GROUP TO BUY MORE INTERMEDICS <ITM> SHARES An investor group including Bessemer Securities Corp and Cilluffo Associates told the Securities and Exchange Commission it asked federal antitrust regulators for advance clearance to hold more than 30 mln dlrs of Intermedics Inc common stock. The group said it currently holds 1.8 mln shares or 17.6 pct of the total outstanding following purchases of 84,300 shares March 18-April 1. A group spokesman would not disclose the total purchase price of its current holdings. The group has said it is accumulating Intermedics stock for investment purposes.