[Form 4] SI-BONE, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Michael A. Pisetsky, SVP, Ops & Adm and Chief Legal Officer of SI-BONE, Inc. (SIBN), reported sales on 08/18/2025 that were executed to satisfy tax withholding obligations on vesting restricted stock units through a "sell-to-cover" process. The filing shows two non-derivative dispositions: 1,851 shares sold at a weighted-average price of $15.6524 and 1,478 shares sold at a weighted-average price of $15.6171, with transaction prices ranging from $15.49 to $15.80. After these transactions the reporting person beneficially owned 258,352 shares. The filing discloses that 138,504 of those shares are issuable upon settlement of restricted stock units, each representing a contingent right to one share.

Positive

• Sale designated as "sell-to-cover" indicating the transactions were for tax withholding on RSU vesting, not discretionary insider selling
• Transparent price disclosure including weighted-average prices and provided range ($15.49–$15.80) with offer to supply per-trade details on request
• Beneficial ownership reported clearly, including the number of shares issuable upon RSU settlement (138,504)

Negative

• None.

Insights

Financial Analyst

TL;DR: Routine sell-to-cover tax withholding; limited market impact and no change to insider's overall stake beyond RSU settlement.

The reported transactions are non-discretionary sales to satisfy tax withholding tied to RSU vesting, not open-market liquidity trades. Total reported dispositions equal 3,329 shares executed across multiple trades at prices between $15.49 and $15.80. The insider's beneficial ownership after the trades is 258,352 shares, including 138,504 shares issuable on settlement of RSUs. These facts indicate the activity is administrative and not necessarily informative about management's view of company prospects. From a financial-materiality perspective, the volumes and dollar values are small relative to a typical public float and unlikely to affect valuation or market dynamics materially.

Corporate Governance Expert

TL;DR: Compliance-driven insider sale consistent with standard post-vesting tax procedures; disclosure appears complete.

The Form 4 specifies the sales were executed to cover tax withholding obligations associated with RSU vesting and documents the price range and weighted-average prices. The filer offers to provide details of individual trade prices on request, which supports transparency. Beneficial ownership reporting includes both currently owned shares and those issuable upon RSU settlement, aligning with disclosure norms. No departures from expected governance or reporting practices are evident in the filing.

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

OMB APPROVAL

OMB Number:			3235-0287
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X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

PISETSKY MICHAEL A.

(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)
	SVP, Ops & Adm/Chief Legal Ofr

3. Date of Earliest Transaction (Month/Day/Year)
08/18/2025

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	08/18/2025		S(1)		1,851	D	$15.6524(2)	259,830	D
Common Stock	08/18/2025		S(1)		1,478	D	$15.6171(2)	258,352(3)	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

Explanation of Responses:

1. 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.

2. This transaction was executed in multiple trades at prices ranging from $15.49 USD to $15.80 USD; the price reported above reflects the weighted average sale price. The Reporting Person undertakes to provide Issuer, any security holder 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 this footnote.

3. Includes 138,504 shares issuable on the settlement of restricted stock units granted to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

Remarks:

	/s/ Michael A. Pisetsky	08/20/2025
	** 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.

FAQ

What did SI-BONE insider Michael Pisetsky sell on 08/18/2025 (SIBN)?

He sold a total of 3,329 shares in two non-derivative transactions (1,851 and 1,478 shares) to satisfy tax withholding on vested RSUs.

At what prices were the SIBN shares sold in this Form 4?

Trades were executed at prices ranging from $15.49 to $15.80; the reported weighted-average prices were $15.6524 and $15.6171.

How many SI-BONE shares does Michael Pisetsky beneficially own after the reported transactions?

The Form 4 reports beneficial ownership of 258,352 shares following the reported sales.

How many shares are issuable upon settlement of Michael Pisetsky's RSUs?

The filing states 138,504 shares are issuable on settlement of restricted stock units granted to the reporting person.

Were these sales discretionary trades or administrative transactions?

The filing states the sales were to satisfy tax withholding obligations related to RSU vesting and were a "sell-to-cover" transaction, not discretionary.