James Ison - 07 Feb 2026 Form 4 Insider Report for ONE STOP SYSTEMS, INC. (OSS)

Role
CPO
Signature
/s/ James Ison
Issuer symbol
OSS
Transactions as of
07 Feb 2026
Net transactions value
-$87,629
Form type
4
Filing time
02 Mar 2026, 14:42:13 UTC
Previous filing
25 Aug 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Ison James CPO 2235 ENTERPRISE STREET #110, ESCONDIDO /s/ James Ison 24 Feb 2026 0001729652

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OSS Common Stock Award $0 +34,313 +28% $0.000000 155,836 07 Feb 2026 Direct F1, F2
transaction OSS Common Stock Tax liability $60,485 -6,546 -4.2% $9.24 149,290 07 Feb 2026 Direct F3, F4
transaction OSS Common Stock Gift $0 -8,213 -5.5% $0.000000 141,077 07 Feb 2026 Direct F4, F5
transaction OSS Common Stock Gift $0 +8,213 +3.8% $0.000000 226,885 07 Feb 2026 By Trust F6
transaction OSS Common Stock Tax liability $27,144 -3,120 -2.1% $8.70 146,170 15 Feb 2026 Direct F7, F8
transaction OSS Common Stock Gift $0 -4,263 -2.9% $0.000000 141,907 15 Feb 2026 Direct F8, F9
transaction OSS Common Stock Gift $0 +4,263 +1.9% $0.000000 231,148 15 Feb 2026 By Trust F6
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents 34,313 restricted stock units granted to the Reporting Person under the Company's 2017 Equity Incentive Plan (the "Plan") in connection with the Reporting Person's ongoing service of the executive management team.
F2 Includes 148,076 unvested restriced stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.
F3 The Reporting Person forfeited 6,546 shares of common stock upon conversion of 14,759 vested and outstanding restricted stock units into shares of common stock to cover tax withholdings, using the market price of the Issuer's common stock at the time of forfeiture. These restricted stock units were part of the grant reported in Table I of the Form 4 filed by the Reporting Person with the Securities and Exchange Commission on February 7, 2025.
F4 Includes 133,317 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.
F5 On February 7, 2026 the Reporting Person transferred 8,213 shares of common stock to the James J. Ison Jr. & Sha-Marie A Ison TR UA 06 04 2020 James J. Ison Jr. & Shah-Marie A Ison Inter Vivos Revocable Trust (the "Trust"), of which the Reporting Person is trustee. The Reporting Person and members of his immediate family are the sole beneficiaries of the Trust.
F6 These shares are owned directly by the Trust, and indirectly by James Ison as trustee of the Trust.
F7 The Reporting Person forfeited 3,120 shares of common stock upon conversion of 7,383 vested and outstanding restricted stock units into shares of common stock to cover tax withholdings, using the market price of the Issuer's common stock at the time of forfeiture. These restricted stock units were part of the grant reported in Table I of the Form 4 filed by the Reporting Person with the Securities and Exchange Commission on July 1, 2024.
F8 Includes 125,934 unvested restricted stock units held by the Reporting Person, all of which remain subject to certain vesting conditions.
F9 On February 15, 2026 the Reporting Person transferred 4,263 shares of common stock to the James J. Ison Jr. & Sha-Marie A Ison TR UA 06 04 2020 James J. Ison Jr. & Shah-Marie A Ison Inter Vivos Revocable Trust (the "Trust"), of which the Reporting Person is trustee. The Reporting Person and members of his immediate family are the sole beneficiaries of the Trust.