GeneDx Holdings's three largest insider shareholders as of August 27, 2026 are Eli Casdin (Director, 102.15Mn shares), School Of Medicine At Mount Sinai Icahn (TenPercentOwner, 94.61Mn shares), Eli Casdin (Director, 15.99Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Capital, Llc Casdin | Director, TenPercentOwner | 0 | 6,714,328 | 6,714,328 | 52.2% | 08 Jun, 2026 |
| 2 | School Of Medicine At Mount Sinai Icahn | TenPercentOwner | 2,719,692 | 0 | 2,719,692 | 21.1% | 19 Nov, 2024 |
| 3 | Health, Inc. Opko | TenPercentOwner | 2,646,972 | 0 | 2,646,972 | 20.6% | 19 Aug, 2024 |
| 4 | Tactical Opportunities Associates Iii - Nq L.P. Blackstone | TenPercentOwner | 0 | 162,309 | 162,309 | 1.3% | 03 May, 2022 |
| 5 | Sema4 Holdings L.P. Bto | TenPercentOwner | 0 | 162,309 | 162,309 | 1.3% | 03 May, 2022 |
| 6 | Katherine Stueland | Chief Executive Officer | 104,372 | 0 | 104,372 | 0.8% | 18 Jun, 2026 |
| 7 | Rachel E. Sherman | Director | 58,290 | 0 | 58,290 | 0.5% | 04 May, 2023 |
| 8 | Richard C Jr Pfenniger | Director | 45,082 | 0 | 45,082 | 0.4% | 23 Jun, 2026 |
| 9 | Kevin Feeley | Chief Financial Officer | 39,954 | 0 | 39,954 | 0.3% | 18 Jun, 2026 |
| 10 | Nat Turner | Director | 37,836 | 0 | 37,836 | 0.3% | 12 May, 2022 |
| 11 | Joshua Ruch | Director | 33,299 | 0 | 33,299 | 0.3% | 23 Jun, 2026 |
| 12 | Kareem Saad | Chief Transformation Officer | 29,517 | 0 | 29,517 | 0.2% | 19 Mar, 2024 |
| 13 | Emily M. Leproust | Director | 24,852 | 0 | 24,852 | 0.2% | 23 Jun, 2026 |
| 14 | Eli Casdin | Director, TenPercentOwner | 24,093 | 0 | 24,093 | 0.2% | 23 Jun, 2026 |
| 15 | Keith A. Meister | Director, TenPercentOwner | 23,705 | 0 | 23,705 | 0.2% | 23 Jun, 2026 |
| 16 | Jason Ryan | Executive Chairman | 15,480 | 0 | 15,480 | 0.1% | 23 Jun, 2026 |
| 17 | Daniel Emmett Clark | Secretary And General Counsel | 9,460 | 0 | 9,460 | 0.1% | 27 Jul, 2022 |
| 18 | Isaac Ro | Chief Financial Officer | 7,394 | 0 | 7,394 | 0.1% | 10 Aug, 2022 |
| 19 | Eric Schadt | President Chief Rd Officer | 7,374 | 0 | 7,374 | 0.1% | 24 May, 2022 |
| 20 | Karen Ann White | Chief People Officer | 4,761 | 0 | 4,761 | 0.0% | 27 Jul, 2023 |
| 21 | Shawn Assad | Chief Accounting Officer | 973 | 0 | 973 | 0.0% | 12 May, 2022 |
| 22 | Richard Miao | Other | 753 | 0 | 753 | 0.0% | 26 Aug, 2022 |
| 23 | James Coffin | President And Coo | 694 | 0 | 694 | 0.0% | 03 Dec, 2021 |
| 24 | Michael J Pellini | Director | 519 | 0 | 519 | 0.0% | 18 Oct, 2022 |
| 25 | 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 |
|---|---|---|---|---|---|---|---|---|
| 29 Jun, 2026 | Mark A Gardner | President | Acquired A | 35,441 | $0.00 | $0 | 35,441 | Direct |
| 18 Jun, 2026 | Eli Casdin | Director, TenPercentOwner | Acquired M | 3,576 | $0.00 | $0 | 24,093 | Direct |
| 18 Jun, 2026 | Richard C Jr Pfenniger | Director | Acquired M | 3,576 | $0.00 | $0 | 45,082 | Direct |
| 18 Jun, 2026 | Emily M. Leproust | Director | Acquired M | 3,576 | $0.00 | $0 | 24,852 | Direct |
| 18 Jun, 2026 | Thomas Fuchs | Director | Acquired A | 4,248 | $0.00 | $0 | 4,248 | Direct |
| 18 Jun, 2026 | Jason Ryan | Director | Acquired M | 3,576 | $0.00 | $0 | 15,480 | Direct |
| 18 Jun, 2026 | Joshua Ruch | Director | Acquired M | 3,576 | $0.00 | $0 | 33,299 | Direct |
| 18 Jun, 2026 | Keith A. Meister | Director, TenPercentOwner | Acquired M | 3,576 | $0.00 | $0 | 23,705 | Direct |
| 18 Jun, 2026 | Emily M. Leproust | Director | Acquired A | 4,248 | $0.00 | $0 | 4,248 | Direct |
| 18 Jun, 2026 | Richard C Jr Pfenniger | Director | Acquired A | 4,248 | $0.00 | $0 | 4,248 | Direct |
| 18 Jun, 2026 | Jason Ryan | Director | Disposed M | 3,576 | $0.00 | $0 | 0 | Direct |
| 18 Jun, 2026 | Emily M. Leproust | Director | Disposed M | 3,576 | $0.00 | $0 | 0 | Direct |
| 18 Jun, 2026 | Richard C Jr Pfenniger | Director | Disposed M | 3,576 | $0.00 | $0 | 0 | Direct |
| 18 Jun, 2026 | Keith A. Meister | Director, TenPercentOwner | Acquired A | 4,248 | $0.00 | $0 | 4,248 | Direct |
| 18 Jun, 2026 | Joshua Ruch | Director | Acquired A | 4,248 | $0.00 | $0 | 4,248 | Direct |
| 18 Jun, 2026 | Keith A. Meister | Director, TenPercentOwner | Disposed M | 3,576 | $0.00 | $0 | 0 | Direct |
| 18 Jun, 2026 | Eli Casdin | Director, TenPercentOwner | Acquired A | 4,248 | $0.00 | $0 | 4,248 | Direct |
| 18 Jun, 2026 | Joshua Ruch | Director | Disposed M | 3,576 | $0.00 | $0 | 0 | Direct |
| 18 Jun, 2026 | Eli Casdin | Director, TenPercentOwner | Disposed M | 3,576 | $0.00 | $0 | 0 | Direct |
| 16 Jun, 2026 | Katherine Stueland | Chief Executive Officer | Acquired M | 18,750 | $0.00 | $0 | 114,873 | Direct |