State Street Reports 5.1% Stake in Magnolia Oil & Gas

State Street Corporation files a Schedule 13G reporting ownership of 9,496,275 shares of Magnolia Oil & Gas Corp as of 03/31/2026.

Rhea-AI Filing Summary

State Street Corporation files a Schedule 13G reporting ownership of 9,496,275 shares of Magnolia Oil & Gas Corp as of 03/31/2026. The filing states this represents 5.1% of the class, with 9,314,837 shares of shared voting power and 9,496,275 shares of shared dispositive power.

The filing lists several State Street advisory subsidiaries as the acquiring entities and is signed by a company officer on 05/12/2026.

Insights

Institutional Ownership Analyst

State Street reports a passive >5% stake in Magnolia (MGY).

State Street Corporation discloses 9,496,275 shares beneficially owned, equal to 5.1% of outstanding common stock as of 03/31/2026. The position is reported under shared voting and dispositive power across advisory subsidiaries.

Filing classifies the holding as passive under Schedule 13G conventions; future filings could show changes if the ownership purpose or voting control shifts.

Corporate Governance Specialist

Shared power across advisory subsidiaries is typical for asset managers.

The disclosure names multiple State Street advisor entities that hold voting or dispositive power on behalf of clients. The filing indicates shared voting power of 9,314,837 and shared dispositive power of 9,496,275.

These entries signal portfolio ownership by client accounts rather than a single controlling investor; subsequent Schedule 13D or Form 13F filings could provide additional context.

Key Figures

Filing date/As of: 03/31/2026 Beneficial ownership: 9,496,275 shares Percent of class: 5.1% +3 more

6 metrics

Filing date/As of <date>03/31/2026</date> Ownership measured as of this date

Beneficial ownership 9,496,275 shares Amount beneficially owned reported on Schedule 13G

Percent of class 5.1% Percent of common stock reported in Item 4(b)

Shared voting power 9,314,837 shares Item 4(c)(ii) shared power to vote

Shared dispositive power 9,496,275 shares Item 4(c)(iv) shared power to dispose

Signature date <date>05/12/2026</date> Signature by State Street officer on filing

Key Terms

Schedule 13G, Beneficial ownership, Shared dispositive power

3 terms

Schedule 13G regulatory

"Name of form: SCHEDULE 13G; used for passive beneficial owners"

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.

Beneficial ownership regulatory

"Item 4. | Amount beneficially owned: 9496275.00"

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 dispositive power regulatory

"Item 4(c)(iv) Shared power to dispose or to direct the disposition of: 9,496,275"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does State Street report in MAGNOLIA OIL & GAS CORP (MGY)?

State Street reports beneficial ownership of 9,496,275 shares, equal to 5.1% of common stock as of 03/31/2026. This figure is reported as shared voting and dispositive power across State Street advisory subsidiaries in the Schedule 13G.

Does the Schedule 13G indicate active control by State Street for MGY?

No, the Schedule 13G filing reports a passive investment classification rather than active control. It lists shared voting power of 9,314,837 and shared dispositive power of 9,496,275 held through advisory subsidiaries, consistent with portfolio-management reporting.

Which State Street entities are named as holding MGY shares?

The filing names multiple advisory subsidiaries, including SSGA Funds Management, Inc., State Street Global Advisors Europe Limited, and others. These entities are listed as the subsidiaries with voting or dispositive authority over the reported 9,496,275 shares.

What is the timing and signature on the Schedule 13G for MGY?

The ownership is reported as of 03/31/2026, and the Schedule 13G is signed by Elizabeth Schaefer (Senior Vice President, Chief Accounting Officer) on 05/12/2026, according to the filing header and signature block.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/12/2026 - 11:28 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

MAGNOLIA OIL & GAS CORP

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

559663109

(CUSIP Number)

03/31/2026

(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): 559663109

1

Names of Reporting Persons

STATE STREET CORPORATION

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

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,314,837.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,496,275.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,496,275.00

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)

5.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MAGNOLIA OIL & GAS CORP
(b)	Address of issuer's principal executive offices: 9 GREENWAY PLAZA SUITE 1300, HOUSTON, TEXAS, 77046
Item 2.
(a)	Name of person filing: STATE STREET CORPORATION;
(b)	Address or principal business office or, if none, residence: ONE CONGRESS STREET, SUITE 1, BOSTON MA 02114, UNITED STATES
(c)	Citizenship: MA
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP Number(s): 559663109
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: 9496275.00
(b)	Percent of class: 5.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 9,314,837
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 9,496,275
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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. 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. SSGA FUNDS MANAGEMENT, INC. (IA);STATE STREET GLOBAL ADVISORS EUROPE LIMITED (IA);STATE STREET GLOBAL ADVISORS LIMITED (IA);STATE STREET GLOBAL ADVISORS SINGAPORE LIMITED (IA);STATE STREET GLOBAL ADVISORS TRUST COMPANY (IA);STATE STREET GLOBAL ADVISORS, LTD. (IA);
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. NOT APPLICABLE
Item 9.	Notice of Dissolution of Group.
	Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5. 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.

STATE STREET CORPORATION

Signature:	ELIZABETH SCHAEFER
Name/Title:	SENIOR VICE PRESIDENT, CHIEF ACCOUNTING OFFICER
Date:	05/12/2026