Trading at Kuwait Stock Exchange slumped in the red at 11:15 a.m. Thursday with the weighted index reaching 430.02 points on a decrease of 1.15, while the price index came to 6,238.07 points on a loss of 2. 69 points and the KSX 15 index to 1,039.33 on a slip of 3.05 points. Trades came to 3,910 transactions, worth KD 20,687,258. and volume came to 221,024,006 shares.