GeneDx
Runs exome and genome testing for pediatric and rare-disease diagnosis.
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Breakdown13F · Form 4
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 29.82M · Float —
Float — provider float is below the insider stake.
The provider's float is smaller than the insider stake it should exclude, so it is not shown.
Institutions13F, as of Jun 30, 2026
239 holders · 33.24M shares · 58 new positions · 144 increased · 60 reduced · 74 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Corvex Management LP | 4.78M | 16.04% | +1.56M | Aug 14, 2026 |
| Casdin Capital, LLC | 3.71M | 12.43% | +700.0K | Aug 14, 2026 |
| BlackRock, Inc. | 1.71M | 5.72% | +155.5K | Aug 7, 2026 |
| Goldman Sachs Group Inc | 1.67M | 5.60% | +334.5K | Aug 14, 2026 |
| Ark Investment Management LLC | 1.61M | 5.40% | +285.6K | Aug 14, 2026 |
| William Blair Investment Management, LLC | 1.40M | 4.70% | +625.4K | Aug 12, 2026 |
| Morgan Stanley | 988.3K | 3.31% | +456.1K | Aug 13, 2026 |
| Vanguard Capital Management LLC | 879.0K | 2.95% | +20.4K | Aug 13, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Keith A. Meisterincl. Eli Casdin, Casdin Partners GP, LLC +6 more | 17.90% | 5.36M | 13D | May 22, 2026 ↗ |
| Meister, Keith A.incl. Casdin Partners Master Fund, L.P., CMLS Holdings LLC +6 more | 17.90% | 5.36M | 13D | May 15, 2026 ↗ |
| Casdin Eliincl. Casdin Partners GP, LLC, Keith A. Meister +7 more | 14.20% | 4.10M | 13D | May 7, 2025 ↗ |
| OPKO Health, Inc. | 8.06% | 2.17M | 13D/A | Sep 18, 2024 ↗ |
| The Goldman Sachs Group, Inc. | 5.80% | 1.73M | 13G | Aug 11, 2026 ↗ |
| BlackRock, Inc. | 5.50% | 1.62M | 13G | Jul 28, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Keith A. Meister | director, 10 percent owner: | 4.79M | 16.06% | Jun 23, 2026 |
| Casdin Capital, LLC | director, 10 percent owner: | 3.71M | 12.43% | Jun 8, 2026 |
| Jason Ryan | director | 118.8K | 0.40% | Jun 23, 2026 |
| Katherine Stueland | director, officer: CHIEF EXECUTIVE OFFICER | 104.4K | 0.35% | Jun 18, 2026 |
| Joshua Ruch | director | 45.2K | 0.15% | Jun 23, 2026 |
| Richard C. Jr Pfenniger | director | 45.1K | 0.15% | Jun 23, 2026 |
| Kevin Feeley | officer: CHIEF FINANCIAL OFFICER | 40.0K | 0.13% | Jun 18, 2026 |
| Emily M. Leproust | director | 24.9K | 0.08% | Jun 23, 2026 |
| Eli Casdin | director, 10 percent owner: | 24.1K | 0.08% | Jun 23, 2026 |
7 ten-percent owners hold 6.47M shares by Form 4, outside the officers-and-directors figure above · 12 people have not refiled in the last 18 months (5.83M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Jun 16, 2026 | Katherine Stuelanddirector, officer: CHIEF EXECUTIVE OFFICER | Sale · 3 lots | 10,501 | $60.77 | 104,372 |
| Jun 16, 2026 | Kevin Feeleyofficer: CHIEF FINANCIAL OFFICER | Sale · 3 lots | 3,729 | $60.77 | 39,954 |
| Jun 9, 2026 | Katherine Stuelanddirector, officer: CHIEF EXECUTIVE OFFICER | Sale | 3,639 | $53.77 | 96,123 |
| Jun 9, 2026 | Kevin Feeleyofficer: CHIEF FINANCIAL OFFICER | Sale | 1,266 | $53.77 | 36,486 |
| Jun 4, 2026 | Casdin Capital, LLCdirector, 10 percent owner: | Purchase | 150,000 | $56.44 | 3,657,164 |
| Jun 5, 2026 | Casdin Capital, LLCdirector, 10 percent owner: | Purchase | 50,000 | $52.86 | 3,707,164 |
| May 18, 2026 | Casdin Capital, LLCdirector, 10 percent owner: | Purchase | 175,000 | $42.55 | 3,182,164 |
| May 19, 2026 | Casdin Capital, LLCdirector, 10 percent owner: | Purchase | 185,000 | $42.60 | 3,367,164 |
| May 20, 2026 | Casdin Capital, LLCdirector, 10 percent owner: | Purchase | 140,000 | $43.81 | 3,507,164 |
| May 13, 2026 | Keith A. Meisterdirector, 10 percent owner: | Purchase · 2 lots | 165,000 | $39.09 | 4,598,297 |
CongressHouse and Senate disclosures
Not reported.