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ADTRAN HOLDINGS INC (ADTN)

Institutional ownership, SEC filings and insider activity

Sector: Technology · SEC CIK 0000926282 · EDGAR filings · Updated 2026-07-28

ADTRAN HOLDINGS INC (ADTN) has reported institutional ownership of 96.9%, with 226 institutional managers holding positions valued at $987.2M per the latest 13F reporting period. SEC filings include an active non-reliance notice on previously issued financial statements (8-K Item 4.02), notice of delisting or failure to satisfy a continued listing rule (8-K Item 3.01).

Filings this week (3)

• 2026-07-28 — Insider transaction reported (Form 4)
• 2026-07-23 — Current report (8-K) filed
• 2026-07-22 — Current report (8-K) filed

Every filing links to the official SEC document. Real-time filing alerts for this company are available inside the app.

Latest updates

• 2026-07-17 — S-3ASR filed
• 2026-07-06 — Insider transaction reported (Form 4)
• 2026-07-01 — Initial insider ownership filed (Form 3)

Institutional ownership overview

According to SEC 13F filings tracked by Sightfile, ADTRAN HOLDINGS INC has 226 institutional holders and institutional ownership of 96.9%.

Insider activity

Insiders reported 27 transactions (3 buys, 1 sells) across 9 reporting insiders, with a net reported value of $301.5K.

Data flags from SEC filings

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