STR Holdings Inc. (STRI) said it expects that its largest customer, First Solar Inc. (FSLR), will end its relationship with the maker of solar components during the first quarter. GTAT could be the next customer of First Solar. It's relaly likley !! That's the reason why the put/call ratio in this stock is now very low. Look at the call options for June strike $5 ..... Here's the reason for the huge volume early this month.