X0306 4 2019-04-15 0 0001459839 SI-BONE, Inc. SIBN 0001754350 Reiley Mark A C/O SI-BONE, INC. 471 EL CAMINO REAL, SUITE 101 SANTA CLARA CA 95050 1 0 0 0 Common Stock 2019-04-15 4 S 0 10000 16.9459 D 513180 D Common Stock 19444 I By Trust 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 $16.57 to $17.40, 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. /s/ Michael A. Pisetsky, Attorney-in-Fact for Mark A. Reiley 2019-04-17