X0306 4 2022-04-20 0 0001121142 Maxar Technologies Inc. MAXR 0001217839 PORTER BIGGS C 1300 W. 120TH AVENUE WESTMINSTER CO 80234 0 1 0 0 EVP, CFO Common Stock 2022-04-20 4 A 0 91789 0.00 A 414112 D Common Stock 2022-04-20 4 F 0 36120 39.46 D 377992 D Common Stock 99 I By Trust On April 20, 2022 the Compensation Committee of the Board of Directors of the Issuer determined the attainment of the relative total stockholder return and adjusted cash leverage performance goals underlying the performance stock units. Represents shares issued pursuant to settlement of performance stock units. Amount reported includes 121,672 unvested restricted stock units. Shares withheld by the issuer to satisfy tax withholding obligations upon vesting of performance stock units; not an open market transaction. The Reporting Person is the Co-Trustee of the Biggs Cunningham Porter Trust. /s/ Patricia Lamm, attorney-in-fact for Biggs C. Porter 2022-04-22