Mark Cuban, the majority partner of Sharesleuth.com, will periodically make personal investments based on information we uncover. Those investments will be fully disclosed, so that readers can evaluate any potential conflicts of interest.

Cuban sold short 10,000 shares of Xethanol Corp. at a time when the stock was around $12.65 a share. He continues to hold that position.

Cuban also has sold short 12,512 shares of UTEK Corp. He had been short as many as 90,488 shares, but most of those shares were bought in earlier this year. He did not intentionally cover his position.

Cuban took a short position in the shares of China Fire & Security Group last year but has since closed out that position.

Christopher Carey, editor of Sharesleuth.com, does not buy or sell individual securities.