Sec Form 4 Filing - PEDERSEN GEORGE J @ MANTECH INTERNATIONAL CORP - 2022-03-28

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person PEDERSEN GEORGE J 2. Issuer Name and Ticker or Trading Symbol MANTECH INTERNATIONAL CORP [ MANT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2251 CORPORATE PARK DRIVE, SUITE 600 3. Date of Earliest Transaction (MM/DD/YY) 03/28/2022 (Street) HERNDON, VA20171 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 03/28/2022 C( 1 ) 11,580,000 A 11,580,000 D Class A Common Stock 03/29/2022 S( 2 ) 2,773,389 D $ 79.3253( 5 ) 8,806,611 D Class A Common Stock 03/29/2022 S( 3 ) 6,611,454 D $ 77.758( 6 ) 2,195,157 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class B Common Stock ( 4 ) 03/28/2022 C 11,580,000 ( 4 ) ( 4 ) Class A Common Stock 11,580,000 ( 4 ) 1,561,760 D Class B Common Stock ( 4 ) ( 4 ) ( 4 ) Class A Common Stock 1,168 1,168 I By spouse Class B Common Stock ( 4 ) ( 4 ) ( 4 ) Class A Common Stock 33,767 33,767 I By fund( 7 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other PEDERSEN GEORGE J 2251 CORPORATE PARK DRIVE SUITE 600 HERNDON, VA20171 X Signatures /s/ Michael R. Putnam, by power of attorney 03/30/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The conversion of Class B shares and other transactions reported herein were done as part of broader estate planning by Mr. Pedersen. ( 2 )Mr. Pedersen sold these shares to The Pederson GST 2022 Trust (the "GST"). The trust's grantor is Mr. Pedersen, its trustee is his daughter, Jennifer A. Warren, and its beneficiaries are Mr. Pedersen's children and their descendants. ( 3 )Mr. Pedersen sold these shares to The Pederson Nonexempt 2022 Trust (the "PNT"). The trust's grantor is Mr. Pedersen, its trustee is his daughter, Jennifer A. Warren, and its beneficiaries are Mr. Pedersen's children and their descendants. ( 4 )The Class B Common Stock is convertible into Class A Common Stock at any time on a one-for-one basis, and has no expiration date. On March 28, 2022, Mr. Pedersen converted a total of 11,580,000 shares of his Class B Common Stock into 11,580,000 shares of Class A Common Stock. ( 5 )The shares were sold in a private transaction to the GST. The price was determined based on the opinion of an independent valuation firm, which reflects a discount to the market price given the large block of shares sold and other factors. The GST paid $22,000,000 in cash and executed a promissory note in the aggregate principal amount of $197,999,984 for the shares. ( 6 )The shares were sold in a private transaction to the PNT. The price was determined based on the opinion of an independent valuation firm, which reflects a discount to the market price given the large block of shares sold and other factors. The PNT paid $51,409,330 in cash and marketable securities, and executed a promissory note in the aggregate principal amount of $462,683,945 for the shares. ( 7 )The shares are held by the ManTech Special Assistance Fund, a fund over which Mr. Pedersen has voting and investment control and as to which Mr. Pedersen disclaims beneficial ownership.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.