Berkshire Hathaway Inc. won’t be the same without Warren Buffett running things, and now investors must think about what kind of company it will become under Greg Abel.

Berkshire will miss Buffett’s “clout,” said one analyst, as the company lost about $30 billion in market value following the Oracle of Omaha’s retirement announcement.

"You're losing one of the most esteemed investors one could argue of all time," a source said of investors' reaction to Buffett's plan to step down.