0001562180-19-004791.txt : 20190913 0001562180-19-004791.hdr.sgml : 20190913 20190913105903 ACCESSION NUMBER: 0001562180-19-004791 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20190912 FILED AS OF DATE: 20190913 DATE AS OF CHANGE: 20190913 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: OBRIEN WILLIAM K CENTRAL INDEX KEY: 0001187425 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 000-23599 FILM NUMBER: 191091784 ISSUER: 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: 0626 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 4 1 primarydocument.xml PRIMARY DOCUMENT X0306 4 2019-09-12 false 0001049521 MERCURY SYSTEMS INC MRCY 0001187425 OBRIEN WILLIAM K 50 MINUTEMAN ROAD ANDOVER MA 01810 true false false false Common Stock 2019-09-12 4 S false 1563.00 80.5701 D 53991.00 I Power of Attorney Common Stock 4361.00 D Although Mr. O'Brien is neither a trustee nor a beneficiary of the family trust that held these shares, he holds a power of attorney to dispose of the shares and accordingly these shares are reported as being indirectly beneficially owned by Mr. O'Brien. /s/ Michelle McCarthy, Attorney-in-Fact for OBRIEN WILLIAM K 2019-09-13