X0306 4 2019-06-13 false 0001459839 SI-BONE, Inc. SIBN 0001492082 Davis Timothy E JR C/O SI-BONE, INC. 471 EL CAMINO REAL, SUITE 101 SANTA CLARA CA 95050 true false false false Stock Options (Right to buy) 17.72 2019-06-13 4 A false 15741.00 0.00 A 2029-06-12 Common Stock 15741.00 15741.00 D The shares subject to the option will vest in a series of 12 equal monthly increments over the one-year period following the Vesting Commencement Date, such that the option will be fully vested on the first anniversary of the Vesting Commencement Date, subject to the Reporting Person's continuous service as a member of the Issuer's Board of Directors on each such applicable vesting date. /s/ Michael A. Pisetsky, Attorney-in-Fact for Timothy E. Davis, Jr. 2019-06-17