Updated from 7:03 a.m. EDTAt Stockpickr.com, we keep track of the Top 10 Insider Purchases and Buybacks each week. Here's the perfect setup in my mind: insiders buying the stock, the company buying back its own shares and a super investor like Warren Buffett also making a bullish bet on the stock. If I can get three out of three, I'm in heaven. If I can get two out of three, or even one out of three, I'm still pretty happy about the situation, particularly if the stock is cheap in other ways as well. Each Thursday we update the Stockpickr Top 10 Insider Purchases and Buybacks portfolio, featuring stocks that in recent days have had big insider purchases or newly announced buybacks, as well as super investors accumulating shares. This week's portfolio includes AutoZone ( AZO), Lockheed Martin ( LMT), Wells Fargo ( WFC) and 3Com ( COMS). To read more, visit Stockpickr.com.