XTNT's three largest insider shareholders as of September 29, 2026 are Stavros G. Vizirgianakis (Director, 7.84Mn shares), Stavros G. Vizirgianakis (Director, 6.00Mn shares), Sean E Browne (President And Ceo, 3.11Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Stavros G. Vizirgianakis | Director | 13,834,200 | 0 | 13,834,200 | 48.3% | 18 Aug, 2026 |
| 2 | Sean E Browne | President And Ceo | 4,621,253 | 0 | 4,621,253 | 16.1% | 18 Aug, 2026 |
| 3 | Kevin D Brandt | Chief Commercial Officer | 1,647,307 | 0 | 1,647,307 | 5.8% | 19 Aug, 2024 |
| 4 | Scott C Neils | Cfo And Assistant Secretary | 1,619,186 | 0 | 1,619,186 | 5.7% | 18 Aug, 2026 |
| 5 | John K Bakewell | Director | 1,578,179 | 0 | 1,578,179 | 5.5% | 18 Aug, 2026 |
| 6 | Robert Mcnamara | Director | 1,200,960 | 0 | 1,200,960 | 4.2% | 19 Aug, 2024 |
| 7 | Mark A. Schallenberger | Chief Operating Officer | 1,195,087 | 0 | 1,195,087 | 4.2% | 18 Aug, 2026 |
| 8 | Jonn R. Beeson | Director | 733,136 | 0 | 733,136 | 2.6% | 18 Aug, 2026 |
| 9 | Jeffrey J Peters | Director | 448,546 | 0 | 448,546 | 1.6% | 17 Aug, 2022 |
| 10 | Abhinav Jain | Director | 373,745 | 0 | 373,745 | 1.3% | 18 Aug, 2026 |
| 11 | Tyler Lipschultz | Director | 373,745 | 0 | 373,745 | 1.3% | 18 Aug, 2026 |
| 12 | Lori D Mitchell-Keller | Director | 353,124 | 0 | 353,124 | 1.2% | 19 Aug, 2024 |
| 13 | Michael Eggenberg | Director, TenPercentOwner | 215,415 | 0 | 215,415 | 0.8% | 17 Aug, 2022 |
| 14 | Matthew Rizzo | Director, TenPercentOwner | 215,415 | 0 | 215,415 | 0.8% | 17 Aug, 2022 |
| 15 | Advisors Llc Orbimed | Director, TenPercentOwner | 0 | 215,415 | 215,415 | 0.8% | 17 Aug, 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 |
|---|---|---|---|---|---|---|---|---|
| 15 Aug, 2026 | Jonn R. Beeson | Director | Acquired A | 215,517 | $0.00 | $0 | 733,136 | Direct |
| 15 Aug, 2026 | Abhinav Jain | Director | Acquired A | 215,517 | $0.00 | $0 | 373,745 | Direct |
| 15 Aug, 2026 | Stavros G. Vizirgianakis | Director | Acquired A | 323,275 | $0.00 | $0 | 7,838,845 | Direct |
| 15 Aug, 2026 | Tyler Lipschultz | Director | Acquired A | 215,517 | $0.00 | $0 | 373,745 | Direct |
| 15 Aug, 2026 | John K Bakewell | Director | Acquired A | 215,517 | $0.00 | $0 | 1,129,633 | Direct |
| 15 Aug, 2026 | Scott C Neils | Cfo And Assistant Secretary | Acquired A | 400,000 | $0.00 | $0 | 1,243,381 | Direct |
| 15 Aug, 2026 | Mark A. Schallenberger | Chief Operating Officer | Acquired A | 450,000 | $0.00 | $0 | 1,113,157 | Direct |
| 15 Aug, 2026 | Sean E Browne | President And Ceo | Acquired A | 550,000 | $0.00 | $0 | 3,125,274 | Direct |
| 15 Aug, 2026 | Scott C Neils | Cfo And Assistant Secretary | Disposed F | 28,155 | $0.31 | $8.73K | 1,215,226 | Direct |
| 15 Aug, 2026 | Sean E Browne | President And Ceo | Disposed F | 10,605 | $0.31 | $3.29K | 3,114,669 | Direct |
| 15 Aug, 2026 | Mark A. Schallenberger | Chief Operating Officer | Disposed F | 7,070 | $0.31 | $2.19K | 1,106,087 | Direct |
| 15 Feb, 2026 | Mark A. Schallenberger | Chief Operating Officer | Disposed F | 7,709 | $0.58 | $4.47K | 663,157 | Direct |
| 15 Jan, 2026 | Scott C Neils | Cfo And Assistant Secretary | Disposed F | 8,084 | $0.65 | $5.25K | 843,381 | Direct |
| 15 Nov, 2025 | John K Bakewell | Director | Acquired A | 158,228 | $0.00 | $0 | 914,116 | Direct |
| 15 Nov, 2025 | Scott C Neils | Cfo And Assistant Secretary | Acquired A | 263,291 | $0.00 | $0 | 851,465 | Direct |
| 15 Nov, 2025 | Sean E Browne | President And Ceo | Acquired A | 394,937 | $0.00 | $0 | 2,575,274 | Direct |
| 15 Nov, 2025 | Stavros G. Vizirgianakis | Director | Acquired A | 553,797 | $0.00 | $0 | 7,515,570 | Direct |
| 15 Nov, 2025 | Tyler Lipschultz | Director | Acquired A | 158,228 | $0.00 | $0 | 158,228 | Direct |
| 15 Nov, 2025 | John K Bakewell | Director | Acquired A | 158,228 | $0.00 | $0 | 158,228 | Direct |
| 15 Nov, 2025 | Mark A. Schallenberger | Chief Operating Officer | Acquired A | 292,253 | $0.00 | $0 | 670,866 | Direct |