X0306 4 2020-08-10 false 0001459839 SI-BONE, Inc. SIBN 0001218802 FRANCIS LAURA C/O SI-BONE, INC. 471 EL CAMINO REAL, SUITE 101 SANTA CLARA CA 95050 false true false false Chief Financial Officer Common Stock 2020-08-10 4 M false 4029.00 4.32 A 142319.00 D Common Stock 2020-08-10 4 S false 4029.00 21.00 D 138290.00 D Stock Option (Right to Buy) 4.32 2020-08-10 4 M false 4029.00 0.00 D 2025-05-25 Common Stock 4029.00 140521.00 D The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan. Includes 86,134 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 shares of the Issuer's common stock. The shares subject to the option vest in equal monthly installments over four years commencing on May 26, 2015, subject to Reporting Person's continued service through each relevant vesting date. The shares subject to this option may be exercised prior to vesting, subject to Issuer's right to repurchase. /s/ Michael A. Pisetsky, Attorney-in-Fact for Laura A. Francis 2020-08-12