X0306 4 2019-03-21 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 2019-03-21 4 S 0 3670 53.84 D 10000 D Class A Common Stock 142 I By the ManTech Employee Stock Ownership Plan The price in column 4 is a weighted average price. The prices actually received for the sale ranged from $53.80 to $53.91. 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. /s/ Michael R. Putnam, by Power of Attorney 2019-03-25