One stock whose insiders are doing some notable buying is Glu Mobile ( GLUU), which designs, markets and sells mobile games. Insiders are buying shares of Glu Mobile into strength since this stock is up over 55% in 2011. Glu Mobile has a market cap of $208.93 million and an enterprise value of $172.52 million. This stock trades at a price-to-sales of 3.14 and a price-to-book of 3.60. Its estimated growth rate for this year is -87.5%, and for next year it's pegged at -33.3%. This is a cash-rich company, with a total cash position on its balance sheet of $37.05 million and total debt of zero. A director just bought 183,958 shares, or about $550,000 worth of stock, at $2.99 per share. This same director also just bought 447,097 shares, or about $1.3 million worth of stock, at $3 per share. >>6 Stocks Endowments Are Bullish On From a technical standpoint, GLUU is currently trading above its 50-day moving average and below its 200-day moving average, which is neutral trendwise. This stock has been trading within a sideways trading pattern for the last couple of months, between $3.80 and $2.55. A sustained move outside of that range should setup the next big trend for this stock. If you're bullish on GLUU, I would consider buying some shares once the stock can manage to move above some near-term overhead resistance at $3.39 to $3.50 a share on high volume. Look for volume that's running close to or above its three-month average action of 1.6 million shares. If we see that action, I would then add to any long positions once GLUU takes out its 200-day of $3.77 and $3.81 a share with heavy volume. I would simply use a stop that's right below the 50-day at $3.16, in case GLUU isn't ready to break out above the upper end of its range.