THT2 is a prototype (not a class!!!) built by Titan, a boatyard located in the small Republic of San Marino producing a few A class catamarans every year.
THT2 stands for Titan High Tech 2 (two crew boat).
Basically is a wider A class platform fitted with a taller mast, an Asymmetric and even a Code Zero.
This design resembles the Marstrom M18 and the Flyer XL, however these latter are intended to be sailed singlehanded.