Form DEFA14A ADTRAN Holdings, Inc.

FREE Breaking News Alerts from StreetInsider.com!

StreetInsider.com Top Tickers, 6/22/2026

1. SPCX
2. NVDA
3. ACN
4. USO
5. GOOGL

6. APGE
7. DFTX
8. MU
9. IBM
10. HOOD

March 27, 2026 6:55 AM EDT

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(Rule 14a-101)

INFORMATION REQUIRED IN PROXY STATEMENT

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

_______________________

Filed by the Registrant ☒

Filed by a party other than the Registrant ☐

Check the appropriate box:


☐			Preliminary Proxy Statement
☐			Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐			Definitive Proxy Statement
☒			Definitive Additional Materials
☐			Soliciting Material under §240.14a-12

     ADTRAN Holdings, Inc. 

    

     (Name of Registrant as Specified In Its Charter) 

    

     Not applicable.
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):


☒		No fee required
☐		Fee paid previously with preliminary materials
☐		Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

ATTACHMENTS / EXHIBITS

SEC Filings

Sign up for StreetInsider Free!

Receive full access to all new and archived articles, unlimited portfolio tracking, e-mail alerts, custom newswires and RSS feeds - and more!