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Form 8-K

sec.gov

8-K — CITIGROUP INC

Accession: 0001193125-26-401022

Filed: 2026-09-24

Period: 2026-09-17

CIK: 0000831001

SIC: 6021 (NATIONAL COMMERCIAL BANKS)

Item: Financial Statements and Exhibits

Documents

8-K — d155919d8k.htm (Primary)

EX-5.01 (d155919dex501.htm)

EX-99.01 (d155919dex9901.htm)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: d155919d8k.htm · Sequence: 1

8-K

false0000831001 0000831001 2026-09-17 2026-09-17 0000831001 us-gaap:CommonStockMember 2026-09-17 2026-09-17 0000831001 c:NoncumulativePreferredStockSeriesIIMember 2026-09-17 2026-09-17 0000831001 c:CitigroupCapitalIIIMember 2026-09-17 2026-09-17 0000831001 c:CitigroupCapitalXIIIMember 2026-09-17 2026-09-17 0000831001 c:SeriesNMediumTermSeniorNotesDueApr2028Member 2026-09-17 2026-09-17 0000831001 c:SeriesNMediumTermSeniorNotesDueSept2026Member 2026-09-17 2026-09-17 0000831001 c:SeriesNMediumTermSeniorNotesDueSept2028Member 2026-09-17 2026-09-17 0000831001 c:SeriesNMediumTermSeniorNotesDueOct2028Member 2026-09-17 2026-09-17 0000831001 c:SeriesNMediumTermSeniorNotesDueMar2029Member 2026-09-17 2026-09-17

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM

8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported)

September 17, 2026

Citigroup Inc.

(Exact name of registrant as specified in its charter)

Delaware

1-9924

52-1568099

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

388 Greenwich Street, New York,

New York

10013

(Address of principal executive offices)

(Zip Code)

(212)

559-1000

(Registrant’s telephone number,

including area code)

Check the appropriate box below if the Form

8-K

filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule

14a-12

under the Exchange Act (17 CFR

240.14a-12)

☐

Pre-commencement

communications pursuant to Rule

14d-2(b)

under the Exchange Act (17 CFR

240.14d-2(b))

☐

Pre-commencement

communications pursuant to Rule

13e-4(c)

under the Exchange Act (17 CFR

240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934 formatted in Inline XBRL: See Exhibit 99.01

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule

12b-2

of the Securities Exchange Act of 1934 (17 CFR

§240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Citigroup Inc.

Current Report on Form 8-K

Item 9.01

Financial Statements and Exhibits.

(d)

Exhibits:

Exhibit

No.

Description

5.01

Opinion of Karen Wang, Esq.

99.01

Citigroup Inc. securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934 as of the filing date.

104

The cover page of this Current Report on Form 8-K, formatted in Inline XBRL.

1

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: September 24, 2026

CITIGROUP INC.

By:

/s/ Karen Wang

Karen Wang

Assistant Secretary

2

EX-5.01

EX-5.01

Filename: d155919dex501.htm · Sequence: 2

EX-5.01

Exhibit 5.01

September 24, 2026

Citigroup Inc.

388 Greenwich Street

New York, New York 10013

Ladies and Gentlemen:

I am a Director—Corporate Securities Issuance Legal of Citigroup Inc., a Delaware corporation (the “Company”). I refer to the

offerings of (i) $3,500,000,000 5.266% Fixed Rate / Floating Rate Senior Notes due September 24, 2029 of the Company (the “2029 Securities”), (ii) $3,500,000,000 5.583% Fixed Rate / Floating Rate Senior Notes due September 24,

2032 of the Company (the “2032 Securities”), (iii) $4,500,000,000 5.860% Fixed Rate / Floating Rate Senior Notes due September 24, 2037 of the Company (the “2037 Securities”) and (iv) Floating Rate Senior Notes due

September 24, 2029 of the Company (the “Floating Rate Securities” and, together with the 2029 Securities, the 2032 Securities and the 2037 Securities, the “Securities”) pursuant to the registration statement on Form S-3ASR (No. 333-293732) and the prospectus dated February 25, 2025, as supplemented by the prospectus supplement, dated September 17, 2026 (together, the

“Prospectus”). The Securities were issued pursuant to the senior debt indenture dated as of November 13, 2013, as amended (the “Indenture”), between the Company and The Bank of New York Mellon, as the trustee.

I have examined originals or copies, certified or otherwise identified to my satisfaction, of such documents, corporate records, certificates

of public officials and other instruments and have conducted such other investigations of fact and law as I have deemed necessary or advisable for the purposes of this opinion. In such examination, I have assumed the legal capacity of all natural

persons, the genuineness of all signatures (other than those of officers of the Company), the authenticity of all documents submitted to me as originals, the conformity to original documents of all documents submitted to me as certified or

photostatic copies and the authenticity of the original of such copies.

Upon the basis of the foregoing, I am of the opinion that the

Securities have been validly authorized and are validly issued and outstanding obligations of the Company enforceable in accordance with their terms and entitled to the benefits of the Indenture (subject, as to enforcement, to applicable bankruptcy,

reorganization, insolvency, moratorium or other similar laws affecting creditors’ rights generally and to general principles of equity regardless of whether such enforceability is considered in a proceeding in equity or at law).

Citigroup Inc.

Page

2

My opinion is limited to matters governed by the Federal laws of the United States of

America, the laws of the State of New York and the General Corporation Law of the State of Delaware (including the applicable provisions of the Delaware Constitution and the reported judicial decisions interpreting the General Corporation Law of the

State of Delaware and such applicable provisions of the Delaware Constitution). I am not admitted to the practice of law in the State of Delaware.

I consent to the filing of this opinion as Exhibit 5.01 to the Company’s Current Report on Form

8-K dated September 24, 2026 and to the reference to my name in the Prospectus under the heading “Legal Matters.” In giving such consent, I do not thereby admit that I come within the category

of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Securities and Exchange Commission thereunder.

Very truly yours,

/s/ Karen Wang

Name: Karen Wang

Title: Director—

Corporate Securities Issuance Legal

EX-99.01

EX-99.01

Filename: d155919dex9901.htm · Sequence: 3

EX-99.01

Exhibit 99.01

Citigroup Inc. securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:

Title of each class

Ticker Symbol(s)

Title for iXBRL

Name of each

exchange on

which registered

Common Stock, par value $.01 per share

C

Common Stock, par value $.01 per share

New York Stock Exchange

Depositary Shares, each representing a 1/1,000th interest in a share of 6.250% Noncumulative Preferred Stock, Series II

C PR R

Dep Shs, represent 1/1,000th interest in a share of 6.250% Noncum Pref Stk, Ser II

New York Stock Exchange

7.625% Trust Preferred Securities of Citigroup Capital III (and registrant’s guaranty with respect thereto)

C/36Y

7.625% TRUPs of Cap III (and registrant’s guaranty)

New York Stock Exchange

7.875% Fixed Rate / Floating Rate Trust Preferred Securities (TruPS

®

) of Citigroup Capital XIII (and registrant’s guaranty with respect thereto)

C N

7.875% FXD / FRN TruPS of Cap XIII (and registrant’s guaranty)

New York Stock Exchange

Medium-Term Senior Notes, Series N, Floating Rate Notes Due April 26, 2028 of CGMHI (and registrant’s guaranty with respect thereto)

C/28

MTN, Series N, Floating Rate Notes Due Apr 26, 2028 of CGMHI (and registrant’s guaranty)

New York Stock Exchange

Medium-Term Senior Notes, Series N, Floating Rate Notes Due September 17, 2026 of CGMHI (and registrant’s guaranty with respect thereto)

C/26

MTN, Series N, Floating Rate Notes Due Sept 2026 of CGMHI (and registrant’s guaranty)

New York Stock Exchange

Medium-Term Senior Notes, Series N, Floating Rate Notes Due September 15, 2028 of CGMHI (and registrant’s guaranty with respect thereto)

C/28A

MTN, Series N, Floating Rate Notes Due Sept 2028 of CGMHI (and registrant’s guaranty)

New York Stock Exchange

Medium-Term Senior Notes, Series N, Floating Rate Notes Due October 6, 2028 of CGMHI (and registrant’s guaranty with respect thereto)

C/28B

MTN, Series N, Floating Rate Notes Due Oct 2028 of CGMHI (and registrant’s guaranty)

New York Stock Exchange

Medium-Term Senior Notes, Series N, Floating Rate Notes Due March 21, 2029 of CGMHI (and registrant’s guaranty with respect thereto)

C/29A

MTN, Series N, Floating Rate Notes Due Mar 2029 of CGMHI (and registrant’s guaranty)

New York Stock Exchange

1

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Sep. 17, 2026

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Document Information [Line Items]

Title of 12(b) Security

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Trading Symbol

C PR R

Security Exchange Name

NYSE

Citigroup Capital III [Member]

Document Information [Line Items]

Title of 12(b) Security

7.625% TRUPs of Cap III (and registrant’s guaranty)

Trading Symbol

C/36Y

Security Exchange Name

NYSE

Citigroup Capital XIII [Member]

Document Information [Line Items]

Title of 12(b) Security

7.875% FXD / FRN TruPS of Cap XIII (and registrant’s guaranty)

Trading Symbol

C N

Security Exchange Name

NYSE

Series N Medium Term Senior Notes Due Apr 2028 [Member]

Document Information [Line Items]

Title of 12(b) Security

MTN, Series N, Floating Rate Notes Due Apr 26, 2028 of CGMHI (and registrant’s guaranty)

Trading Symbol

C/28

Security Exchange Name

NYSE

Series N Medium Term Senior Notes Due Sept 2026 [Member]

Document Information [Line Items]

Title of 12(b) Security

MTN, Series N, Floating Rate Notes Due Sept 2026 of CGMHI (and registrant’s guaranty)

Trading Symbol

C/26

Security Exchange Name

NYSE

Series N Medium Term Senior Notes Due Sept 2028 [Member]

Document Information [Line Items]

Title of 12(b) Security

MTN, Series N, Floating Rate Notes Due Sept 2028 of CGMHI (and registrant’s guaranty)

Trading Symbol

C/28A

Security Exchange Name

NYSE

Series N Medium Term Senior Notes Due Oct 2028 [Member]

Document Information [Line Items]

Title of 12(b) Security

MTN, Series N, Floating Rate Notes Due Oct 2028 of CGMHI (and registrant’s guaranty)

Trading Symbol

C/28B

Security Exchange Name

NYSE

Series N Medium Term Senior Notes Due Mar 2029 [Member]

Document Information [Line Items]

Title of 12(b) Security

MTN, Series N, Floating Rate Notes Due Mar 2029 of CGMHI (and registrant’s guaranty)

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