As of September 12, 2026, Adaptive Biotechnologies's top three insider holders are Chad M Robins (Ceo And Chairman, 2.18Mn shares), Harlan S Robins (Chief Scientific Officer, 812.06K shares), Tycho Peterson (Chief Financial Officer, 531.55K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Chad M Robins | Ceo And Chairman | 2,180,518 | 0 | 2,180,518 | 36.6% | 19 Aug, 2026 |
| 2 | Harlan S Robins | Chief Scientific Officer | 812,058 | 0 | 812,058 | 13.6% | 23 Jul, 2026 |
| 3 | Tycho Peterson | Chief Financial Officer | 531,553 | 0 | 531,553 | 8.9% | 06 Mar, 2024 |
| 4 | Susan Bobulsky | Chief Commercial Officer, Mrd | 396,989 | 0 | 396,989 | 6.7% | 12 Aug, 2026 |
| 5 | Julie Rubinstein | President And Coo | 377,802 | 0 | 377,802 | 6.3% | 29 Apr, 2026 |
| 6 | Kyle Piskel | Chief Financial Officer | 256,725 | 0 | 256,725 | 4.3% | 20 May, 2026 |
| 7 | Francis Lo | Chief People Officer | 230,713 | 0 | 230,713 | 3.9% | 17 Jul, 2026 |
| 8 | Sharon Benzeno | Chief Commercial Ofc Imm Med | 221,278 | 0 | 221,278 | 3.7% | 30 Jun, 2026 |
| 9 | Nitin Sood | Chief Commercial Officer, Mrd | 214,808 | 0 | 214,808 | 3.6% | 08 Aug, 2023 |
| 10 | R Mark Adams | Chief Operating Officer | 175,361 | 0 | 175,361 | 2.9% | 12 Apr, 2023 |
| 11 | Stacy L Taylor | Svp And General Counsel | 139,365 | 0 | 139,365 | 2.3% | 23 Aug, 2024 |
| 12 | Peter M Neupert | Director | 130,625 | 0 | 130,625 | 2.2% | 19 Aug, 2026 |
| 13 | Michael J Pellini | Director | 69,690 | 0 | 69,690 | 1.2% | 06 Mar, 2025 |
| 14 | Katey Einterz Owen | Director | 66,100 | 0 | 66,100 | 1.1% | 02 Sep, 2026 |
| 15 | Robert Hershberg | Director | 46,683 | 0 | 46,683 | 0.8% | 20 Aug, 2026 |
| 16 | Leslie Trigg | Director | 25,907 | 0 | 25,907 | 0.4% | 08 Mar, 2023 |
| 17 | Kevin T Conroy | Director | 22,968 | 0 | 22,968 | 0.4% | 08 Mar, 2023 |
| 18 | Chad M Cohen | Chief Financial Officer | 21,604 | 0 | 21,604 | 0.4% | 23 Dec, 2021 |
| 19 | Lance Baldo | Chief Medical Officer | 17,171 | 0 | 17,171 | 0.3% | 10 Mar, 2022 |
| 20 | Michelle Renee Griffin | Director | 15,625 | 0 | 15,625 | 0.3% | 29 Jun, 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 |
|---|---|---|---|---|---|---|---|---|
| 31 Aug, 2026 | Katey Einterz Owen | Director | Disposed G | 12,539 | — | — | 66,100 | Direct |
| 26 Aug, 2026 | Katey Einterz Owen | Director | Disposed S | 9,615 | $26.00 | $249.99K | 78,639 | Direct |
| 18 Aug, 2026 | Robert Hershberg | Director | Acquired M | 15,000 | $6.32 | $94.80K | 77,347 | Direct |
| 18 Aug, 2026 | Robert Hershberg | Director | Disposed S | 15,000 | $24.39 | $365.85K | 62,347 | Direct |
| 18 Aug, 2026 | Robert Hershberg | Director | Disposed S | 15,664 | $24.41 | $382.36K | 46,683 | Direct |
| 18 Aug, 2026 | Robert Hershberg | Director | Disposed M | 15,000 | $0.00 | $0 | 0 | Direct |
| 17 Aug, 2026 | Chad M Robins | Ceo And Chairman | Acquired M | 321,324 | $6.55 | $2.10Mn | 2,501,842 | Direct |
| 17 Aug, 2026 | Peter M Neupert | Director | Acquired M | 15,000 | $6.32 | $94.80K | 255,315 | Direct |
| 17 Aug, 2026 | Peter M Neupert | Director | Disposed S | 15,000 | $25.23 | $378.45K | 240,315 | Direct |
| 17 Aug, 2026 | Chad M Robins | Ceo And Chairman | Disposed S | 318,799 | $25.08 | $8.00Mn | 2,183,043 | Direct |
| 17 Aug, 2026 | Chad M Robins | Ceo And Chairman | Disposed S | 2,525 | $25.57 | $64.56K | 2,180,518 | Direct |
| 17 Aug, 2026 | Peter M Neupert | Director | Disposed S | 40,000 | $25.10 | $1.00Mn | 200,315 | Direct |
| 17 Aug, 2026 | Peter M Neupert | Director | Disposed S | 69,690 | $25.16 | $1.75Mn | 130,625 | Direct |
| 18 Aug, 2026 | Chad M Robins | Ceo And Chairman | Acquired M | 278,676 | $6.55 | $1.83Mn | 2,459,194 | Direct |
| 17 Aug, 2026 | Peter M Neupert | Director | Disposed M | 15,000 | $0.00 | $0 | 0 | Direct |
| 18 Aug, 2026 | Chad M Robins | Ceo And Chairman | Disposed S | 278,472 | $24.48 | $6.82Mn | 2,180,722 | Direct |
| 18 Aug, 2026 | Chad M Robins | Ceo And Chairman | Disposed S | 204 | $25.14 | $5.13K | 2,180,518 | Direct |
| 17 Aug, 2026 | Chad M Robins | Ceo And Chairman | Disposed M | 321,324 | $0.00 | $0 | 278,676 | Direct |
| 18 Aug, 2026 | Chad M Robins | Ceo And Chairman | Disposed M | 278,676 | $0.00 | $0 | 0 | Direct |
| 10 Aug, 2026 | Susan Bobulsky | Chief Commercial Officer, Mrd | Disposed S | 3,000 | $25.00 | $75.00K | 396,989 | Direct |