What You Can Discover from Warren Buffett’s Hidden Portfolio and Its Lessons for Investors

Understanding Warren Buffett’s Lesser-Known Investments

When people picture Warren Buffett’s investment portfolio, they often think of giants like Apple or Coca-Cola. But there’s more to the story. Berkshire Hathaway has what could be called a “hidden” portfolio, involving substantial assets managed by New England Asset Management (NEAM).

As of August 2025, this particular portfolio was valued at around $647 billion, with Buffett’s “secret portfolio” possibly contributing up to $5.9 billion.

NEAM serves as the asset management division of Berkshire Hathaway’s insurance business, a position it took on several years ago. Unlike Berkshire’s main filings, the stocks handled by NEAM tend to be smaller and focus more on generating income. This aspect of Buffett’s strategy might not make headlines, but a glance at NEAM’s holdings illustrates how his team manages risk and balances investments.

Typically, NEAM invests in business development companies (BDCs), as indicated by their SEC filings. They have made investments in companies like Ares Capital, BlackRock TCP Capital, and Golub Capital BDC.

So, what exactly are BDCs? They’re essentially funds that offer loans to small and medium-sized businesses, particularly those struggling to secure funding through traditional banks. BDCs generally return the income they receive to their shareholders in the form of dividends.

One interesting observation is that NEAM doesn’t solely chase high returns; they also focus on more stable investments, which include:

Realty Income Corp (O): This REIT is yielding about 5.4% as of June 2025.

Kinder Morgan (KMI): A major pipeline operator in the U.S. with a yield of around 4.28%.

Vanguard High Dividend Yield ETF (VYM): This ETF encompasses a variety of dividend-paying stocks.

What’s clear is that even renowned investors like Buffett maintain diverse holdings for various reasons. The core of this “secret portfolio” leans toward long-term growth, emphasizing stable cash flow.

For instance, while BDCs provide opportunities for higher returns, they also carry more risk. Lending to businesses means there’s always a chance some borrowers might not pay back their loans, especially if the economy takes a downturn. This reality can lead to decreased dividends.