ATNI's three largest insider shareholders as of May 14, 2026 are Cornelius B Jr Prior (Chairman, 4.17Mn shares), Michael T Prior (Chairman And Ceo, 587.67K shares), Michael T Prior (Chairman And Ceo, 587.67K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Cornelius B Jr Prior | Chairman | 4,174,303 | 0 | 20 Apr, 2026 |
| Michael T Prior | Chairman And Ceo | 587,673 | 0 | 27 Mar, 2026 |
| Michael T Prior | Chairman And Ceo | 587,673 | 0 | 27 Mar, 2026 |
| Brad W Martin | Chief Executive Officer | 126,129 | 0 | 27 Mar, 2026 |
| Brad W Martin | Chief Executive Officer | 126,129 | 0 | 27 Mar, 2026 |
| Justin D Benincasa | Cfo | 68,135 | 0 | 27 Mar, 2024 |
| Justin D Benincasa | Cfo | 68,135 | 0 | 27 Mar, 2024 |
| Mary Mabey | Svp And General Counsel | 65,402 | 0 | 27 Mar, 2026 |
| Mary Mabey | Svp And General Counsel | 65,402 | 0 | 27 Mar, 2026 |
| Carlos Doglioli | Chief Financial Officer | 50,449 | 0 | 19 Mar, 2026 |
| Carlos Doglioli | Chief Financial Officer | 50,449 | 0 | 19 Mar, 2026 |
| Justin M Leon | Svp, Corporate Development | 49,707 | 0 | 27 Mar, 2026 |
| Justin M Leon | Svp, Corporate Development | 49,707 | 0 | 27 Mar, 2026 |
| Pamela F Lenehan | - | 33,298 | 0 | 20 Jun, 2025 |
| Bernard J Bulkin | - | 32,429 | 0 | 20 Jun, 2025 |
| Bernard J Bulkin | - | 32,429 | 0 | 20 Jun, 2025 |
| Cornelius B Jr Prior | - | 0 | 32,232 | 10 Nov, 2021 |
| Cornelius B Jr Prior | - | 0 | 32,232 | 10 Nov, 2021 |
| Richard J Ganong | - | 23,787 | 0 | 20 Jun, 2024 |
| Richard J Ganong | - | 23,787 | 0 | 20 Jun, 2024 |
| April Henry | - | 21,550 | 0 | 20 Jun, 2025 |
| April Henry | - | 21,550 | 0 | 20 Jun, 2025 |
| Liane J Pelletier | - | 20,816 | 0 | 08 Jun, 2022 |
| Patricia Jacobs | - | 17,670 | 0 | 20 Jun, 2025 |
| Patricia Jacobs | - | 17,670 | 0 | 20 Jun, 2025 |
| Derek Hudson | - | 12,369 | 0 | 20 Jun, 2025 |
| Derek Hudson | - | 12,369 | 0 | 20 Jun, 2025 |
| James S Eisenstein | - | 8,982 | 0 | 07 Jun, 2022 |
| James S Eisenstein | - | 8,982 | 0 | 07 Jun, 2022 |
| Pamela F Lenehan | - | 0 | 1,500 | 21 Nov, 2023 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 17 Apr, 2026 | Cornelius B Jr Prior | Common Stock | D | 1,700 | $0.00 | 4,174,303 | D | G |
| 17 Mar, 2026 | Michael T Prior | Common Stock | A | 13,524 | $0.00 | 590,051 | D | A |
| 25 Mar, 2026 | Brad W Martin | Common Stock | D | 1,237 | $27.92 | 126,129 | D | F |
| 12 Mar, 2026 | Michael T Prior | Common Stock | D | 2,191 | $24.65 | 581,213 | D | F |
| 25 Mar, 2026 | Brad W Martin | Common Stock | D | 1,237 | $27.92 | 126,129 | D | F |
| 25 Mar, 2026 | Mary Mabey | Common Stock | D | 875 | $27.92 | 65,402 | D | F |
| 25 Mar, 2026 | Michael T Prior | Common Stock | D | 2,378 | $27.92 | 587,673 | D | F |
| 07 Mar, 2026 | Michael T Prior | Common Stock | A | 14,500 | - | 592,816 | D | M |
| 12 Mar, 2026 | Michael T Prior | Common Stock | D | 2,191 | $24.65 | 581,213 | D | F |
| 25 Mar, 2026 | Michael T Prior | Common Stock | D | 2,378 | $27.92 | 587,673 | D | F |
| 25 Mar, 2026 | Justin M Leon | Common Stock | D | 560 | $27.92 | 49,707 | D | F |
| 25 Mar, 2026 | Justin M Leon | Common Stock | D | 560 | $27.92 | 49,707 | D | F |
| 17 Mar, 2026 | Michael T Prior | Common Stock | A | 13,524 | $0.00 | 590,051 | D | A |
| 25 Mar, 2026 | Mary Mabey | Common Stock | D | 875 | $27.92 | 65,402 | D | F |
| 07 Mar, 2026 | Michael T Prior | Common Stock | A | 14,500 | - | 592,816 | D | M |
| 07 Mar, 2026 | Michael T Prior | Common Stock | D | 6,430 | $24.18 | 586,386 | D | F |
| 13 Mar, 2026 | Michael T Prior | Common Stock | D | 4,686 | $24.49 | 576,527 | D | F |
| 13 Mar, 2026 | Michael T Prior | Common Stock | D | 4,686 | $24.49 | 576,527 | D | F |
| 07 Mar, 2026 | Michael T Prior | Common Stock | D | 6,430 | $24.18 | 586,386 | D | F |
| 07 Mar, 2026 | Michael T Prior | Common Stock | D | 2,982 | $24.18 | 583,404 | D | F |