X0306 4 2017-09-19 0 0000892537 MANTECH INTERNATIONAL CORP MANT 0001337629 Phillips Kevin M 12015 LEE JACKSON HIGHWAY FAIRFAX VA 22033 0 1 0 0 President & COO Class A Common Stock 2017-09-19 4 M 0 30000 26.24 A 47656 D Class A Common Stock 2017-09-19 4 S 0 24020 41.03 D 23636 D Class A Common Stock 542 I By the ManTech Employee Stock Ownership Plan Employee Stock Option (right to buy) 26.24 2017-09-19 4 M 0 30000 0.00 D 2017-11-06 Class A Common Stock 30000 0 D The option exercises and sales of stock reported in this Form 4 were effected pursuant to Rule 105-1 trading plan previously adopted by the reporting person. The price in column 4 is a weighted average price. The prices actually received for the sale ranged from $40.87 to $41.15. 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 November 6, 2012, with one-third of the total grant vesting on November 6, 2013, one-third of the total grant vesting on November 6, 2014, and the remaining one-third vesting on November 6, 2015. /s/Michael R. Putnam, by Power of Attorney 2017-09-20