When Forbes releases its annual ranking of the world's richest billionaires tomorrow (Wednesday), it appears likely Warren Buffett will once again come in behind his friend and online bridge partner, Bill Gates.
My extremely back-of-the-envelope calculation is based on big gains for shares of both Berkshire Hathaway and Microsoft over the past six months.
A year ago, Gates beat Buffett by $40 billion to $37 billion, ending the Omaha billionaire's one-year reign at the top of the global list. Before that, Gates had been number one for the previous 13 years.
We got an update last September. In its list of the 400 richest Americans, Forbes put Gates at the top with an estimated wealth of $50 billion. Buffett was number two with $40 billion.
Over the past six months, Berkshire shares have gained almost 26 percent, with much of the gain coming in the last few months. Microsoft hasn't done as well recently, but it had an early head start and the stock is up just over 17 percent.