X0306 4 2020-10-19 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 true false Common Stock 2020-10-19 4 S false 190053.00 22.00 D 2129932.00 I By Skyline Venture Partners V, L.P. Common Stock 50285.00 I By John Freund Family Partnership IV, L.P. Shares were sold in conjunction with the Issuer's public offering of common stock announced on October 14, 2020. 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. 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. Reflects 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 2020-10-20