SI-BONE director exercises, sells 20K shares

Rhea-AI Filing Summary

SI-BONE, Inc. (SIBN) director Jeffrey W. Dunn reported exercising options for a total of 20,000 shares of common stock at an exercise price of $4.68 per share on September 1, 2026, and selling the same 20,000 shares at a weighted-average price of $18.908 per share pursuant to a Rule 10b5-1 trading plan. He also reports 81,073 shares held indirectly by The Jeffrey W. Dunn Living Trust and holdings that include 10,957 shares issuable upon settlement of restricted stock units.

Insider Trade Summary 10b5-1

Exercise and Sale: 20,000 shares ($285K approx. pre-tax spread)

Exercise and Sale 7 txns

Insider DUNN JEFFREY W

Role Director

Sold 20,000 shs ($378K)

Approx. gross sale proceeds $378K

Approx. exercise cost $94K

Approx. pre-tax spread $285K

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy) F5	1,367	$0.00	$0.00
Exercise	Stock Option (Right to Buy) F5	18,633	$0.00	$0.00
Exercise	Common Stock	18,633	$4.68	$87K
Exercise	Common Stock	1,367	$4.68	$6K
Sale	Common Stock F1, F2	18,633	$18.908	$352K
Sale	Common Stock F1, F2, F3	1,367	$18.908	$26K
holding	Common Stock F4	--	--	--

Holdings After Transaction: Stock Option (Right to Buy) — 86,260 contracts (Direct); Common Stock — 16,057 shares (Direct); Common Stock — 81,073 shares (Indirect, by Trust)

Footnotes (5)

1. F1. The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan dated May 7th, 2025.
2. F2. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $18.6450 to $19.6449, 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 this footnote.
3. F3. 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.
4. F4. Shares held by The Jeffrey W. Dunn Living Trust Dated May 17, 2012.
5. F5. The shares subject to the option vest in equal monthly installments over four years commencing on the vesting commencement date, subject to Reporting Person's continued service through each relevant vesting date.

Key Figures

Options exercised: 20,000 shares Option exercise price: $4.68 per share Shares sold: 20,000 shares +4 more

7 metrics

Options exercised 20,000 shares Stock options exercised on September 1, 2026

Option exercise price $4.68 per share Exercise price for the Stock Option (Right to Buy)

Shares sold 20,000 shares Common stock sold on September 1, 2026

Weighted-average sale price $18.908 per share Weighted-average price for sales between $18.6450 and $19.6449

Indirect holdings by trust 81,073 shares Common stock held by The Jeffrey W. Dunn Living Trust

RSU shares included 10,957 shares Shares issuable upon settlement of restricted stock units

Option expiration date March 1, 2027 Expiration date of the exercised stock options

Key Terms

Rule 10b5-1 trading plan, weighted-average price, restricted stock units, contingent right, +1 more

5 terms

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 10,957 shares issuable on the settlement 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.

contingent right financial

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

indirect ownership financial

"Shares held by The Jeffrey W. Dunn Living Trust Dated May 17, 2012"

FAQ

What insider transactions did SIBN director Jeffrey W. Dunn report on this Form 4?

He exercised options for 20,000 shares of SI-BONE common stock at $4.68 per share and sold 20,000 shares at a weighted-average price of $18.908 per share on September 1, 2026.

Were the SIBN stock sales by Jeffrey W. Dunn under a Rule 10b5-1 trading plan?

Yes. A footnote states the sale was effected pursuant to a Rule 10b5-1 trading plan dated May 7, 2025, indicating the transactions followed a pre-arranged trading plan.

What prices were involved in Jeffrey W. Dunn’s SIBN transactions?

The options had an exercise price of $4.68 per share. The 20,000 shares sold had a weighted-average sale price of $18.908 per share, with individual trades occurring between $18.6450 and $19.6449 per share.

How many SI-BONE shares does Jeffrey W. Dunn report holding indirectly?

He reports 81,073 shares of SI-BONE common stock held indirectly by The Jeffrey W. Dunn Living Trust Dated May 17, 2012, according to the Form 4 disclosure.

Does Jeffrey W. Dunn hold SI-BONE restricted stock units (RSUs)?

Yes. A footnote indicates his reported holdings include 10,957 shares issuable upon settlement of restricted stock units, with each unit representing a contingent right to receive one share of common stock.

What is the vesting schedule of the SI-BONE stock options mentioned?

A footnote states the option shares vest in equal monthly installments over four years starting from the vesting commencement date, subject to Jeffrey W. Dunn’s continued service through each vesting date.

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Available on EDGAR 09/03/2026 - 07:27 PM Accepted by SEC EDGAR 09/03/2026 - 07:26 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^*

DUNN JEFFREY W

(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)
09/01/2026

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	09/01/2026		M		18,633	A	$4.68	34,690	D
Common Stock	09/01/2026		M		1,367	A	$4.68	36,057	D
Common Stock	09/01/2026		S(1)		18,633	D	$18.908(2)	17,424	D
Common Stock	09/01/2026		S(1)		1,367	D	$18.908(2)	16,057(3)	D
Common Stock								81,073	I	by Trust(4)

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
Stock Option (Right to Buy)	$4.68	09/01/2026		M			1,367	(5)	03/01/2027	Common Stock	1,367	$0.00	104,893	D
Stock Option (Right to Buy)	$4.68	09/01/2026		M			18,633	(5)	03/01/2027	Common Stock	18,633	$0.00	86,260	D

Explanation of Responses:

1. The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan dated May 7th, 2025.

2. The price reported in column 4 is a weighted-average price. The shares were sold in multiple transactions ranging from $18.6450 to $19.6449, 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 this footnote.

3. 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.

4. Shares held by The Jeffrey W. Dunn Living Trust Dated May 17, 2012.

5. The shares subject to the option vest in equal monthly installments over four years commencing on the vesting commencement date, subject to Reporting Person's continued service through each relevant vesting date.

Remarks:

	/s/ Michael A. Pisetsky, Attorney-in-Fact for Jeffrey W. Dunn	09/03/2026
	** 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)