CSC [CSC] claimed the top spot in FY ’12 for the value of prime contracts awarded by the Department of Homeland Security (DHS) on the strength of its information technology and services work for the department.

Support for the Office of Procurement Operations (OPO) accounted for the largest chunk of CSC’s work with DHS, $258 million, followed by work for the Transportation Security Administration (TSA), $167 million, and U.S. Citizenship and Immigration Services, $154 million. The work was part of $670.2 million in contracts the company received from the department.

In FY ’11 CSC was the second largest recipient of DHS contracts with $505.8 million (HSR, Feb. 15, 2012).

Lockheed Martin [LMT] took the runner-up spot with $531.3 million in awards, about half of the total coming from the TSA and just over $100 million from Customs and Border Protection.

All told in FY ’12, DHS spent $17.6 billion on prime contracts, down from $19.9 billion in FY ’11. Excluding the Federal Emergency Management Agency, the Coast Guard was the biggest spender on prime contracts, $2.8 billion, followed by OPO, $2.4 billion, Customs and Border Protection, $1.8 billion, and TSA, $1.8 billion.

A list of the top 25 contractors follows:

Contractor                                                     $ in millions

CSC                                                                $670.2

Lockheed Martin                                            $531.3

SAIC                                                               $354.9

IBM                                                                $352.2

Bollinger Shipyards                                        $282.8

General Dynamics                                           $196.3

Hewlett-Packard                                             $193.1

L-3 Communications                                      $172.4

European Aeronautic Defence and Space Co.$166.5

Safran                                                              $165.1

Booz Allen Hamilton                                      $161.6

Dell                                                                 $151.5

The GEO Group                                             $142.6

Unisys                                                             $142

CSI Aviation Services                                                $127.6

Securitas AB                                                   $121.8

G4S Corp. Services Ltd.                                 $118

Chenega Corp.                                              $115.3

Covenant Aviation Security, LLC                  $114

Mythics, Inc.                                                   $96.5

Repubblica Italiana                                         $95.3

Siemens AG                                                    $94.5

Securitas Holdings                                          $87.1

Deloitte                                                           $86.5

Huntington Ingalls Industries                         $77.5