Which company uses the ticker BRK.A for its highest-priced class of publicly traded shares?

Berkshire Hathaway uses the ticker BRK.A for its highest-priced class of publicly traded shares.

Berkshire Hathaway has two publicly traded share classes. Class A shares trade under BRK.A, while Class B shares trade under BRK.B. Each Class A share has substantially greater voting power and is economically equivalent to 1,500 Class B shares, although the two classes have different voting rights.

Warren Buffett has led Berkshire since the 1960s, transforming it from a struggling textile manufacturer into a diversified holding company. Its businesses include insurance, railroads, utilities, manufacturing, and retail, and it also owns a portfolio of publicly traded investments.

The BRK.A symbol does not mean the company is a bank or an asset manager. Berkshire's insurance operations, especially GEICO and reinsurance businesses, have historically been central to its finances and investment capacity.