On October 28, 2026, One Stop Systems, Inc. (the "Company") entered into an Equity Distribution Agreement (the "Distribution Agreement") with Piper Sandler & Co. (the "Sales Agent"), pursuant to which the Company may offer and sell, from time to time, shares of its common stock, par value $0.0001 per share (the "Shares"), having an aggregate offering price of up to $50 million, through the Sales Agent, acting as sales agent (the "ATM Offering"). Sales of the Shares, if any, under the Distribution Agreement may be made in transactions that are deemed to be "at-the-market offerings" as defined in Rule 415(a)(4) promulgated under the Securities Act of 1933, as amended (the "Securities Act"), including sales made directly on or through The Nasdaq Stock Market LLC. Subject to the terms of the Distribution Agreement and the prior written consent of the Company, the Sales Agent may also sell Shares in negotiated transactions at market prices prevailing at the time of sale or at prices related to such prevailing market prices, or by any other method permitted by law.

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