MFS Total Return Fund

S000002439MFS Series Trust VCIK 0000200489

Share classes

9 classes of this one portfolio · 0 exchange-listed

Class ID	Symbol	Status	Security in the master	Type
C000006555	MSFFX	NOT_LISTED	not exchange-listed	—
C000006558	MSFHX	NOT_LISTED	not exchange-listed	—
C000006547	MSFJX	NOT_LISTED	not exchange-listed	—
C000116934	MSFKX	NOT_LISTED	not exchange-listed	—
C000006546	MSFRX	NOT_LISTED	not exchange-listed	—
C000006551	MTRBX	NOT_LISTED	not exchange-listed	—
C000006552	MTRCX	NOT_LISTED	not exchange-listed	—
C000006553	MTRIX	NOT_LISTED	not exchange-listed	—
C000006557	MTRRX	NOT_LISTED	not exchange-listed	—

The share-class bridge is a snapshot, not history. The SEC's fund share-class file says what each class trades as today, not what it traded as at a past report date. A fund that changed ticker or converted from a mutual fund resolves to its present-day symbol for every historical month shown.

Share classes

Report period

1 period filed. Holdings below describe the selected month only.

2026-03-31

Filing

NPORT-P · filed 2026-05-26

Report date: 2026-03-31
Net assets: $7,465,973,116.85
Total assets: $7,550,019,626.21
Total liabilities: $84,046,509.36
Assets invested: $0
Cash not reported in C or D: $0
Amendment: No
Accession: 0002071691-26-011425

By asset category

N-PORT Item C.4.a

ECEquity - common$4.33B57.7%

DBTDebt$1.78B23.7%

ABS-MBSAsset-backed: mortgage-ba…$872.51M11.6%

ABS-CBDOAsset-backed: collaterali…$346.43M4.6%

By asset category

By issuer category

N-PORT Item C.4.b

CORPCorporate$5.88B78.3%

USTUS Treasury$789.20M10.5%

USGSEUS government sponsored e…$489.37M6.5%

USGAUS government agency$196.86M2.6%

RFRegistered fund$127.59M1.7%

MUNMunicipal$26.89M0.4%

NUSSNon-US sovereign$2.38M0.0%

OTHEROther; the filer describe…-$4.77M-0.1%

By issuer category

By investment country

as filed

USUS$6.00B80.4%

IEIE$479.57M6.4%

KYKY$285.70M3.8%

CHCH$148.00M2.0%

GBGB$143.28M1.9%

JEJE$86.92M1.2%

CACA$77.11M1.0%

NLNL$60.89M0.8%

BMBM$57.87M0.8%

DEDE$52.93M0.7%

JPJP$45.40M0.6%

HKHK$21.83M0.3%

By country

Classification look-through

Positions resolved to the master through ISIN, then rolled up through the taxonomy. 52.1% of reported value reaches a classification.

Not resolved to the master(887)$3.56B47.4%

Equity · Financials(16)$1.07B14.2%

Equity · Health Care(10)$767.29M10.2%

Equity · Information Technology(7)$377.00M5.0%

Equity · Industrials(10)$323.67M4.3%

Equity · Energy(5)$259.96M3.5%

Equity · Communication Services(4)$250.40M3.3%

Equity · Consumer Staples(6)$246.52M3.3%

Equity · Consumer Discretionary(6)$198.28M2.6%

Equity · Utilities(4)$187.53M2.5%

Equity · Materials(4)$139.69M1.9%

Equity(1)$91.95M1.2%

Resolved, not yet classified(1)$37.38M0.5%

Classification covers part of the master. 5,771 of 13,106 active securities are classified. Anything unclassified is shown as its own band rather than dropped, so a look-through total that falls short of 100% is telling you about coverage, not about the fund.

Percentages are of the reported value of positions above ($7.51B), not of the fund’s net assets ($7.47B). The two differ by cash, derivatives filed with no market value, and rounding.

Issuer↕	In master	CUSIP / ISIN	Asset	Balance↕	Value↕	Weight▼	Country
LKQ Corp.	LKQ	501889208 US5018892084	EC CORP	1,272,753 NS	$37.38M	0.501%	US
ICON plc	ICLR	— IE0005711209	EC CORP	329,145 NS	$36.42M	0.488%	IE
FNMA or FHLMC UMBS, 30 Year, Single Family	—	01F052649 US01F0526495	ABS-MBS USGSE	34,000,000 PA	$34.16M	0.457%	US
United States of America U.S. Treasury Notes	—	91282CPS4 US91282CPS43	DBT UST	34,200,000 PA	$33.94M	0.455%	US
Cognizant Technology Solutions Corp. Cognizant Technology Solutions Corp., Class A	CTSH	192446102 US1924461023	EC CORP	550,723 NS	$33.79M	0.453%	US
Target Corp.	TGT	87612E106 US87612E1064	EC CORP	278,147 NS	$33.71M	0.452%	US
PPG Industries, Inc.	PPG	693506107 US6935061076	EC CORP	312,514 NS	$33.40M	0.447%	US
Warner Bros Discovery, Inc.	WBD	934423104 US9344231041	EC CORP	1,215,093 NS	$33.37M	0.447%	US
Diamondback Energy, Inc.	FANG	25278X109 US25278X1090	EC CORP	165,912 NS	$32.82M	0.440%	US
Wells Fargo & Co.	WFC	949746101 US9497461015	EC CORP	406,727 NS	$32.38M	0.434%	US
Exelon Corp.	EXC	30161N101 US30161N1019	EC CORP	644,873 NS	$31.61M	0.423%	US
Roche Holding AG	—	— CH1499059983	EC CORP	75,279 NS	$29.73M CHF	0.398%	CH
FHLMC Pool UMBS	—	3132DWDC4 US3132DWDC47	ABS-MBS USGSE	35,634,486.86 PA	$28.87M	0.387%	US
Delta Air Lines, Inc.	DAL	247361702 US2473617023	EC CORP	431,139 NS	$28.66M	0.384%	US
US Foods Holding Corp.	USFD	912008109 US9120081099	EC CORP	306,310 NS	$28.24M	0.378%	US
Glencore plc	—	— JE00B4T3BW64	EC CORP	3,544,446 NS	$27.01M GBP	0.362%	JE
United States of America U.S. Treasury Bonds	—	912810TD0 US912810TD00	DBT UST	44,658,400 PA	$26.91M	0.360%	US
AGCO Corp.	AGCO	001084102 US0010841023	EC CORP	231,554 NS	$26.83M	0.359%	US
Suncor Energy, Inc.	SU	867224107 CA8672241079	EC CORP	397,659 NS	$26.30M CAD	0.352%	CA
Diageo plc	—	— GB0002374006	EC CORP	1,367,508 NS	$25.41M GBP	0.340%	GB
Smurfit Westrock plc	SW	— IE00028FXN24	EC CORP	631,678 NS	$25.17M	0.337%	IE
Eaton Corp. plc	ETN	— IE00B8KQN827	EC CORP	69,200 NS	$24.75M	0.332%	IE
United States of America U.S. Treasury Notes	—	91282CMZ1 US91282CMZ13	DBT UST	24,000,000 PA	$23.97M	0.321%	US
Avery Dennison Corp.	AVY	053611109 US0536111091	EC CORP	134,583 NS	$23.24M	0.311%	US
Travelers Cos., Inc. (The)	TRV	89417E109 US89417E1091	EC CORP	79,590 NS	$23.21M	0.311%	US
Albertsons Cos., Inc. Albertsons Cos., Inc., Class A	ACI	013091103 US0130911037	EC CORP	1,342,997 NS	$22.88M	0.307%	US
Boeing Co. (The)	—	097023204 US0970232049	EP CORP	338,957 NS	$21.99M	0.295%	US
United States of America U.S. Treasury Notes	—	91282CPJ4 US91282CPJ44	DBT UST	22,500,000 PA	$21.95M	0.294%	US
United States of America U.S. Treasury Bonds	—	912810RB6 US912810RB61	DBT UST	27,861,000 PA	$21.40M	0.287%	US
Agilent Technologies, Inc.	A	00846U101 US00846U1016	EC CORP	181,712 NS	$20.71M	0.277%	US
United States of America U.S. Treasury Notes	—	91282CKJ9 US91282CKJ98	DBT UST	20,300,000 PA	$20.45M	0.274%	US
Waste Management, Inc.	—	94106LBW8 US94106LBW81	DBT CORP	19,470,000 PA	$19.69M	0.264%	US
Humana, Inc.	HUM	444859102 US4448591028	EC CORP	113,267 NS	$19.64M	0.263%	US
United States of America U.S. Treasury Bonds	—	912810TV0 US912810TV08	DBT UST	20,000,000 PA	$19.45M	0.260%	US
UBS Group AG	—	902613AE8 US902613AE83	DBT CORP	21,679,000 PA	$19.10M	0.256%	CH
Altria Group, Inc.	MO	02209S103 US02209S1033	EC CORP	288,465 NS	$19.04M	0.255%	US
Dryden 86 CLO Ltd. Dryden 86 CLO Ltd., Series 2020-86A, Class BR2	—	26245XBC0 US26245XBC02	ABS-CBDO CORP	18,968,331 PA	$18.97M	0.254%	KY
Airbnb, Inc. Airbnb, Inc., Class A	ABNB	009066101 US0090661010	EC CORP	148,406 NS	$18.74M	0.251%	US
Morgan Stanley	—	6174468L6 US6174468L62	DBT CORP	20,096,000 PA	$18.66M	0.250%	US
Rockford Tower CLO Ltd. Rockford Tower CLO Ltd., Series 2020-1A, Clas…	—	77341EBC8 US77341EBC84	ABS-CBDO CORP	18,536,627 PA	$18.42M	0.247%	KY
Charles Schwab Corp. (The)	—	808513CE3 US808513CE32	DBT CORP	16,902,000 PA	$17.75M	0.238%	US
BAT International Finance plc	—	05530QAP5 US05530QAP54	DBT CORP	17,670,000 PA	$17.68M	0.237%	GB
MF1 MF1, Series 2024-FL16, Class A	—	55287EAA5 US55287EAA55	ABS-CBDO CORP	17,590,246 PA	$17.65M	0.236%	KY
Tyson Foods, Inc. Tyson Foods, Inc., Class A	TSN	902494103 US9024941034	EC CORP	271,273 NS	$17.38M	0.233%	US
BANK BANK, Series 2023-BNK46, Class A4	—	06541DBH6 US06541DBH61	ABS-MBS CORP	16,647,021 PA	$17.32M	0.232%	US
STWD Ltd. STWD Ltd., Series 2022-FL3, Class AS	—	78485KAE5 US78485KAE55	ABS-CBDO CORP	17,154,000 PA	$17.13M	0.230%	KY
Flowserve Corp.	FLS	34354P105 US34354P1057	EC CORP	230,220 NS	$16.92M	0.227%	US
Dryden 75 CLO Ltd. Dryden 75 CLO Ltd., Series 2019-75A, Class BR3	—	26252JBE7 US26252JBE73	ABS-CBDO CORP	16,953,585 PA	$16.84M	0.226%	KY
TRTX Issuer Ltd. TRTX Issuer Ltd., Series 2025-FL7, Class A	—	87277LAA4 US87277LAA44	ABS-CBDO CORP	16,758,371 PA	$16.76M	0.225%	KY
BXMT Ltd. BXMT Ltd., Series 2021-FL4, Class AS	—	05609GAC2 US05609GAC24	ABS-CBDO CORP	16,816,500 PA	$16.74M	0.224%	KY