X0508 4 2025-12-10 0 0001419951 Data Storage Corp DTST 0001688904 Kempster Thomas C/O DATA STORAGE CORP 244 5TH AVENUE, SUITE 2821 NEW YORK NY 10001 1 0 1 0 0 Common Stock 2025-12-10 4 S 0 6846 4.9934 D 871972 D Represents shares of the Issuer's common stock sold to satisfy tax withholding obligations of Thomas Kempster (the "Reporting Person") The price reported is a weighted average price. These shares were disposed in multiple transactions at prices ranging from $4.9518 through $5.0001 (the "Range"), inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the Range. /s/ Wendy Schmittzeh, Attorney-in-fact 2025-12-12