🕵️ Adtran Holdings, Inc. ($ADTN)
SEC insider & ownership activity, last 12 months · CIK 926282 · every row links its SEC filing
Over the last 12 months insiders sold $2.5M against $450K of open-market buying. Christoph Glingener sold $2.2M through a 10b5-1 trading plan in 3 lots (May). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
3 buyers, $450K (3 lots) · 3 sellers, $2.5M (5 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Christoph Glingener | 0 | – | 3 | $2.2M | May 8, 2026 |
| Thomas R. Stanton | 1 | $300K | 0 | – | Nov 24, 2025 |
| Jacqueline H Rice | 0 | – | 1 | $148K | Mar 4, 2026 |
| James D Wilson Jr. | 0 | – | 1 | $137K | May 20, 2026 |
| Theodosopoulos Nikos | 1 | $100K | 0 | – | Nov 26, 2025 |
| Timothy P. Santo | 1 | $49K | 0 | – | Nov 28, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Vanguard Portfolio Management | 6.0% | 13G | Apr 28, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| James D Wilson Jr. | $137K | May 20, 2026 | filing ↗ |
| Christoph Glingener | $2.3M | May 7, 2026 | filing ↗ |
| Jacqueline H Rice | $148K | Mar 4, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Material agreement (1.01) | Jul 21, 2026 | filing ↗ |
| Agreement terminated (1.02) | Jul 21, 2026 | filing ↗ |
| New financial obligation (2.03) | Jul 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 21, 2026 | filing ↗ |
| Earnings (2.02) | Jul 21, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jul 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 21, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 23, 2026 | filing ↗ |
| Other events (8.01) | Jun 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 23, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | May 13, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 13, 2026 | filing ↗ |
| Earnings (2.02) | May 4, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 4, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 1, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 1, 2026 | filing ↗ |
| Earnings (2.02) | Feb 25, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 25, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 25, 2026 | filing ↗ |
| Earnings (2.02) | Jan 21, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 21, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 21, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 9, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 9, 2025 | filing ↗ |
| Earnings (2.02) | Nov 3, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 3, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 3, 2025 | filing ↗ |
| Material agreement (1.01) | Sep 19, 2025 | filing ↗ |