X0609 4 2026-09-30 0 0001753539 BlackSky Technology Inc. BKSY 0001865965 Porteous William D. false C/O BLACKSKY TECHNOLOGY INC., 2411 DULLES CORNER PARK, SUITE 300 HERNDON VA 20171 1 0 0 0 0 Class A Common Stock 2026-09-30 4 A 0 1055 0 A 88378 D Class A Common Stock 719881 I See footnote These shares represent the Class A Common Stock that the Reporting Person elected to receive in lieu of cash compensation under the Issuer's Outside Director Compensation Policy for the quarter ended September 30, 2026. The number of shares awarded in lieu of cash was calculated based on the closing price of a share of Class A Common Stock on September 30, 2026. Certain of these securities are RSUs. Each RSU represents a contingent right to receive one share of Class A Common Stock, subject to the applicable vesting schedule and conditions of each RSU. 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 2026-10-02