Two contractors announced more than 250 layoffs at Fort Meade and a site in Windsor Mill.

The two companies, Leidos and Tyto Athene, work out of the Defense Information Systems Agency at Fort Meade in Anne Arundel County, and Leidos is a contractor for the Social Security Administration in Windsor Mill.

Leidos announced 156 layoffs in Windsor Mill, effective June 5. At Fort Meade, Leidos and Tyto Athene announced 71 and 39 layoffs, respectively, effective May 31.

Brandon Ver Velde, a spokesperson for Reston, Virginia-based Leidos, said the company’s layoffs at Fort Meade reflect contract changes and the agency bringing some work in-house. The layoffs in Windsor Mill are due to the Social Security Administration expanding from a contract with Leidos to a multi-contractor program, he said.

“This will include transitioning part of the current work to other vendors,” Ver Velde said in an email.

Ver Velde said Leidos intends to reassign as many of its employees as possible to other open positions in Maryland, Virginia or Washington, D.C. With $17.2 billion in revenue last year, Leidos employs roughly 47,000 people.

Tyto Athene, also based in Reston, would not comment on the layoffs.

Fort Meade is the U.S. military’s second-largest installation by population, according to the Department of Defense. It houses more than 64,000 employees and largely focuses on intelligence, information and cyber operations. The installation is Maryland’s largest employer, according to state data.

Fort Meade is the largest employer in Anne Arundel County — by far, according to the Anne Arundel Economic Development Corporation. The county’s largest private employer is Northrop Grumman, with more than 10,000 employees.

The headquarters of the Social Security Administration are in Windsor Mill. With more than 11,000 employees, it is Baltimore County’s second-largest employer, according to the county, behind the school system.