X0508 4 2023-08-14 0 0001394056 ONE STOP SYSTEMS, INC. OSS 0001219078 RAUN DAVID 2235 ENTERPRISE STREET #110 ESCONDIDO CA 92029 1 0 0 0 0 Common Stock 2023-08-14 4 P 0 5000 1.97 A 411644 D The price reported on Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.96 to $1.98, inclusive. The reporting person undertakes to provide to One Stop Systems, Inc., any security holder of One Stop Systems, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in the footnote to this Form 4. /s/ David Raun 2023-08-15