Columbia Total Return Bond Fund

S000012097COLUMBIA FUNDS SERIES TRUST ICIK 0000773757

Share classes

7 classes of this one portfolio · 0 exchange-listed

Class ID	Symbol	Status	Security in the master	Type
C000032986	CIBRX	NOT_LISTED	not exchange-listed	—
C000121794	CTBRX	NOT_LISTED	not exchange-listed	—
C000122680	CTBYX	NOT_LISTED	not exchange-listed	—
C000032983	LIBAX	NOT_LISTED	not exchange-listed	—
C000032985	LIBCX	NOT_LISTED	not exchange-listed	—
C000255092	SRBAX	NOT_LISTED	not exchange-listed	—
C000032987	SRBFX	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.

2026-04-30

Filing

NPORT-P · filed 2026-06-25

Report date: 2026-04-30
Net assets: $3,063,064,767
Total assets: $3,549,462,100.74
Total liabilities: $486,397,333.74
Assets invested: $0
Cash not reported in C or D: $285,854.71
Amendment: No
Accession: 0001410368-26-066110

By asset category

N-PORT Item C.4.a

ABS-MBSAsset-backed: mortgage-ba…$1.49B43.6%

DBTDebt$892.83M26.2%

STIVShort-term investment veh…$289.34M8.5%

ABS-CBDOAsset-backed: collaterali…$288.32M8.5%

ABS-OAsset-backed: other$264.25M7.7%

LONLoan$162.31M4.8%

ECEquity - common$23.28M0.7%

DIRDerivative - interest rate$3.44M0.1%

DEDerivative - equity$7.4K0.0%

DCRDerivative - credit-$281.0K-0.0%

By asset category

By issuer category

N-PORT Item C.4.b

CORPCorporate$1.77B51.9%

USGSEUS government sponsored e…$675.38M19.8%

USGAUS government agency$517.67M15.2%

RFRegistered fund$289.34M8.5%

NUSSNon-US sovereign$148.78M4.4%

OTHEROther; the filer describe…$5.96M0.2%

USTUS Treasury$3.28M0.1%

By issuer category

By investment country

as filed

USUS$3.01B90.8%

KYKY$117.62M3.5%

MXMX$32.15M1.0%

GBGB$29.16M0.9%

CACA$23.39M0.7%

XXXX$20.82M0.6%

TRTR$18.66M0.6%

IDID$14.02M0.4%

ZAZA$13.42M0.4%

COCO$12.73M0.4%

PEPE$12.47M0.4%

BMBM$9.44M0.3%

By country

Classification look-through

Positions resolved to the master through ISIN, then rolled up through the taxonomy. 0.0% of reported value reaches a classification.

Not resolved to the master(1,237)$3.41B100.0%

Equity · Industrials(1)$134.4K0.0%

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 ($3.41B), not of the fund’s net assets ($3.06B). The two differ by cash, derivatives filed with no market value, and rounding.

Classification look-through

Holdings

1,238 positions in this filing

Issuer nameAsset categoryIssuer categoryCountry

Issuer↕	In master	CUSIP / ISIN	Asset	Balance↕	Value↕	Weight▲	Country
Standard Industries Inc Standard Industries Inc 2021 Term Loan B	—	85350EAB2 US85350EAB20	LON CORP

101–150 of 1,238

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Balance is meaningless without its unit. N-PORT Item C.2.a says what the balance column counts: shares (NS), principal amount (PA), contracts (NC), or something the filer describes (OU). A bond position read as a share count is off by orders of magnitude. Every balance on this page carries its unit code.

Missing CUSIPs are filed as placeholders. Filers with no CUSIP conventionally write 999999999 or N/A rather than leaving the field blank — 1,187,114 of 5,347,869 positions do. Those are shown as missing here, not as identifiers.