SI-BONE CFO sells shares to cover RSU taxes

SI-BONE, Inc. Chief Financial Officer Anshul Maheshwari reported two open-market sales of common stock that were executed solely to cover tax withholding from vested restricted stock units.

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Rhea-AI Filing Summary

SI-BONE, Inc. Chief Financial Officer Anshul Maheshwari reported two open-market sales of common stock that were executed solely to cover tax withholding from vested restricted stock units. The transactions totaled 4,666 shares, sold at weighted average prices of $14.6545 and $14.7132 per share.

A footnote explains these were mandatory "sell to cover" trades and not discretionary sales. Another footnote notes 1,395 shares acquired under the 2018 Employee Stock Purchase Plan and 183,921 shares issuable upon settlement of outstanding restricted stock units, indicating a substantial remaining equity position tied to future vesting.

Insider Trade Summary

Net Seller: 4,666 shares

Net Sell 2 txns

Insider Maheshwari Anshul

Role Chief Financial Officer

Sold 4,666 shs ($69K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,477	$14.7132	$36K
Sale	Common Stock	2,189	$14.6545	$32K

Holdings After Transaction: Common Stock — 259,877 shares (Direct)

Footnotes (4)

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.
F2. This transaction was executed in multiple trades at prices ranging from $14.35 USD to $14.84 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.
F3. Includes 1,395 shares acquired under the SI-BONE, Inc 2018 Employee Stock Purchase Plan on May 15, 2026.
F4. Includes 183,921 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

Shares sold (block 1): 2,189 shares Price per share (block 1): $14.6545 per share Shares sold (block 2): 2,477 shares +4 more

7 metrics

Shares sold (block 1) 2,189 shares Open-market sale of common stock at weighted average price $14.6545

Price per share (block 1) <money>$14.6545</money> per share Weighted average sale price for 2,189-share transaction

Shares sold (block 2) 2,477 shares Open-market sale of common stock at weighted average price $14.7132

Price per share (block 2) <money>$14.7132</money> per share Weighted average sale price; individual trades $14.35–$14.84

Total shares sold 4,666 shares Combined net-sell shares reported in transaction summary

RSUs outstanding 183,921 shares Shares issuable upon settlement of restricted stock units

ESPP acquisition 1,395 shares Shares acquired under 2018 Employee Stock Purchase Plan on May 15, 2026

Key Terms

sell to cover, restricted stock units, weighted average sale price, Employee Stock Purchase Plan, +1 more

5 terms

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.

restricted stock units financial

"in connection with the 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

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

Employee Stock Purchase Plan financial

"acquired under the SI-BONE, Inc 2018 Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

contingent right financial

"Each restricted stock unit represents a contingent right to receive one share"

FAQ

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

What insider transaction did SI-BONE (SIBN) report for its CFO?

SI-BONE reported that CFO Anshul Maheshwari sold 4,666 shares of common stock. Footnotes state these sales were required to cover tax withholding from vested restricted stock units, characterizing them as routine “sell to cover” trades rather than discretionary open-market sales.

How many SI-BONE (SIBN) shares did the CFO sell and at what prices?

The CFO sold 2,189 shares at a weighted average price of $14.6545 and 2,477 shares at $14.7132. A footnote adds that one transaction involved multiple trades between $14.35 and $14.84, with the reported price reflecting the weighted average.

Why did SI-BONE (SIBN) CFO Anshul Maheshwari sell shares in this Form 4?

Footnotes explain the sales were required to cover tax withholding obligations on the vesting of restricted stock units. The trades were structured as “sell to cover” transactions, meaning they were executed to pay taxes and are not considered discretionary investment decisions by the CFO.

Were the SI-BONE (SIBN) CFO’s stock sales discretionary or pre-arranged?

The filing states the sales were made to satisfy tax withholding obligations through a “sell to cover” transaction. It explicitly notes the activity does not represent a discretionary trade by the reporting person, framing the transactions as mechanical tax-related events rather than elective portfolio changes.

What ongoing equity exposure does the SI-BONE (SIBN) CFO retain?

A footnote indicates 183,921 shares are issuable upon settlement of restricted stock units granted to the CFO. Each unit represents a contingent right to receive one share of common stock, so future vesting could significantly increase his direct share ownership over time, subject to continued service and plan terms.

Did the SI-BONE (SIBN) CFO recently acquire additional shares outside this sale?

Yes. One footnote states the total includes 1,395 shares acquired under the SI-BONE, Inc. 2018 Employee Stock Purchase Plan on May 15, 2026. This plan-based purchase adds to his equity exposure alongside existing restricted stock units and remaining common stock holdings.

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Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 05/20/2026 - 04:28 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^*

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 Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

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	05/18/2026		S⁽¹⁾		2,477	D	$14.7132⁽²⁾	260,671	D
Common Stock	05/18/2026		S⁽¹⁾		2,189	D	$14.6545⁽²⁾	259,877⁽³⁾⁽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)
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 $14.35 USD to $14.84 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 1,395 shares acquired under the SI-BONE, Inc 2018 Employee Stock Purchase Plan on May 15, 2026.

4. Includes 183,921 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	05/20/2026
	** 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