SEC FORM 4 SEC Form 4
FORM 4 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
or Section 30(h) of the Investment Company Act of 1940
 
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
THIBAUD DIDIER M C

(Last) (First) (Middle)
50 MINUTEMAN ROAD

(Street)
ANDOVER MA 01810

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
MERCURY SYSTEMS INC [ MRCY ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
EVP, COO
3. Date of Earliest Transaction (Month/Day/Year)
05/08/2017
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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
Common Stock 05/08/2017 M 30,000(1) A $13.07 418,694 D
Common Stock 05/08/2017 S 30,000 D $40.4138(2) 388,694 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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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 (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (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: 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
NQ Stock Option (Right to buy) $13.07 05/08/2017 M 30,000 06/05/2011 06/05/2017 Common Stock 30,000 $0.00 0 D
Explanation of Responses:
1. The exercise of the stock option and sale of the underlying shares reported herein was pursuant to a 10b5-1 stock trading plan for a stock option expiring on June 5, 2017.
2. The price reported in Colum 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.13 to $40.73, inclusive.
Remarks:
Gerald M. Haines II, Attorney-in-fact 05/09/2017
** Signature of Reporting Person Date
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.
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LIMITED POWER OF ATTORNEY FOR
SECTION 16 REPORTING OBLIGATIONS


Know all by these presents, that the undersigned hereby constitutes and appoints
each of the Chief Financial Officer, the General Counsel, and the Chief
Accounting Officer of Mercury Systems, Inc., acting singly, the undersigned's
true and lawful attorney-in-fact to:

(1)	prepare, execute in the undersigned's name and on the undersigned's behalf,
and submit to the U.S. Securities and Exchange Commission (the "SEC") a Form ID,
including amendments thereto, and any other documents necessary or appropriate
to obtain codes and passwords enabling the undersigned to make electronic
filings with the SEC of reports required by Section 16(a) of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), or any rule or regulation
of the SEC;

(2)	execute for and on behalf of the undersigned, in the undersigned's capacity
as an officer, director, and/or shareholder of Mercury Systems, Inc. (the
"Company"), Forms 3, 4, 5, and 144 and amendments thereto, in accordance with
Section 16(a) of the Exchange Act and the rules thereunder;

(3)	do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such Form 3, 4, 5 or
144, or amendments thereto, and timely file such form with the SEC and any stock
exchange or similar authority; and

(4)	take any other action of any type whatsoever which, in the opinion of such
attorney-in-fact, may be necessary or desirable in connection with the foregoing
authority, it being understood that the documents executed by each such
attorney-in-fact on behalf of the undersigned pursuant to this Limited Power of
Attorney shall be in such form and shall contain such terms and conditions as
such attorney-in-fact may approve, provided, however, that the undersigned does
not grant to each such power-of-attorney the right to engage in any transactions
involving the securities of the Company on behalf of the undersigned, including
without limitation, the right to purchase or sell any securities of the Company.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that each such attorney-in-fact, or each
such attorney-in-fact's substitute or substitutes (any such substitute also
being referred to herein as an "attorney-in-fact"), shall lawfully do or cause
to be done by virtue of this Limited Power of Attorney and the rights and powers
herein granted.  The undersigned acknowledges that each attorney-in-fact, in
serving in such capacity at the request of the undersigned or such
attorney-in-fact, is not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Exchange Act.

The undersigned agrees that each such attorney-in-fact shall not be liable for
any error of judgment or for any act done or omitted to be done or for any
mistake of fact or law except for each such attorney-in-fact's own bad faith,
and the undersigned agrees to indemnify and to hold each such attorney-in-fact
harmless against any loss, claim, damage, liability, or cost incurred on each
such attorney-in-fact's part arising out of or in connection with acts
undertaken or omitted to be taken as an attorney-in-fact hereunder.

This Limited Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, 5, and 144 with respect to
the undersigned's holdings of
and transactions in securities of Mercury Systems, Inc., unless earlier revoked
by the undersigned in a signed writing delivered to the foregoing
attorneys-in-fact.  This Limited Power of Attorney may be filed with the SEC as
a confirming statement of the authority granted herein.

IN WITNESS WHEREOF, the undersigned has caused this Limited Power of Attorney to
be executed as of this 1st day of August, 2016.

                                                   /s/ Didier M.C. Thibaud