Warren Buffett’s having a rough week — and it’s only Tuesday by Laura Lorenzetti @FortuneMagazine October 21, 2014, 1:18 PM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons This just isn’t Warren Buffett’s week.The Oracle of Omaha has notched two consecutive days of $1 billion losses.It started Monday morning when IBM IBM , Buffett’s fourth-largest investment, issued a gloomy earnings report and pulled its 2015 profit goal. The bad news led to a dramatic drop in IBM’s stock price, dragging it to a three-year low and wiping away nearly $1 billion worth of Buffett’s money. Buffett owns 70.17 million IBM shares through his Berkshire Hathaway investment business.The story looks very similar today, but instead features Buffett’s No. 2 holding Coca-Cola KO . Coke’s stock plunged $2.61, or 6%, Tuesday after the iconic soda seller reported weak earnings and revenue that fell shy of analysts’ expectations.Buffett, of course, has often said he focuses on company fundamentals over short-term market moves, but he has has chalked up losses of over $1 billion across his 400 million shares in the Atlanta-based company, and the losses may continue to mount. Coke’s shares are headed for their biggest one-day drop since Oct. 2008 Tuesday. Coke has been one of Buffett’s portfolio standards for decades, and he’s publicly voiced his admiration for the company — including during a conversation with Fortune’s Carol Loomis at Berkshire’s annual meeting this year.It’s not all bad news for Buffett today though. His top holding, Wells Fargo WFC , is performing well, gaining 3.3% so far this week. The $1.59 improvement is a nearly $740 million boost for Buffett, though not nearly enough to cover the losses he’s seen at IBM and Coke.