Salomon Bros. plans to acquire PGB Securities.

The company said it will purchase PGB, a government securities inter-dealer broker, from the investment banking firm Mabon, Nugent & Co. Terms of the deal were not disclosed. PGB Securities currently has a very small share of the inter-dealer market, Salomon Bros. said. There are six other brokers who perform the same services of providing confidentiality by acting as intermediaries for transactions between primary dealers in U.S. government securities. Salomon Bros. said it was acting on behalf of a group with whom it expected to share ownership.