SI-BONE (SIBN) legal chief sells 3,726 shares in tax sell-to-cover

Filing Impact

(Neutral)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

SI-BONE, Inc. senior vice president and chief legal officer Michael A. Pisetsky reported selling 3,726 shares of common stock on May 18, 2026 in open-market transactions at weighted average prices around $14.63 per share.

According to the disclosure, these sales were required to cover tax withholding obligations tied to the vesting of restricted stock units and were executed as automatic “sell to cover” transactions, not discretionary trades. He also holds 1,395 shares acquired under the 2018 Employee Stock Purchase Plan on May 15, 2026, and 143,729 shares issuable upon settlement of restricted stock units.

Insider Trade Summary

Net Seller: 3,726 shares ($54,527)

Net Sell 2 txns

Insider PISETSKY MICHAEL A.

Role SVP, Ops & Adm/Chief Legal Ofr

Sold 3,726 shs ($55K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,872	$14.6327	$27K
Sale	Common Stock	1,854	$14.6356	$27K

Holdings After Transaction: Common Stock — 280,968 shares (Direct, null)

Footnotes (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. This transaction was executed in multiple trades at prices ranging from $14.25 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. This transaction was executed in multiple trades at prices ranging from $14.22 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. Includes 1,395 shares acquired under the SI-BONE, Inc 2018 Employee Stock Purchase Plan on May 15, 2026. Includes 143,729 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

Total shares sold: 3,726 shares First sale size: 1,854 shares Second sale size: 1,872 shares +4 more

7 metrics

Total shares sold 3,726 shares Open-market sales on May 18, 2026 to cover taxes

First sale size 1,854 shares Common stock sold at $14.6356 per share

Second sale size 1,872 shares Common stock sold at $14.6327 per share

First trade price range $14.25–$14.84 Multiple trades; weighted average $14.6356

Second trade price range $14.22–$14.84 Multiple trades; weighted average $14.6327

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

RSU-linked shares 143,729 shares Issuable upon settlement of restricted stock units held by insider

Key Terms

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

4 terms

restricted stock units financial

"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.

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.

weighted average sale price financial

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

Employee Stock Purchase Plan financial

"shares 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.

Form 4 Insider Transactions: What Each Field Means →

05/20/2026 - 04:30 PM

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^*

PISETSKY MICHAEL A.

(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)
	SVP, Ops & Adm/Chief Legal Ofr

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⁾		1,872	D	$14.6327⁽²⁾	280,968	D
Common Stock	05/18/2026		S⁽¹⁾		1,854	D	$14.6356⁽³⁾	280,509⁽⁴⁾⁽⁵⁾	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 $14.25 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. This transaction was executed in multiple trades at prices ranging from $14.22 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.

4. Includes 1,395 shares acquired under the SI-BONE, Inc 2018 Employee Stock Purchase Plan on May 15, 2026.

5. Includes 143,729 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 A. Pisetsky	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

FAQ

What insider transaction did SI-BONE (SIBN) report for Michael A. Pisetsky?

Michael A. Pisetsky reported selling 3,726 shares of SI-BONE common stock on May 18, 2026. The sales were disclosed as open-market transactions and are associated with tax obligations from vesting restricted stock units rather than discretionary trading decisions.

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

He sold a total of 3,726 shares in two trades at weighted average prices of $14.6356 and $14.6327 per share. Footnotes state each transaction was executed in multiple trades within price ranges between $14.22 and $14.84 per share.

Why were Michael A. Pisetsky’s SI-BONE (SIBN) shares sold?

The shares were sold to cover tax withholding obligations linked to the vesting of restricted stock units. The filing explains these “sell to cover” trades satisfied tax liabilities and did not represent discretionary market sales initiated by the reporting person.

Were Pisetsky’s SI-BONE (SIBN) stock sales discretionary trades?

No. The disclosure states the sales were required to fund tax withholding obligations and executed as “sell to cover” transactions. It explicitly notes the activity does not represent discretionary trading by Michael A. Pisetsky in SI-BONE common stock.

What additional SI-BONE (SIBN) equity does Pisetsky hold after this Form 4?

Footnotes state his holdings include 1,395 shares acquired under the 2018 Employee Stock Purchase Plan on May 15, 2026. They also include 143,729 shares issuable upon settlement of restricted stock units, each unit representing a right to receive one share.

What is Michael A. Pisetsky’s role at SI-BONE (SIBN) mentioned in the Form 4?

He is identified as an officer of SI-BONE serving as senior vice president of operations and administration and chief legal officer. This role makes his equity transactions subject to reporting requirements, which are reflected in this Form 4 filing.