SI-BONE director granted 10,957 RSUs

West Thomas A. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

West Thomas A. reported acquisition or exercise transactions in this Form 4 filing.

SI-BONE, Inc. director Thomas A. West reported receiving a grant of 10,957 shares of common stock in the form of restricted stock units at no cash cost. Following this award, he directly holds 37,947 shares, including 20,115 shares issuable upon settlement of previously granted restricted stock units.

The new restricted stock units will vest 100% on the earlier of the company’s next annual general meeting of stockholders or one year from the vesting commencement date, provided he continues to serve on the Board of Directors through that date.

Insider Trade Summary

Grant/Award: 10,957 shares

Grant/Award 1 txn

Insider West Thomas A.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	10,957	$0.00	$0.00

Holdings After Transaction: Common Stock — 37,947 shares (Direct)

Footnotes (2)

1. F1. Reflects 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. The shares subject to the restricted stock unit will vest 100% upon the earlier of (i) the next annual general meeting of the stockholders of the Company or (ii) the date one year from the Vesting Commencement Date, subject to the Reporting Person's continuous service as a member of the Company's Board of Directors until such date.
2. F2. Includes 20,115 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.

Key Figures

RSU grant size: 10,957 shares Grant price: $0.0000 per share Holdings after transaction: 37,947 shares +1 more

4 metrics

RSU grant size 10,957 shares Restricted stock units granted on 2026-06-04

Grant price $0.0000 per share Compensation grant, not a market purchase

Holdings after transaction 37,947 shares Total direct holdings following RSU grant

Previously granted RSUs 20,115 shares Shares issuable upon settlement of earlier RSU awards

Key Terms

restricted stock units, contingent right, vesting commencement date

3 terms

restricted stock units financial

"Reflects shares issuable on the settlement of restricted stock units granted to the Reporting Person."

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.

contingent right financial

"Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock."

vesting commencement date financial

"The shares subject to the restricted stock unit will vest 100% upon the earlier of ... or (ii) the date one year from the Vesting Commencement Date."

The vesting commencement date is the starting point when an employee begins earning ownership rights to their promised benefits, such as stock options or retirement contributions. Think of it like the day a savings account is opened—only after this date do the benefits start to grow and become fully available over time. It matters to investors because it marks when the clock begins ticking toward full ownership, affecting the timing and value of these benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did SI-BONE (SIBN) director Thomas A. West report in this Form 4?

Director Thomas A. West reported receiving an award of 10,957 restricted stock units of SI-BONE common stock. These units were granted at no cash cost and represent compensation tied to his Board service, subject to future vesting conditions before shares are actually delivered.

How many SI-BONE (SIBN) shares does Thomas A. West hold after this transaction?

After the grant, Thomas A. West directly holds 37,947 SI-BONE shares. This total includes 20,115 shares that are issuable upon settlement of previously granted restricted stock units, which are still subject to their respective vesting conditions before becoming fully owned shares.

How do the new restricted stock units granted to the SIBN director vest?

The 10,957 restricted stock units vest 100% on the earlier of SI-BONE’s next annual stockholder meeting or one year from the vesting commencement date. Vesting requires Thomas A. West’s continuous service on the company’s Board of Directors through the applicable vesting date.

Did the SIBN director pay cash for the 10,957-share award reported on Form 4?

No, the 10,957-share award was granted at a price of $0.0000 per share, indicating it is a compensation grant rather than a market purchase. The shares are delivered only upon vesting and settlement of the restricted stock units according to the specified vesting schedule.

What are restricted stock units (RSUs) in the context of SI-BONE (SIBN)?

For SI-BONE, restricted stock units represent a contingent right to receive one share of common stock per unit. They do not deliver shares immediately; instead, units convert into shares only upon satisfying vesting conditions such as continued Board or employee service through a future date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/08/2026 - 05:42 PM EDT Learn about SEC filing dates

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^*

West Thomas A.

(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)
06/04/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/04/2026		A		10,957(1)	A	$0.00	37,947(2)	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. Reflects 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. The shares subject to the restricted stock unit will vest 100% upon the earlier of (i) the next annual general meeting of the stockholders of the Company or (ii) the date one year from the Vesting Commencement Date, subject to the Reporting Person's continuous service as a member of the Company's Board of Directors until such date.

2. Includes 20,115 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 Pisetsky, Attorney-in-Fact for Thomas A. West	06/08/2026
	** 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)