David Raun - Jul 9, 2021 Form 4 Insider Report for ONE STOP SYSTEMS, INC. (OSS)

Role: President and CEO, Director
Signature: /s/ David Raun
Stock symbol: OSS
Transactions as of: Jul 9, 2021
Transactions value $: -$405,778
Form type: 4
Date filed: 7/12/2021, 07:15 PM
Next filing: Aug 19, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OSS	Common Stock	Options Exercise		+137K	+164.43%		221K	Jul 9, 2021	Direct	F1
transaction	OSS	Common Stock	Tax liability	-$406K	-67K	-30.31%	$6.06	154K	Jul 9, 2021	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	OSS	Restricted Stock Units	Options Exercise	$0	-137K	-33.33%	$0.00	275K	Jul 9, 2021	Common Stock	137K		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Restricted stock units convert into shares of common stock on a one-for-one basis.
F2	The Reporting Person received 137,375 shares of common stock upon vesting of the restricted stock units, as reported in this Form 4. The Reporting Person forfeited 66,960 shares of common stock underlying the vested and outstanding restricted stock units to cover tax withholdings, using the market price of the Issuer's common stock at the time of forfeiture.
F3	The restricted stock units ("RSUs") shall vest over three years, with 1/3 of the RSUs vesting following the one-year anniversary of the date of grant, and the remaining RSUs shall vest in four equal installments, commencing six months after the one-year anniversary of the date of grant and every six months thereafter until fully vested, provided that grantee is still employed on each such vesting date.