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

SI-BONE (NASDAQ: SIBN) CFO sells 16,975 shares at $19.55 and $20.02

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

Rhea-AI Filing Summary

SI-BONE, Inc. (SIBN) insider Anshul Maheshwari, Chief Op & Financial Officer, reported open-market sales of company common stock under a Rule 10b5-1 trading plan dated December 17, 2025. He sold 5,747 shares on August 19, 2026 at a weighted-average price of $19.55 and 11,228 shares on August 21, 2026 at a weighted-average price of $20.02, for total reported sales of 16,975 shares. Following these transactions, his direct holdings include 167,604 shares issuable upon settlement of restricted stock units.

Positive

  • None.

Negative

  • None.
Insider Maheshwari Anshul
Role Chief Op & Financial Officer
Sold 16,975 shs ($337K)
Type Security Shares Price Value
Sale Common Stock F1, F3, F4 11,228 $20.02 $225K
Sale Common Stock F1, F2 5,747 $19.55 $112K
Holdings After Transaction: Common Stock — 234,920 shares (Direct)
Footnotes (4)
  1. F1. The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan dated December 17, 2025.
  2. F2. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $19.50 to $19.67, inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder 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 these footnotes.
  3. F3. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $20.00 to $20.05, inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder 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 these footnotes.
  4. F4. Includes 167,604 shares issuable on settlement of restricted stock units granted to the Reporting Person. Each restricted stock unit represents a contingent right to receive one shares of the Issuer's common stock.
Shares sold 2026-08-19 5,747 shares Open-market sale of common stock at weighted-average price
Weighted-average sale price 2026-08-19 $19.55 per share Multiple transactions ranging from $19.50 to $19.67
Shares sold 2026-08-21 11,228 shares Open-market sale of common stock at weighted-average price
Weighted-average sale price 2026-08-21 $20.02 per share Multiple transactions ranging from $20.00 to $20.05
Total shares sold 16,975 shares Sum of reported sales on August 19 and 21, 2026
Restricted stock units held 167,604 shares Shares issuable upon settlement of restricted stock units after transactions
10b5-1 plan date December 17, 2025 Date of trading plan under which the sales were effected
Rule 10b5-1 trading plan regulatory
"The sale reported on this Form 4 was effected 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.
weighted-average price financial
"The price reported in column 4 is a weighted-average price."
Weighted-average price is the average of multiple prices where each price is counted according to its size or importance—larger trades carry more weight than smaller ones, like averaging course grades by credit hours. It matters to investors because it gives a more realistic picture of the true price paid or received, helping assess trade execution, compare performance, calculate cost basis, and value positions more accurately than a simple average.
restricted stock units financial
"Includes 167,604 shares issuable on settlement of restricted stock units granted"
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 shares"

FAQ

What insider transactions did SI-BONE (SIBN) disclose for Anshul Maheshwari?
Anshul Maheshwari, Chief Op & Financial Officer of SI-BONE, reported selling a total of 16,975 shares of common stock in two open-market transactions on August 19 and 21, 2026, as disclosed in the Form 4.

At what prices were the SI-BONE (SIBN) shares sold by Anshul Maheshwari?
The filing reports weighted-average sale prices: $19.55 per share on August 19, 2026, for 5,747 shares, and $20.02 per share on August 21, 2026, for 11,228 shares. Each sale occurred in multiple transactions within disclosed price ranges.

Were the SI-BONE (SIBN) insider sales made under a Rule 10b5-1 plan?
Yes. The Form 4 states that the sales reported were effected pursuant to a Rule 10b5-1 trading plan dated December 17, 2025, indicating they were pre-arranged under that plan.

How many SI-BONE (SIBN) shares does Anshul Maheshwari still hold after these transactions?
After the reported sales, his direct holdings include 167,604 shares issuable upon settlement of restricted stock units, with each restricted stock unit representing a contingent right to receive one share of common stock.

What price ranges applied to the SI-BONE (SIBN) insider sales?
For the August 19, 2026 sale, shares were sold in multiple transactions between $19.50 and $19.67. For the August 21, 2026 sale, shares were sold between $20.00 and $20.05, with each day’s reported price being a weighted average.

What role does Anshul Maheshwari hold at SI-BONE (SIBN)?
The Form 4 identifies Anshul Maheshwari as Chief Op & Financial Officer of SI-BONE, Inc., making him a reporting officer for insider transactions in the company’s securities.

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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).
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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Op & Financial Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/19/2026		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 Stock08/19/2026S(1)5,747D$19.55(2)246,148D
Common Stock08/21/2026S(1)11,228D$20.02(3)234,920(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 was effected pursuant to a 10b5-1 trading plan dated December 17, 2025.
2. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $19.50 to $19.67, inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder 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 these footnotes.
3. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $20.00 to $20.05, inclusive. The Reporting Person undertakes to provide the Issuer, any securityholder 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 these footnotes.
4. Includes 167,604 shares issuable on settlement of restricted stock units granted to the Reporting Person. Each restricted stock unit represents a contingent right to receive one shares of the Issuer's common stock.
Remarks:
/s/ Michael Pisetsky, Attorney-in-Fact for Anshul Maheshwari08/21/2026
** 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