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Berkshire Hathaway

on Saturday reported a small decline in second-quarter operating earnings as Warren Buffett’s conglomerate warns of negative impacts from steep U.S. tariffs.

Berkshire’s operating profit — those from the company’s wholly owned businesses including insurance and railroads — dipped 4% year over year to $11.16 billion in the second quarter. The results were impacted by a decline in insurance underwriting, while railroad, energy, manufacturing, service and retailing all saw higher profits from a year ago.

The Omaha-based conglomerate once again issued a stern warning of President Donald Trump’s tariffs and the potential impact on its various businesses.