X0306 4 2019-06-25 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 2019-06-25 4 M false 2518.00 4.32 A 73042.00 D Common Stock 2019-06-25 4 S false 2518.00 17.9169 D 70524.00 D Stock Option (Right to Buy) 4.32 2019-06-25 4 M false 2518.00 0.00 D 2025-05-25 Common Stock 2518.00 173728.00 D Includes 25,078 shares issuable on 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 sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $17.42 to $18.25, inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The shares subject to the option vest as to 25% on the 12-month anniversary of vesting commencement date, and 1/36th of the balance of the shares vest each month thereafter, subject to Reporting Person's continued service through each relevant vesting date. /s/ Michael A. Pisetsky, Attorney-in-Fact for Laura A. Francis 2019-06-27