X0306 4 2021-05-20 0 0000892537 MANTECH INTERNATIONAL CORP MANT 0001341924 Bjornaas Judith L 2251 CORPORATE PARK DRIVE HERNDON VA 20171 0 1 0 0 Executive Vice President & CFO Class A Common Stock 2021-05-20 4 M 0 6000 36.87 A 24521 D Class A Common Stock 2021-05-20 4 M 0 6000 49.04 A 30521 D Class A Common Stock 2021-05-20 4 M 0 7500 53.90 A 38021 D Class A Common Stock 2021-05-20 4 S 0 3000 84.80 D 35021 D Class A Common Stock 2021-05-20 4 S 0 2000 85.13 D 33021 D Class A Common Stock 2021-05-20 4 S 0 7000 85.00 D 26021 D Class A Common Stock 2021-05-20 4 S 0 4000 85.06 D 22021 D Class A Common Stock 2021-05-20 4 S 0 3500 85.50 D 18521 D Class A Common Stock 2021-05-21 4 M 0 5000 55.85 A 23521 D Class A Common Stock 2021-05-21 4 M 0 2500 53.90 A 26021 D Class A Common Stock 2021-05-21 4 S 0 5000 86.02 D 21021 D Class A Common Stock 2021-05-21 4 S 0 2500 86.18 D 18521 D Class A Common Stock 142 I By the ManTech Employee Stock Ownership Plan Employee Stock Option (right to buy) 36.87 2021-05-20 4 M 0 6000 0.00 D 2022-03-15 Class A Common Stock 6000 0 D Employee Stock Option (right to buy) 49.04 2021-05-20 4 M 0 6000 0.00 D 2022-11-06 Class A Common Stock 6000 0 D Employee Stock Option (right to buy) 53.90 2021-05-20 4 M 0 7500 0.00 D 2023-03-15 Class A Common Stock 7500 2500 D Employee Stock Option (right to buy) 53.90 2021-05-21 4 M 0 2500 0.00 D 2023-03-15 Class A Common Stock 2500 0 D Employee Stock Option (right to buy) 55.85 2021-05-21 4 M 0 5000 0.00 D 2023-11-05 Class A Common Stock 5000 5000 D The price in column 4 is a weighted average price. The prices actually received for the sale ranged from $84.77 to $84.96. For all weighted average prices reported in this Form 4, the reporting person will provide the issuer, any stockholder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. The price in column 4 is a weighted average price. The prices actually received for the sale ranged from $85.10 to $85.13. For all weighted average prices reported in this Form 4, the reporting person will provide the issuer, any stockholder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. The price in column 4 is a weighted average price. The prices actually received for the sale ranged from $85.66 to $86.33. For all weighted average prices reported in this Form 4, the reporting person will provide the issuer, any stockholder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. The options were granted on March 15, 2017, with one-third of the total grant vesting on March 15, 2018, one-third of the total grant vesting on March 15, 2019, and the remaining one-third vesting on March 15, 2020. The options were granted on November 6, 2017, with one-third of the total grant vesting on November 6, 2018, one-third of the total grant vesting on November 6, 2019, and the remaining one-third vesting on November 6, 2020. The options were granted on March 15, 2018, with one-third of the total grant vesting on March 15, 2019, one-third of the total grant vesting on March 15, 2020, and the remaining one-third vesting on March 15, 2021. The options were granted on November 5, 2018, with one-third of the total grant vesting on November 5, 2019, one-third of the total grant vesting on November 5, 2020, and the remaining one-third vesting on November 6, 2021. /s/ Michael R. Putnam, by Power of Attorney 2021-05-24