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  4. [Form 4] SI-BONE, Inc. Insider Trading Activity

SI-BONE (NASDAQ: SIBN) CFO holds 167,604 RSU shares after tax sales

Filing Impact
(Neutral)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

SI-BONE, Inc. (SIBN) reported that its Chief Financial Officer, Anshul Maheshwari, sold a total of 4,665 shares of common stock on 2026-08-17 in two open-market transactions. Footnotes state these were “sell to cover” sales to satisfy tax withholding on vesting restricted stock units, described as non-discretionary. Following these transactions, Maheshwari’s holdings include 167,604 shares issuable upon settlement of restricted stock units.

Positive

  • None.

Negative

  • None.
Insider Maheshwari Anshul
Role Chief Financial Officer
Sold 4,665 shs ($87K)
Type Security Shares Price Value
Sale Common Stock F1, F2 2,476 $18.6798 $46K
Sale Common Stock F1, F3, F4 2,189 $18.6224 $41K
Holdings After Transaction: Common Stock — 251,895 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 $18.54 USD to $18.79 USD; the price reported above reflects the weighted average sale price.
  3. F3. This transaction was executed in multiple trades at prices ranging from $18.515 USD to $18.73 USD; the price reported above reflects the weighted average sale price.
  4. F4. Includes 167,604 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.
Shares sold (first transaction) 2,476 shares Common stock sold on 2026-08-17 at a weighted average price of $18.6798
Price per share (first transaction) $18.6798 Weighted average sale price for 2,476 common shares sold on 2026-08-17
Shares sold (second transaction) 2,189 shares Common stock sold on 2026-08-17 at a weighted average price of $18.6224
Price per share (second transaction) $18.6224 Weighted average sale price for 2,189 common shares sold on 2026-08-17
Total shares sold 4,665 shares Aggregate net shares sold in the reported transactions, all on 2026-08-17
RSU-related shares outstanding 167,604 shares Shares issuable upon settlement of restricted stock units held by the reporting person
sell to cover financial
"The sale satisfies the 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
"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"

FAQ

What insider transactions did SIBN CFO Anshul Maheshwari report on this Form 4?
On 2026-08-17, SIBN CFO Anshul Maheshwari reported selling a total of 4,665 shares of SI-BONE common stock in two open-market transactions. The trades are reported as non-derivative sales of common stock held directly.

Were the recent SIBN insider stock sales by the CFO discretionary trades?
The filing states the sales were required to cover tax withholding from vesting restricted stock units under a “sell to cover” arrangement. It explicitly notes they do not represent discretionary trades by the reporting person.

At what prices did the SIBN CFO sell shares on 2026-08-17?
Maheshwari sold 2,476 shares at a weighted average price of $18.6798 and 2,189 shares at a weighted average price of $18.6224. Each transaction was executed in multiple trades within disclosed intraday price ranges.

What was the total number of SIBN shares sold by the CFO for tax withholding purposes?
Across two transactions, the SIBN CFO sold 4,665 shares of common stock. A footnote explains these shares were sold solely to cover tax withholding obligations associated with the vesting of restricted stock units.

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

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/17/2026S(1)2,476D$18.6798(2)254,084D
Common Stock08/17/2026S(1)2,189D$18.6224(3)251,895(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 $18.54 USD to $18.79 USD; the price reported above reflects the weighted average sale price.
3. This transaction was executed in multiple trades at prices ranging from $18.515 USD to $18.73 USD; the price reported above reflects the weighted average sale price.
4. Includes 167,604 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 Maheshwari08/18/2026
** Signature of Reporting PersonDate
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