Who made 2015's biggest deals?

We've made a roundup of all the closed deals from 2015, and with our panel of M&A experts, we picked the most important deals of the year. See who tops the list.

PAE swaps out private equity ownership

Lindsay Goldberg has completed its acquisition of PAE as the company moves from one private equity owner for another.

CACI makes U.K. cyber deal

CACI International is still digesting its $550 million L-3 purchase, but that hasn't stopped its U.K. subsidiary from making a deal to bolster its cyber capabilities.

Opinion

What's ahead for M&A in 2016?

M&A activity was re-energized in 2015 and it looks like that momentum will carry over in 2016 as well. What major trends are driving today's deals?

Maximus picks up more health IT capabilies with latest acquisition

Maximus has acquired Ascend in a move that bolsters its state health care information technology capabilities.

Portfolio shaping not slowing down

Harris decision to shed its Aerostructures business is another example of how companies are putting an emphasis on tightly defining who they are and what they do.

General Atomics deal spotlights shifts in federal market

Divestitures continue to change the federal landscape, but for buyers like General Atomics each divestiture also represents an opportunity.

How LPTA killed Lockheed's IT business

A Lockheed Martin executive explains how the long-term prospect of an IT market dominated by LPTA contracts drove the company to its divestiture decision.

GWAC desire drives latest Vistronix deal

Vistronix has acquired TetraTech's little used Alliant contract as the company looks to win task orders before the contract expires as well as position itself to bid as a prime on the recompete.

Acquisition revives SOSi's intelligence business

With the market stabilizing and agencies knowing what their budgets are, it is critical to be at 100 percent. Sometimes, if a business unit is struggling, the way to come back strong is to acquire. Here's how one mid-tier player did it.

Arlington Capital makes robotics play

Arlington Capital is buying the defense and security business of iRobot to create a platform to pursue unmanned systems opportunities.

Done deal: CACI closes L-3 NSS acquisition

CACI has closed its $550 million acquisition of L-3 National Security Solutions as the market continues its rapid phase of consolidation.

Ball makes deal to add cyber capabilities

Ball Aerospace has made the biggest acquisition in its history in a deal to pick up Wavefront Technologies and add new cybesecurity capabilities.

Deal builds intelligence work for SOSi

SOS International has added significant intelligence work through the acquisition of New World Solutions.

Xerox to split printer, outsourcing businesses

Xerox is going the way of many of its peers -- splitting its business into two parts to increase its chances of success in today's market.

Inside one company's strategy to transform its offerings

For a decade, BRMi has helped customers figure out what they need to build, and now thanks to its acquisition of ClearSoft, BRMi is ready to build what they need as well.

What's Leidos getting for $5B?

We analyze what Leidos is getting in its $5 billion acquisition of Lockheed Martin's Information Services and Global Solutions business.

BRMi acquires agile enterprise software development, systems integration firm

BRMi has acquired ClearSoft in a move that bolster’s BRMi’s agile enterprise software development and systems integration capabilities.

What's left of Lockheed's IT business? Plenty

Lockheed Martin is selling the bulk of its IT business to Leidos, but that doesn't mean there won't be plenty of IT left at the defense giant. You'll just have to look a little harder for it.

The 'big one:' Leidos-Lockheed deal reshapes market

Leidos' planned acquisition of the bulk of Lockheed Martin's IT business will have ramifications across the market as the company becomes the biggest player in the federal space.