X0306 4 2021-02-26 0 0001772720 XL Fleet Corp. XL 0001836780 Flanagan Declan C/O XL FLEET CORP. 145 NEWTON STREET BOSTON MA 02135 1 0 0 0 Common Stock 2021-02-26 4 A 0 2205 0.00 A 2205 D Common Stock 2021-02-26 4 A 0 7940 0.00 A 10145 D Stock Option (right to buy) 14.17 2021-02-26 4 A 0 3567 0.00 A 2031-02-26 Common Stock 3567 3567 D Stock Option (right to buy) 14.17 2021-02-26 4 A 0 12843 0.00 A 2031-02-26 Common Stock 12843 12843 D The securities awarded are in the form of restricted stock units issued pursuant to the issuer's 2020 Equity Incentive Plan. Each restricted stock unit represents a contingent right to receive one share of issuer common stock. Subject to the reporting person's continued service through the vesting date, the restricted stock units shall become fully vested on the first anniversary of December 21, 2020. The securities awarded are in the form of restricted stock units issued pursuant to the issuer's 2020 Equity Incentive Plan. Each restricted stock unit represents a contingent right to receive one share of issuer common stock. Subject to the reporting person's continued service through the applicable vesting date, 1/3rd of the restricted stock units shall vest every 12 months from December 21, 2020 until all shares underlying this award have vested. The shares underlying this option shall become fully vested on the first anniversary of December 21, 2020, subject to the reporting person's continued service through the vesting date. The shares underlying this option shall vest in equal installments on the first, second and third anniversary of December 21, 2020 until all shares underlying this option have vested, subject to the reporting person's continued service through the applicable vesting date. /s/ Jenna Stewart, Attorney-in-Fact 2021-03-02