X0306 4 2021-05-13 0 0000064463 MECHANICAL TECHNOLOGY INC MKTY 0001243628 TOPOREK MICHAEL C/O MECHANICAL TECHNOLOGY, INCORPORATED 325 WASHINGTON AVENUE EXTENSION ALBANY NY 12205 1 1 1 0 Chief Executive Officer Stock Options (Right to Buy) 6.84 2021-05-13 4 A 0 500000 0 A 2022-05-13 2027-05-13 Common Stock 500000 507500 D The stock options were received as compensation for the reporting person's services as an officer of the issuer. The stock options are schedule to vest in equal installments on the first, second and third anniversaries of May 13, 2021, so long as the reporting person remains in the service of the issuer on each such anniversary. The stock options expire five years after each applicable vesting date. /s/ Jessica L. Olszowy, attorney-in-fact 2021-05-17