ATEC's three largest insider shareholders as of March 23, 2026 are Healthcare Partners, Llc L-5 (TenPercentOwner, 11.08Mn shares), Jennifer N. Pritzker (TenPercentOwner, 10.65Mn shares), Capital Holdings Llc Squadron (TenPercentOwner, 10.65Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Healthcare Partners, Llc L-5 | 11,081,538 | 0 | 12 May, 2023 | |
| Jennifer N. Pritzker | 0 | 10,645,045 | 10 Dec, 2025 | |
| Capital Llc Squadron | 10,645,045 | 0 | 09 Dec, 2025 | |
| Capital Holdings Llc Squadron | 0 | 10,645,045 | 10 Dec, 2025 | |
| David R Pelizzon | 0 | 10,395,045 | 18 Dec, 2025 | |
| Patrick Miles | Ceo | 5,778,551 | 0 | 08 Mar, 2026 |
| Ward W Jr Woods | 0 | 2,056,311 | 08 Mar, 2023 | |
| Craig E Hunsaker | Evp, People Culture | 1,725,609 | 0 | 10 Mar, 2026 |
| Evan Bakst | 1,105,785 | 0 | 14 Jun, 2024 | |
| Scott Lish | Chief Operating Officer | 815,704 | 0 | 17 Mar, 2026 |
| James L L Tullis | 171,962 | 563,831 | 12 Sep, 2023 | |
| Brian Snider | Evp, Marketing | 655,382 | 0 | 08 Aug, 2022 |
| Mortimer Iii Berkowitz | 618,050 | 0 | 11 Sep, 2025 | |
| Mortimer Iii Berkowitz | 0 | 611,102 | 09 Mar, 2023 | |
| John Todd Koning | Chief Financial Officer | 600,721 | 0 | 17 Mar, 2026 |
| Quentin S. Blackford | 568,369 | 0 | 13 Jun, 2025 | |
| Tyson Eliot Marshall | General Counsel Corp. Sec. | 559,459 | 0 | 08 Mar, 2026 |
| Kelli Mari Howell | Evp, Clinical Strategies | 540,098 | 0 | 09 Aug, 2022 |
| David Sponsel | Evp, Sales | 504,932 | 0 | 12 Mar, 2026 |
| David M Demski | 399,623 | 0 | 12 Dec, 2025 | |
| Jeffrey P Rydin | 385,441 | 0 | 05 Nov, 2025 | |
| David R Pelizzon | 346,827 | 0 | 13 Jun, 2025 | |
| Ward W Jr Woods | 154,291 | 0 | 13 Jun, 2025 | |
| Donald Allen Williams | 134,728 | 0 | 18 Jun, 2021 | |
| Paul Segal | 100,000 | 0 | 14 Jun, 2023 | |
| Keith Valentine | 97,271 | 0 | 13 Jun, 2025 | |
| David H Mowry | 92,381 | 0 | 12 Sep, 2023 | |
| Jason Hochberg | 84,375 | 0 | 16 Dec, 2021 | |
| Karen K Mcginnis | 68,709 | 0 | 13 Jun, 2025 | |
| Marie Meynadier | 59,126 | 0 | 21 Jun, 2023 | |
| Jennifer N. Pritzker | 58,000 | 0 | 10 Aug, 2023 | |
| Evan Bakst | 0 | 50,000 | 26 Aug, 2024 | |
| Elizabeth Ann Altman | 41,066 | 0 | 21 Jun, 2023 | |
| Andy Barnett | 18,546 | 0 | 16 Jun, 2022 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 13 Mar, 2026 | Scott Lish | Common Stock | D | 260,535 | $12.30 | 815,704 | D | S |
| 13 Mar, 2026 | John Todd Koning | Common Stock | D | 79,789 | $12.36 | 600,721 | D | S |
| 11 Mar, 2026 | David Sponsel | Common Stock | D | 163,452 | $12.52 | 504,932 | D | S |
| 06 Mar, 2026 | Craig E Hunsaker | Common Stock | D | 33,602 | $12.22 | 1,808,974 | D | S |
| 09 Mar, 2026 | Craig E Hunsaker | Common Stock | D | 82,765 | $12.45 | 1,726,209 | D | S |
| 09 Mar, 2026 | Craig E Hunsaker | Common Stock | D | 600 | $0.00 | 1,725,609 | D | G |
| 05 Mar, 2026 | Patrick Miles | Common Stock | D | 219,749 | $12.57 | 5,778,551 | D | F |
| 05 Mar, 2026 | John Todd Koning | Common Stock | D | 68,910 | $12.57 | 680,510 | D | F |
| 05 Mar, 2026 | Tyson Eliot Marshall | Common Stock | D | 88,835 | $12.49 | 559,459 | D | S |
| 25 Feb, 2026 | Patrick Miles | Common Stock | A | 611,673 | $0.00 | 5,643,680 | D | A |
| 25 Feb, 2026 | David Sponsel | Common Stock | A | 205,094 | $0.00 | 554,594 | D | A |
| 25 Feb, 2026 | Tyson Eliot Marshall | Common Stock | A | 205,094 | $0.00 | 550,536 | D | A |
| 25 Feb, 2026 | Craig E Hunsaker | Common Stock | A | 311,110 | $0.00 | 1,694,206 | D | A |
| 25 Feb, 2026 | Scott Lish | Common Stock | A | 311,110 | $0.00 | 927,869 | D | A |
| 25 Feb, 2026 | John Todd Koning | Common Stock | A | 205,094 | $0.00 | 618,646 | D | A |
| 25 Feb, 2026 | David Sponsel | Common Stock | A | 93,410 | $0.00 | 648,004 | D | A |
| 25 Feb, 2026 | Tyson Eliot Marshall | Common Stock | A | 84,918 | $0.00 | 635,454 | D | A |
| 25 Feb, 2026 | John Todd Koning | Common Stock | A | 110,394 | $0.00 | 729,040 | D | A |
| 25 Feb, 2026 | Patrick Miles | Common Stock | A | 305,707 | $0.00 | 5,949,387 | D | A |
| 25 Feb, 2026 | Scott Lish | Common Stock | A | 127,378 | $0.00 | 1,055,247 | D | A |