Warren Buffett’s Berkshire Hathaway has been quietly building a mystery stock position for two consecutive quarters, using special confidential treatment to keep the investment under wraps.
The identity of the company could be disclosed as early as Thursday, when the Omaha-based conglomerate files its quarterly 13F with the Securities and Exchange Commission.
Berkshire’s second-quarter earnings revealed a $2.8 billion increase in the cost basis of its “commercial, industrial and other” equity holdings, following a similar rise in the same category during the first quarter.
Analysts believe it is highly likely the company has been accumulating the same stock over both periods. The holding is now estimated to be worth roughly $4.7 billion.
The SEC’s confidential treatment allows institutional investors to build positions gradually without triggering significant price moves, which can occur when markets detect large-scale buying from high-profile players such as Buffett.
While Berkshire could opt to extend the secrecy for another quarter, market watchers say the odds are high that the mystery pick will soon be revealed.
Criteria point to industrial sector “wide moat” stocks
Buffett has long emphasized the importance of a company’s “moat” — a durable competitive advantage that can protect market share and generate strong returns on capital over decades.
This guiding principle has led analysts to narrow their focus when speculating about Berkshire’s undisclosed holding.
Using Morningstar’s research, CNBC Pro identified industrial sector companies with a “wide moat” rating.
These are firms that Morningstar believes can fend off competition for at least 20 years.
Additional screening criteria were applied to match Buffett’s historical preferences: a market capitalization of at least $1 billion, a forward price-to-earnings ratio at or below 20 (lower than the S&P 500 average), and US-listed shares.
One notable name that fits these parameters is defense contractor Lockheed Martin.
Bill Stone, chief investment officer at Glenview Trust Company and a longtime Berkshire shareholder, told CNBC that the aerospace and defense giant could be the stock in question.
Lockheed Martin shares have fallen about 10% recently, underperforming the broader market — potentially creating an attractive entry point for a value-focused buyer.
Other possibilities on the list include Huntington Ingalls Industries, another defense and industrial aerospace company, and several major railroad operators such as Canadian National Railway, Canadian Pacific, Kansas City, and Union Pacific Corp.
However, analysts note it is unlikely that Buffett would invest in rival railroads given Berkshire’s ownership of BNSF Railway.
Market awaits disclosure amid ongoing speculation
If revealed, the mystery investment will be closely analyzed by both Wall Street and individual investors, given Buffett’s track record of making long-term, high-conviction bets in companies he views as fundamentally strong.
While the secrecy around Berkshire’s move has fueled speculation, the company’s steady accumulation — alongside Buffett’s emphasis on durable competitive advantages and value metrics — has narrowed the field to a handful of potential candidates.
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