X0306 4 2021-05-24 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 2021-05-24 4 S false 50827.00 32.5409 D 474079.00 I By Skyline Venture Partners V, LP Common Stock 2021-05-24 4 S false 200.00 32.76 D 473879.00 I By Skyline Venture Partners V, LP Common Stock 2021-05-25 4 S false 1696.00 32.5452 D 472183.00 I By Skyline Venture Partners V, LP Common Stock 2021-05-26 4 S false 17138.00 31.8493 D 455045.00 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 $32.50 to $32.65, 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 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 $32.75 to $32.77, 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. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $32.50 to $32.70, 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. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $31.55 to $32.00, 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 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 2021-05-26