SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response: 0.5

1. Name and Address of Reporting Person* Bonita David P (Last) (First) (Middle) C/O SI-BONE, INC. 471 EL CAMINO REAL, SUITE 101 (Street) SANTA CLARA CA 95050 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 10/16/2018	3. Issuer Name and Ticker or Trading Symbol SI-BONE, Inc. [ SIBN ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Series 6 Preferred Stock	(1)	(1)	Common Stock	572,326	(1)	I	By OrbiMed Private Investments V, LP(2)(3)
Series 7 Preferred Stock	(4)	(4)	Common Stock	179,404	(4)	I	By OrbiMed Private Investments V, LP(2)(3)
Stock Option (right to buy)	(5)	03/01/2027	Common Stock	22,222	5.94	D

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Michael A. Pisetsky, Attorney-in-Fact for David P. Bonita	10/16/2018
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

POWER OF ATTORNEY
Know all by these presents, that the undersigned hereby constitutes and appoints
each of LAURA A. FRANCIS, MICHAEL A. PISETSKY, MATTHEW B. HEMINGTON and JOHN T.
MCKENNA, signing individually, the undersigned's true and lawful attorneys-in
fact and agents to:
(1)	execute for and on behalf of the undersigned, in the undersigned's capacity
as an officer, director or beneficial owner of more than 10% of a registered
class of securities of SI-BONE, INC. (the "Company"), Forms 3, 4 and 5
(including any amendments thereto) in accordance with Section 16(a) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act") and the rules
thereunder and a Form ID, Uniform Application for Access Codes to File on EDGAR;

(2)	do and perform any and all acts for and on behalf of the undersigned that
may be necessary or desirable to execute such Forms 3, 4 or 5 or Form ID
(including any amendments thereto) and timely file such forms with the United
States Securities and Exchange Commission and any stock exchange or similar
authority; and
(3)	take any other action of any nature whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit, in
the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's discretion.
The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Exchange Act.
This Power of Attorney shall remain in full force and effect until the earliest
to occur of (a) the undersigned is no longer required to file Forms 3, 4 and 5
with respect to the undersigned's holdings of and transactions in securities
issued by the Company, (b) revocation by the undersigned in a signed writing
delivered to the foregoing attorneys-in-fact or (c) as to any attorney-in-fact
individually, until such attorney-in-fact is no longer employed by the Company
or Cooley LLP.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of October 16, 2018.

/s/ David P. Bonita
David P. Bonita