Eli Casdin - 18 Jun 2026 Form 4 Insider Report for GeneDx Holdings Corp. (WGS)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: WGS
Reported as of: 18 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 23 Jun 2026, 16:25:27 UTC
Prior SEC filing: 02 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Bridget Brown, Attorney-in-Fact

Key filing fact

Eli Casdin filed Form 4 for GeneDx Holdings Corp. (WGS) on 23 Jun 2026.

Key facts

This page summarizes Eli Casdin's Form 4 filing for GeneDx Holdings Corp. (WGS).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 23 Jun 2026, 16:25.

Change

Previous filing in this sequence was filed on 02 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001534264 Primary reporting owner

Casdin Eli

Relationship: Director, 10%+ Owner
Address: C/O GENEDX HOLDINGS CORP., 333 LUDLOW ST., NORTH TOWER, 6TH FLOOR, STAMFORD
Signature: /s/ Bridget Brown, Attorney-in-Fact
Signature date: 23 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

WGS transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +3,576
Change %: +17%
Price: $0.000000^*
Shares after: 24,093
Date: 18 Jun 2026
Ownership: Direct
Footnotes: F1

WGS holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 3,707,164
Date: 18 Jun 2026
Ownership: By Casdin Partners Master Fund, LP
Footnotes: F2

WGS holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 19,247
Date: 18 Jun 2026
Ownership: By Casdin Partners GP, LLC
Footnotes: F3

WGS holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 333,144
Date: 18 Jun 2026
Ownership: By CMLS Holdings LLC
Footnotes: F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

WGS transaction Derivative

Restricted Stock Unit

Award

Transaction value
Shares: +4,248
Change %
Price: $0.000000^*
Shares after: 4,248
Date: 18 Jun 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 4,248
Exercise price
Footnotes: F1, F5

WGS transaction Derivative

Restricted Stock Unit

Options Exercise

Transaction value
Shares: -3,576
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 18 Jun 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 3,576
Exercise price
Footnotes: F1, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

Each restricted stock unit ("RSU") represents a contingent right to receive 1 share of the Issuer's Class A Common Stock upon settlement for no consideration.

Footnote F2

The securities are owned directly by Casdin Partners Master Fund, L.P. (the "Master Fund") and may be deemed to be indirectly beneficially owned by (i) Casdin Capital, LLC, the investment adviser to the Master Fund ("Casdin"), (ii) Casdin Partners GP, LLC, the general partner of the Master Fund (the "GP"), and (iii) the Reporting Person, who is the managing member of Casdin and the GP.

Footnote F3

The securities are owned directly by the GP and may be deemed to be indirectly beneficially owned by the Reporting Person, who is the managing member of the GP.

Footnote F4

The securities are owned directly by CMLS Holdings LLC ("CMLS Holdings"). The Board of Managers of CMLS Holdings includes the Reporting Person, who, as a member of the Board of Managers of CMLS Holdings, shares voting and investment discretion with respect to securities held by CMLS Holdings.

Footnote F5

The entire award shall vest on the earlier of the (i) date of the 2027 annual meeting of the Issuer's stockholders, or (ii) first anniversary of the grant date, subject to the Reporting Person's continued service to the Issuer through the vesting date. These RSUs do not have an expiration date; they either vest or are cancelled prior to the vesting date.

Footnote F6

The entire award vested or vests on the earlier of the: (i) date of the 2026 annual meeting of the Issuer's stockholders, or (ii) first anniversary of the grant date, subject to the Reporting Person's continued service to the Issuer through the vesting date. These RSUs do not have an expiration date; they either vest or are cancelled prior to the vesting date.

SEC remarks

The Reporting Person disclaims beneficial ownership of the securities reported on this Form 4 except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 under the Securities Exchange Act of 1934, as amended, or for any other purpose.