Fairmount Funds Management LLC bought $3.0M of Zenas BioPharma (ZBIO)
Executed Mar 31, disclosed Apr 1, 1 day later.
Over the 21 trading sessions from the disclosed entry session (Apr 1), the stock returned -5.2% (delay-adjusted); from the execution session (Mar 31), -6.0%. Derived: entry at the session's open, exit at the close 20 sessions later.
Fairmount Funds Management LLC (Director) filed 10 Form 4 reports as a reporting entity in the trailing twelve months (6 purchases, 4 sales), most often in Cogent Biosciences, Inc. (COGT). Across 6 priced purchase filings, the average 21-session return was +5.9% from execution and +8.5% from disclosure (delay-adjusted; derived). The largest single filing was $399.7M of SYRE (4,684,781 sh × $85.31, as filed), executed Jun 23.
Healthcare · Zenas BioPharma, Inc., a clinical-stage biopharma company, engages in the development and commercialization of transformative immunology-ba…
More Healthcare filings→ Insider filings, newest first→ View the original filing at www.sec.gov→316,219 sh × $19.00
Exec Oct 7 2025
Filed Oct 9 2025 · 4:15 PM ET ZBIOPURCHASE Zenas BioPharma, Inc. $5.1M
300,000 sh × $17.00
Exec Sep 16 2024
Filed Sep 17 2024 · 5:30 PM ET