DUNN JEFFREY W 4

What Happened
Jeffrey W. Dunn, a director of SI‑BONE, was granted 10,957 restricted stock units (RSUs) on 2026-06-04 (no cash paid). Following settlement/vesting activity, he sold 3,575 shares on 2026-06-05 in an open‑market transaction for a weighted average price of $15.25, generating about $54,505. The sale was executed in multiple trades at prices ranging from $15.085 to $15.42.

Key Details

• Grant: 10,957 RSUs (2026-06-04); each RSU = contingent right to one share (see vesting below). (Footnotes F1, F4)
• Sale: 3,575 shares sold (2026-06-05) at weighted avg $15.25, total ≈ $54,505; execution price range $15.085–$15.42 (F3).
• Purpose of sale: sell‑to‑cover tax withholding on RSU vesting — not a discretionary sale (F2).
• Vesting: RSUs vest 100% upon the earlier of the next annual meeting or one year from the vesting commencement date, subject to continued board service (F1).
• Net effect: of the 10,957 RSUs, 3,575 shares were sold to cover taxes, leaving 7,382 net newly acquired shares subject to settlement/vesting.
• Trust notes: filing references transfers/holdings involving The Jeffrey W. Dunn Living Trust dated May 17, 2012 (F5, F6).
• Filing: Form 4 filed 2026-06-08; filing appears timely for the reported 6/4 and 6/5 transactions.

Context
Restricted stock units are a form of compensation that convert to shares upon vesting; the reported sale was a routine sell‑to‑cover to meet tax obligations and should not be read as an independent investment decision by the director. This filing reports a compensation award plus the related tax withholding sale rather than a discretionary purchase or sale for investment purposes.