ADTRAN Holdings's three largest insider shareholders as of September 05, 2026 are Thomas R Stanton (Chairman Ceo, 1.13Mn shares), Thomas R Stanton (Chairman Ceo, 1.13Mn shares), Brian Protiva (Ceo Of Adva, 253.55K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Thomas R Stanton | Chairman Ceo | 1,126,554 | 0 | 1,126,554 | 49.6% | 03 Apr, 2026 |
| 2 | Brian Protiva | Ceo Of Adva | 253,545 | 0 | 253,545 | 11.2% | 03 Jan, 2024 |
| 3 | James Denson Jr Wilson | Chief Revenue Officer | 132,808 | 0 | 132,808 | 5.9% | 22 May, 2026 |
| 4 | H Fenwick Huss | Director | 107,600 | 0 | 107,600 | 4.7% | 05 Jan, 2026 |
| 5 | Michael Foliano | Chief Financial Officer | 106,986 | 0 | 106,986 | 4.7% | 04 Jan, 2023 |
| 6 | Kathryn A Walker | Director | 98,663 | 0 | 98,663 | 4.3% | 05 Jan, 2026 |
| 7 | Christoph Glingener | Chief Technology Officer | 83,953 | 0 | 83,953 | 3.7% | 10 Aug, 2026 |
| 8 | Gregory James Mccray | Director | 72,893 | 0 | 72,893 | 3.2% | 05 Jan, 2026 |
| 9 | Nikos Theodosopoulos | Director | 65,963 | 0 | 65,963 | 2.9% | 05 Jan, 2026 |
| 10 | Roy J Nichols | Director | 63,870 | 0 | 63,870 | 2.8% | 07 Sep, 2021 |
| 11 | Timothy P Santo | Svp Of Finance; Cfo | 59,924 | 0 | 59,924 | 2.6% | 07 Aug, 2026 |
| 12 | Ulrich Dopfer | Chief Financial Officer | 48,195 | 0 | 48,195 | 2.1% | 28 Jan, 2025 |
| 13 | Eduard Scheiterer | Svp, Research Development | 40,027 | 0 | 40,027 | 1.8% | 02 Dec, 2021 |
| 14 | Johanna Hey | Director | 8,294 | 0 | 8,294 | 0.4% | 21 Sep, 2023 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 10 Aug, 2026 | Christoph Glingener | Chief Technology Officer | Acquired A | 27,924 | $0.00 | $0 | 83,953 | Direct |
| 06 Aug, 2026 | Timothy P Santo | Svp Of Finance; Cfo | Acquired P | 6,579 | $7.60 | $50.00K | 59,924 | Direct |
| 20 May, 2026 | James Denson Jr Wilson | Chief Revenue Officer | Disposed S | 9,332 | $14.72 | $137.37K | 143,277 | Direct |
| 20 May, 2026 | James Denson Jr Wilson | Chief Revenue Officer | Disposed G | 10,469 | $0.00 | $0 | 132,808 | Direct |
| 07 May, 2026 | Christoph Glingener | Chief Technology Officer | Acquired M | 41,220 | $7.01 | $288.95K | 87,865 | Direct |
| 07 May, 2026 | Christoph Glingener | Chief Technology Officer | Disposed S | 41,220 | $14.73 | $607.17K | 46,645 | Direct |
| 07 May, 2026 | Christoph Glingener | Chief Technology Officer | Acquired M | 84,895 | $12.17 | $1.03Mn | 131,540 | Direct |
| 07 May, 2026 | Christoph Glingener | Chief Technology Officer | Disposed S | 84,895 | $15.06 | $1.28Mn | 46,645 | Direct |
| 08 May, 2026 | Christoph Glingener | Chief Technology Officer | Acquired M | 22,277 | $12.17 | $271.11K | 68,922 | Direct |
| 08 May, 2026 | Christoph Glingener | Chief Technology Officer | Disposed S | 22,277 | $15.00 | $334.16K | 46,645 | Direct |
| 07 May, 2026 | Christoph Glingener | Chief Technology Officer | Disposed M | 41,220 | $0.00 | $0 | 0 | Direct |
| 07 May, 2026 | Christoph Glingener | Chief Technology Officer | Disposed M | 84,895 | $0.00 | $0 | 22,277 | Direct |
| 08 May, 2026 | Christoph Glingener | Chief Technology Officer | Disposed M | 22,277 | $0.00 | $0 | 0 | Direct |
| 01 Apr, 2026 | Timothy P Santo | Svp Of Finance; Cfo | Acquired A | 28,252 | $0.00 | $0 | 53,345 | Direct |
| 01 Apr, 2026 | Thomas R Stanton | Chairman Ceo | Acquired A | 170,723 | $0.00 | $0 | 1,126,554 | Direct |
| 01 Apr, 2026 | Timothy P Santo | Svp Of Finance; Cfo | Acquired A | 28,252 | $0.00 | $0 | 53,345 | Direct |
| 01 Apr, 2026 | Thomas R Stanton | Chairman Ceo | Acquired A | 170,723 | $0.00 | $0 | 1,126,554 | Direct |
| 01 Apr, 2026 | Thomas R Stanton | Chairman Ceo | Acquired A | 170,723 | $0.00 | $0 | 1,126,554 | Direct |
| 01 Apr, 2026 | Timothy P Santo | Svp Of Finance; Cfo | Acquired A | 28,252 | $0.00 | $0 | 53,345 | Direct |
| 01 Apr, 2026 | James Denson Jr Wilson | Chief Revenue Officer | Acquired A | 24,908 | $0.00 | $0 | 152,609 | Direct |