Occidental Petroleum (OXY) is not just another oil company. It’s a heavyweight in fossil fuel production, chemicals, and carbon capture

Investors' cash holdings are at a 15-year low — according to Bank of America's global fund manager survey — while Warren Buffett's Berkshire Hathaway (BRK-B, BRK-A) holds a record high of $325 billion in cash.

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The Omaha, Nebraska-based conglomerate scooped up 763,000 shares of the Houston-based oil and gas producer on Friday for $35.7 million, according to a filing.

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An attendee holds a cardboard cutout of Warren Buffett, chairman and chief executive officer of Berkshire Hathaway Inc. Photo credit: Getty Sometimes I perk up when I realize I’ve published my newsletter every day for nearly a year,

Instead, the “Oracle of Omaha” has become a “committed” and “long-term” investor in a handful of Japanese companies.

As always, Buffett shared insight into Berkshire's operations and plenty of wisdom. However, this time he also revealed something that could be concerning to shareholders if you connect the dots. Buffett just identified the biggest threat to Berkshire Hathaway.