SECURITIES

Tisches Keep Bailing Out of Bank Stocks: CBS Inc. Chairman Laurence A. Tisch and his brother, Loews Corp. President Preston R. Tisch, have slashed their holdings in bank stocks again, according to Securities and Exchange Commission documents. They cut their stake in Bank of Boston Corp., Continental Bank Corp. and Baybanks Inc. to 5% or less. No reason was given. The Tisches gained attention on Wall Street late last year when they began buying low-priced bank stocks. Since February they have been cutting their stakes.