ATEX's three largest insider shareholders as of September 12, 2026 are William Heard (Director, 1.74Mn shares), William Heard (Director, 1.67Mn shares), Jeffrey A Altman (Director, 124.19K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | William Heard | Director | 3,965 | 1,670,338 | 1,674,303 | 69.8% | 20 Aug, 2026 |
| 2 | Jeffrey A Altman | Director, TenPercentOwner | 141,206 | 0 | 141,206 | 5.9% | 06 Aug, 2026 |
| 3 | Robert Harris Schwartz | President And Ceo | 115,867 | 0 | 115,867 | 4.8% | 26 Aug, 2024 |
| 4 | Timothy Gray | Chief Financial Officer | 77,022 | 0 | 77,022 | 3.2% | 20 Aug, 2025 |
| 5 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | 44,876 | 0 | 44,876 | 1.9% | 27 Aug, 2026 |
| 6 | Leslie B Daniels | Director | 43,477 | 0 | 43,477 | 1.8% | 11 Sep, 2026 |
| 7 | Ryan Gerbrandt | Chief Operating Officer | 42,362 | 0 | 42,362 | 1.8% | 15 Jul, 2025 |
| 8 | Scott A. Lang | President And Ceo | 41,470 | 0 | 41,470 | 1.7% | 17 Aug, 2026 |
| 9 | Heather Martin | Chief Marketing Officer | 26,743 | 0 | 26,743 | 1.1% | 11 Sep, 2026 |
| 10 | Paul N Saleh | Director | 24,175 | 0 | 24,175 | 1.0% | 30 Aug, 2023 |
| 11 | Morgan E Obrien | Executive Chairman | 23,973 | 0 | 23,973 | 1.0% | 17 Dec, 2024 |
| 12 | Singleton B Mcallister | Director | 21,599 | 0 | 21,599 | 0.9% | 30 Aug, 2023 |
| 13 | Mahvash Yazdi | Director | 21,005 | 0 | 21,005 | 0.9% | 06 Aug, 2026 |
| 14 | Elena Marquez | Chief Financial Officer | 18,156 | 0 | 18,156 | 0.8% | 14 Jul, 2026 |
| 15 | Greg Haller | Director | 17,414 | 0 | 17,414 | 0.7% | 30 Aug, 2023 |
| 16 | Thomas R. Kuhn | Director, Other | 16,594 | 0 | 16,594 | 0.7% | 16 Jun, 2025 |
| 17 | Mark Fleischhauer | Director | 14,367 | 0 | 14,367 | 0.6% | 06 Aug, 2026 |
| 18 | Gregory A Pratt | Director | 13,939 | 0 | 13,939 | 0.6% | 30 Aug, 2023 |
| 19 | Hamid Akhavan | Director | 10,706 | 0 | 10,706 | 0.4% | 18 Nov, 2021 |
| 20 | Gena L Ashe | Chief Legal Officer Corp Sec | 9,238 | 0 | 9,238 | 0.4% | 09 Sep, 2026 |
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 |
|---|---|---|---|---|---|---|---|---|
| 10 Sep, 2026 | Leslie B Daniels | Director | Disposed S | 2,500 | $83.83 | $209.58K | 43,477 | Direct |
| 09 Sep, 2026 | Heather Martin | Chief Marketing Officer | Disposed F | 3,465 | $85.44 | $296.05K | 34,807 | Direct |
| 10 Sep, 2026 | Heather Martin | Chief Marketing Officer | Disposed S | 8,064 | $84.20 | $679.00K | 26,743 | Direct |
| 08 Sep, 2026 | Gena L Ashe | Chief Legal Officer Corp Sec | Disposed S | 293 | $85.44 | $25.03K | 9,238 | Direct |
| 08 Sep, 2026 | Gena L Ashe | Chief Legal Officer Corp Sec | Acquired M | 6,833 | $34.96 | $238.88K | 16,071 | Direct |
| 08 Sep, 2026 | Gena L Ashe | Chief Legal Officer Corp Sec | Disposed F | 2,769 | $86.27 | $238.88K | 13,302 | Direct |
| 08 Sep, 2026 | Gena L Ashe | Chief Legal Officer Corp Sec | Disposed S | 4,064 | $85.44 | $347.23K | 9,238 | Direct |
| 08 Sep, 2026 | Gena L Ashe | Chief Legal Officer Corp Sec | Disposed M | 6,833 | $0.00 | $0 | 35,658 | Direct |
| 08 Sep, 2026 | Gena L Ashe | Chief Legal Officer Corp Sec | Disposed S | 293 | $85.44 | $25.03K | 9,238 | Direct |
| 03 Sep, 2026 | Leslie B Daniels | Director | Disposed S | 6,000 | $87.15 | $522.90K | 50,077 | Direct |
| 04 Sep, 2026 | Leslie B Daniels | Director | Disposed S | 2,900 | $87.31 | $253.20K | 47,177 | Direct |
| 08 Sep, 2026 | Gena L Ashe | Chief Legal Officer Corp Sec | Disposed S | 4,064 | $85.44 | $347.23K | 5,174 | Direct |
| 04 Sep, 2026 | Leslie B Daniels | Director | Disposed S | 1,200 | $86.50 | $103.80K | 45,977 | Direct |
| 25 Aug, 2026 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | Acquired M | 40,000 | $34.72 | $1.39Mn | 84,876 | Direct |
| 25 Aug, 2026 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | Disposed F | 16,561 | $90.38 | $1.50Mn | 68,315 | Direct |
| 25 Aug, 2026 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | Disposed S | 5,372 | $93.59 | $502.75K | 62,943 | Direct |
| 25 Aug, 2026 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | Disposed S | 7,791 | $92.77 | $722.76K | 55,152 | Direct |
| 25 Aug, 2026 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | Disposed S | 7,580 | $91.69 | $695.04K | 47,572 | Direct |
| 25 Aug, 2026 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | Disposed S | 2,696 | $90.61 | $244.28K | 44,876 | Direct |
| 25 Aug, 2026 | Christopher Guttman-Mccabe | Chief Reg Comm Officer | Disposed M | 40,000 | $0.00 | $0 | 0 | Direct |