The term "war chest" is frequently used in business to describe a large accumulation of cash kept by a company to deal with unexpected events or to take advantage of sudden opportunities. For Berkshire Hathaway, this war chest has reached an unprecedented $381.7 billion . But how does a company actually build such a massive pile of money, and where do they keep it? It isn't sitting in a giant vault like Scrooge McDuck; instead, it is managed through a series of highly calculated financial moves.

Stock Liquidation: Selling the Winners

The most direct way Berkshire has built its cash mountain is by selling its existing stock holdings. In the first nine months of 2024 alone, the company sold over $100 billion in stocks . This is a significant "selling spree" compared to previous years. For example, in the first nine months of 2023, they only sold about $33 billion worth of stock .

The most notable sales involve two of Berkshire's "Big Five" holdings:

Apple (AAPL): Buffett has been aggressively trimming his stake in the iPhone maker. At the start of 2024, Berkshire’s Apple stake was worth nearly $175 billion . By the end of the third quarter, that stake had been cut to approximately $70 billion . This means he sold roughly two-thirds of his position in less than a year .
Bank of America (BAC): Starting in mid-July 2024, Berkshire began offloading shares of this major lender . By the end of the third quarter, the stake had dropped from $41.1 billion to $31.7 billion .

Why Sell Now?

Selling these stocks isn't necessarily a sign that Buffett thinks Apple or Bank of America are "bad" companies. Instead, it is often about "taking profits" when the market is high. If a stock's price has risen significantly (Apple shares rose more than 10% in the third quarter of 2024 alone ), selling a portion of those shares allows Berkshire to lock in those gains and move the money into the safety of cash.

Treasury Bills: The Preferred Storage Method

When we say Berkshire has "$381.7 billion in cash," it is important to understand that the vast majority of this is not "cash" in the way we think of it (paper bills or a standard checking account). Instead, it is held in short-term U.S. Treasury bills (T-bills).

As of the third quarter of 2024, approximately $288 billion of Berkshire’s reserves were invested in these T-bills . In fact, at one point in 2024, Warren Buffett owned more U.S. Treasury bills than the U.S. Federal Reserve itself .

What are Treasury Bills?

For a beginner, think of a Treasury bill as a short-term loan you give to the U.S. government. In exchange, the government pays you interest. They are considered the safest investment in the world because they are backed by the "full faith and credit" of the United States.

Liquidity: They can be sold almost instantly if Berkshire needs cash to buy a company.
Yield: While they are low-risk, they still generate interest income. In a high-interest-rate environment, holding $288 billion in T-bills can generate billions of dollars in "passive" income for Berkshire every year .

Risk Management: The Insurance Engine

Another major source of Berkshire’s cash is its insurance business. Berkshire owns GEICO and several other large insurance and reinsurance companies. These businesses collect "float"—money paid in premiums by customers that hasn't yet been paid out in claims.

While insurance can be risky (for example, Hurricanes Helene and Milton caused billions in estimated losses for Berkshire in late 2024 ), the investment income from these insurance businesses rose 50% to almost $3.7 billion in a single quarter . This steady stream of income from premiums and investments helps keep the cash mountain growing even when the company isn't selling stocks.

The "No Buyback" Signal

A final way Berkshire keeps its cash pile high is by not spending it on itself. Usually, when a company has extra cash and thinks its own stock is cheap, it will perform a "share buyback." This is when the company buys its own shares off the market, which increases the value of the remaining shares for investors .

However, in the third quarter of 2024, Berkshire paused all share buybacks . This was a major signal to the market. Buffett has said he will only buy back shares when he believes the price is below Berkshire’s intrinsic value . By stopping buybacks, he is essentially telling the world: "Even my own company's stock is currently too expensive to buy" .

Case Study: The 2008 Financial Crisis

To understand why Buffett is so obsessed with "extreme fiscal conservatism" , we have to look back at the 2008 financial crisis. While other companies were panicking and going bankrupt because they couldn't borrow money, Berkshire was sitting on a mountain of cash.

Because they had cash when no one else did, they were able to act as a "lender of last resort." They provided crucial funding to massive institutions like Goldman Sachs and Bank of America on "extremely favorable terms" . Essentially, because these banks were desperate, Buffett was able to negotiate deals that guaranteed Berkshire billions in future profits. As Buffett told investors, "We did not predict the time of an economic paralysis but we were always prepared for one" . The current $381.7 billion pile is his way of being prepared for the next "paralysis."