X0306 4 2021-11-16 false 0001459839 SI-BONE, Inc. SIBN 0001218802 FRANCIS LAURA C/O SI-BONE, INC. 471 EL CAMINO REAL, SUITE 101 SANTA CLARA CA 95050 true true false false Chief Executive Officer Common Stock 2021-11-16 4 S false 1020.00 21.4697 D 215943.00 D Common Stock 2021-11-16 4 S false 621.00 21.4697 D 215322.00 D Common Stock 2021-11-16 4 S false 1530.00 21.4697 D 213792.00 D Common Stock 2021-11-16 4 S false 1678.00 21.4697 D 212114.00 D Stock Options (Right to buy) 22.00 2021-10-25 4 G false 20328.00 0.00 D 2029-01-15 Common Stock 20238.00 15437.00 D The sale reported on this Form 4 represents shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. The sale satisfies the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person. Includes 119,710 shares issuable on settlement of restricted stock units granted to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. The shares subject to the option vest in equal monthly installments over four years commencing on vesting commencement date, subject to Reporting Person's continued service through each relevant vesting date. The reported transaction involves the Reporting Person's transfer of options to trusts for the benefit of Reporting Person's children. /s/ Michael A. Pisetsky, Attorney-in-Fact for Laura A. Francis 2021-11-17