SEC Form 4 
FORM 4	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 	  
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	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).			
1. Name and Address of Reporting Person*
RECUPERO ANTHONY J	

(Last)	(First)	(Middle)	
C/O SI-BONE, INC.	
471 EL CAMINO REAL, SUITE 101	

(Street) 
SANTA CLARA	CA	95050	

(City)	(State)	(Zip)	
	2. Issuer Name and Ticker or Trading Symbol 
SI-BONE, Inc. [ SIBN ] 	5. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
	Director		10% Owner	
X	Officer (give title below)		Other (specify below)	
Chief Commercial Officer	
		
	3. Date of Earliest Transaction (Month/Day/Year)
04/15/2019 		
	4. 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 Acquired, Disposed of, or Beneficially Owned	
1. Title of Security (Instr. 3) 	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8) 	4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 	5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	7. Nature of Indirect Beneficial Ownership (Instr. 4) 	
			Code	V	Amount	(A) or (D)	Price				
Common Stock	04/15/2019		M		1,000	A	$4.32 	20,700(1) 	D		
Common Stock	04/15/2019		S(2) 		1,000	D	$17.0237(3) 	19,700(1) 	D		
Common Stock	04/15/2019		S(4) 		427	D	$16.5455(5) 	19,273(1) 	D		
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 3) 	2. Conversion or Exercise Price of Derivative Security 	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8) 	5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 	6. Date Exercisable and Expiration Date (Month/Day/Year)	7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 	8. Price of Derivative Security (Instr. 5) 	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	11. Nature of Indirect Beneficial Ownership (Instr. 4) 	
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares					
Stock Option (right to buy)	$4.32 	04/15/2019		M			1,000	(6) 	07/26/2026	Common Stock	1,000	$0.00 	124,590	D		
Explanation of Responses:	
1. Includes 18,469 shares issuable on settlement of restricted stock units granted to the Reporting Person. Each restricted stock unit represents a contingent right to receive one shares of the Issuer's common stock.	
2. The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan.	
3. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $16.69 to $17.45, 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 footnotes 3 and 5.	
4. The sale reported on this Form 4 represents shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. The sale satisfies the tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.	
5. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $16.40 to $16.59, inclusive.	
6. The shares subject to the option vest as to 25% on the 12-month anniversary of July 5, 2016, and 1/36th of the balance of the shares vest each month thereafter, subject to Reporting Person's continued service through each relevant vesting date.	
Remarks:	
	
	/s/ Michael A. Pisetsky, Attorney-in-Fact for Anthony J. Recupero	04/17/2019	
	** 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 4 (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.