(This is the Warren Buffett Watch newsletter, news and analysis on all things Warren Buffett. You can sign up here to receive in your inbox.)

Warren Buffett told CNBC he's "disappointed " that Kraft Heinz plans to split into two companies , essentially reversing the merger he helped orchestrate in 2015 that has turned out to be one of his biggest investment mistakes.

In an off-camera phone call on Tuesday with "Squawk Box" co-anchor Becky Quick , Buffett said he is also disappointed the split will not be subject to a shareholder vote.

With a 27.5% stake currently valued at $8.9 billion , Berkshire Hathaway is by far the food giant's largest shareholder .

Buffett said Berkshire's CEO-designate Greg Abel expressed their disapproval directly to the Kr

See Full Page