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

UNUM GROUP

(Exact name of registrant as specified in its charter)

Delaware

001-11294

62-1598430

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

Date of Report (Date of earliest event reported): March 4, 2026

UNUM GROUP

(Exact name of registrant as specified in its charter)

Delaware

001-11294

62-1598430

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

1 Fountain Square

Chattanooga, Tennessee 37402

(Address of principal executive offices) (Zip Code)

(423) 294-1011

(Registrant's telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

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 (see General Instruction A.2. below):

☐ 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))

☐ 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 Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common stock, $0.10 par value

UNM

New York Stock Exchange

6.250% Junior Subordinated Notes due 2058

UNMA

New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

☐ Emerging growth company


☐			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.

☐Item If5.03 Amendments ~~an emerging growth company, indicate by check mark if the registrant has elected not~~ to ~~use~~Articles ~~the~~of ~~extended~~Incorporation ~~transition period for complying with any new~~ or ~~revised~~Bylaws; ~~financial~~Change ~~accounting~~in ~~standards~~Fiscal ~~provided pursuant to Section 13(a) of the Exchange Act~~Year.

~~Item~~On ~~2.02 Results~~March 4, 2026, the Board of ~~Operations~~Directors of Unum Group (the “Company”) adopted amendments to the Company's Amended and ~~Financial~~Restated ~~Condition~~Bylaws (the “Bylaws”).

OnThe ~~February~~ reference to "Chairman" was changed to "Chair" throughout the Bylaws. Article II, Section 1 of the Bylaws was amended to clarify that shareholders who participate in shareholder meetings remotely are counted as "in person" at the meeting for purposes of calculating votes. Article II, Section 5 of the Bylaws was amended to clarify that the denominator for counting shareholder votes only includes shares present at the meeting and entitled to vote on the specific matter. Article II, ~~2026~~Section 6 of the Bylaws was amended to include a provision allowing the Board to determine prior to the shareholders meeting that a proposal/nomination was not properly brought. Article II, ~~Unum~~Section ~~Group~~6 ~~issued~~of the Bylaws was amended to clarify that the provision of updated information in a ~~news~~shareholder ~~release~~proposal ~~reporting~~or ~~its~~about ~~results~~a director nominee does not necessarily cure prior deficiencies in the notice. Article II, Section 6 of the Bylaws was amended to add definitions for "business day" and "close of business." Article II, Section 6 of the ~~fourth~~Bylaws ~~quarter~~was amended to remove language regarding shareholder proposal rules promulgated under the Securities Act of ~~2025~~1934. Article III, Section 1 of the Bylaws was amended to remove language regarding submission of an offer of resignation by a ~~copy~~director after a contested election. Article III, Section 2 of ~~which~~the isBylaws ~~furnished~~was ~~herewith~~amended asto ~~Exhibit~~add 99language limiting the Company's right to require additional information about a director nominee to information needed to determine the nominee's eligibility. Article III, Section 12 of the Bylaws was amended to remove a provision regarding interested director transactions. Article V of the Bylaws was amended to remove certain formalities concerning uncertificated shares and lost share certificates. Article III, Section 6 and Article IV, Section 1 of the Bylaws were amended to ~~this~~remove ~~Current~~references ~~Report~~to onobsolete ~~Form~~technology. ~~8-K~~Article VIII of the Bylaws was amended to update the list of individuals eligible for indemnification. In addition, certain other technical and ~~incorporated~~non-substantive ~~herein~~amendments bywere ~~reference~~made in various sections of the Bylaws.

~~Also~~The onabove ~~February 5,~~description ~~2026,~~of ~~Unum~~the ~~Group~~amendments ~~made~~to ~~available~~the onBylaws ~~its~~is ~~investor~~qualified ~~relations~~in ~~website~~its atentirety ~~www.investors.unum.com~~by ~~the~~reference ~~Statistical Supplement relating~~ to ~~its~~the ~~financial~~full ~~results~~text ~~for~~of the ~~fourth~~Bylaws, ~~quarter~~as ofamended ~~2025. A~~and restated, a copy of ~~the~~which ~~Statistical Supplement~~ is ~~furnished~~attached ~~herewith~~hereto as Exhibit 993.21 and incorporated herein by reference.

In accordance with General Instruction B.2 of Form 8-K, the information furnished pursuant to this Item 2.02, including Exhibits 99.1 and 99.2, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference into any of Unum Group's filings under the Securities Act of 1933 or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 7.01 Regulation FD Disclosure.

On February 5, 2026, Unum Group made available on its investor relations website at www.investors.unum.com a slide presentation with 2026 outlook that will accompany its fourth quarter 2025 earnings conference call scheduled for February 6, 2026. A copy of the slide presentation is furnished herewith as Exhibit 99.3 and incorporated herein by reference.

In accordance with General Instruction B.2 of Form 8-K, the information furnished pursuant to this Item 7.01, including Exhibit 99.3, shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference into any of Unum Group's filings under the Securities Act of 1933 or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.
Exhibit No.						Description
99.1						News release of Unum Group dated February 5, 2026, concerning earnings for the fourth quarter of 2025.
99.2						Statistical Supplement of Unum Group for the fourth quarter of 2025.
99.3						Slide presentation of Unum Group with 2026 outlook.
104						Cover Page Interactive Data File (embedded within the Inline XBRL document).

(d) Exhibits.


Exhibit No.						Description
3.1						Amended and Restated Bylaws of Unum Group, effective March 4, 2026
104						Cover Page Interactive Data File (embedded with the Inline XBRL document).

SIGNATURES

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.

	Unum Group
	(Registrant)
Date: February 5, 2026	By:	/s/ J. Paul Jullienne
Date: March 6, 2026	By:	/s/ J. Paul Jullienne
		Name:	J. Paul Jullienne
		Title:	Vice President, Managing Counsel, and
			Corporate Secretary

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