X0508 4 2025-12-10 0 0001753539 BlackSky Technology Inc. BKSY 0001865965 Porteous William D. C/O BLACKSKY TECHNOLOGY INC., 2411 DULLES CORNER PARK, SUITE 300 HERNDON VA 20171 1 0 0 0 0 Class A Common Stock 2025-12-10 4 A 0 1500 0 A 75691 D Class A Common Stock 719881 I See footnote These securities are restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of the Issuer's Class A Common Stock. These RSUs are awarded in connection with a review conducted by the Company's Compensation Committee of Outside Director Compensation and will vest in full upon the earlier of (i) September 11, 2026 or (ii) the date of the next Annual Meeting following the Transaction Date, subject to the Outside Director remaining a Service Provider through such vesting date. These shares are held by RRE Ventures IV, L.P. ("Ventures IV"). The general partner of Ventures IV is RRE Ventures GP VI, LLC ("GP VI"). The managing members and officers of GP VI are James D. Robinson IV, Stuart J. Ellman, and William D. Porteous. Each of GP VI and Messrs. Robinson IV, Ellman, and Porteous disclaim beneficial ownership of the securities reported on this Form 4, except to the extent of its or his pecuniary interest therein, if any. /s/ Christiana L. Lin, attorney-in-fact on behalf of William D. Porteous 2025-12-10