Group Led by Investment Firm Buys 5.4% of Nu-Med

A group led by officials of the New York investment firm Allen & Co. bought a 5.4% stake in Nu-Med, an Encino operator of hospitals and other health-care facilities.

In a filing with the Securities and Exchange Commission, the group said it bought the 466,500 shares for investment purposes only and has no plans to seek control of Nu-Med.

The group said it bought the stock between March 8 and April 20 at prices between $5.75 and $6.06 a share. Nu-Med’s stock, which lately has traded near its highest level of the past year with the help of the Allen group’s activity, closed Monday at $6.125 in the over-the-counter market.