SI-BONE director awarded 10,957 RSUs

Nishimura Mika reported acquisition or exercise transactions in this Form 4 filing.

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Form Type

Rhea-AI Filing Summary

Nishimura Mika reported acquisition or exercise transactions in this Form 4 filing.

SI-BONE, Inc. director Mika Nishimura received a grant of 10,957 shares of common stock in the form of restricted stock units at no cash cost. Each unit represents a right to one share and will vest 100% at the next annual stockholder meeting or one year from the vesting start date, if she remains on the Board. Following this award, she directly holds 43,673 shares, including these unvested units.

Insider Trade Summary

Grant/Award: 10,957 shares

Grant/Award 1 txn

Insider Nishimura Mika

Role Director

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

Holdings After Transaction: Common Stock — 43,673 shares (Direct)

Footnotes (2)

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.
F2. Includes 10,957 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

RSUs granted: 10,957 shares Grant price: $0.00 per share Shares after transaction: 43,673 shares +1 more

4 metrics

RSUs granted 10,957 shares Restricted stock units granted on June 4, 2026

Grant price $0.00 per share Stated transaction price for RSU award

Shares after transaction 43,673 shares Total direct holdings following RSU grant

Vesting condition 100% at next annual meeting or one year from start Requires continuous Board service until vesting date

Key Terms

restricted stock units, contingent right, vesting commencement date, Board of Directors

4 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 date one year from the Vesting Commencement Date, subject to the Reporting Person's continuous service"

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.

Board of Directors financial

"subject to the Reporting Person's continuous service as a member of the Company's Board of Directors until such date."

The Board of Directors is a group of people chosen by a company's owners to help make big decisions and oversee how the company is run. They act like a team of advisors or managers, making sure the company stays on track and meets its goals. Their choices can influence the company's success and how it grows.

FAQ

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

What did SI-BONE (SIBN) director Mika Nishimura report in this Form 4?

Mika Nishimura reported receiving 10,957 restricted stock units of SI-BONE common stock. The award is a compensation grant, carries no cash exercise price, and increases her direct holdings to 43,673 shares, including the newly granted units.

Is the SI-BONE (SIBN) Form 4 transaction a stock purchase or a grant?

The Form 4 reflects a stock grant, not an open-market purchase. Nishimura received 10,957 restricted stock units at a stated price of $0.00 per share as part of her director compensation, rather than buying shares in the market.

When do Mika Nishimura’s 10,957 SI-BONE (SIBN) restricted stock units vest?

The 10,957 restricted stock units vest 100% on the earlier of the next annual stockholder meeting or one year from the vesting commencement date. Vesting is conditioned on her continuous service on SI-BONE’s Board of Directors until that date.

How many SI-BONE (SIBN) shares does Mika Nishimura hold after this Form 4?

After this transaction, Nishimura directly holds 43,673 shares of SI-BONE common stock. This total includes 10,957 shares issuable upon settlement of restricted stock units described in the filing’s footnotes as part of her overall equity position.

What is a restricted stock unit (RSU) in the context of SI-BONE (SIBN)?

A restricted stock unit is a promise to deliver a share of common stock in the future. For SI-BONE, each RSU granted to Nishimura converts into one share when vesting conditions, such as continued Board service until the specified date, are satisfied.

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Accepted by SEC EDGAR 06/08/2026 - 05:42 PM EDT

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^*

Nishimura Mika

(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)
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	06/04/2026		A		10,957⁽¹⁾	A	$0.00	43,673⁽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)
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. 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 10,957 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 Mika Nishimura	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)

Source: View Original Filing on SEC EDGAR