INVESTORS UP INTERMEDICS <ITM> STAKE TO 16.8 PCT A group of investment firms told the Securities and Exchange Commission they raised their stake in Intermedics Inc to 1,721,900 shares, or 16.8 pct of the total outstanding, from 1,565,900 shares, or 15.2 pct. Bessemer Securities Corp, a New York investment firm, Cilluffo Associates L.P., a New York investment partnership, and related entities said they bought 156,000 Intermedics common shares between February 24 and March 9 for 1.4 mln dlrs.