Welcome to our dedicated page for Adtran SEC filings (Ticker: ADTN), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
ADTRAN Holdings, Inc. filings document the public-company record for a networking and communications equipment provider listed on Nasdaq and the Frankfurt Stock Exchange. Its reports and current-event filings cover financial results, Regulation FD presentations, preliminary results disclosed under German and European market-abuse rules, and operating context for broadband access, optical networking and services.
Governance filings include definitive proxy materials, executive compensation arrangements, stock incentive plan awards, board and committee approvals, and compensation metrics tied to Adjusted EBIT and relative total shareholder return. Capital-structure disclosures include the company's completed issuance of 3.75% convertible senior notes due 2030, related indenture terms, conversion features, debt ranking and subsidiary liability considerations.
STANTON THOMAS R reported acquisition or exercise transactions in this Form 4 filing.
ADTRAN Holdings, Inc. Chairman & CEO Stanton R. Thomas reported a compensation-related equity award, not an open-market trade. He received 170,723 shares of Common Stock as a grant of restricted stock units. These units vest in four equal annual installments beginning on the first anniversary of the grant date. Following this award, Thomas directly holds 1,126,553.51 shares of ADTRAN common stock.
ADTRAN Holdings is asking stockholders to vote at its virtual 2026 annual meeting on May 13, 2026. The board recommends electing six directors, approving a Delaware charter amendment to extend limited liability protections to certain officers, holding an advisory vote on executive pay, and ratifying PricewaterhouseCoopers LLP as auditor for 2026.
The company highlights 2025 performance, with revenue of $1,083.8 million, up 17.5% from 2024, and GAAP gross margin improving to 38.3% (non‑GAAP 42.1%). As of March 16, 2026, there were 80,698,206 common shares outstanding. Major holders include The Vanguard Group (10.1%), BlackRock (8.2%) and EGORA Ventures (6.6%).
The proxy details board structure, committee independence, cybersecurity oversight and sustainability efforts, as well as a pay program that ties senior executive compensation to financial results and three‑year relative total shareholder return.
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.
ADTRAN Holdings SVP of Finance and CFO Timothy P. Santo reported a routine tax-withholding share transfer. On the transaction date, 1,501 shares of common stock were delivered to ADTRAN Holdings at a price of $11.90 per share to cover withholding taxes on vesting restricted stock units. After this non-market disposition, Santo directly holds 25,093 shares of ADTRAN Holdings common stock.
EGORA Ventures filed an amended Schedule 13G/A reporting ownership of 4,005,806 shares of ADTRAN Holdings, Inc. The filing states this equals 4.9745% of the class. The disclosure shows EGORA holds sole voting and dispositive power over 4,005,806 shares.
The cover lists 02/02/2026 and the signature block is dated 03/18/2026 (signed by Managing Director Nikolaus Zwick). The filing is an ownership disclosure under Schedule 13G/A and does not state plans to acquire or dispose of additional shares.
ADTRAN Holdings, Inc. is soliciting proxies for its 2026 Annual Meeting of Stockholders to be held virtually on May 13, 2026. Stockholders of record as of March 16, 2026 may vote on four proposals: election of six directors, an amendment to the Certificate of Incorporation, an advisory vote on NEO compensation, and ratification of PwC as auditor.
The Board recommends voting FOR each proposal. Materials and voting instructions are available at https://materials.proxyvote.com/00486H. The Proxy Statement also highlights corporate governance practices, committee charters, cybersecurity and sustainability oversight, director independence and equity ownership guidelines. The Company reported $1,083.8 million in 2025 revenue, a 17.5% increase from 2024, and describes product and customer wins across optical networking, access/aggregation and subscriber solutions.
ADTRAN Holdings, Inc. director Jacqueline Hourigan Rice reported an open-market sale of Common Stock. She sold 14,406 shares on March 4, 2026 at a weighted average price of $10.29 per share, with individual sale prices ranging from $10.24 to $10.37.
After this sale, she directly held 13,809 shares of Common Stock. In addition, a separate line in the filing shows 62,281 shares of Common Stock held indirectly, listed under ownership "As Trustee."
ADTRAN Holdings, Inc. Chairman & CEO Stanton R. Stanton reported an amended insider transaction. On January 24, 2025, he acquired 39,735 shares of common stock as a grant or award at a stated price of $0.0000 per share, bringing his directly held shares to 815,952.51.
A prior Form 4 filing understated by 360 shares the number of shares received from performance stock units granted on March 1, 2023 under the company’s 2020 Employee Stock Incentive Plan. As a result of this correction, he beneficially owns 955,830.51 shares as of the date referenced.
Morgan Stanley Smith Barney LLC filed a Form 144 reporting a proposed sale of 148,266.55 shares of common stock of ADTN on 03/04/2026. The shares are described as restricted stock vesting under a registered plan with a vesting/service date of 12/31/2025.