Its the Homebuilder sector in a whole. BZH is short 36% of float, which is nuts because there are only 25 million shares available to trade. TOL is up to double digits short also. It looks like sellers are selling short into this recent move up to hold it back. BZH TOL and DHI are all very close to breaking out. If they can, there will be a huge squeeze - especially BZH with 36% short interest and a tiny 25 million share float.