Updated from 11:01 a.m. EDTA company can blame its poor financial performance on a slow economy, world politics -- even the weather. But an investor with a large economic position in the company can hold the company accountable by turning to shareholder activism as a way to increase shareholder value. Despite the worst bear market since the 1930s, activist investors such as Warren Buffett, Bill Ackman of Pershing Square Capital Management and Carl Icahn by all accounts are still finding attractive valuations both on the long and short sided of the equity market. At Stockpickr, we follow the latest activist situations for investors interested in piggybacking of these activist investors. Stocks with recent activist activity include Blockbuster ( BBI) and Build-a-Bear Workshop ( BBW). To read more, visit Stockpickr.com.