As of April 22, 2026, the three largest insider holders of XTNT are Stavros G. Vizirgianakis (Director, 7.52Mn shares), Stavros G. Vizirgianakis (Director, 6.00Mn shares), Sean E Browne (President And Ceo, 2.58Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Stavros G. Vizirgianakis | - | 7,515,570 | 0 | 18 Nov, 2025 |
| Stavros G. Vizirgianakis | - | 5,995,355 | 0 | 17 Nov, 2022 |
| Sean E Browne | President And Ceo | 2,575,274 | 0 | 18 Nov, 2025 |
| Sean E Browne | President And Ceo | 1,506,584 | 0 | 20 Oct, 2022 |
| Kevin D Brandt | Chief Commercial Officer | 943,736 | 0 | 19 Aug, 2024 |
| John K Bakewell | - | 914,116 | 0 | 18 Nov, 2025 |
| Scott C Neils | Cfo And Assistant Secretary | 843,381 | 0 | 16 Jan, 2026 |
| Robert Mcnamara | - | 754,151 | 0 | 19 Aug, 2024 |
| Kevin D Brandt | Chief Commercial Officer | 703,571 | 0 | 17 Aug, 2022 |
| Mark A. Schallenberger | Chief Operating Officer | 663,157 | 0 | 18 Feb, 2026 |
| Jonn R. Beeson | - | 517,619 | 0 | 18 Nov, 2025 |
| John K Bakewell | - | 448,546 | 0 | 17 Aug, 2022 |
| Jeffrey J Peters | - | 448,546 | 0 | 17 Aug, 2022 |
| Robert Mcnamara | - | 446,809 | 0 | 17 Aug, 2022 |
| Scott C Neils | Chief Financial Officer | 403,960 | 0 | 19 Jan, 2023 |
| Lori D Mitchell-Keller | - | 353,124 | 0 | 19 Aug, 2024 |
| Greg Jensen | Vice President, Finance Cfo | 285,331 | 0 | 17 Aug, 2021 |
| Michael Eggenberg | - | 215,415 | 0 | 17 Aug, 2022 |
| Matthew Rizzo | - | 215,415 | 0 | 17 Aug, 2022 |
| Advisors Llc Orbimed | - | 0 | 215,415 | 17 Aug, 2022 |
| Abhinav Jain | - | 158,228 | 0 | 18 Nov, 2025 |
| Tyler Lipschultz | - | 158,228 | 0 | 18 Nov, 2025 |
| Matthew Rizzo | - | 120,549 | 0 | 17 Aug, 2021 |
| Michael Eggenberg | - | 120,549 | 0 | 17 Aug, 2021 |
| Advisors Llc Orbimed | - | 0 | 120,549 | 17 Aug, 2021 |
| Mark A. Schallenberger | Chief Operations Officer | 89,000 | 0 | 17 Feb, 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Feb, 2026 | Mark A. Schallenberger | Common Stock | D | 7,709 | $0.58 | 663,157 | D | F |
| 15 Jan, 2026 | Scott C Neils | Common Stock | D | 8,084 | $0.65 | 843,381 | D | F |
| 15 Nov, 2025 | Scott C Neils | Common Stock | A | 263,291 | $0.00 | 851,465 | D | A |
| 15 Nov, 2025 | Abhinav Jain | Common Stock | A | 158,228 | $0.00 | 158,228 | D | A |
| 15 Nov, 2025 | Sean E Browne | Common Stock | A | 394,937 | $0.00 | 2,575,274 | D | A |
| 15 Nov, 2025 | Tyler Lipschultz | Common Stock | A | 158,228 | $0.00 | 158,228 | D | A |
| 15 Nov, 2025 | John K Bakewell | Common Stock | A | 158,228 | $0.00 | 158,228 | D | A |
| 15 Nov, 2025 | John K Bakewell | Common Stock | A | 158,228 | $0.00 | 914,116 | D | A |
| 15 Nov, 2025 | Jonn R. Beeson | Common Stock | A | 158,228 | $0.00 | 517,619 | D | A |
| 15 Nov, 2025 | Stavros G. Vizirgianakis | Common Stock | A | 553,797 | $0.00 | 7,515,570 | D | A |
| 15 Nov, 2025 | Mark A. Schallenberger | Common Stock | A | 292,253 | $0.00 | 670,866 | D | A |
| 15 Nov, 2025 | Scott C Neils | Performance Stock Units (PSUs) | A | 526,582 | $0.00 | 526,582 | D | A |
| 15 Nov, 2025 | Sean E Browne | Performance Stock Units (PSUs) | A | 789,874 | $0.00 | 789,874 | D | A |
| 15 Nov, 2025 | Mark A. Schallenberger | Performance Stock Units (PSUs) | A | 584,506 | $0.00 | 584,506 | D | A |
| 15 Aug, 2025 | Sean E Browne | Common Stock | D | 10,605 | $0.63 | 2,180,337 | D | F |
| 15 Aug, 2025 | Scott C Neils | Common Stock | D | 34,131 | $0.63 | 588,174 | D | F |
| 10 Apr, 2025 | Advisors Llc Orbimed | Common Stock | D | 56,004,974 | $0.42 | 0 | I | S |
| 10 Apr, 2025 | Advisors Llc Orbimed | Common Stock | D | 17,109,618 | $0.42 | 0 | I | S |
| 15 Jan, 2025 | Scott C Neils | Common Stock | D | 7,986 | $0.53 | 622,305 | D | F |
| 15 Oct, 2024 | Sean E Browne | Common Stock | D | 105,442 | $0.59 | 2,190,942 | D | F |