Buffett’s Berkshire Hathaway files secretive 13F report

by / ⠀News / June 20, 2025

Warren Buffett’s Berkshire Hathaway recently filed its quarterly 13F with the Securities and Exchange Commission. The filing included a confidential treatment clause, allowing Buffett to keep a significant new investment under wraps. On rare occasions, fund managers like Buffett request confidential treatment from regulators.

This enables them to build a position in a public company quietly and at an advantageous price, without the buying frenzy that typically follows such disclosures. Although Buffett’s current secretive purchase remains undisclosed, certain regulatory filings help narrow down the potential candidates. Typically, Buffett’s significant investments align with his strategy of purchasing sizable stakes, usually between $4 billion to $8 billion.

Berkshire Hathaway’s quarterly operating results detail its investment areas, which helps pinpoint the mystery stock’s category.

Confidential treatment boosts new investment

The cost basis in the “Commercial, Industrial, and Other” category rose from $47.14 billion to $49.1 billion.

Given that only a few hundred million dollars were invested in this category according to the 13F, it is evident that Buffett’s mystery stock resides here. Buffett’s historical investment preferences and current portfolio provide additional clues. He generally avoids technology and healthcare due to their complexity and his lack of comprehensive understanding regarding their innovations and clinical developments.

With existing investments in Occidental Petroleum and Chevron, it is less likely he would add another major energy stock. Instead, investing in an industrial company would resonate more with Buffett’s traditional investment strategy focused on American manufacturing. While the exact identity of the mystery stock remains speculative, the circumstantial evidence points towards a significant industrial company fitting Buffett’s investment criteria.

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Stay tuned to see how this strategic move by one of the world’s most esteemed investors unfolds.

About The Author

Kimberly Zhang

Editor in Chief of Under30CEO. I have a passion for helping educate the next generation of leaders. MBA from Graduate School of Business. Former tech startup founder. Regular speaker at entrepreneurship conferences and events.

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