Vanguard reports 0% stake in ADTRAN (Amend. No.18)

ADTRAN Holdings Inc — Amendment No. 18 to a Schedule 13G/A shows The Vanguard Group reporting 0 shares beneficially owned and 0% of the class as of the amendment.

Rhea-AI Filing Summary

ADTRAN Holdings Inc — Amendment No. 18 to a Schedule 13G/A shows The Vanguard Group reporting 0 shares beneficially owned and 0% of the class as of the amendment. The filing explains an internal realignment completed on 01/12/2026 under SEC Release No. 34-39538 that caused disaggregated reporting by Vanguard subsidiaries. The filing lists Vanguard's address and is signed by Ashley Grim on 03/26/2026.

Insights

Compliance Counsel

Filing documents disaggregation under SEC Release No. 34-39538; no beneficial ownership reported.

The amendment states Vanguard completed an internal realignment on 01/12/2026 and, in reliance on SEC Release No. 34-39538, certain subsidiaries now report separately. The filing explicitly records 0 shares and 0% ownership.

Operationally, this is an administrative disclosure change tied to internal structure; cash‑flow treatment is not stated in the excerpt.

Institutional Investor Analyst

Administrative ownership update; no direct change to ADTRAN ownership indicated.

The document lists Vanguard's beneficial ownership as 0 shares and notes that subsidiaries pursuing prior strategies will report separately after realignment. The excerpt does not indicate purchases, sales, or proceeds.

Market impact appears neutral; subsequent filings from reporting subsidiaries may show holdings if material.

FAQ

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

What did The Vanguard Group report for ADTN in Amendment No. 18?

The Vanguard Group reported 0 shares beneficially owned, representing 0% of ADTRAN's common stock. The amendment discloses an internal realignment leading to disaggregated reporting under SEC Release No. 34-39538.

Why does Vanguard now report separately for ADTN holdings?

Vanguard completed an internal realignment on 01/12/2026, and per SEC Release No. 34-39538 certain subsidiaries now report beneficial ownership separately. The filing states these subsidiaries pursue the same investment strategies as before.

Does Amendment No. 18 show any Vanguard purchases or sales of ADTN shares?

No transaction is reported in the excerpt; the filing records 0 shares and 0% ownership. The amendment explains reporting changes tied to organizational realignment rather than trading activity.

Who signed the Schedule 13G/A amendment for Vanguard and when?

The filing is signed by Ashley Grim, Head of Global Fund Administration, with the signature date shown as 03/26/2026. The cover lists the amendment date as 03/13/2026.

Will this amendment affect ADTN's outstanding shares or control?

The amendment is a reporting change reflecting Vanguard's internal structure; it lists 0 shares and 0% ownership. It does not state any change to ADTRAN's outstanding shares or governance.

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

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Accepted by SEC EDGAR 03/26/2026 - 03:12 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 18)

ADTRAN Holdings Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

(CUSIP Number)

03/13/2026

(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 No.

1

Names of Reporting Persons

The Vanguard Group

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

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: On January 12, 2026, The Vanguard Group, Inc. went through an internal realignment. In accordance with SEC Release No. 34-39538 (January 12, 1998), certain subsidiaries or business divisions of subsidiaries of The Vanguard Group, Inc., that formerly had, or were deemed to have, beneficial ownership with The Vanguard Group, Inc., will report beneficial ownership separately (on a disaggregated basis) from The Vanguard Group, Inc. in reliance on such release. These subsidiaries and/or business divisions pursue the same investment strategies as previously pursued by The Vanguard Group, Inc. prior to the realignment. Further in accordance with SEC Release No. 34-39538 (January 12, 1998), The Vanguard Group, Inc. no longer has, or is deemed to have, beneficial ownership over securities beneficially owned by such subsidiaries and/or business divisions.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ADTRAN Holdings Inc
(b)	Address of issuer's principal executive offices: 901 Explorer Blvd, Huntsville, AL, 35806
Item 2.
(a)	Name of person filing: The Vanguard Group
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd.,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.:
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: 0
(b)	Percent of class: 0 %
(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: 0
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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. The Vanguard Group, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
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.

The Vanguard Group

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	03/26/2026