As of September 29, 2026, ATN International's top three insider holders are Cornelius B Jr Prior (Chairman, 3.98Mn shares), Michael T Prior (Chairman And Ceo, 587.67K shares), Brad W Martin (Chief Executive Officer, 126.13K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Michael T Prior | Chairman And Ceo | 587,673 | 0 | 587,673 | 49.0% | 27 Mar, 2026 |
| 2 | Brad W Martin | Chief Executive Officer | 126,129 | 0 | 126,129 | 10.5% | 27 Mar, 2026 |
| 3 | Justin D Benincasa | Cfo | 68,135 | 0 | 68,135 | 5.7% | 27 Mar, 2024 |
| 4 | Mary Mabey | Svp And General Counsel | 60,402 | 0 | 60,402 | 5.0% | 11 Aug, 2026 |
| 5 | Carlos Doglioli | Chief Financial Officer | 50,449 | 0 | 50,449 | 4.2% | 19 Mar, 2026 |
| 6 | Justin M Leon | Svp, Corporate Development | 49,707 | 0 | 49,707 | 4.1% | 27 Mar, 2026 |
| 7 | Pamela F Lenehan | Director | 38,086 | 0 | 38,086 | 3.2% | 17 Jun, 2026 |
| 8 | Bernard J Bulkin | Director | 37,217 | 0 | 37,217 | 3.1% | 18 Jun, 2026 |
| 9 | Naji Khoury | Ceo | 36,853 | 0 | 36,853 | 3.1% | 28 Apr, 2026 |
| 10 | Cornelius B Jr Prior | TenPercentOwner | 0 | 30,041 | 30,041 | 2.5% | 04 Sep, 2026 |
| 11 | April Henry | Director | 26,338 | 0 | 26,338 | 2.2% | 18 Jun, 2026 |
| 12 | Richard J Ganong | Director | 23,787 | 0 | 23,787 | 2.0% | 20 Jun, 2024 |
| 13 | Liane J Pelletier | Director | 20,816 | 0 | 20,816 | 1.7% | 08 Jun, 2022 |
| 14 | Patricia Jacobs | Director | 19,958 | 0 | 19,958 | 1.7% | 02 Sep, 2026 |
| 15 | Derek Hudson | Director | 15,721 | 0 | 15,721 | 1.3% | 17 Jun, 2026 |
| 16 | James S Eisenstein | Director | 8,982 | 0 | 8,982 | 0.7% | 07 Jun, 2022 |
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 |
|---|---|---|---|---|---|---|---|---|
| 07 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 4,500 | $31.03 | $139.64K | 25,541 | Indirect |
| 21 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 5,367 | $31.32 | $168.09K | 20,174 | Indirect |
| 04 Sep, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed G | 12,500 | $0.00 | $0 | 3,969,803 | Direct |
| 02 Sep, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 2,582 | $31.12 | $80.35K | 34,583 | Indirect |
| 03 Sep, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 4,542 | $31.02 | $140.88K | 30,041 | Indirect |
| 31 Aug, 2026 | Patricia Jacobs | Director | Disposed S | 1,500 | $30.04 | $45.06K | 19,958 | Direct |
| 24 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 10,000 | $31.34 | $313.39K | 37,165 | Indirect |
| 20 Aug, 2026 | Patricia Jacobs | Director | Disposed S | 1,000 | $31.14 | $31.14K | 21,458 | Direct |
| 19 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 10,000 | $31.86 | $318.62K | 47,665 | Indirect |
| 20 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 500 | $31.25 | $15.63K | 47,165 | Indirect |
| 17 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 5,745 | $31.79 | $182.65K | 58,665 | Indirect |
| 18 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 1,000 | $31.75 | $31.75K | 57,665 | Indirect |
| 13 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 2,500 | $32.05 | $80.13K | 64,436 | Indirect |
| 14 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 26 | $32.10 | $835 | 64,410 | Indirect |
| 10 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed G | 12,000 | $0.00 | $0 | 3,982,303 | Direct |
| 10 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 6,500 | $32.49 | $211.21K | 67,436 | Indirect |
| 10 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 500 | $33.25 | $16.63K | 66,936 | Indirect |
| 10 Aug, 2026 | Mary Mabey | Svp And General Counsel | Disposed S | 5,000 | $32.13 | $160.63K | 60,402 | Direct |
| 06 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 500 | $28.76 | $14.38K | 80,936 | Indirect |
| 06 Aug, 2026 | Cornelius B Jr Prior | TenPercentOwner | Disposed S | 500 | $30.50 | $15.25K | 80,436 | Indirect |