Warren Buffett has warned Berkshire Hathaway shareholders that his sprawling $905bn conglomerate has virtually “no possibility of eye-popping performance” in the years ahead, laying bare the challenges that will confront his successors.

The so-called Oracle of Omaha said in his annual letter on Saturday that there were very few deals that offer the kind of transformative impact past takeovers have had, such as its purchases of insurers Geico and National Indemnity or the BNSF railroad.

“There remain only a handful of companies in this country capable of truly moving the needle at Berkshire, and they have been endlessly picked over by us and by others,” he said. “Outside the US, there are essentially no candidates that are meaningful options for capital deployment at Berkshire.”