Which investment company, led for decades by Warren Buffett, has publicly traded Class A shares?

Berkshire Hathaway is the investment company led for decades by Warren Buffett and known for publicly traded Class A shares.

Berkshire Hathaway began as a textile manufacturer and became a diversified holding company after Buffett acquired shares in the 1960s. Its businesses now include insurance, rail transportation, utilities, energy, manufacturing, and retail operations.

The company issues Class A and Class B shares. Class A shares carry substantially greater voting power and have never been split, producing an exceptionally high per-share price. Class B shares were created in 1996 to make Berkshire ownership more accessible to smaller investors.

Berkshire's market capitalization reflects both its operating subsidiaries and its large portfolio of publicly traded investments. It is not a conventional mutual fund or an asset manager such as BlackRock.