Symark International, an Agoura Hills company that manages user access to Unix and Linux systems, said it has acquired BeyondTrust, a Boston company that manages access on the Microsoft Windows platform.

The combined company will be private and will operate under the name BeyondTrust, the company said late Sunday, with Skymark Chief Executive John Mutch the new chief executive. Terms of the deal were not announced.

All 125 employees from both companies will be retained, the new BeyondTrust said. Former BeyondTrust CEO John Moyer will become executive vice president and general manager of the Windows business unit.

“We felt that the BeyondTrust name was more meaningful in the space we’re in and more relevant,” Matt Collier, Symark executive vice president, said in a statement.

The company’s products are designed to help customers maximize security and compliance objectives. More than half of the companies listed on the Dow Jones industrial average use the new BeyondTrust’s services, it said, with customers including eight of the world’s 10 largest banks, seven of the world’s 10 largest aerospace and defense firms, and six of the 10 largest U.S. pharmaceutical companies.