STOCK WATCH

Among 24 of the largest San Gabriel Valley-based companies traded on the New York and American stock exchanges and NASDAQ, 12 gained, nine lost and three remained unchanged Tuesday compared with the same day last week. Here is how six fared over the past week.

Tue. Point Company Price Change GAINERS Tetra Tech Inc. 23.50 +1 1/4 Marshall Industries 25.25 +1 1/2 First Mortgage Corp. 5.50 + 3/4 LOSERS CenFed Financial Corp. 20.00 - 1/2 Optical Radiation Corp. 22.75 - 5/8 Calmat 20.38 - 5/8

Source: Joe Lamas of Merrill Lynch, Pierce, Fenner & Smith Inc., Pasadena