GeneDx Holdings's top three insider shareholders as of September 17, 2026 are Keith A. Meister (Director, 4.78Mn shares), Capital, Llc Casdin (Director, 3.71Mn shares), Capital, Llc Casdin (Director, 3.51Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Capital, Llc Casdin | Director, TenPercentOwner | 0 | 6,714,328 | 6,714,328 | 53.8% | 08 Jun, 2026 |
| 2 | School Of Medicine At Mount Sinai Icahn | TenPercentOwner | 2,719,692 | 0 | 2,719,692 | 21.8% | 19 Nov, 2024 |
| 3 | Health, Inc. Opko | TenPercentOwner | 2,646,972 | 0 | 2,646,972 | 21.2% | 19 Aug, 2024 |
| 4 | Katherine Stueland | Chief Executive Officer | 115,476 | 0 | 115,476 | 0.9% | 18 Sep, 2026 |
| 5 | Richard C Jr Pfenniger | Director | 45,082 | 0 | 45,082 | 0.4% | 23 Jun, 2026 |
| 6 | Kevin Feeley | Chief Financial Officer | 44,945 | 0 | 44,945 | 0.4% | 18 Sep, 2026 |
| 7 | Joshua Ruch | Director | 33,299 | 0 | 33,299 | 0.3% | 23 Jun, 2026 |
| 8 | Kareem Saad | Chief Transformation Officer | 29,517 | 0 | 29,517 | 0.2% | 19 Mar, 2024 |
| 9 | Emily M. Leproust | Director | 24,852 | 0 | 24,852 | 0.2% | 23 Jun, 2026 |
| 10 | Eli Casdin | Director, TenPercentOwner | 24,093 | 0 | 24,093 | 0.2% | 23 Jun, 2026 |
| 11 | Keith A. Meister | Director, TenPercentOwner | 23,705 | 0 | 23,705 | 0.2% | 23 Jun, 2026 |
| 12 | Jason Ryan | Executive Chairman | 15,480 | 0 | 15,480 | 0.1% | 23 Jun, 2026 |
| 13 | Daniel Emmett Clark | Secretary And General Counsel | 9,460 | 0 | 9,460 | 0.1% | 27 Jul, 2022 |
| 14 | Isaac Ro | Chief Financial Officer | 7,394 | 0 | 7,394 | 0.1% | 10 Aug, 2022 |
| 15 | Eric Schadt | President Chief Rd Officer | 7,374 | 0 | 7,374 | 0.1% | 24 May, 2022 |
| 16 | Tactical Opportunities Associates Iii - Nq L.P. Blackstone | TenPercentOwner | 0 | 4,918 | 4,918 | 0.0% | 03 May, 2022 |
| 17 | Sema4 Holdings L.P. Bto | TenPercentOwner | 0 | 4,918 | 4,918 | 0.0% | 03 May, 2022 |
| 18 | Karen Ann White | Chief People Officer | 4,761 | 0 | 4,761 | 0.0% | 27 Jul, 2023 |
| 19 | Rachel E. Sherman | Director | 1,766 | 0 | 1,766 | 0.0% | 04 May, 2023 |
| 20 | Nat Turner | Director | 1,146 | 0 | 1,146 | 0.0% | 12 May, 2022 |
| 21 | Thomas Fuchs | Director | 1,146 | 0 | 1,146 | 0.0% | 18 Sep, 2026 |
| 22 | Shawn Assad | Chief Accounting Officer | 973 | 0 | 973 | 0.0% | 12 May, 2022 |
| 23 | Richard Miao | Other | 753 | 0 | 753 | 0.0% | 26 Aug, 2022 |
| 24 | James Coffin | President And Coo | 694 | 0 | 694 | 0.0% | 03 Dec, 2021 |
| 25 | Michael J Pellini | Director | 519 | 0 | 519 | 0.0% | 18 Oct, 2022 |
| 26 | Anthony Prentice | Chief Product Officer | 367 | 0 | 367 | 0.0% | 27 Jul, 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 |
|---|---|---|---|---|---|---|---|---|
| 16 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Acquired M | 18,750 | $0.00 | $0 | 125,977 | Direct |
| 16 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Acquired M | 7,197 | $0.00 | $0 | 48,673 | Direct |
| 17 Sep, 2026 | Thomas Fuchs | Director | Acquired M | 1,146 | $0.00 | $0 | 1,146 | Direct |
| 16 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Disposed S | 586 | $94.26 | $55.24K | 48,087 | Direct |
| 16 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Disposed S | 1,648 | $94.26 | $155.34K | 124,329 | Direct |
| 17 Sep, 2026 | Thomas Fuchs | Director | Disposed M | 1,146 | $0.00 | $0 | 2,292 | Direct |
| 16 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Disposed S | 52 | $95.41 | $4.96K | 48,035 | Direct |
| 16 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Disposed S | 148 | $95.41 | $14.12K | 124,181 | Direct |
| 16 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Disposed S | 541 | $96.90 | $52.42K | 47,494 | Direct |
| 16 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Disposed S | 1,525 | $96.90 | $147.77K | 122,656 | Direct |
| 16 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Disposed S | 1,470 | $98.27 | $144.46K | 46,024 | Direct |
| 16 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Disposed S | 4,141 | $98.27 | $406.94K | 118,515 | Direct |
| 16 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Disposed S | 3,039 | $99.00 | $300.85K | 115,476 | Direct |
| 16 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Disposed S | 1,079 | $99.00 | $106.82K | 44,945 | Direct |
| 16 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Disposed M | 7,197 | $0.00 | $0 | 14,393 | Direct |
| 16 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Disposed M | 18,750 | $0.00 | $0 | 37,500 | Direct |
| 09 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Acquired M | 2,462 | $0.00 | $0 | 42,761 | Direct |
| 09 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Acquired M | 6,547 | $0.00 | $0 | 110,919 | Direct |
| 09 Sep, 2026 | Katherine Stueland | Chief Executive Officer | Disposed S | 3,692 | $84.22 | $310.93K | 107,227 | Direct |
| 09 Sep, 2026 | Kevin Feeley | Chief Financial Officer | Disposed S | 1,285 | $84.22 | $108.22K | 41,476 | Direct |