X0306 4 2022-03-29 0 0001884697 Starry Group Holdings, Inc. STRY 0001284498 Chiddix James A. C/O STARRY GROUP HOLDINGS, INC. 38 CHAUNCY STREET, SUITE 200 BOSTON MA 02111 1 0 0 0 Class A Common Stock 2022-03-29 4 A 0 70773 A 70773 D Stock Option (Right to Buy) 0.93 2022-03-29 4 A 0 55223 A 2027-01-23 Class A Common Stock 55223 55223 D Pursuant to the Agreement and Plan of Merger, dated as of October 6, 2021 (as the same has been or may be amended, modified, supplemented or waived from time to time, the "Merger Agreement") by and among FirstMark Horizon Acquisition Corp. ("FMAC"), Sirius Merger Sub, Inc., Starry, Inc. ("Starry"), and Starry Group Holdings, Inc. (the "Issuer"), (i) all outstanding Starry capital stock held by the Reporting Person was cancelled and automatically converted into the right to receive a number of shares Class A Common Stock of the Issuer equal to the applicable exchange ratio (as described in the Merger Agreement) and (ii) each outstanding Starry equity award was converted into a corresponding equity award of the Issuer, on the same terms and conditions as were applicable to the Starry equity award, based on the applicable exchange ratio (determined in accordance with the Merger Agreement). The option is fully vested and exercisable. /s/ William Lundregan, attorney-in-fact 2022-03-31