Legendary investor Warren Buffett has officially stepped down as Chief Executive Officer of Berkshire Hathaway, closing a remarkable six-decade chapter that transformed a struggling textile mill into one of the world’s most valuable conglomerates;

The 'Oracle of Omaha' has overseen a cumulative return in Berkshire's Class A shares (BRK.A) of close to 6,060,000%, as of the closing bell on Dec. 24.