Ameriprise, Columbia report 6.3% Diversified Energy (DEC) ownership stake

Rhea-AI Filing Summary

Ameriprise Financial, Inc. and its subsidiary Columbia Management Investment Advisers, LLC report beneficial ownership of Diversified Energy Company common stock on an amended Schedule 13G. AFI, as parent of CMIA, may be deemed to beneficially own the shares reported by CMIA, though both entities disclaim beneficial ownership.

AFI reports 4,570,807 shares of Diversified Energy Company common stock with shared dispositive power and 4,188,439 shares with shared voting power, representing 6.3% of the class. CMIA reports 4,540,266 shares with shared dispositive power and the same 4,188,439 shares with shared voting power, also representing 6.3% of the class. Neither entity reports sole voting or sole dispositive power over any shares.

Key Figures

AFI shared voting power: 4,188,439 shares AFI shared dispositive power: 4,570,807 shares AFI percent of class: 6.3% +3 more

6 metrics

AFI shared voting power 4,188,439 shares Shares of Diversified Energy common stock over which AFI has shared voting power

AFI shared dispositive power 4,570,807 shares Shares of Diversified Energy common stock over which AFI has shared dispositive power

AFI percent of class 6.3% Percentage of Diversified Energy common stock class reported by AFI

CMIA shared dispositive power 4,540,266 shares Shares of Diversified Energy common stock over which CMIA has shared dispositive power

CMIA shared voting power 4,188,439 shares Shares of Diversified Energy common stock over which CMIA has shared voting power

CMIA percent of class 6.3% Percentage of Diversified Energy common stock class reported by CMIA

Key Terms

beneficial ownership, shared voting power, shared dispositive power, parent holding company, +1 more

5 terms

beneficial ownership financial

"AFI, as the parent company of CMIA, may be deemed to beneficially own the shares"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

shared voting power financial

"Shared Voting Power 4,188,439.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 4,570,807.00"

parent holding company financial

"If a parent holding company has filed this schedule, pursuant to (ii)(G)"

Schedule 13G regulatory

"Each of AFI and CMIA disclaims beneficial ownership of any shares reported on this Schedule."

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

What stake in Diversified Energy Company (DEC) does Ameriprise report?

Ameriprise Financial, Inc. reports 4,570,807 Diversified Energy Company common shares with shared dispositive power, and 4,188,439 shares with shared voting power, representing 6.3% of the outstanding common stock.

How many Diversified Energy (DEC) shares does Columbia Management Investment Advisers hold?

Columbia Management Investment Advisers, LLC reports beneficial ownership of 4,540,266 Diversified Energy common shares with shared dispositive power and 4,188,439 shares with shared voting power, also representing 6.3% of the common stock class.

Do Ameriprise (DEC filing) and Columbia claim full beneficial ownership of these shares?

No. The filing states that Ameriprise Financial, Inc. and Columbia Management Investment Advisers, LLC each disclaim beneficial ownership of the shares reported on the Schedule 13G, even though AFI may be deemed to own CMIA’s reported shares as its parent.

What type of security in Diversified Energy (DEC) is reported in this Schedule 13G/A?

The Schedule 13G/A covers Common Stock of Diversified Energy Company identified by CUSIP 25520W107. The filing details voting and dispositive powers over this class of securities held by the reporting entities.

What voting power over Diversified Energy (DEC) shares is reported by Ameriprise and Columbia?

Both entities report 0 shares with sole voting power and 4,188,439 shares with shared voting power in Diversified Energy Company common stock. All dispositive and voting authority disclosed is on a shared, not sole, basis.

Who signed the amended Schedule 13G/A for the Diversified Energy (DEC) position?

The report is signed by Michael G. Clarke, identified as Senior Vice President, North America Head of Operations & Investor Services, on behalf of the reporting entities, with a signature date of 08/14/2026.

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Available on EDGAR 08/14/2026 - 10:16 AM Accepted by SEC EDGAR 08/14/2026 - 10:15 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Diversified Energy Company

(Name of Issuer)

Common Stock

(Title of Class of Securities)

25520W107

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 25520W107

1

Names of Reporting Persons

Ameriprise Financial, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 4,188,439.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,570,807.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,570,807.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.3 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 25520W107

1

Names of Reporting Persons

Columbia Management Investment Advisers, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MINNESOTA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 4,188,439.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 4,540,266.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,540,266.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.3 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Diversified Energy Company
(b)	Address of issuer's principal executive offices: 1600 Corporate Drive, Birmingham, Alabama 35242
Item 2.
(a)	Name of person filing: (a) Ameriprise Financial, Inc. ("AFI") (b) Columbia Management Investment Advisers, LLC ("CMIA")
(b)	Address or principal business office or, if none, residence: (a) 145 Ameriprise Financial Center, Minneapolis, MN 55474 (b) 290 Congress Street, Boston, MA 02210
(c)	Citizenship: (a) Delaware (b) Minnesota
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 25520W107
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: Incorporated by reference to Items (5)-(9) and (11) of the cover page pertaining to each reporting person. AFI, as the parent company of CMIA, may be deemed to beneficially own the shares reported herein by CMIA. Accordingly, the shares reported herein by AFI include those shares separately reported herein by CMIA. Each of AFI and CMIA disclaims beneficial ownership of any shares reported on this Schedule.
(b)	Percent of class: The information required by Item 4(b) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c) is set forth in Rows (5)-(9) and (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each Reporting Person.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. AFI: See Exhibit I
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Ameriprise Financial, Inc.

Signature:	/s/ Michael G. Clarke
Name/Title:	Michael G. Clarke, Senior Vice President, North America Head of Operations & Investor Services
Date:	08/14/2026

Columbia Management Investment Advisers, LLC

Signature:	/s/ Michael G. Clarke
Name/Title:	Michael G. Clarke, Senior Vice President, North America Head of Operations & Investor Services
Date:	08/14/2026

Comments accompanying signature: Contact Information Charles Chiesa VP Fund Treasurer Global Operations and Investor Services Telephone: 617-385-9593

Exhibit Information

Exhibit Index Exhibit I Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company. Exhibit II Joint Filing Agreement