<SEC-DOCUMENT>0001140361-22-001627-index.html : 20220113
<SEC-HEADER>0001140361-22-001627.hdr.sgml : 20220113
<ACCEPTANCE-DATETIME>20220113172159
ACCESSION NUMBER:		0001140361-22-001627
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		6
FILED AS OF DATE:		20220113
DATE AS OF CHANGE:		20220113
GROUP MEMBERS:		JEFFREY C. SMITH
GROUP MEMBERS:		PETER A. FELD
GROUP MEMBERS:		STARBOARD PRINCIPAL CO GP LLC
GROUP MEMBERS:		STARBOARD PRINCIPAL CO LP
GROUP MEMBERS:		STARBOARD VALUE & OPPORTUNITY C LP
GROUP MEMBERS:		STARBOARD VALUE & OPPORTUNITY MASTER FUND L LP
GROUP MEMBERS:		STARBOARD VALUE & OPPORTUNITY MASTER FUND LTD
GROUP MEMBERS:		STARBOARD VALUE & OPPORTUNITY S LLC
GROUP MEMBERS:		STARBOARD VALUE GP LLC
GROUP MEMBERS:		STARBOARD VALUE L LP
GROUP MEMBERS:		STARBOARD VALUE R GP LLC
GROUP MEMBERS:		STARBOARD VALUE R LP
GROUP MEMBERS:		STARBOARD X MASTER FUND LTD

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MERCURY SYSTEMS INC
		CENTRAL INDEX KEY:			0001049521
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRONIC COMPONENTS & ACCESSORIES [3670]
		IRS NUMBER:				042741391
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			0701

	FILING VALUES:
		FORM TYPE:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-52823
		FILM NUMBER:		22529822

	BUSINESS ADDRESS:	
		STREET 1:		50 MINUTEMAN ROAD
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810
		BUSINESS PHONE:		9782561300

	MAIL ADDRESS:	
		STREET 1:		50 MINUTEMAN ROAD
		CITY:			ANDOVER
		STATE:			MA
		ZIP:			01810

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERCURY COMPUTER SYSTEMS INC
		DATE OF NAME CHANGE:	19971112

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Starboard Value LP
		CENTRAL INDEX KEY:			0001517137
		IRS NUMBER:				000000000

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		777 THIRD AVENUE, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		(212) 845-7977

	MAIL ADDRESS:	
		STREET 1:		777 THIRD AVENUE, 18TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>brhc10032838_sc13da.htm
<DESCRIPTION>SC 13D/A
<TEXT>
Document 1 - file: brhc10032838_sc13da.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>brhc10032838_ex99-1.htm
<DESCRIPTION>EXHIBIT 99.1
<TEXT>
Document 2 - file: brhc10032838_ex99-1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.2
<SEQUENCE>3
<FILENAME>brhc10032838_ex99-2.htm
<DESCRIPTION>EXHIBIT 99.2
<TEXT>
Document 3 - file: brhc10032838_ex99-2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.3
<SEQUENCE>4
<FILENAME>brhc10032838_ex99-3.htm
<DESCRIPTION>EXHIBIT 99.3
<TEXT>
Document 4 - file: brhc10032838_ex99-3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>image0.jpg
<TEXT>
Document 5 - file: image0.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>image00002.jpg
<TEXT>
Document 6 - file: image00002.jpg

</DOCUMENT>
</SEC-DOCUMENT>