SI-BONE, Inc. — Director's Dealing 2021

May 19, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SI-BONE, Inc. (SIBN)
CIK: 0001459839
Period of Report: 2021-05-17

Reporting Person: Pisetsky Michael A (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-17	Common Stock	S	1008.00	$31.4016	Disposed	78420.00	Direct
2021-05-17	Common Stock	S	894.00	$31.4016	Disposed	77526.00	Direct
2021-05-18	Common Stock	M	1975.00	$4.32	Acquired	79501.00	Direct
2021-05-18	Common Stock	S	1975.00	$32.00	Disposed	79036.00	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-18	Stock Option (Right to Buy)	$4.32	M	1975.00	Disposed	2026-07-26	Common Stock (1975.00)	Direct

Footnotes

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: The sale reported on this Form 4 was effected pursuant to a 10b5-1 trading plan.

F3: Includes 1,510 shares acquired under the SI-BONE, Inc. 2018 Employee Stock Purchase Plan on May 17, 2021.

F4: Includes 57,434 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.

F5: The shares subject to the option vest in equal monthly installments over four years commencing on vesting commencement date, subject to Reporting Person's continued service through each relevant vesting date.