Brooks Gabriel 4

What Happened
Dr. Brooks Gabriel, Chief Medical Officer of Solid Biosciences (SLDB), had performance stock units (PSUs) and restricted stock units (RSUs) convert to common stock following a performance milestone. A portion of the resulting shares — 28,335 shares — were sold in the open market on Feb 2, 2026 for total gross proceeds of $182,390 (weighted average price $6.44) to cover tax withholding. Several derivative transactions (exercises/conversions and grants) are reported on Jan 29 and Jan 31, 2026 reflecting the vesting/conversion activity.

Key Details

• Primary sale: 28,335 shares sold on 2026-02-02; weighted average price $6.44; proceeds $182,390. Sales executed across prices $6.295–$6.580. (F5)
• Conversions/exercises: PSUs/RSUs and option-related entries reported on 2026-01-29 and 2026-01-31 (multiple line items showing conversions/exercises and grants). PSUs/RSUs convert one-for-one to common stock. (F1, F3)
• Reason for sale: Sell-to-cover to satisfy tax withholding after PSU vesting; not a discretionary trade (automated sell-to-cover instruction adopted Aug 15, 2024). (F4)
• Vesting trigger: One performance milestone for PSUs (granted June 11, 2024) was certified met on Jan 29, 2026, causing vesting of 25% of target shares. (F6)
• Other notes: Filing references grants and vesting schedules for newly granted options and RSUs (vesting over four years). The filing also notes 4,152 shares acquired under the company ESPP on Nov 28, 2025. (F2, F7–F9)
• Filing timeliness: Report covers transactions on Jan 29–Jan 31, 2026 and was filed on Feb 2, 2026 — filed within Form 4 timing requirements (no late filing indicated).

Context

• These transactions are primarily derivative conversions (PSUs/RSUs) and a subsequent automatic sell-to-cover to pay taxes; that kind of sale is routine following vesting and does not by itself signal a discretionary decision to exit a position.
• For derivative activity: PSUs converted to RSUs/stock and certain option/award grants with multi-year vesting schedules were recorded; some of the converted shares were immediately sold to cover taxes (cashless/sell-to-cover mechanics).
• The filing does not provide an explicit aggregate total of shares owned by Dr. Gabriel after these transactions in the supplied data.