X0306 4 2019-08-21 false 0001459839 SI-BONE, Inc. SIBN 0001419187 Skyline Venture Partners V LP 525 UNIVERSITY AVENUE, SUITE 1350 PALO ALTO CA 94301 false false true false 0001434887 Skyline Venture Management V, LLC 525 UNIVERSITY AVENUE, SUITE 1350 PALO ALTO CA 94301 false false true false Common Stock 2019-08-21 4 S false 27067.00 20.1367 D 3992918.00 I By Skyline Venture Partners V, L.P Common Stock 2019-08-21 4 S false 18144.00 20.1729 D 3974774.00 I By Skyline Venture Partners V, L.P Common Stock 2019-08-22 4 S false 2185.00 20.049 D 3972589.00 I By Skyline Venture Partners V, L.P Common Stock 2019-08-23 4 S false 180.00 20.03 D 3972409.00 I By Skyline Venture Partners V, L.P The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $20.05 to $20.21, 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 Skyline Venture Partners V, L.P. ("SVP V"). Skyline Venture Management V, LLC ("LLC") is the general partner of SVP V and as such may be deemed to have voting and investment power with respect to the securities of SVP V. Dr. Freund, a member of the Issuer's board of directors, together with Yasunori Kaneko, are the managing directors of LLC and each may be deemed to have voting and investment power with respect to the securities held by SVP V. Dr. Freund and Mr. Kaneko disclaim beneficial ownership of such securities, except to the extent of their pecuniary interest therein. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $20.02 to $20.26, inclusive. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $20.02 to $20.18, inclusive. Skyline Venture Partners V, L.P., By: Skyline Venture Management V, LLC, Its: General Partner, By: /s/ Michael A. Pisetsky , Attorney-in-Fact 2019-08-23 Skyline Venture Management V, LLC, By: /s/ Michael A. Pisetsky, Attorney-in-Fact 2019-08-23