Marantz Jing L. 4

What Happened Jing L. Marantz, Chief Medical Officer of Scholar Rock Holding Corp (SRRK), had 5,798 shares sold on January 16, 2026 at $44.48 per share, producing proceeds of $257,882. This was a sale (not a purchase) executed to satisfy tax withholding tied to RSUs that vested on January 15, 2026; it was a mandated "sell-to-cover" transaction rather than a discretionary trade by the insider.

Key Details

• Transaction date and price: January 16, 2026 — 5,798 shares sold at $44.48 each (total ~$257,882).
• Report filed: Form 4 filed on January 21, 2026 (5 days after the transaction); Form 4s are normally due within two business days, so this filing appears later than typical.
• Ownership after transaction (reported): 24,974 shares of common stock and 70,713 RSUs (95,687 total reported units) as noted in the filing.
• Footnotes: The sale was required to cover tax withholding on RSUs that vested Jan 15, 2026 (RSUs were granted Feb 12, 2024). The sale was executed by a brokerage designated by the issuer and was not a discretionary sale by the Reporting Person.
• Transaction code: S (sale); footnote F1 clarifies this is a tax-withholding "sell-to-cover" (transaction code F in some contexts).

Context This transaction reflects routine tax withholding on vested equity, not an open-market decision to reduce a position. For retail investors, mandated sell-to-cover transactions are common and generally carry less informational weight about an insider’s view of the company than voluntary open-market sales or purchases.