Warren Buffett digs deeper into his big oil bet

Warren Buffett, chairman of Berkshire Hathaway Inc.
Lacy O'Toole | CNBC

After taking a break of nearly two weeks, Warren Buffett has resumed and accelerated his Phillips 66 shopping spree.

In a new filing, Buffett's Berkshire Hathaway reveals that over three days late last week, the company purchased another 2.5 million shares of the energy giant for almost $200 million.

The new purchases were made around $77, $78, and $79 per share. As there can be a lag of several days between purchases and SEC filings, we may find out soon if Berkshire continued to buy.