Berkshire Hathaway’s cash and investments in short-term Treasuries surged to $147bn at the end of the second quarter, underscoring Warren Buffett’s faith in the backbone of global financial markets despite the rocky political climate in Washington.

The sprawling conglomerate — which owns the BNSF railroad and Geico insurer — increased the holdings by nearly $17bn in the second quarter, to sit just below an all-time high of $149bn set in 2021. More than $120bn of that sum is invested in short-term Treasury bills.

The disclosure came days after rating agency Fitch stripped the US of its prized triple A rating. Analysts cited Washington’s repeated stand-offs over the debt ceiling, which drove the Treasury’s cash balances to dangerously low levels.