As of September 29, 2026, the three largest insider holders of ATEN are Partners L P Summit (Other, 8.88Mn shares), Peter Y Chung (Director, 8.88Mn shares), Partners L P Summit (TenPercentOwner, 5.39Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Partners L P Summit | TenPercentOwner | 0 | 5,388,206 | 5,388,206 | 71.1% | 09 Sep, 2022 |
| 2 | Dhrupad Trivedi | Chief Executive Officer | 887,847 | 0 | 887,847 | 11.7% | 15 May, 2026 |
| 3 | Robert D Cochran | Evp Legal Corp Collaboration | 344,161 | 0 | 344,161 | 4.5% | 29 Jun, 2022 |
| 4 | Peter Y Chung | Director | 0 | 207,298 | 207,298 | 2.7% | 24 Apr, 2026 |
| 5 | Tor Braham | Director | 192,812 | 0 | 192,812 | 2.5% | 22 Apr, 2026 |
| 6 | Eric Singer | Director | 142,379 | 0 | 142,379 | 1.9% | 06 May, 2026 |
| 7 | Dana Elizabeth Wolf | Director | 97,539 | 0 | 97,539 | 1.3% | 25 Aug, 2026 |
| 8 | Matthew P Bruening | Evp, Worldwide Sales Mktg | 85,307 | 0 | 85,307 | 1.1% | 14 Nov, 2023 |
| 9 | Brian Becker | Chief Financial Officer | 77,599 | 0 | 77,599 | 1.0% | 14 Aug, 2025 |
| 10 | Robert Scott Weber | General Counsel | 50,586 | 0 | 50,586 | 0.7% | 12 Aug, 2026 |
| 11 | Sheen George Khoury | Executive Vp, Sales And Mktg | 44,294 | 0 | 44,294 | 0.6% | 13 Feb, 2026 |
| 12 | Michelle Elizabeth Caron | Chief Financial Officer | 35,614 | 0 | 35,614 | 0.5% | 15 May, 2026 |
| 13 | Karen S. Thomas | Evp, Worldwide Sales And Mkt | 28,152 | 0 | 28,152 | 0.4% | 30 Dec, 2024 |
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 |
|---|---|---|---|---|---|---|---|---|
| 25 Aug, 2026 | Dana Elizabeth Wolf | Director | Disposed S | 2,652 | $25.65 | $68.02K | 57,409 | Direct |
| 11 Aug, 2026 | Robert Scott Weber | General Counsel | Disposed S | 14,086 | $27.86 | $392.44K | 50,586 | Direct |
| 06 Jul, 2026 | Robert Scott Weber | General Counsel | Disposed F | 1,897 | $36.30 | $68.86K | 64,672 | Direct |
| 14 May, 2026 | Dhrupad Trivedi | Chief Executive Officer | Acquired M | 65,758 | $0.00 | $0 | 857,299 | Direct |
| 15 May, 2026 | Michelle Elizabeth Caron | Chief Financial Officer | Disposed F | 760 | $28.03 | $21.30K | 35,614 | Direct |
| 15 May, 2026 | Robert Scott Weber | General Counsel | Disposed F | 1,930 | $28.03 | $54.10K | 65,527 | Direct |
| 14 May, 2026 | Michelle Elizabeth Caron | Chief Financial Officer | Acquired M | 2,989 | $0.00 | $0 | 36,374 | Direct |
| 15 May, 2026 | Dhrupad Trivedi | Chief Executive Officer | Disposed F | 32,858 | $28.03 | $921.01K | 887,847 | Direct |
| 14 May, 2026 | Robert Scott Weber | General Counsel | Acquired M | 3,706 | $0.00 | $0 | 63,575 | Direct |
| 14 May, 2026 | Robert Scott Weber | General Counsel | Acquired M | 3,882 | $0.00 | $0 | 67,457 | Direct |
| 15 May, 2026 | Michelle Elizabeth Caron | Chief Financial Officer | Disposed F | 748 | $27.00 | $20.20K | 35,626 | Direct |
| 14 May, 2026 | Dhrupad Trivedi | Chief Executive Officer | Acquired M | 63,406 | $0.00 | $0 | 920,705 | Direct |
| 15 May, 2026 | Dhrupad Trivedi | Chief Executive Officer | Disposed F | 32,858 | $27.00 | $887.17K | 887,847 | Direct |
| 14 May, 2026 | Michelle Elizabeth Caron | Chief Financial Officer | Disposed M | 2,989 | $0.00 | $0 | 0 | Direct |
| 15 May, 2026 | Robert Scott Weber | General Counsel | Disposed F | 1,930 | $27.00 | $52.11K | 65,527 | Direct |
| 14 May, 2026 | Dhrupad Trivedi | Chief Executive Officer | Disposed M | 65,758 | $0.00 | $0 | 0 | Direct |
| 14 May, 2026 | Robert Scott Weber | General Counsel | Disposed M | 3,706 | $0.00 | $0 | 0 | Direct |
| 14 May, 2026 | Robert Scott Weber | General Counsel | Disposed M | 3,882 | $0.00 | $0 | 0 | Direct |
| 14 May, 2026 | Dhrupad Trivedi | Chief Executive Officer | Disposed M | 63,406 | $0.00 | $0 | 0 | Direct |
| 05 May, 2026 | Eric Singer | Director | Disposed S | 24,698 | $27.21 | $672.03K | 68,806 | Direct |