Warren Buffett has swallowed nearly 5% of the entire United States Treasury bill market, locking up $300.87 billion in short-term government debt through Berkshire Hathaway, based on fresh numbers from the company’s most recent financial disclosure.
That mountain of paper gives Warren a grip on 4.89% of the full T-bill pie, which hit $6.15 trillion at the end of March 2025. Warren controls nearly one in every twenty dollars floating around in the T-bill system.
The full breakdown in the report shows that Berkshire Hathaway is sitting on $14.4 billion worth of Treasury bills categorized as cash equivalents—those with under three months left to maturity.
On top of that, $286.47 billion more is tied up in short-term investments, all of them directly pegged to Treasury bills. That adds up to the $300.87 billion total.
