Electric — 1.5%
Arizona Public Service Co.
6.350% 12/15/32		675,000		689,907
Duke Energy Carolinas LLC
4.000% 9/30/42		1,000,000		766,569
Florida Power & Light Co.
3.990% 3/01/49		495,000		371,899
Jersey Central Power & Light Co.
4.700% 4/01/24 (b)		800,000		792,620
6.400% 5/15/36		425,000		413,582
MidAmerican Energy Co.
4.800% 9/15/43		1,400,000		1,194,190
Southwestern Electric Power Co.
3.250% 11/01/51		170,000		102,100
TenneT Holding BV
2.750% 5/17/42 EUR (b) (d)		190,000		168,832
4.500% 10/28/34 EUR (b) (d)		245,000		272,422
4.750% 10/28/42 EUR (b) (d)		100,000		111,198
				4,883,319
Engineering & Construction — 0.1%
Artera Services LLC
9.033% 12/04/25 (b)		95,000		87,638
Cellnex Finance Co. SA
2.000% 9/15/32 EUR (b) (d)		100,000		82,418
				170,056
Entertainment — 0.5%
Warnermedia Holdings, Inc.
4.279% 3/15/32		190,000		161,276
5.050% 3/15/42		905,000		699,916
5.141% 3/15/52		910,000		676,167
				1,537,359
Environmental Controls — 0.1%
Waste Pro USA, Inc.
5.500% 2/15/26 (b)		175,000		163,411
Food — 0.8%
JBS USA LUX SA/JBS USA Food Co./JBS Luxembourg Sarl
6.750% 3/15/34 (b)		640,000		622,714
JBS USA LUX SA/JBS USA Food Co./JBS USA Finance, Inc.
4.375% 2/02/52		135,000		89,718
5.750% 4/01/33		320,000		292,660

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

	Principal Amount		Value
6.500% 12/01/52	$	415,000	$	371,548
Pilgrim's Pride Corp.
3.500% 3/01/32		403,000		311,641
5.875% 9/30/27 (b)		30,000		30,436
6.250% 7/01/33		45,000		42,290
Post Holdings, Inc.
5.750% 3/01/27 (b)		150,000		144,072
Simmons Foods, Inc./Simmons Prepared Foods, Inc./Simmons Pet Food, Inc./Simmons Feed
4.625% 3/01/29 (b)		150,000		123,049
Smithfield Foods, Inc.
2.625% 9/13/31 (b)		635,000		455,300
				2,483,428
Gas — 0.3%
KeySpan Gas East Corp.
5.994% 3/06/33 (b)		630,000		607,970
National Gas Transmission PLC
4.250% 4/05/30 EUR (b) (d)		100,000		103,968
Piedmont Natural Gas Co., Inc.
5.400% 6/15/33		155,000		147,777
				859,715
Health Care – Products — 0.2%
Medtronic Global Holdings SCA
3.375% 10/15/34 EUR (d)		100,000		97,927
Revvity, Inc.
2.250% 9/15/31		800,000		608,022
				705,949
Health Care – Services — 1.3%
Centene Corp.
2.450% 7/15/28		488,000		412,284
3.000% 10/15/30		453,000		365,394
4.250% 12/15/27		230,000		212,039
CommonSpirit Health
2.782% 10/01/30		290,000		238,702
Fortrea Holdings, Inc.
7.500% 7/01/30 (b)		50,000		48,651
Fresenius Medical Care US Finance III, Inc.
1.875% 12/01/26 (b)		340,000		296,514
HCA, Inc.
2.375% 7/15/31		90,000		68,885
3.500% 7/15/51		182,000		113,657
5.000% 3/15/24		287,000		285,517
5.250% 6/15/49		775,000		636,653
5.500% 6/15/47		310,000		264,604
Kedrion SpA
6.500% 9/01/29 (b)		250,000		214,375
ModivCare Escrow Issuer, Inc.
5.000% 10/01/29 (b) (c)		300,000		215,250
ModivCare, Inc.
5.875% 11/15/25 (b)		75,000		71,292
Molina Healthcare, Inc.
4.375% 6/15/28 (b)		300,000		268,814

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

	Principal Amount		Value
Universal Health Services, Inc.
1.650% 9/01/26	$	385,000	$	339,363
				4,051,994
Household Products & Wares — 0.0%
Central Garden & Pet Co.
5.125% 2/01/28		123,000		114,710
Insurance — 1.0%
Alliant Holdings Intermediate LLC/Alliant Holdings Co-Issuer
6.750% 10/15/27 (b) (c)		35,000		32,550
Aon Corp./Aon Global Holdings PLC
3.900% 2/28/52		190,000		135,790
Arthur J Gallagher & Co.
5.750% 3/02/53		310,000		283,958
Athene Global Funding
1.985% 8/19/28 (b)		555,000		452,575
3.205% 3/08/27 (b)		135,000		120,935
Secured Overnight Financing Rate Index + 0.700% 6.043% FRN 5/24/24 (b)		505,000		502,923
Farmers Exchange Capital III 3 mo. USD LIBOR + 3.454%
5.454% VRN 10/15/54 (b)		970,000		825,640
Metropolitan Life Global Funding I
5.150% 3/28/33 (b)		210,000		198,860
Teachers Insurance & Annuity Association of America
3.300% 5/15/50 (b)		225,000		142,241
4.270% 5/15/47 (b)		130,000		99,067
Willis North America, Inc.
2.950% 9/15/29		290,000		247,164
				3,041,703
Internet — 0.1%
Netflix, Inc.
4.625% 5/15/29 EUR (d)		150,000		159,904
Northwest Fiber LLC/Northwest Fiber Finance Sub, Inc.
4.750% 4/30/27 (b)		33,000		29,370
Tencent Holdings Ltd.
3.680% 4/22/41 (b)		335,000		231,459
				420,733
Machinery – Diversified — 0.0%
OT Merger Corp.
7.875% 10/15/29 (b)		90,000		55,073
Media — 0.9%
Cable One, Inc.
4.000% 11/15/30 (b) (c)		75,000		57,135
Charter Communications Operating LLC/Charter Communications Operating Capital
3.750% 2/15/28		92,000		82,957
4.800% 3/01/50		330,000		230,758
4.908% 7/23/25		205,000		200,316
5.250% 4/01/53 (c)		265,000		198,088
5.375% 5/01/47		95,000		72,392
5.750% 4/01/48		280,000		223,569
Cox Communications, Inc.
2.600% 6/15/31 (b)		385,000		299,915

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

	Principal Amount		Value
CSC Holdings LLC
5.750% 1/15/30 (b)	$	100,000	$	56,030
6.500% 2/01/29 (b)		553,000		458,125
7.500% 4/01/28 (b) (c)		32,000		20,778
Diamond Sports Group LLC/Diamond Sports Finance Co.
5.375% 8/15/26 (b)		422,000		8,440
Time Warner Cable LLC
5.500% 9/01/41		535,000		418,495
5.875% 11/15/40		170,000		140,854
VZ Secured Financing BV
5.000% 1/15/32 (b)		420,000		329,933
				2,797,785
Oil & Gas — 0.3%
KazMunayGas National Co. JSC
4.750% 4/19/27 (b)		200,000		187,095
Pertamina Persero PT
3.100% 8/27/30 (b)		200,000		166,600
Petroleos Mexicanos
5.950% 1/28/31		50,000		35,787
6.625% 6/15/35		900,000		602,821
7.690% 1/23/50		115,000		73,873
Shell International Finance BV
3.750% 9/12/46		25,000		18,454
				1,084,630
Oil & Gas Services — 0.0%
Archrock Partners LP/Archrock Partners Finance Corp.
6.250% 4/01/28 (b)		35,000		32,586
Packaging & Containers — 0.6%
Amcor Finance USA, Inc.
3.625% 4/28/26		650,000		613,719
Ardagh Packaging Finance PLC/Ardagh Holdings USA, Inc.
5.250% 8/15/27 (b)		190,000		158,554
5.250% 8/15/27 (b) (c)		100,000		83,450
Berry Global, Inc.
1.570% 1/15/26		394,000		356,150
1.650% 1/15/27		12,000		10,314
4.875% 7/15/26 (b)		330,000		315,866
Trivium Packaging Finance BV
5.500% 8/15/26 (b)		320,000		298,379
				1,836,432
Pharmaceuticals — 0.7%
1375209 BC Ltd.
9.000% 1/30/28 (b) (c)		30,000		29,654
Bayer US Finance II LLC
4.375% 12/15/28 (b)		893,000		830,066
4.625% 6/25/38 (b)		795,000		652,563
4.875% 6/25/48 (b)		210,000		167,473
Cigna Group
3.400% 3/15/51		250,000		163,645
CVS Health Corp.
5.050% 3/25/48		195,000		162,015

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

	Principal Amount		Value
Grifols SA
4.750% 10/15/28 (b) (c)	$	101,000	$	86,114
				2,091,530
Pipelines — 0.7%
Energy Transfer LP
4.950% 6/15/28		125,000		119,627
5.000% 5/15/50		305,000		239,256
5.150% 3/15/45		400,000		322,286
5.350% 5/15/45		50,000		41,000
5.400% 10/01/47		394,000		324,951
Galaxy Pipeline Assets Bidco Ltd.
2.160% 3/31/34 (b)		177,420		147,811
Plains All American Pipeline LP/PAA Finance Corp.
3.800% 9/15/30		300,000		257,684
Rockies Express Pipeline LLC
4.800% 5/15/30 (b)		250,000		215,713
4.950% 7/15/29 (b)		200,000		178,139
TransCanada PipeLines Ltd.
4.625% 3/01/34		35,000		30,488
TransMontaigne Partners LP/TLP Finance Corp.
6.125% 2/15/26		181,000		154,529
Venture Global Calcasieu Pass LLC
3.875% 8/15/29 (b)		365,000		307,140
				2,338,624
Real Estate — 0.2%
Annington Funding PLC
3.184% 7/12/29 GBP (b) (d)		200,000		202,795
3.685% 7/12/34 GBP (b) (d)		100,000		93,131
Blackstone Property Partners Europe Holdings Sarl
1.625% 4/20/30 EUR (b) (d)		200,000		156,636
1.750% 3/12/29 EUR (b) (d)		200,000		165,590
Vonovia Finance BV
2.250% 4/07/30 EUR (b) (d)		100,000		89,000
Vonovia SE
1.500% 6/14/41 EUR (b) (d)		100,000		57,614
				764,766
Real Estate Investment Trusts (REITS) — 2.0%
American Homes 4 Rent LP
3.375% 7/15/51		205,000		123,036
4.300% 4/15/52		160,000		115,726
American Tower Corp.
1.000% 1/15/32 EUR (d)		100,000		79,004
2.700% 4/15/31		80,000		63,445
5.550% 7/15/33		345,000		328,738
5.650% 3/15/33		475,000		456,602
CapitaLand Ascendas REIT
0.750% 6/23/28 EUR (b) (d)		185,000		157,951
CubeSmart LP
2.500% 2/15/32		360,000		273,870
Digital Intrepid Holding BV
0.625% 7/15/31 EUR (b) (d)		425,000		320,360
Extra Space Storage LP
2.350% 3/15/32		275,000		207,872

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

	Principal Amount		Value
2.400% 10/15/31	$	76,000	$	58,183
2.550% 6/01/31		130,000		101,204
GLP Capital LP/GLP Financing II, Inc.
3.250% 1/15/32		317,000		246,020
4.000% 1/15/30		37,000		31,378
4.000% 1/15/31		75,000		62,439
5.375% 4/15/26		540,000		523,575
Healthcare Realty Holdings LP
2.000% 3/15/31		200,000		149,893
2.050% 3/15/31		67,000		48,411
2.400% 3/15/30		195,000		150,539
3.100% 2/15/30		190,000		158,202
3.625% 1/15/28		45,000		40,065
Hudson Pacific Properties LP
3.250% 1/15/30		185,000		125,882
3.950% 11/01/27		85,000		67,097
4.650% 4/01/29		90,000		67,756
5.950% 2/15/28 (c)		260,000		217,056
Invitation Homes Operating Partnership LP
2.000% 8/15/31		405,000		299,717
LXP Industrial Trust
2.375% 10/01/31		430,000		315,136
Physicians Realty LP
2.625% 11/01/31		190,000		143,101
4.300% 3/15/27		45,000		42,295
Prologis Euro Finance LLC
4.250% 1/31/43 EUR (d)		310,000		283,839
Realty Income Corp.
5.125% 7/06/34 EUR (d)		150,000		157,201
Rexford Industrial Realty LP
2.150% 9/01/31		5,000		3,728
VICI Properties LP
4.950% 2/15/30		10,000		9,150
5.125% 5/15/32		482,000		431,425
5.625% 5/15/52		109,000		90,262
VICI Properties LP/VICI Note Co., Inc.
3.750% 2/15/27 (b)		10,000		9,074
3.875% 2/15/29 (b)		160,000		138,258
4.125% 8/15/30 (b)		69,000		58,676
4.500% 9/01/26 (b)		100,000		93,946
4.500% 1/15/28 (b)		58,000		52,930
4.625% 6/15/25 (b)		25,000		24,142
5.750% 2/01/27 (b)		40,000		38,723
				6,365,907
Retail — 0.1%
Fertitta Entertainment LLC/Fertitta Entertainment Finance Co., Inc.
6.750% 1/15/30 (b) (c)		82,000		66,838
Michaels Cos., Inc.
5.250% 5/01/28 (b) (c)		170,000		135,677
				202,515
Savings & Loans — 0.1%
Nationwide Building Society Secured Overnight Financing Rate + 1.290%
2.972% VRN 2/16/28 (b)		340,000		304,082

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

	Principal Amount		Value
Semiconductors — 0.1%
Broadcom, Inc.
2.600% 2/15/33 (b)	$	176,000	$	131,240
3.419% 4/15/33 (b)		208,000		166,370
				297,610
Software — 0.6%
Fiserv, Inc.
5.600% 3/02/33		545,000		528,206
5.625% 8/21/33		90,000		87,205
Open Text Corp.
6.900% 12/01/27 (b)		50,000		50,114
Oracle Corp.
2.800% 4/01/27		140,000		127,116
3.950% 3/25/51		1,208,000		828,138
6.500% 4/15/38		210,000		211,571
6.900% 11/09/52		140,000		144,218
				1,976,568
Telecommunications — 0.6%
AT&T, Inc.
4.750% 5/15/46		455,000		359,425
5.250% 3/01/37		270,000		245,188
Frontier Communications Holdings LLC
8.625% 3/15/31 (b)		321,000		302,404
8.750% 5/15/30 (b)		75,000		71,211
Intelsat Jackson Holdings SA, Escrow
8.500% 10/15/24 (b) (e) (f)		171,000		—
9.750% 7/15/25 (b) (e) (f)		585,000		—
Intelsat Jackson Holdings SA
6.500% 3/15/30 (b)		417,000		369,814
Sprint Spectrum Co. LLC/Sprint Spectrum Co. II LLC/Sprint Spectrum Co. III LLC
4.738% 9/20/29 (b)		260,625		257,860
T-Mobile USA, Inc.
3.750% 4/15/27		375,000		350,407
				1,956,309
Water — 0.0%
Thames Water Utilities Finance PLC
4.375% 1/18/31 EUR (b) (d)		160,000		149,414
TOTAL CORPORATE DEBT (Cost $92,475,939)				81,857,902
MUNICIPAL OBLIGATIONS — 0.8%
California State University, Revenue Bond, Revenue Bond
2.374% 11/01/35		5,000		3,619
City of New York NY, General Obligation
5.968% 3/01/36		500,000		516,075
Jersey City Municipal Utilities Authority, Revenue Bond
5.470% 5/15/27		520,000		522,110
New York City Transitional Finance Authority Future Tax Secured Revenue
Revenue Bond, 2.450% 11/01/34		560,000		414,877
Revenue Bond, 5.508% 8/01/37		45,000		44,208

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

	Principal Amount		Value
New York State Dormitory Authority, Revenue Bond
5.289% 3/15/33	$	750,000	$	738,107
University of California, Revenue Bond
2.247% 5/15/34		290,000		214,740
				2,453,736
TOTAL MUNICIPAL OBLIGATIONS (Cost $2,850,191)				2,453,736
NON-U.S. GOVERNMENT AGENCY OBLIGATIONS — 18.1%
Commercial Mortgage-Backed Securities — 4.0%
BAMLL Commercial Mortgage Securities Trust, Series 2018-PARK, Class A,
4.227% VRN 8/10/38 (b) (g)		620,000		542,878
BX Commercial Mortgage Trust
Series 2020-VIV4, Class A, 2.843% 3/09/44 (b)		1,160,000		942,554
Series 2020-VIVA, Class D, 3.667% VRN 3/11/44 (b) (g)		780,000		615,755
Series 2019-XL, Class A, 1 mo. USD Term SOFR + 1.034% 6.367% FRN 10/15/36 (b)		977,903		975,153
Series 2022-CSMO, Class A, 1 mo. USD Term SOFR + 2.115% 7.447% FRN 6/15/27 (b)		692,000		692,432
BX Trust
Series 2019-OC11, Class A, 3.202% 12/09/41 (b)		180,000		151,443
Series 2019-OC11, Class E, 4.076% VRN 12/09/41 (b) (g)		300,000		239,091
Series 2022-VAMF, Class C, 1 mo. USD Term SOFR + 1.580% 6.912% FRN 1/15/39 (b)		443,000		431,923
BXSC Commercial Mortgage Trust, Series 2022-WSS, Class D, 1 mo. USD Term SOFR + 3.188%
8.521% FRN 3/15/35 (b)		894,000		882,263
Century Plaza Towers, Series 2019-CPT, Class A
2.865% 11/13/39 (b)		355,000		282,253
Credit Suisse Mortgage Capital Certificates, Series 2019-ICE4, Class F, 1 mo. USD Term SOFR + 2.697%
8.030% FRN 5/15/36 (b)		897,766		884,637
DC Office Trust, Series 2019-MTC, Class A
2.965% 9/15/45 (b)		375,000		294,524
Grace Trust, Series 2020-GRCE, Class A
2.347% 12/10/40 (b)		900,000		685,960
GS Mortgage Securities Corp. Trust, Series 2021-ARDN, Class A, 1 mo. USD Term SOFR + 1.364%
6.697% FRN 11/15/36 (b)		1,570,000		1,533,844
Hudson Yards Mortgage Trust
Series 2019-55HY, Class A, 3.041% VRN 12/10/41 (b) (g)		375,000		308,822
Series 2019-30HY, Class A, 3.228% 7/10/39 (b)		385,000		325,378
JP Morgan Chase Commercial Mortgage Securities Trust, Series 2019-OSB, Class A
3.397% 6/05/39 (b)		385,000		326,225
MKT Mortgage Trust, Series 2020-525M, Class A
2.694% 2/12/40 (b)		255,000		183,683
One Bryant Park Trust, Series 2019-OBP, Class A
2.516% 9/15/54 (b)		490,000		389,284
RBS Commercial Funding, Inc. Trust, Series 2013-GSP, Class A,
3.961% VRN 1/15/32 (b) (g)		670,000		659,792
SFAVE Commercial Mortgage Securities Trust, Series 2015-5AVE, Class A1,
3.872% VRN 1/05/43 (b) (g)		655,000		432,451
SMRT Commercial Mortgage Trust, Series 2022-MINI, Class F, 1 mo. USD Term SOFR + 3.350%
8.683% FRN 1/15/39 (b)		630,000		582,032

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

	Principal Amount		Value
Wells Fargo Commercial Mortgage Trust, Series 2019-JWDR, Class E,
3.989% VRN 9/15/31 (b) (g)	$	281,000	$	251,065
				12,613,442
Home Equity Asset-Backed Securities — 0.5%
Aegis Asset-Backed Securities Trust Mortgage Pass-Through Certificates, Series 2005-4, Class M2, 1 mo. USD Term SOFR + 0.819%
6.139% FRN 10/25/35		683,073		611,343
Citigroup Mortgage Loan Trust, Series 2006-HE2, Class M1, 1 mo. USD Term SOFR + 0.549%
5.869% FRN 8/25/36		184,350		183,387
Morgan Stanley Capital I, Inc. Trust, Series 2006-HE1, Class A4, 1 mo. USD Term SOFR + 0.694%
6.014% FRN 1/25/36		820,219		772,853
				1,567,583
Other Asset-Backed Securities — 5.8%
AIMCO CLO, Series 2015-AA, Class BR2, 3 mo. USD Term SOFR + 1.862%
7.170% FRN 10/17/34 (b)		1,100,000		1,078,463
AIMCO CLO Ltd., Series 2020-11A, Class AR, 3 mo. USD Term SOFR + 1.392%
6.700% FRN 10/17/34 (b)		750,000		745,409
Allegro CLO XII Ltd., Series 2020-1A, Class A1, 3 mo. USD Term SOFR + 1.512%
6.845% FRN 1/21/32 (b)		850,000		849,961
Cedar Funding XIV CLO Ltd., Series 2021-14A, Class A, 3 mo. USD Term SOFR + 1.362%
6.670% FRN 7/15/33 (b)		800,000		793,893
Countrywide Asset-Backed Certificates Trust, Series 2004-7, Class MF2,
4.198% VRN 10/25/34 (g)		1,634,150		1,494,197
Dryden XXVI Senior Loan Fund, Series 2013-26A, Class AR, 3 mo. USD Term SOFR + 1.162%
6.470% FRN 4/15/29 (b)		759,775		755,654
Eaton Vance CLO Ltd., Series 2020-1A, Class AR, 3 mo. USD Term SOFR + 1.432%
6.740% FRN 10/15/34 (b)		990,000		978,329
First Franklin Mortgage Loan Trust, Series 2006-FFH1, Class M1, 1 mo. USD Term SOFR + 0.669%
5.989% FRN 1/25/36		712,728		662,485
FirstKey Homes Trust, Series 2020-SFR2, Class E
2.668% 10/19/37 (b)		390,000		356,359
Flatiron CLO Ltd., Series 2021-1A, Class B, 3 mo. USD LIBOR + 1.600%
7.182% FRN 7/19/34 (b)		850,000		836,261
GSAMP Trust, Series 2005-HE5, Class M3, 1 mo. USD Term SOFR + 0.804%
6.124% FRN 11/25/35		272,633		265,571
HPS Loan Management Ltd., Series 2021-16A, Class A1, 3 mo. USD Term SOFR + 1.402%
6.747% FRN 1/23/35 (b)		1,000,000		987,874
JP Morgan Mortgage Acquisition Trust,
4.275% STEP 3/25/47		2,647,691		1,665,775
Long Beach Mortgage Loan Trust, Series 2006-9, Class 2A2, 1 mo. USD Term SOFR + 0.334%
5.654% FRN 10/25/36		5,911,041		1,728,389
Magnetite VII Ltd., Series 2012-7A, Class A1R2, 3 mo. USD Term SOFR + 1.062%
6.370% FRN 1/15/28 (b)		637,731		635,069

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

	Principal Amount		Value
Progress Residential Trust
Series 2020-SFR3, Class E, 2.296% 10/17/27 (b)	$	590,000	$	535,131
Series 2020-SFR3, Class F, 2.796% 10/17/27 (b)		360,000		329,209
Series 2021-SFR2, Class F, 3.395% 4/19/38 (b)		1,150,000		1,010,891
Series 2021-SFR10, Class F, 4.608% 12/17/40 (b)		476,677		403,516
Rockford Tower CLO Ltd., Series 2021-1A, Class A1, 3 mo. USD Term SOFR + 1.432%
6.758% FRN 7/20/34 (b)		850,000		839,011
Saxon Asset Securities Trust, Series 2007-2, Class A2C, 1 mo. USD Term SOFR + 0.354%
5.674% FRN 5/25/47		1,486,490		972,325
Vantage Data Centers Issuer LLC, Series 2020-1A, Class A2
1.645% 9/15/45 (b)		444,000		399,816
				18,323,588
Student Loans Asset-Backed Securities — 1.7%
Access Group, Inc., Series 2015-1, Class A, 1 mo. USD LIBOR + 0.700%
6.134% FRN 7/25/56 (b)		288,467		276,303
Collegiate Funding Services Education Loan Trust, Series 2005-A, Class A4, 3 mo. USD LIBOR + 0.200%
5.720% FRN 3/28/35		947,258		897,232
Nelnet Student Loan Trust, Series 2015-1A, Class A, 30 day USD SOFR Average + 0.704%
6.019% FRN 4/25/46 (b)		527,501		518,481
SLM Student Loan Trust
Series 2007-7, Class A4, 90 day USD SOFR Average + 0.592% 5.646% FRN 1/25/22		458,040		446,384
Series 2012-7, Class A3, 30 day USD SOFR Average + 0.764% 6.079% FRN 5/26/26		549,725		528,021
Series 2012-2, Class A, 30 day USD SOFR Average + 0.814% 6.129% FRN 1/25/29		635,885		612,348
Series 2012-1, Class A3, 30 day USD SOFR Average + 1.064% 6.379% FRN 9/25/28		532,918		519,453
Series 2008-6, Class A4, 90 day USD SOFR Average + 1.362% 6.416% FRN 7/25/23		724,342		719,148
Series 2008-5, Class B, 90 day USD SOFR Average + 2.112% 7.166% FRN 7/25/73		700,000		680,047
				5,197,417
Whole Loan Collateral Collateralized Mortgage Obligations — 6.1%
American Home Mortgage Investment Trust, Series 2005-1, Class 6A, 6 mo. USD SOFR + 2.428%
7.886% FRN 6/25/45		219,102		212,195
Angel Oak Mortgage Trust
Series 2021-7, Class A1, 1.978% VRN 10/25/66 (b) (g)		206,113		168,119
Series 2022-6,Class A1, 4.300% STEP 7/25/67 (b)		820,505		761,106
Chase Mortgage Finance Trust, Series 2007-A1, Class 11A4,
4.099% VRN 3/25/37 (g)		203,979		179,436
Citigroup Mortgage Loan Trust, Series 2005-11, Class A2A, 1 yr. CMT + 2.400%
7.780% FRN 10/25/35		151,387		146,781
COLT Mortgage Loan Trust, Series 2021-6, Class A1,
1.907% VRN 12/25/66 (b) (g)		708,407		586,214
Countrywide Alternative Loan Trust
Series 2006-OA6, Class 1A2, 1 mo. USD Term SOFR + 0.534% 5.854% FRN 7/25/46		763,597		662,675

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

	Principal Amount		Value
Series 2005-31, Class 2A1, 1 mo. USD Term SOFR + 0.714% 6.034% FRN 8/25/35	$	748,673	$	670,218
Credit Suisse Mortgage Trust, Series 2018-RPL9, Class A,
3.850% VRN 9/25/57 (b) (g)		738,240		680,354
Deephaven Residential Mortgage Trust, Series 2021-4, Class A1,
1.931% VRN 11/25/66 (b) (g)		1,393,534		1,157,647
Deutsche Alt-A Securities, Inc. Mortgage Loan Trust, Series 2005-1, Class 1A3, 1 mo. USD Term SOFR + 0.614%
5.934% FRN 2/25/35		1,226,898		1,162,607
First Horizon Mortgage Pass-Through Trust, Series 2005-AR5, Class 2A1,
4.302% VRN 11/25/35 (g)		197,635		155,694
GS Mortgage-Backed Securities Corp. Trust, Series 2021-RPL1, Class A1,
1.750% VRN 12/25/60 (b) (g)		1,513,453		1,349,831
GS Mortgage-Backed Securities Trust
Series 2022-PJ6 , Class A4, 3.000% VRN 1/25/53 (b) (g)		1,900,630		1,495,484
Series 2018-RPL1, Class A1A, 3.750% 10/25/57 (b)		579,766		548,955
HarborView Mortgage Loan Trust, Series 2006-10, Class 1A1A, 1 mo. USD Term SOFR + 0.314%
5.642% FRN 11/19/36		1,550,675		1,100,973
Impac CMB Trust, Series 2005-1, Class 1A1, 1 mo. USD Term SOFR + 0.634%
5.954% FRN 4/25/35		367,463		338,820
IndyMac Index Mortgage Loan Trust
Series 2005-AR19, Class A1, 3.498% VRN 10/25/35 (g)		619,427		451,808
Series 2006-AR27, Class 1A3, 1 mo. USD Term SOFR + 0.654% 5.974% FRN 10/25/36		1,208,020		508,284
JP Morgan Mortgage Trust, Series 2021-13, Class A3,
2.500% VRN 4/25/52 (b) (g)		1,626,308		1,227,291
MASTR Adjustable Rate Mortgages Trust, Series 2007-1, Class I2A3, 1 yr. MTA + 0.740%
5.366% FRN 1/25/47		409,121		399,873
Nomura Asset Acceptance Corp. Alternative Loan Trust, Series 2005-AR1, Class M1, 1 mo. USD Term SOFR + 1.184%
6.504% FRN 2/25/35		478,626		459,518
Opteum Mortgage Acceptance Corp. Asset-Backed Pass-Through Certificates, Series 2005-4 , Class M2, 1 mo. USD Term SOFR + 0.864%
6.184% FRN 11/25/35		1,450,000		1,360,337
Structured Asset Mortgage Investments II Trust, Series 2006-AR8, Class A2, 1 mo. USD Term SOFR + 0.534%
5.854% FRN 10/25/36		1,568,508		1,288,189
Washington Mutual Mortgage Pass-Through Certificates Trust
Series 2006-1 Class 3A2, 5.750% 2/25/36		421,383		364,096
Series 2005-AR15, Class A1A1, 1 mo. USD Term SOFR + 0.634% 5.954% FRN 11/25/45		1,547,414		1,385,783
Series 2005-AR13, Class A1A1, 1 mo. USD Term SOFR + 0.694% 6.014% FRN 10/25/45		290,117		264,534
Series 2005-AR2, Class 2A21, 1 mo. USD Term SOFR + 0.774% 6.094% FRN 1/25/45		237,676		228,403
				19,315,225
TOTAL NON-U.S. GOVERNMENT AGENCY OBLIGATIONS (Cost $60,722,127)				57,017,255
SOVEREIGN DEBT OBLIGATIONS — 0.8%
Brazilian Government International Bond
3.875% 6/12/30 (c)		200,000		174,070
Chile Government International Bond
2.550% 1/27/32 (c)		224,000		180,876

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

	Principal Amount		Value
Colombia Government International Bond
4.500% 3/15/29	$	200,000	$	173,563
Dominican Republic International Bond
4.500% 1/30/30 (b)		200,000		169,239
Hungary Government International Bond
2.125% 9/22/31 (b)		200,000		147,226
Mexico Government International Bond
4.875% 5/19/33 (c)		300,000		268,818
Panama Government International Bond
2.252% 9/29/32		200,000		144,552
3.160% 1/23/30		200,000		167,892
Paraguay Government International Bond
4.950% 4/28/31 (b)		200,000		184,436
Perusahaan Penerbit SBSN Indonesia III
2.550% 6/09/31 (b)		200,000		162,756
Peruvian Government International Bond
2.783% 1/23/31		200,000		163,418
Poland Government International Bond
4.875% 10/04/33		100,000		93,000
5.750% 11/16/32		17,000		17,018
Romania Government International Bond
3.000% 2/14/31 (b)		110,000		88,394
South Africa Government International Bond
5.875% 4/20/32		250,000		212,500
				2,347,758
TOTAL SOVEREIGN DEBT OBLIGATIONS (Cost $2,709,179)				2,347,758
U.S. Government Agency Obligations and Instrumentalities (h) — 36.2%
Collateralized Mortgage Obligations — 0.7%
Federal Home Loan Mortgage Corp. REMICS
Series 4818, Class CA, 3.000% 4/15/48		137,395		117,513
Series 4639, Class HZ, 3.250% STEP 4/15/53		1,653,331		1,205,839
Series 4846, Class PA, 4.000% 6/15/47		47,426		46,288
Federal National Mortgage Association REMICS
Series 2018-43, Class CT, 3.000% 6/25/48		244,316		208,664
Series 2018-57, Class QA, 3.500% 5/25/46		57,916		56,481
Series 2018-55, Class PA, 3.500% 1/25/47		66,228		63,220
Government National Mortgage Association REMICS
Series 2018-124, Class NW, 3.500% 9/20/48		243,028		214,690
Series 2019-15, Class GT, 3.500% 2/20/49		147,365		130,038
				2,042,733
Pass-Through Securities — 35.2%
Federal Home Loan Mortgage Corp.
Pool #QE0312 2.000% 4/01/52		1,166,076		887,334
Pool #SD8194 2.500% 2/01/52		1,556,707		1,237,328
Pool #RA6815 2.500% 2/01/52		2,125,712		1,700,223
Pool #SD8205 2.500% 4/01/52		1,682,309		1,336,110
Pool #SD8212 2.500% 5/01/52		1,635,775		1,299,152
Pool #G18592 3.000% 3/01/31		142,971		134,516
Pool #G18627 3.000% 1/01/32		469,895		440,273
Pool #G08710 3.000% 6/01/46		92,690		78,496
Pool #ZM1779 3.000% 9/01/46		471,243		397,926
Pool #G08726 3.000% 10/01/46		695,713		588,304

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

	Principal Amount		Value
Pool #G08732 3.000% 11/01/46	$	253,689	$	214,523
Pool #G08741 3.000% 1/01/47		702,146		593,744
Pool #QD8259 3.000% 3/01/52		1,835,149		1,519,523
Pool #G07848 3.500% 4/01/44		1,116,643		994,222
Pool #G60023 3.500% 4/01/45		1,019,419		902,493
Pool #G08711 3.500% 6/01/46		303,114		266,642
Pool #G08716 3.500% 8/01/46		424,193		373,153
Pool #G67700 3.500% 8/01/46		510,814		450,628
Pool #G08722 3.500% 9/01/46		75,058		66,027
Pool #G08742 3.500% 1/01/47		346,359		303,709
Pool #G08757 3.500% 4/01/47		88,618		77,567
Pool #ZA5103 3.500% 12/01/47		3,373		2,947
Pool #G67707 3.500% 1/01/48		1,852,478		1,636,528
Pool #G08800 3.500% 2/01/48		30,809		26,948
Pool #G08816 3.500% 6/01/48		250,130		218,705
Pool #G61556 3.500% 8/01/48		437,655		384,311
Pool #G60344 4.000% 12/01/45		547,526		498,804
Pool #G67711 4.000% 3/01/48		597,681		544,123
Pool #G67713 4.000% 6/01/48		2,498		2,272
Pool #RA7921 4.000% 9/01/52 (i)		1,691,876		1,509,334
Pool #G08843 4.500% 10/01/48		114,777		107,310
Pool #SD2730 4.500% 4/01/53 (i)		1,554,085		1,428,008
Pool #G08833 5.000% 7/01/48		75,302		72,498
Pool #G08844 5.000% 10/01/48		67,234		64,688
Federal National Mortgage Association
Pool #MA4152 2.000% 10/01/40		762,158		617,125
Pool #MA4176 2.000% 11/01/40		1,479,243		1,192,669
Pool #MA4333 2.000% 5/01/41		180,550		144,951
Pool #MA4158 2.000% 10/01/50		991,797		760,604
Pool #BQ6913 2.000% 12/01/51		2,208,185		1,683,785
Pool #MA4492 2.000% 12/01/51		1,692,230		1,288,772
Pool #BQ7006 2.000% 1/01/52		3,473,528		2,645,377
Pool #CB2802 2.000% 2/01/52		1,139,760		867,665
Pool #FS1598 2.000% 4/01/52		1,583,236		1,205,270
Pool #BL6060 2.455% 4/01/40		570,000		371,251
Pool #MA4512 2.500% 1/01/52		1,652,933		1,313,812
Pool #MA4548 2.500% 2/01/52		1,579,781		1,255,668
Pool #MA4563 2.500% 3/01/52		1,614,187		1,282,007
Pool #MA1607 3.000% 10/01/33		257,541		232,763
Pool #MA3811 3.000% 10/01/49		203,248		166,799
Pool #CB2430 3.000% 12/01/51 (i)		2,776,339		2,296,669
Pool #BV8477 3.000% 5/01/52		573,218		474,407
Pool #AB4262 3.500% 1/01/32		220,282		206,725
Pool #MA1512 3.500% 7/01/33		111,334		103,264
Pool #MA1148 3.500% 8/01/42		631,506		564,204
Pool #CA0996 3.500% 1/01/48		120,935		106,047
Pool #MA3305 3.500% 3/01/48		23,639		20,648
Pool #BL1132 3.730% 1/01/29		920,000		851,894
Pool #MA1146 4.000% 8/01/42		260,385		240,628
Pool #AS9830 4.000% 6/01/47		117,658		106,526
Pool #MA3027 4.000% 6/01/47		179,314		162,349
Pool #AS9972 4.000% 7/01/47		108,893		98,590
Pool #931504 4.500% 7/01/39		37,170		35,654
Pool #CA1710 4.500% 5/01/48		406,325		379,488
Pool #CA1711 4.500% 5/01/48		131,339		122,664
Pool #CA2208 4.500% 8/01/48		227,459		212,364
Pool #BW9897 4.500% 10/01/52		731,707		672,300
Pool #AD6374 5.000% 5/01/40		7,853		7,735

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

	Principal Amount		Value
Pool #AI2733 5.000% 5/01/41	$	81,861	$	80,447
Pool #977014 5.500% 5/01/38		8,439		8,468
Pool #985524 5.500% 6/01/38		12,576		12,635
Pool #988578 5.500% 8/01/38		90,134		90,492
Pool #995482 5.500% 1/01/39		51,749		51,962
Government National Mortgage Association II
Pool #MA4126 3.000% 12/20/46		547,986		470,623
Pool #MA4718 3.000% 9/20/47		59,392		50,952
Pool #MA4836 3.000% 11/20/47		209,119		179,335
Pool #MA6209 3.000% 10/20/49		176,980		146,077
Pool #MA3521 3.500% 3/20/46		212,916		189,477
Pool #MA3597 3.500% 4/20/46		66,022		58,733
Pool #MA3663 3.500% 5/20/46		96,908		86,210
Pool #MA3937 3.500% 9/20/46		79,567		70,783
Pool #MA4127 3.500% 12/20/46		291,201		258,871
Pool #MA4262 3.500% 2/20/47		294,330		261,377
Pool #MA4382 3.500% 4/20/47		75,328		66,894
Pool #MA4719 3.500% 9/20/47		92,836		82,413
Pool #MA4837 3.500% 11/20/47		192,140		170,568
Pool #MA4900 3.500% 12/20/47		692,672		614,687
Pool #MA4653 4.000% 8/20/47		36,720		33,617
Pool #MA4838 4.000% 11/20/47		153,484		140,514
Pool #MA4901 4.000% 12/20/47		67,037		61,309
Pool #MA5078 4.000% 3/20/48		226,774		207,257
Pool #MA5466 4.000% 9/20/48		253,101		231,159
Pool #MA5399 4.500% 8/20/48		459,354		430,674
Pool #MA3666 5.000% 5/20/46		77,807		76,041
Pool #MA4199 5.000% 1/20/47		79,282		77,477
Pool #MA4454 5.000% 5/20/47		123,261		119,871
Pool #MA4722 5.000% 9/20/47		138,828		134,923
Government National Mortgage Association II, TBA
2.500% 10/20/53 (i)		5,225,000		4,269,566
4.500% 10/20/53 (i)		1,575,000		1,454,771
5.000% 10/20/53 (i)		800,000		758,310
5.500% 10/20/53 (i)		2,450,000		2,377,734
Uniform Mortgage-Backed Security, TBA
2.000% 10/01/53 (i)		9,700,000		7,373,460
2.500% 10/01/52 (i)		4,050,000		3,212,312
3.000% 10/01/53 (i)		6,675,000		5,518,611
3.500% 10/01/53 (i)		2,500,000		2,149,609
4.000% 10/01/53 (i)		8,325,000		7,414,450
4.500% 10/01/52 (i)		6,750,000		6,198,659
5.000% 10/01/53 (i)		14,325,000		13,517,548
5.500% 10/01/53 (i)		10,300,000		9,955,599
				110,713,518
Whole Loans — 0.3%
Federal National Mortgage Association Connecticut Avenue Securities, Series 2022-R03, Class 1M2, 30 day USD SOFR Average + 3.500%
8.815% FRN 3/25/42 (b)		1,000,000		1,035,615
TOTAL U.S. GOVERNMENT AGENCY OBLIGATIONS AND INSTRUMENTALITIES (Cost $122,781,114)				113,791,866
U.S. TREASURY OBLIGATIONS — 29.8%
U.S. Treasury Bonds & Notes — 29.8%
U.S. Treasury Bonds
3.875% 5/15/43		925,000		803,885

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

	Principal Amount		Value
4.125% 8/15/53 (i)	$	14,365,000	$	13,036,577
4.375% 8/15/43 (c)		19,450,000		18,143,771
U.S. Treasury Inflation-Indexed Notes
1.250% 4/15/28		2,171,659		2,064,625
1.375% 7/15/33		2,482,961		2,295,624
U.S. Treasury Notes
3.875% 8/15/33		3,820,000		3,608,714
4.375% 8/31/28		7,175,000		7,103,363
4.625% 9/15/26		11,690,000		11,632,661
4.625% 9/30/28 (i)		30,175,000		30,193,708
5.000% 9/30/25 (i)		4,885,000		4,880,525
				93,763,453
TOTAL U.S. TREASURY OBLIGATIONS (Cost $96,035,642)				93,763,453
TOTAL BONDS & NOTES (Cost $383,483,200)				357,104,748
	Number of Shares
EQUITIES — 0.1%
COMMON STOCK — 0.1%
Communications — 0.1%
Telecommunications — 0.1%
Intelsat SA (j)		7,225		154,254
TOTAL COMMON STOCK (Cost $676,994)				154,254
TOTAL EQUITIES (Cost $676,994)				154,254
RIGHTS — 0.0%
Communications — 0.0%
Telecommunications — 0.0%
Intelsat Jackson Holdings SA (e) (f) (j)		756		—
Intelsat Jackson Holdings SA (e) (f) (j)		756		—
				—
TOTAL RIGHTS (Cost $0)				—
TOTAL LONG-TERM INVESTMENTS (Cost $384,160,194)				357,259,002
SHORT-TERM INVESTMENTS — 26.6%
Investment of Cash Collateral from Securities Loaned — 8.9%
State Street Navigator Securities Lending Government Money Market Portfolio (k)		28,051,718		28,051,718

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

	Principal Amount		Value
Repurchase Agreement — 12.3%
Fixed Income Clearing Corp., Repurchase Agreement, dated 9/29/23, 1.600%, due 10/02/23 (l)	$	38,570,974	$	38,570,974
U.S. Treasury Bill — 5.4%
U.S. Treasury Bills
5.380% 12/21/23 (m)		4,575,000		4,520,979
5.438% 11/21/23 (m)		4,945,000		4,908,515
5.458% 11/28/23 (c) (m)		3,305,000		3,277,122
5.458% 11/28/23 (m)		4,250,000		4,214,150
				16,920,766
TOTAL SHORT-TERM INVESTMENTS (Cost $83,540,633)				83,543,458
TOTAL INVESTMENTS — 140.3% (Cost $467,700,827) (n)				440,802,460
Other Assets/(Liabilities) — (40.3)%				(126,525,190)
NET ASSETS — 100.0%			$	314,277,270

Abbreviation Legend

CLO Collateralized Loan Obligation

FRN Floating Rate Note

REMICS Real Estate Mortgage Investment Conduits

STEP Step Up Bond

TBA To Be Announced

VRN Variable Rate Note

Notes to Portfolio of Investments

Percentages are stated as a percent of net assets.

(a) All or a portion of the security represents unsettled bank loan commitments at September 30, 2023 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 September 30, 2023, the aggregate market value of these securities amounted to $59,990,532 or 19.09% of net assets.

(c) Denotes all or a portion of security on loan. The total value of securities on loan as of September 30, 2023, was $27,749,318 or 8.83% of net assets. The Fund received $279,754 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).

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

(e) This security is fair valued in good faith in accordance with procedures approved by the Board of Trustees. At September 30, 2023, these securities amounted to a value of $0 or 0.00% of net assets.

(f) Investment is valued using significant unobservable inputs.

(g) 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 September 30, 2023.

(h) 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.

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

(j) Non-income producing security.

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

(l) Maturity value of $38,576,116. Collateralized by U.S. Government Agency obligations with a rate of 0.375%, maturity date of 1/31/26, and an aggregate market value, including accrued interest, of $39,342,442.

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

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

Forward contracts
Counterparty	Settlement Date	Currency Purchased		Currency Sold		Unrealized Appreciation (Depreciation)
Citibank N.A.	10/13/23	USD	2,850,512	EUR	2,614,000	$	85,734
Citibank N.A.	10/13/23	USD	310,503	GBP	242,000		15,222
						$	100,956

Futures contracts
	Expiration Date	Number of Contracts		Notional Amount		Value/ Net Unrealized Appreciation (Depreciation)
Long
U.S. Treasury Ultra 10 Year	12/19/23		6	$	690,549	$	(21,174)
U.S. Treasury Ultra Bond	12/19/23		1		125,198		(6,510)
U.S. Treasury Note 2 Year	12/29/23		541		110,048,344		(381,727)
U.S. Treasury Note 5 Year	12/29/23		3		318,225		(2,147)
						$	(411,558)
Short
Euro-BOBL	12/07/23		4	$	(494,508)	$	5,001
Euro-Bund	12/07/23		4		(560,803)		16,784
Euro-Buxl 30 Year Bond	12/07/23		2		(282,410)		23,680
						$	45,465

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

$

176,249

$

—

$

176,249

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.

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. 

Notes to Portfolio of Investments (Unaudited) (Continued)

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 one or a combination of, but not limited to, the following inputs:

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

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

Notes to Portfolio of Investments (Unaudited) (Continued)

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

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

Notes to Portfolio of Investments (Unaudited) (Continued)

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

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

The Allocation Funds, Feeder Fund, and MML American Funds Core Allocation Fund characterized all investments at Level 1, as of September 30, 2023. The Focused Equity Fund, Fundamental Equity Fund, Large Cap Growth 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 September 30, 2023. 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 September 30, 2023, for the remaining Funds' investments:

Blue Chip Growth Fund
Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock	$	405,863,004	$	644,170	$	742,427	$	407,249,601
Preferred Stock		—		—		911,759		911,759
Corporate Debt		—		726,034		—		726,034
Short-Term Investments		105		1,385,995		—		1,386,100
Total Investments	$	405,863,109	$	2,756,199	$	1,654,186	$	410,273,494

Equity Income Fund
Asset Investments
Common Stock*	$	310,902,191	$	14,023,906	$	—	$	324,926,097
Preferred Stock*		804,812		2,297,307		—		3,102,119
Short-Term Investments		4,094,141		2,491,817		—		6,585,958
Total Investments	$	315,801,144	$	18,813,030	$	—	$	334,614,174

Notes to Portfolio of Investments (Unaudited) (Continued)

Equity Index Fund
Asset Investments	Level 1			Level 2		Level 3		Total
Common Stock	$	581,401,337		$	—	$	—	$	581,401,337
Short-Term Investments		—			9,227,489		—		9,227,489
Total Investments	$	581,401,337		$	9,227,489	$	—	$	590,628,826
Liability Derivatives
Futures Contracts	$	(418,426	)	$	—	$	—	$	(418,426	)

Foreign Fund
Asset Investments
Common Stock*
Australia	$	—	$	7,955,445	$	—	$	7,955,445
Belgium		—		5,899,620		—		5,899,620
Canada		1,162,295		—		—		1,162,295
China		1,639,344		—		—		1,639,344
Denmark		—		654,954		—		654,954
Finland		—		1,790,953		—		1,790,953
France		—		15,227,672		—		15,227,672
Germany		—		18,639,860		—		18,639,860
Hong Kong		—		1,484,325		—		1,484,325
Ireland		2,444,130		4,054,992		—		6,499,122
Israel		1,839,264		—		—		1,839,264
Italy		—		617,842		—		617,842
Japan		—		29,739,873		—		29,739,873
Luxembourg		—		1,440,569		—		1,440,569
Netherlands		—		7,566,743		—		7,566,743
Norway		—		2,182,046		—		2,182,046
Republic of Korea		—		3,075,363		—		3,075,363
Singapore		—		2,470,182		—		2,470,182
Sweden		—		3,502,543		—		3,502,543
Switzerland		—		6,378,039		—		6,378,039
United Kingdom		690,432		31,089,904		—		31,780,336
United States		1,750,045		11,640,875		—		13,390,920
Preferred Stock*
Germany		—		934,978		—		934,978
Short-Term Investments		1,107,831		—		—		1,107,831
Total Investments	$	10,633,341	$	156,346,778	$	—	$	166,980,119

Fundamental Value Fund
Asset Investments
Common Stock	$	157,535,922	$	—	$	—	$	157,535,922
Short-Term Investments		337,413		2,039,734		—		2,377,147
Total Investments	$	157,873,335	$	2,039,734	$	—	$	159,913,069

Global Fund
Asset Investments
Common Stock *
Austria	$	—	$	648,931	$	—	$	648,931
Canada		4,309,781		—		—		4,309,781
Denmark		—		598,049		—		598,049
France		—		9,698,601		—		9,698,601
Germany		—		4,726,050		—		4,726,050
Israel		1,514,461		—		—		1,514,461
Japan		—		3,074,578		—		3,074,578
Mexico		390,741		—		—		390,741
Netherlands		—		2,759,207		—		2,759,207
Republic of Korea		—		1,357,466		—		1,357,466
Spain		—		1,714,073		—		1,714,073
Sweden		—		1,342,497		—		1,342,497
Switzerland		—		5,615,304		—		5,615,304
United Kingdom		—		9,472,560		—		9,472,560
United States		63,829,476		9,655,400		—		73,484,876
Warrants		78,339		—		—		78,339
Short-Term Investments		4,355,306		801,340		—		5,156,646
Total Investments	$	74,478,104	$	51,464,056	$	—	$	125,942,160

Notes to Portfolio of Investments (Unaudited) (Continued)

Income & Growth Fund
Asset Investments	Level 1		Level 2		Level 3		Total
Common Stock	$	152,999,270	$	—	$	—	$	152,999,270
Short-Term Investments		96,520		318,898		—		415,418
Total Investments	$	153,095,790	$	318,898	$	—	$	153,414,688

International Equity Fund
Asset Investments
Common Stock*
Australia	$	—	$	2,754,807	$	—	$	2,754,807
Belgium		—		2,137,881		—		2,137,881
Canada		7,432,586		—		—		7,432,586
China		1,275,548		5,338,057		—		6,613,605
Denmark		—		5,244,715		—		5,244,715
France		—		36,227,395		—		36,227,395
Germany		—		34,129,222		—		34,129,222
Hong Kong		—		5,467,744		—		5,467,744
India		1,974,416		715,504		—		2,689,920
Indonesia		—		114,225		—		114,225
Ireland		3,254,688		—		—		3,254,688
Israel		2,056,111		—		—		2,056,111
Italy		—		6,217,567		—		6,217,567
Japan		—		24,073,519		—		24,073,519
Luxembourg		—		952,864		—		952,864
Netherlands		—		5,238,014		—		5,238,014
Portugal		—		1,384,320		—		1,384,320
Republic of Korea		—		2,620,094		—		2,620,094
Singapore		—		1,912,795		—		1,912,795
Spain		—		2,520,288		—		2,520,288
Sweden		—		3,020,306		—		3,020,306
Switzerland		—		16,771,831		—		16,771,831
Taiwan		1,797,613		—		—		1,797,613
United Kingdom		741,296		23,982,132		—		24,723,428
United States		2,283,250		18,772,942		—		21,056,192
Preferred Stock*
Republic of Korea		—		1,247,515		—		1,247,515
Short-Term Investments		2,040,796		8,433,935		—		10,474,731
Total Investments	$	22,856,304	$	209,277,672	$	—	$	232,133,976

Managed Volatility Fund
Asset Investments
Common Stock	$	97,098,492		$	—	$	—		$	97,098,492
Corporate Debt		—			—		—	+		—
Purchased Options		1,350,944			—		—			1,350,944
Rights		—			—		—	+		—
Short-Term Investments		—			1,612,661		—			1,612,661
Total Investments	$	98,449,436		$	1,612,661	$	—		$	100,062,097
Liability Derivatives
Written Options	$	(616,180	)	$	—	$	—		$	(616,180	)

Mid Cap Growth Fund
Asset Investments
Common Stock	$	305,949,720	$	153,319	$	—	$	306,103,039
Preferred Stock		—		—		813,920		813,920
Short-Term Investments		630,089		7,594,441		—		8,224,530
Total Investments	$	306,579,809	$	7,747,760	$	813,920	$	315,141,489

Mid Cap Value Fund
Asset Investments
Common Stock	$	222,128,310	$	19,284,409	*	$	—	$	241,412,719
Preferred Stock		—		1,818,211	*		—		1,818,211
Mutual Funds		5,040,144		—			—		5,040,144
Short-Term Investments		341,972		5,104,418			—		5,446,390
Total Investments	$	227,510,426	$	26,207,038		$	—	$	253,717,464
Asset Derivatives
Forward Contracts	$	—	$	39,435		$	—	$	39,435
Liability Derivatives
Forward Contracts	$	—	$	(285	)	$	—	$	(285	)

Small Cap Growth Equity Fund
Asset Investments
Common Stock	$	135,006,912	$	—	$	—	$	135,006,912
Mutual Funds		733,510		—		—		733,510
Short-Term Investments		1,627,524		147,316		—		1,774,840
Total Investments	$	137,367,946	$	147,316	$	—	$	137,515,262

Notes to Portfolio of Investments (Unaudited) (Continued)

Small Company Value Fund
Asset Investments	Level 1		Level 2			Level 3		Total
Common Stock	$	68,698,360	$	429,851	*	$	—	$	69,128,211
Short-Term Investments		180,997		101,354			—		282,351
Total Investments	$	68,879,357	$	531,205		$	—	$	69,410,562
Liability Derivatives
Forward Contracts	$	—	$	(3,882	)	$	—	$	(3,882	)

Sustainable Equity Fund
Asset Investments
Common Stock	$	128,746,593	$	1,514,420	*	$	—	$	130,261,013
Mutual Funds		425,343		—			—		425,343
Short-Term Investments		—		364,161			—		364,161
Total Investments	$	129,171,936	$	1,878,581		$	—	$	131,050,517
Asset Derivatives
Forward Contracts	$	—	$	954		$	—	$	954

Total Return Bond Fund
Asset Investments
Bank Loans	$	—		$	5,872,778		$	—		$	5,872,778
Corporate Debt		—			81,857,902			—	+		81,857,902
Municipal Obligations		—			2,453,736			—			2,453,736
Non-U.S. Government Agency Obligations		—			57,017,255			—			57,017,255
Sovereign Debt Obligations		—			2,347,758			—			2,347,758
U.S. Government Agency Obligations and Instrumentalities		—			113,791,866			—			113,791,866
U.S. Treasury Obligations		—			93,763,453			—			93,763,453
Common Stock		154,254			—			—			154,254
Rights		—			—			—	+		—
Short-Term Investments		28,051,718			55,491,740			—			83,543,458
Total Investments	$	28,205,972		$	412,596,488		$	—		$	440,802,460
Liability Investments
Unfunded Loan Commitments**	$	—		$	(203	)	$	—		$	(203	)
Asset Derivatives
Forward Contracts	$	—		$	100,956		$	—		$	100,956
Futures Contracts		45,465			—			—			45,465
Swap Agreements		—			176,249			—			176,249
Total	$	45,465		$	277,205		$	—		$	322,670
Liability Derivatives
Futures Contracts	$	(411,558	)	$	—		$	—		$	(411,558	)

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.

** Unfunded bank loan commitments are valued at the unrealized appreciation (depreciation) on the commitment.

+ Represents a security at $0 value as of September 30, 2023.

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 September 30, 2023, 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. 

Notes to Portfolio of Investments (Unaudited) (Continued)

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.

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 September 30, 2023, the aggregate cost of investments and the unrealized appreciation (depreciation) in the value of all investments owned by the Fund(s), as computed on a federal income tax basis, were as follows:

	Federal Income Tax Cost		Tax Basis Unrealized Appreciation		Tax Basis Unrealized (Depreciation)			Net Unrealized Appreciation (Depreciation)
Conservative Allocation Fund	$	321,456,075	$	164,465	$	(53,024,779	)	$	(52,860,314	)
Balanced Allocation Fund		373,681,896		–		(54,527,004	)		(54,527,004	)
Moderate Allocation Fund		1,334,367,840		–		(204,824,956	)		(204,824,956	)
Growth Allocation Fund		1,038,574,695		–		(152,096,340	)		(152,096,340	)
Aggressive Allocation Fund		141,714,960		–		(22,113,102	)		(22,113,102	)
MML American Funds Growth Fund		219,176,993		1,333,317		–			1,333,317
MML American Funds Core Allocation Fund		680,115,321		16,996,965		(52,059,682	)		(35,062,717	)
Blue Chip Growth Fund		302,942,464		126,523,456		(19,192,426	)		107,331,030
Equity Income Fund		288,146,898		63,362,841		(16,895,565	)		46,467,276
Equity Index Fund		332,990,204		279,188,069		(21,549,447	)		257,638,622
Focused Equity Fund		253,213,893		33,874,065		(10,531,171	)		23,342,894
Foreign Fund		170,784,048		18,267,946		(22,071,875	)		(3,803,929	)
Fundamental Equity Fund		129,080,463		14,493,815		(5,432,650	)		9,061,165
Fundamental Value Fund		135,187,289		30,448,460		(5,722,680	)		24,725,780
Global Fund		113,885,876		20,472,889		(8,416,605	)		12,056,284
Income & Growth Fund		135,675,423		26,365,559		(8,626,294	)		17,739,265
International Equity Fund		244,813,287		14,724,000		(27,403,311	)		(12,679,311	)
Large Cap Growth Fund		157,317,805		45,602,233		(14,903,184	)		30,699,049
Managed Volatility Fund		64,497,540		38,700,583		(3,136,026	)		35,564,557
Mid Cap Growth Fund		271,737,257		61,255,980		(17,851,748	)		43,404,232
Mid Cap Value Fund		278,509,099		7,818,259		(32,609,894	)		(24,791,635	)
Small Cap Growth Equity Fund		133,284,157		19,679,433		(15,448,328	)		4,231,105
Small Company Value Fund		78,409,592		3,773,110		(12,772,140	)		(8,999,030	)
Small/Mid Cap Value Fund		132,039,205		9,858,833		(18,438,968	)		(8,580,135	)
Sustainable Equity Fund		108,096,431		30,669,619		(7,715,533	)		22,954,086
Total Return Bond Fund		467,700,827		671,319		(27,569,686	)		(26,898,367	)

Notes to Portfolio of Investments (Unaudited) (Continued)

4. New Accounting Pronouncements

In June 2022, FASB issued Accounting Standards Update 2022-03 — Fair Value Measurement (Topic 820) — Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions ("ASU 2022-03"). ASU 2022-03 clarifies the guidance in Topic 820 to indicate that a contractual sale restriction should not be considered in the fair value of an equity security subject to such a restriction, and requires entities with investments in equity securities subject to contractual sale restrictions to disclose certain qualitative and quantitative information about such securities. ASU 2022-03 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2023, and allows for early adoption. ASU 2022-03 will only be applicable to an equity security in which the contractual arrangement that restricts its sale is executed or modified on or after the adoption date. Management is currently evaluating the impact of applying this update.

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.

Notes to Portfolio of Investments (Unaudited) (Continued)

5. Coronavirus (COVID-19) Pandemic

The global pandemic outbreak of the novel coronavirus known as COVID-19 and efforts to contain its spread have produced, and may continue to produce, substantial market volatility, severe market dislocations and liquidity constraints in many markets, exchange trading suspensions and closures, higher default rates, and global business disruption, and they may result in future significant adverse effects. Such factors, and the effects of other infectious illness outbreaks, epidemics, or pandemics, may have a significant adverse effect on a Fund’s performance and have the potential to impair the ability of a Fund’s investment adviser, subadviser, or other service providers to serve the Fund and could lead to disruptions that negatively impact the Fund.

6. 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.