X0306 4 2020-12-02 false 0001459839 SI-BONE, Inc. SIBN 0001296771 Freund John Gordon C/O SKYLINE VENTURES 525 UNIVERSITY AVENUE, SUITE 1350 PALO ALTO CA 94301 true false false false Common Stock 2020-12-02 4 S false 100000.00 23.2848 D 1529932.00 I By Skyline Venture Partners V, LP Common Stock 2020-12-03 4 S false 47886.00 23.393 D 1482046.00 I By Skyline Venture Partners V, LP Common Stock 100570.00 I By John Freund Family Partnership IV, L.P The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $22.45 to $23.43, 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. Shares held by 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. Reporting Person, a member of Issuer's board of directors, is a managing director of LLC and may be deemed to have voting and investment power with respect to the securities held by SVP V. Reporting Person disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $22.95 to $23.6950, 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. Reflects a previous pro rata distribution by Skyline Venture Partners V, L.P. ("SVP V") of 500,000 shares, for no consideration. Includes shares acquired in a pro rata distribution from Skyline Venture Partners V, L.P. Shares held by John Freund Family Partnership IV, L.P. ("Family LP"). Reporting Person, a member of Issuer's board of directors, is a general partner of Family LP and may be deemed to have voting and investment power with respect to the securities held by Family LP. Reporting Person disclaims beneficial ownership of such securities, except to the extent of his pecuniary interest therein. /s/ Michael A. Pisetsky, Attorney-in-Fact for John G. Freund 2020-12-04