SI-BONE (SIBN) director Dunn sells small stake to cover RSU taxes

Q: What did SI-BONE (SIBN) director Jeffrey Dunn report in this Form 4?

Jeffrey Dunn reported a small share sale of 337 SI-BONE common shares. The sale was made only to cover tax withholding from vesting restricted stock units, rather than a discretionary decision to reduce his investment position.

Q: How many SI-BONE (SIBN) shares did Jeffrey Dunn sell and at what price?

Dunn sold 337 shares of SI-BONE common stock at a weighted average price of $13.1508 per share. The trades were executed between $13.00 and $13.23, as detailed in the Form 4 footnotes.

Q: Was Jeffrey Dunn’s SI-BONE (SIBN) stock sale discretionary?

No. The Form 4 states the 337-share sale was required to cover tax withholding obligations from vesting restricted stock units. It was executed as a “sell to cover” transaction and is described as not a discretionary trade by Dunn.

Q: How many SI-BONE (SIBN) shares does Jeffrey Dunn hold after this transaction?

After the reported sale, Dunn holds 9,157 shares directly , including 8,675 shares tied to restricted stock units . He also holds 80,591 shares indirectly through The Jeffrey W. Dunn Living Trust dated May 17, 2012.

Q: What does the Form 4 say about Jeffrey Dunn’s restricted stock units in SI-BONE (SIBN)?

The filing notes that Dunn’s direct holdings include 8,675 shares issuable on settlement of restricted stock units . Each restricted stock unit represents a contingent right to receive one share of SI-BONE’s common stock upon settlement.

Q: How are some of Jeffrey Dunn’s SI-BONE (SIBN) shares held?

80,591 SI-BONE shares are held indirectly by The Jeffrey W. Dunn Living Trust dated May 17, 2012. The Form 4 footnotes specify that these shares are owned through the trust rather than being directly registered in Dunn’s name.

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

SI-BONE, Inc. director Jeffrey W. Dunn reported a small, non-discretionary share sale tied to taxes. On May 4, 2026, a total of 337 shares of Common Stock were sold at a weighted average price of $13.1508 solely to cover tax withholding obligations from the vesting of restricted stock units under a “sell to cover” arrangement. Following this transaction, Dunn holds 9,157 shares directly, which include 8,675 shares issuable upon settlement of restricted stock units, and 80,591 shares indirectly through The Jeffrey W. Dunn Living Trust.

Insider Trade Summary

Net Seller: 337 shares ($4,432)

Net Sell 2 txns

Insider DUNN JEFFREY W

Role null

Sold 337 shs ($4K)

Type	Security	Shares	Price	Value
Sale	Common Stock	337	$13.1508	$4K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 9,157 shares (Direct, null); Common Stock — 80,591 shares (Indirect, by Trust)

Footnotes (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. This transaction was executed in multiple trades at prices ranging from $13.00 USD to $13.23 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. Includes 8,675 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. Reflects the transfer of shares from the Reporting Person to The Jeffrey W. Dunn Living Trust dated May 17, 2012. Shares held by The Jeffrey W. Dunn Living Trust Dated May 17, 2012.

Key Figures

Shares sold for tax withholding: 337 shares Weighted average sale price: $13.1508 per share Direct holdings after transaction: 9,157 shares +2 more

5 metrics

Shares sold for tax withholding 337 shares Open-market sale on May 4, 2026 to cover RSU taxes

Weighted average sale price $13.1508 per share Sale price for 337 SI-BONE common shares

Direct holdings after transaction 9,157 shares Common stock directly held by Dunn after May 4, 2026 sale

Indirect trust holdings 80,591 shares Shares held by The Jeffrey W. Dunn Living Trust

Restricted stock units included 8,675 shares Shares issuable upon settlement of restricted stock units

Key Terms

restricted stock units, sell to cover, weighted average sale price, Living Trust

4 terms

restricted stock units financial

"Includes 8,675 shares issuable on the settlement of restricted stock units granted"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

sell to cover financial

"tax withholding obligations to be funded by a "sell to cover" transaction"

Sell to cover is when a person who receives company stock through options or awards sells just enough shares immediately to pay required taxes, exercise costs, or fees, keeping the rest. Think of it like cashing part of a bonus to cover the tax bill so you can keep the remainder. For investors, it can create predictable small selling pressure and slightly change the number of shares actually held by insiders without increasing long‑term dilution.

weighted average sale price financial

"the price reported above reflects the weighted average sale price"

Living Trust financial

"The Jeffrey W. Dunn Living Trust dated May 17, 2012"

Form 4 Insider Transactions: What Each Field Means →

05/05/2026 - 05:06 PM

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
Estimated average burden
hours per response:			0.5

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^*

DUNN JEFFREY W

(Last)

(First)

(Middle)

C/O SI-BONE, INC.

471 EL CAMINO REAL, SUITE 101

(Street)

SANTA CLARA

CALIFORNIA

95050

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
SI-BONE, Inc. [ SIBN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	10% Owner
	Officer (give title below)	Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/04/2026		S⁽¹⁾		337	D	$13.1508⁽²⁾	9,157⁽³⁾	D
Common Stock								80,591⁽⁴⁾	I	by Trust⁽⁵⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 $13.00 USD to $13.23 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 8,675 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.

4. Reflects the transfer of shares from the Reporting Person to The Jeffrey W. Dunn Living Trust dated May 17, 2012.

5. Shares held by The Jeffrey W. Dunn Living Trust Dated May 17, 2012.

Remarks:

	/s/ Michael A. Pisetsky, Attorney-in-Fact for Jeffrey W. Dunn	05/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What did SI-BONE (SIBN) director Jeffrey Dunn report in this Form 4?

Jeffrey Dunn reported a small share sale of 337 SI-BONE common shares. The sale was made only to cover tax withholding from vesting restricted stock units, rather than a discretionary decision to reduce his investment position.

How many SI-BONE (SIBN) shares did Jeffrey Dunn sell and at what price?

Dunn sold 337 shares of SI-BONE common stock at a weighted average price of $13.1508 per share. The trades were executed between $13.00 and $13.23, as detailed in the Form 4 footnotes.

Was Jeffrey Dunn’s SI-BONE (SIBN) stock sale discretionary?

No. The Form 4 states the 337-share sale was required to cover tax withholding obligations from vesting restricted stock units. It was executed as a “sell to cover” transaction and is described as not a discretionary trade by Dunn.

How many SI-BONE (SIBN) shares does Jeffrey Dunn hold after this transaction?

After the reported sale, Dunn holds 9,157 shares directly, including 8,675 shares tied to restricted stock units. He also holds 80,591 shares indirectly through The Jeffrey W. Dunn Living Trust dated May 17, 2012.

What does the Form 4 say about Jeffrey Dunn’s restricted stock units in SI-BONE (SIBN)?

The filing notes that Dunn’s direct holdings include 8,675 shares issuable on settlement of restricted stock units. Each restricted stock unit represents a contingent right to receive one share of SI-BONE’s common stock upon settlement.

How are some of Jeffrey Dunn’s SI-BONE (SIBN) shares held?

80,591 SI-BONE shares are held indirectly by The Jeffrey W. Dunn Living Trust dated May 17, 2012. The Form 4 footnotes specify that these shares are owned through the trust rather than being directly registered in Dunn’s name.