Reston’s EverWatch, a defense and national security contractor under the Enlightenment Capital umbrella, has made its largest acquisition to date, an Anne Arundel County IT and cloud services firm.

BrainTrust, headquartered in Annapolis Junction, will be merged into an EverWatch office in Columbia, Enlightenment Capital announced. Terms were not disclosed. The BrainTrust founders will join the company and “help lead EverWatch’s continued growth,” the company said.

“The addition of BrainTrust enables EverWatch to continue to aggressively pursue our strategy of combining innovative technical capabilities with the infrastructure and reach of a mid-tier player,” Jason Rigoli, partner at Enlightenment Capital and chairman of EverWatch, said in a statement.

EverWatch was founded in the fall of 2018 after Enlightenment Capital, the Chevy Chase-based aerospace and defense investment firm, merged IEA Corp. and ACES Inc. with two other unnamed companies. BrainTrust is the seventh acquisition for EverWatch, which is led by CEO John Hillen and Chief Growth Officer Fred Funk.

EverWatch has about 400 employees across three offices in Reston, Columbia and Aurora, Colorado. With the addition of BrainTrust, it is expected to rise to about 500 while providing a huge boost to EverWatch revenue.

BrainTrust provides software engineering, machine learning, systems engineering, cybersecurity and other services to the U.S. intelligence and defense communities.

“They bring a devoted team, a culture of innovation and a complementary set of capabilities, all of which will enhance EverWatch’s ability to help solve some of the nation’s most challenging security problems,” Devin Talbott, Enlightenment Capital managing partner, said in a statement.