Warren Buffett has lost $2.5 billion only this week after a sharp decline in IBM and Coca-Cola shares.

IBM and Coke represent two of Berkshire Hathaway’s three biggest investments, but their operational missteps have already cost Warren Buffet $2.52 billion this week.

On October 20, Warren Buffett lost nearly $1 billion on his third-largest investment, IBM, after the company posted disappointing earnings.

Warren Buffett has lost $2.5 billion only this week after a sharp decline in IBM and Coca-Cola shares

On October 21, Coca-Cola did the same thing, posting Q3 2014 revenue that fell short of expectations and warning of currency headwinds.

The losses in IBM and Coke add to a recent rough patch for Warren Buffett, who slashed Berkshire Hathaway’s stake in British grocer Tesco earlier this month.

Warren Buffet has described buying into the stock as a “huge mistake”.

However, Warren Buffett’s favorite bank, Wells Fargo, is up more than $816 million since Monday morning.

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