X0306 4 2021-04-16 false 0001459839 SI-BONE, Inc. SIBN 0001754765 Pisetsky Michael A C/O SI-BONE, INC. 471 EL CAMINO REAL, SUITE 101 SANTA CLARA CA 95050 false true false false GC & Chief Compliance Officer Common Stock 2021-04-16 4 S false 243.00 33.6498 D 75316.00 D Common Stock 2021-04-19 4 A false 4112.00 0.00 A 79428.00 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. Reflects shares issuable on the 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 restricted stock unit will vest over four years and will be released in quarterly installments commencing on May 15, 2021, subject to the Reporting Person's continued service through each relevant vesting date. Includes 61,258 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. /s/ Michael A. Pisetsky 2021-04-20