The performance leader today was K.WT.C:

Warrant Symbol - K.WT.C
Number Trading -15,508,105
Expiration Date - Sept. 3, 2013
Cusip - 496902 17 2

Exercise Price - $32.00

There is also another series, K.WT.B, up 15% today:

Warrant Symbol - K.WT.B
Number Trading - 4,704,926
Expiration Date - September 7, 2011
Cusip - 496902 16 4

Exercise Price - $22.49