Mr Buffett is known for making most likely estimation about established companies rather than investing in riskier stocks.

Warren Buffett has lost $2 billion this week.Buffett is known for focusing on the long-term performance of his investments. Berkshire Hathaway investment house portfolio includes huge parts of Coke and IBM, both of which have decline in profits in the past two days. The investment firm took a $1 billion hit on Coke (KO), which fizzled 6% on Tuesday after the company reported earnings that didn't live up to expectations of investors. Worsening the situation, Coke said it doesn't expect a much better 2015.Berkshire Hathaway's one of the lasgest investment is Coke. It holds 400 million shares and his son Howard sits on the beverage company's board.On Monday,IBM (IBM, Tech30), another top holding, caused Warren Buffett a loss of $1.3 billion as the stock plunged. The company is looking for a revitalization after reporting disappointing earnings and shedding its chip unit at a major loss. The stock dropped 7% on Monday after then news was made public and slid again on Tuesday. It is off nearly 13% so far this year, and Buffett's company, Berkshire Hathaway holds over 70 million shares.Buffet has been actively quoted a lot this year for his misses. Berkshire Hathaway's investment on British grocery chain Tesco (TSCDY) has also been a loss, with maximum drop: nearly 47% this year.On the other hand, there's silver lining and it's more vivid, investors are supporting the company. Berkshire stock climbed slightly on Monday and Tuesday, and is up more than 17% this year.IBM and Coke may be losing money, but Buffett's largest position, Wells Fargo, has raised 11% this year. And eventhough the market goes down, Buffett is adding more stocks to his portfolio.He said in an interview "the more stocks go down, the more I like to buy."