Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
CMLS Holdings LLC - 07 May 2026 SCHEDULE 13D/A Report for GeneDx Holdings Corp. Class A common stock, par value $0.0001 per share (WGS)
- Filing manager
- CMLS Holdings LLC
- Reporting owner
- Meister, Keith A.
- Beneficially owned shares
- 5,005,494 shares
- Large-stake signal
-
Ownership
17%Beneficial ownership of this reported class.
Shares
5,005,494 sharesShares beneficially owned as disclosed.
Event date
07 May 2026Date tied to the ownership event or amendment.
Accepted by SEC
11 May 2026EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 17%
- Symbol
- WGS
- Shares outstanding
- 29,973,018 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 11 May 2026, 21:20:34 UTC
- Event date
- 07 May 2026
- Next SEC filing
- 15 May 2026
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
5 source fields
Key filing fact
CMLS Holdings LLC disclosed 17% ownership in GeneDx Holdings Corp. Class A common stock, par value $0.0001 per share (WGS) on 07 May 2026.
Key facts
- CMLS Holdings LLC filed SCHEDULE 13D/A for GeneDx Holdings Corp. Class A common stock, par value $0.0001 per share (WGS).
- Disclosed ownership: 17%.
- Date of event: 07 May 2026.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 11 May 2026, 21:20.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (9)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| CMLS HOLDINGS LLC | 1.8% | 537,285 | 0 | 537,285 | /s/ Eli Casdin | Eli Casdin / Manager | 0001822257 |
| C-LSH LLC | 1.8% | 537,285 | 0 | 537,285 | /s/ Eli Casdin | Eli Casdin / Managing Member | |
| M-LSH LLC | 1.8% | 537,285 | 0 | 537,285 | /s/ Keith A. Meister | Keith A. Meister / Managing Member | |
| Casdin Capital, LLC | 10% | 3,007,164 | 0 | 3,007,164 | /s/ Eli Casdin | Eli Casdin / Managing Member | |
| Casdin Partners Master Fund, L.P. | 10% | 3,007,164 | 0 | 3,007,164 | /s/ Eli Casdin | Eli Casdin / Managing Member of Casdin Partners GP, LLC, its general partner | |
| Casdin Partners GP, LLC | 10% | 3,026,411 | 0 | 3,026,411 | /s/ Eli Casdin | Eli Casdin / Managing Member | |
| Eli Casdin | 12% | 3,599,671 | 35,975 | 3,563,696 | /s/ Eli Casdin | Eli Casdin / Self | |
| Meister, Keith A. | 17% | 5,005,494 | 4,468,209 | 537,285 | /s/ Keith Meister | Keith Meister / Self | 0001307631 |
| Corvex Management LP | 15% | 4,433,297 | 4,433,297 | 0 | /s/ Keith Meister | Keith Meister / Managing Partner | 0001535472 |
CIK / CUSIP context first