Fairfax-based contractor Salient Federal Solutions last week bought Herndon-based woman-owned small business LIST Innovative Solutions as part of its bid to become a mid-tier contractor.

The move follows Salient’s purchase of McLean-based ATS Corp. earlier this year as well as previous acquisitions San Diego-based information technology firm SGIS and Alexandria-based IT firm Command Information.

“We’re continuing to look for good companies that round out our capabilities, our contracts and our customer access,” said Brad Antle, a government contracting veteran who heads Salient. He said Salient is not disclosing the price it paid for LIST.

LIST, which has about $25 million in revenue, provides IT, engineering and intelligence analytics services to federal agencies.

Before buying LIST, about 70 percent of Salient’s work was in defense and intelligence and about 27 percent federal civilian (about 2 percent is commercial). LIST will shift that balance to 63 percent defense and 35 percent civilian.

The purchase is meant to give Salient access to buying agreements with the Office of Personnel Management and the U.S. Patent and Trademark Office.

Antle said Salient will retain LIST’s offices in Herndon and Alexandria but integrate the company’s workforce with that of Salient.

He acknowledged that shrinking federal spending in coming years could make work hard to find but he said Salient is still seeking pockets of growth.

“If we pick and choose the right areas, we’ll have the opportunity to grow through those years,” he said. “It’s all about being in the right places with the right capabilities.”