Big Four

Proper noun

 * 1)  The four top Allied powers of World War I and their leaders:  of Britain,  of France,  of Italy and  of the United States, who met at the Paris Peace Conference in 1919 at Versailles.
 * 2) A group of four entrepreneurs who formed the.
 * 3)  A jazz rhythm derived from the marching band beat.
 * 4) Any group of four major or largest corporations in a given, especially when such a small group has  or near-oligopoly; as:
 * 5)  The four largest banks in any of various countries, or (internationally) the Federal Reserve, People's Bank of China, Bank of Japan, and European Central Bank.
 * 6)  The four largest corporations of  during the 2000s-2020s, usually defined as Alphabet (f.k.a. ), Meta (f.k.a. ),, and.
 * 7)  The four largest global auditing firms, comprising,  (EY), KPMG, and PwC.
 * 8)  The four largest railway companies in the United Kingdom in the period 1923–1947: the  (GWR); the  (LMS); the  (LNER); and the  (SR).
 * 1)  The four largest global auditing firms, comprising,  (EY), KPMG, and PwC.
 * 2)  The four largest railway companies in the United Kingdom in the period 1923–1947: the  (GWR); the  (LMS); the  (LNER); and the  (SR).
 * 1)  The four largest railway companies in the United Kingdom in the period 1923–1947: the  (GWR); the  (LMS); the  (LNER); and the  (SR).