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One Stop Systems, Inc. entered into an amended and restated employment agreement with VP of Sales Robert Kalebaugh in connection with his retirement effective July 31, 2026. The agreement confirms his eligibility for a prorated annual bonus under the Variable Compensation Plan, sets the treatment of his outstanding equity awards at retirement, and allows a qualifying retirement to include continued service as a consultant.
On the same date, the company and Mr. Kalebaugh signed a consulting agreement under which he becomes an independent contractor providing part-time strategic counsel from July 31, 2026 through July 31, 2027, automatically renewing annually. Either party may terminate on 30 days’ written notice, or immediately for uncured breach after 10 business days. He may receive discretionary performance-based equity awards under the 2017 Equity Incentive Plan, and his existing unvested restricted stock awards continue to vest while he provides consulting services.
One Stop Systems, Inc. reported strong top-line growth from its edge computing business in the quarter ended June 30, 2026. Continuing operations revenue rose to $9,348,551 from $5,760,711 a year earlier, a 62% increase, driven by new defense and industrial programs and higher customer‑funded development. For the first six months, revenue grew 59% to $17,418,162, with both product sales and funded engineering contributing.
Gross profit for the first half increased to $7,818,597, and gross margin improved to 44.9% from 43.3%, helped by efficiencies on development programs and better manufacturing absorption. However, the company accrued a $6,250,000 legal settlement related to a dispute with Disguise Systems and Disguise Technologies, which, together with higher stock‑based compensation, drove an operating loss of $7,671,881 in Q2 and a net loss of $7,319,659 for the quarter and $7,839,521 year‑to‑date.
Liquidity remains solid, with $17,279,139 in cash and equivalents, $14,128,617 in short‑term investments, working capital of $38,082,133, no debt, and a $2,000,000 undrawn credit line. Following the late‑2025 sale of its Bressner subsidiary, results now primarily reflect U.S. operations, with only a $157,274 loss from discontinued operations tied to post‑closing purchase‑price adjustments.
One Stop Systems, Inc. investors Vladimir and Angelica Galkin and the Angelica Galkin Revocable Trust report significant holdings of the company’s common stock. Vladimir and Angelica Galkin each report beneficial ownership of 1,500,000 shares of common stock, representing 6.1% of the outstanding class for each of them. These holdings include 200,000 shares jointly owned by the Galkins and 1,300,000 shares held by the Angelica Galkin Revocable Trust, over which they have shared voting and dispositive power. The Trust itself reports beneficial ownership of 1,300,000 shares, or 5.2% of the class. Percentages are based on 24,769,017 shares of One Stop Systems common stock outstanding as of March 31, 2026.
BlackRock, Inc. reports beneficial ownership of common stock of ONE STOP SYSTEMS INC. BlackRock and certain of its business units collectively hold 1,833,734 shares, representing 7.4% of the outstanding common stock. The filing states sole voting power over 1,809,317 shares and sole dispositive power over 1,833,734 shares, with no shared voting or dispositive power. Various underlying clients have rights to dividends or sale proceeds, but no single client holds more than five percent of the issuer’s total outstanding common shares. The report is signed on behalf of BlackRock by a managing director.
ONE STOP SYSTEMS, INC. has a significant shareholder group consisting of Vladimir Galkin, Angelica Galkin and the Angelica Galkin Revocable Trust. Vladimir and Angelica Galkin each report beneficial ownership of 1,240,000 shares of common stock, representing 5% of the class.
The Angelica Galkin Revocable Trust, dated April 21, 2018, holds 1,040,000 shares, representing 4.2% of the outstanding common stock. These percentages are based on 24,769,017 shares outstanding as of March 31, 2026, as reported by the company.
KNOWLES MICHAEL reported disposition transactions in this Form 4 filing.
ONE STOP SYSTEMS, INC. CEO Michael Knowles reported a routine tax-related share forfeiture tied to vested equity compensation. He forfeited 19,675 shares of common stock at a value of $16.89 per share to cover tax withholdings when 50,000 vested restricted stock units converted into shares.
After this transaction, he directly holds 607,383 shares of common stock, which includes 333,311 unvested restricted stock units that remain subject to vesting conditions. The filing reflects compensation and tax mechanics rather than an open-market purchase or sale decision.
ONE STOP SYSTEMS, INC. Chief Financial Officer Daniel G. Gabel reported a routine tax-related share forfeiture. On conversion of 5,000 vested restricted stock units into common stock, he forfeited 1,613 shares at $15.68 per share to cover tax withholdings.
After this non-market disposition, he directly holds 153,896 shares of common stock and 127,762 unvested restricted stock units that remain subject to vesting conditions. The filing reflects compensation and tax mechanics rather than an open-market purchase or sale.
ONE STOP SYSTEMS, INC. director David George Bassett reported routine equity compensation and a related tax sale of common stock. On May 20, 2026, he acquired 11,984 restricted stock units under the company’s 2017 Equity Incentive Plan in connection with his board service, which are subject to vesting conditions.
A prior grant of 21,000 restricted stock units from May 21, 2025 recently vested and converted into common shares. To cover tax withholdings, 8,000 of those shares were sold in an open-market transaction at $17.64 per share on May 26, 2026, using the market price at the time of sale.
Following these transactions, Bassett holds 24,984 shares of common stock directly and continues to hold 11,984 unvested restricted stock units that remain subject to vesting requirements. The activity reflects standard director stock awards and associated tax-related share sales rather than discretionary open-market buying.
ONE STOP SYSTEMS, INC. director Gregory W. Matz reported a mix of equity compensation and tax-related selling activity. On May 20, he received 11,984 restricted stock units under the company’s 2017 Equity Incentive Plan, which are subject to vesting conditions. On May 26, he sold 8,000 shares of common stock at $17.52 per share after the conversion of 21,000 vested restricted stock units, with the sale used to cover tax withholdings. Following these transactions, he holds 78,914 shares of common stock, including 11,984 unvested restricted stock units that remain subject to vesting.
Dumont Michael J. reported acquisition or exercise transactions in this Form 4 filing.
ONE STOP SYSTEMS, INC. director Michael J. Dumont received a grant of 11,984 restricted stock units of common stock on May 20, 2026 at no cash cost, as compensation for his service as a director under the company’s 2017 Equity Incentive Plan.
After this grant, Dumont holds 119,833 common-share equivalents, consisting of 107,849 shares of common stock and 11,984 unvested restricted stock units that remain subject to vesting conditions.