SEC Form 4 · accession 0001193125-26-267706
Jade Biosciences, Inc. · JBIO
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owners
Peter Evan Harwin
Director · 10% Owner
Fairmount Healthcare Fund II L.P.
Director · 10% Owner
Fairmount Funds Management LLC
Director · 10% Owner
Tomas Kiselak
Director · 10% Owner
Fairmount Healthcare Co-Invest IV L.P.
Director · 10% Owner
Period of report
Jun 9, 2026
Accepted (ET)
Jun 11, 2026 · 4:37 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001798749
Table I — non-derivative securities
No Table I lines on this filing.
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Stock Option (Right to Buy)F2,F1 | $15.22 | Jun 9, 2026 | A | 34,843 | A | — | Jun 8, 2036 | Common Stock | 34,843 | 34,843 | D |
Explanation of responses
- F1This option represents a right to purchase shares of the Issuer's common stock, which vests in full on the earlier of (i) June 9, 2027 or (ii) the date of the next annual meeting of the Issuer's stockholders, in each case, subject to Tomas Kiselak's continued service to the Issuer.
- F2Fairmount Funds Management LLC ("Fairmount") is the investment manager for Fairmount Healthcare Fund II LP ("Fund II") and Fairmount Healthcare Co-Invest IV L.P. ("Co-Invest"). Peter Harwin and Tomas Kiselak are the managers of Fairmount. Under Mr. Kiselak's arrangement with Fairmount, Mr. Kiselak holds the option for one or more investment vehicles managed by Fairmount (each, a "Fairmount Fund"). Mr. Kiselak is obligated to turn over to Fairmount any net cash or stock received from the option for the benefit of such Fairmount Fund. Fairmount, Mr. Harwin, and Mr. Kiselak disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.
Remarks
Fairmount, Fairmount Healthcare Fund II L.P. and Fairmount Healthcare Co-Invest IV L.P. may each be deemed a director by deputization of the Issuer by virtue of the fact that Tomas Kiselak serves on the board of directors of the Issuer and is also a Managing Member of Fairmount.