Berkshire Hathaway sold Bank of America stock in nine straight trading sessions to close the month of August and into the start of September, resuming a sell-off that started in July when the bank's stock hit a two-year high.

Berkshire Hathaway began liquidating its big stake in the banking company in mid-July—and has already unloaded about 15% of its interest.

Stock buybacks have slowed to a trickle. “If Buffett’s not buying his own stock, then why should we?” one investor asked.

But at the end of the day, neither Occidental Petroleum nor Sirius XM are Warren Buffett's favorite stock to buy. "Favorite stock" is a term reserved for the company the Oracle of Omaha has purchased for 24 consecutive quarters.