SI-BONE, Inc. — Director's Dealing 2018

Oct 16, 2018

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: SI-BONE, Inc. (SIBN)
CIK: 0001459839
Period of Report: 2018-10-16

Reporting Person: Bonita David P (Director)

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Series 6 Preferred Stock	$		Common Stock (572326)		Indirect
Series 7 Preferred Stock	$		Common Stock (179404)		Indirect
Stock Option (right to buy)	$5.94	2027-03-01	Common Stock (22222)		Direct

Footnotes

F1: The Issuer's Series 6 Preferred Stock will automatically convert into approximately 1.05878 shares of Issuer's common stock immediately upon the closing of the Issuer's initial public offering and has no expiration date.

F2: Shares held by OrbiMed Private Investments V, LP. ("OPI V"). OrbiMed
Capital GP V LLC ("GP V") is the general partner of OPI V and OrbiMed Advisors LLC ("OrbiMed Advisors") is the managing member of GP V. By virtue of such relationships, GP V and OrbiMed Advisors may be deemed to have voting and investment power with respect to the shares held by OPI V and as a result may be deemed to have have beneficial ownership of such shares. Reporting Person, a member of the Issuer's board of directors, is an employee of OrbiMed Advisors.

F3: Each of GP V, OrbiMed Advisors and the Reporting Person disclaims beneficial ownership of the securities reported herein for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), except to the extent of its or his pecuniary interest therein, if any. This report shall not be deemed an admission that any such entity or person is a beneficial owner of such securities for purpose of Section 16 of the Exchange Act, or for any other purpose.

F4: The Issuer's Series 7 Preferred Stock will automatically convert into an equal number of shares of Issuer's common stock immediately upon the closing of the Issuer's initial public offering and has no expiration date.

F5: The shares subject to the option vest in equal monthly installments over three years commencing on the closing date of the Issuer's initial public offering, subject to Reporting Person's continued service through each relevant vesting date.