It seems that Warren Buffett is quite unhappy with Kraft Heinz's split plan. This time, the respected investor is facing a significant change: Kraft Heinz plans to split into two entities, but shareholders, including Buffett's Berkshire Hathaway, have not been given the opportunity to vote on it. This situation has disappointed Buffett, as he personally supported the merger of the two companies in 2015, and it now appears that the merger was a mistake in his career.

In a private call with "Squawk Box" co-host Becky Quick, Buffett candidly expressed his dissatisfaction. Berkshire currently holds a 27.5% stake in Kraft Heinz, valued at $8.9 billion, making Buffett the largest shareholder of the food company. Nevertheless, Berkshire's next CEO, Greg Abel, has informed Kraft Heinz's leadership that they do not support the opinion on this split.

Buffett not only questions the cost of the split but also its value. He told Becky Quick that the split process is expected to incur $300 million in expenses, but he does not believe that this measure will solve the earlier problems.

As soon as the news broke, the market reacted strongly. Kraft Heinz's stock plummeted by 7.6% that day, then slightly recovered, closing down by 2.4% overall. This undoubtedly delivered another blow to investors who have already suffered for a long time, as the company's stock price has lost 69% since the merger in 2015.

In 2015, Berkshire Hathaway partnered with Brazil's 3G Capital to acquire H.J. Heinz, laying the groundwork for this major merger. At that time, Berkshire received over 325 million shares of the merged company, valued at approximately $24 billion, but this optimism quickly faded in the following years. By 2020, the value of these shares hovered around $10 billion, below the $9.8 billion that Berkshire had paid, resulting in a $1 billion paper loss.

For Warren, this is not the first time he has encountered such a predicament. Berkshire has already written off $3 billion in losses in 2019, and in the last quarter alone, another $3.8 billion was written off, indicating that the market is not optimistic about this investment.

In the turmoil caused by the split, two members of the Berkshire board resigned from Kraft Heinz in May, leading to rampant speculation about Buffett selling stocks. Although he did not explicitly state whether he would begin selling, he acknowledged that Berkshire would take actions in its best interest.

Buffett's attitude undoubtedly adds pressure on Kraft Heinz, as they not only face market doubts but also criticism from the Financial Times. The media questions the company's failure to keep up with consumer expectations and likens the split to a means of covering up years of weak performance.

In stark contrast, Berkshire's other investment projects appear to be more stable. The 13F filing as of June 30 shows that the company has made solid investments in several publicly listed companies in the United States, Japan, and Hong Kong. Two Japanese investments are displayed in dollar amounts, with the exchange rate conversion based on the Tokyo Stock Exchange prices.