Warren Buffett's Berkshire Hathaway builds new stake in Aon, ramps up Kroger bet

Warren Buffett at Berkshire Hathaway's annual meeting in Los Angeles, California. May 1, 2021.
Gerard Miller | CNBC

Warren Buffett's Berkshire Hathaway made a slew of changes to its equity portfolio last quarter, including adding a new bet on British insurance company Aon and increasing its stake in supermarket owner Kroger, a new regulatory filing showed.

The conglomerate bought more than 4 million shares of Aon, worth $942.6 million as of the end of the first quarter, according to a new 13F filing. Berkshire is no stranger to the insurance business as it owns GEICO and General Re among other insurance units.

Shares of Aon jumped more than 2% in extended trading on Monday following the news. The stock has rallied more than 20% in 2021 following a flat year.

More In Follow the Pros

CNBC Pro‘Tiger Cubs’ hedge funds are betting big on this year's hot IPOs, including Warby Parker and Ginkgo
CNBC ProThis mutual fund is the best in the country this year, up 65%. Here's what they are buying now
CNBC ProWorried about stagflation? One expert reveals his top stock picks to play the market right now