ADTRAN Holdings, Inc. (ADTN) ownership: Top institutional holder: BlackRock, Inc. ($98.63M). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock, Inc. | 7840254.00 | $98.63M | 2026-03-31 |
| VANGUARD GROUP INC | 8188496.00 | $71.16M | 2025-12-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4771452.00 | $60.02M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3426230.00 | $43.10M | 2026-03-31 |
| ROYCE & ASSOCIATES LP | 3127403.00 | $39.34M | 2026-03-31 |
| DNB Asset Management AS | 3123679.00 | $39.30M | 2026-03-31 |
| STATE STREET CORP | 2350737.00 | $29.57M | 2026-03-31 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 1989530.00 | $25.03M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-20 | |
| Sell | null | 2026-05-20 | |
| Sell | null | 2026-05-20 | |
| Sell | null | 2026-05-20 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-08 | |
| Sell | null | 2026-05-07 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.