SI-BONE CFO sells 1,731 shares under trading plan

The Chief Op & Financial Officer's October 2 sales covered restricted stock unit tax withholding; the October 5 sale was under a plan dated December 17, 2025.

Rhea-AI Filing Summary

SI-BONE, Inc.'s Chief Op & Financial Officer, Anshul Maheshwari, reported three common-stock sales: 1,560 shares at $18.1674 and 1,758 shares at $18.1933 on October 2, 2026, and 1,731 shares at $19.5000 on October 5, 2026. The October 2 sales covered tax withholding obligations tied to restricted stock unit vesting; they were not discretionary and were executed in multiple trades at prices from $18.05 USD to $18.45 USD, with the reported prices reflecting weighted averages. The October 5 sale was effected under a Rule 10b5-1 trading plan dated December 17, 2025. A footnote associated with the October 5 transaction says the post-transaction amount includes 160,823 shares issuable upon settlement of restricted stock units.

Insider Trade Summary 10b5-1

Net Seller: 5,049 shares

Net Sell 3 txns

Insider Maheshwari Anshul

Role Chief Op & Financial Officer

Sold 5,049 shs ($94K)

Type	Security	Shares	Price	Value
Sale	Common Stock F3, F4	1,731	$19.50	$34K
Sale	Common Stock F1, F2	1,560	$18.1674	$28K
Sale	Common Stock F1, F2	1,758	$18.1933	$32K

Holdings After Transaction: Common Stock — 218,235 shares (Direct)

Footnotes (4)

1. F1. 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. F2. This transaction was executed in multiple trades at prices ranging from $18.05 USD to $18.45 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. F3. The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan dated December 17, 2025.
4. F4. Includes 160,823 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

Common stock sale shares: 1,560 shares Weighted average sale price: $18.1674 per share Common stock sale shares: 1,758 shares +5 more

8 metrics

Common stock sale shares 1,560 shares October 2, 2026

Weighted average sale price $18.1674 per share 1,560-share sale on October 2, 2026

Common stock sale shares 1,758 shares October 2, 2026

Weighted average sale price $18.1933 per share 1,758-share sale on October 2, 2026

October 2 sale execution price range $18.05 USD to $18.45 USD Multiple trades

Common stock sale shares 1,731 shares October 5, 2026

Sale price $19.5000 per share October 5, 2026

Shares issuable upon restricted stock unit settlement 160,823 shares Included in the post-transaction amount footnote associated with the October 5 sale

Key Terms

sell to cover, restricted stock units, weighted average sale price, Rule 10b5-1 trading plan

4 terms

sell to cover financial

"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.

restricted stock units financial

"vesting of restricted stock units"

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.

weighted average sale price financial

"reflects the weighted average sale price"

Rule 10b5-1 trading plan financial

"pursuant to a 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

FAQ

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

How many shares did SIBN's Chief Op & Financial Officer sell?

Anshul Maheshwari reported sales of 1,560 shares at $18.1674 and 1,758 shares at $18.1933 on October 2, 2026, and 1,731 shares at $19.5000 on October 5, 2026. The October 2 sales covered tax withholding obligations; the October 5 sale was under a Rule 10b5-1 trading plan dated December 17, 2025.

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

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Available on EDGAR 10/06/2026 - 07:24 PM Accepted by SEC EDGAR 10/06/2026 - 07:23 PM 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).

X

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^*

Maheshwari Anshul

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Op & Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/02/2026

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	10/02/2026		S(1)		1,560	D	$18.1674(2)	221,724	D
Common Stock	10/02/2026		S(1)		1,758	D	$18.1933(2)	219,966	D
Common Stock	10/05/2026		S(3)		1,731	D	$19.5	218,235(4)	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 $18.05 USD to $18.45 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. The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan dated December 17, 2025.

4. Includes 160,823 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 Anshul Maheshwari	10/06/2026
	** 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)