PISETSKY MICHAEL A. 4

What Happened
Michael A. Pisetsky, SVP, Operations & Administration and Chief Legal Officer of SI-BONE (SIBN), was granted restricted stock units (RSUs) on 2026-02-16 totaling 78,294 RSUs (58,720 + 9,787 + 9,787). On 2026-02-17 he sold 20,756 shares in multiple open-market trades at weighted-average prices of roughly $15.31–$15.41 per line, generating aggregate proceeds of approximately $318,643. The sales were to satisfy tax-withholding obligations in connection with RSU vesting (a "sell-to-cover"), not discretionary stock sales.

Key Details

• Transaction dates: RSU grants on 2026-02-16; sales on 2026-02-17; Form 4 filed 2026-02-18 (filed timely).
• Sales: 2,556 @ $15.39 ($39,336); 3,296 @ $15.41 ($50,806); 1,481 @ $15.32 ($22,688); 11,569 @ $15.34 ($177,428); 1,854 @ $15.31 ($28,385). Total proceeds ≈ $318,643.
• Trade price ranges: executed in multiple trades with reported price ranges approximately $15.13–$15.64 across the transactions (weighted averages shown on the Form).
• RSU vesting: One award vests over four years beginning Feb 15, 2026 with quarterly installments (time-based); other award(s) vest over three years subject to total shareholder return (TSR) performance vs. peers (performance-based).
• Tax withholding: The sales were made to cover tax-withholding on vested RSUs (footnote indicates "sell to cover"), not a discretionary sale.
• Holdings note: Form indicates 157,176 shares are issuable on settlement of RSUs (reported as includable in holdings).
• Timeliness: Filed within the Form 4 reporting window (not late).

Context
RSUs are awards that convert to shares if/when they vest; time-based RSUs vest on a schedule, performance RSUs vest only if performance goals are met. A "sell-to-cover" is common when insiders sell just enough shares at vesting to pay taxes and does not necessarily indicate a view on the company’s prospects.