Update (9:44 a.m.): Updated with Monday market open information. NEW YORK ( TheStreet ) -- Barclays increased its price target on Berkshire Hathaway ( BRK.B ) to $149 and set an "overweight" rating. Significant leverage to improving economy drove the firm's decision. The stock spiked just after the market opened on Monday to an all-time high of $128.24. Must Read: Warren Buffett's 10 Favorite Growth Stocks SELL NOW: If you own any of the 900 stocks that TheStreet Quant Ratings has identified as a 'Sell'...you could potentially lose EVERYTHING in the next 6-12 months. Learn more. - Separately, TheStreet Ratings team rates BERKSHIRE HATHAWAY as a "buy" with a ratings score of A+. TheStreet Ratings Team has this to say about their recommendation: "We rate BERKSHIRE HATHAWAY (BRK.B) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate.