X0306 4 2022-02-08 0 0001374535 Altra Industrial Motion Corp. AIMC 0001159288 STORCH CHRISTIAN C/O ALTRA INDUSTRIAL MOTION CORP. 300 GRANITE STREET SUITE 201 BRAINTREE MA 02184 0 1 0 0 Chief Financial Officer Common Stock, par value $0.001 2022-02-08 4 A 0 16610 47.56 A 19363 D Common Stock, par value $0.001 2022-02-08 4 F 0 7301 47.56 D 12062 D Common Stock, par value $0.001 47788 I By Trust Performance shares earned after Compensation Committee determined that certain performance goals which measure the Company's total shareholder return ("TSR") against the TSR of a peer group of companies over the three year measurement period, from January 1, 2019 to December 31, 2021, had been met. The shares are issued as common stock par value $0.001 ("Common Stock") awarded to the Reporting Person under the Altra Industrial Motion Corp. 2014 Omnibus Incentive Plan. Dividends accrued on earned performance shares were included as additional shares of Common Stock in accordance with the terms of the award agreement. Shares forfeited in lieu of taxes upon vesting of Restricted Stock. The Shares are held in a trust for which Mr. Storch serves as the trustee. Todd Patriacca, Attorney-in-fact 2022-02-10