X0306 4 2022-02-28 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 2022-02-24 4 A 0 34809 0.00 A 303938 D Common Stock 99 I By Trust Represents Restricted Stock Units (RSUs) which are scheduled to vest over three years, subject to the Reporting Person's continued employment, as follows: 33% on the first and second anniversaries of the vesting commencement date and 34% on the third anniversary of the vesting commencement date. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock pursuant to the Maxar Technologies Inc. 2019 Incentive Award Plan. Granted by the Issuer for no consideration. Amount reported includes 144,261 unvested restricted stock units. The Reporting Person is the Co-Trustee of the Biggs Cunningham Porter Trust. /s/ Patricia Lamm, attorney-in-fact for Biggs C. Porter 2022-02-28