One of the primary goals behind Stockpickr.com is to allow everyday investors to see what the big guns are buying. Often times, we see a well-known investor loading up on a particular stock. This is usually a good sign because you know that person put a lot of time and due diligence into that investment process.However, we also like to see that same company announce that an insider has purchased a large chunk of stock or, even better, the board initiate a new large stock-buyback program. From there, we have a very nice place to start our own homework. That's why each Thursday at Stockpickr we update the Top 10 Insider Purchases and Buybacks portfolio, featuring stocks that recently announced either big insider purchases or large share-buyback plans as well all while super investors are accumulating shares. Lockheed Martin ( LMT) makes this week's list. The missile systems and jet manufacturer said it will add an additional 20 million shares to its existing buyback plan. During the third quarter, the Bethesda, Md., aerospace company repurchased more than 4 million shares and raised its dividend 20% to 42 cents a share. Last week, Lockheed Martin reported a 22% jump in third-quarter profit. The company earned $766 million, or $1.80 a share, up from $629 million, or $1.46 a share, in the year-ago period, squashing analysts' expectations of $1.64 a share. Revenue came in at $11.1 billion, up 16% from $9.61 billion last year. Lockheed's aeronautics division saw a 31% jump in operating profit to $414 million.