X0306 4 2021-01-05 false 0001459839 SI-BONE, Inc. SIBN 0001035986 DUNN JEFFREY W C/O SI-BONE, INC. 471 EL CAMINO REAL, SUITE 101 SANTA CLARA CA 95050 true true false false Chairman, President & CEO Common Stock 2021-01-05 4 A false 126000.00 0.00 A 343878.00 D Common Stock 2021-01-05 4 S false 24745.00 28.6047 D 131195.00 I by Trust Common Stock 2021-01-05 4 S false 15255.00 29.2332 D 115940.00 I by Trust 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 beginning on January 1, 2021 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 281,931 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 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 $28.03 to $29.02, 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 these footnotes. Shares held by The Jeffrey W. Dunn Living Trust Dated May 17, 2012. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $29.03 to $29.64, 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 these footnotes. /s/ Michael A. Pisetsky, Attorney-in-Fact for Jeffrey W. Dunn 2021-01-07