2016 Rank: 15
Top Executive: Kenneth Lamneck, CEO
Location: Tempe, Ariz.
Insight Enterprises bought Datalink for $258 million to strengthen its data center services offerings around hybrid cloud, converged and hyper-converged infrastructure. The deal boosted the $5.5 billion company's services revenue by more than 50 percent and established relationships with next-generation data center vendors Pure Storage, Nimble Storage and Nutanix. Three of Datalink's top four executives – including CEO Paul Lidsky – left the company as part of the acquisition.