Not strictly speaking a journalistic endeavour this time, but one that still deserved to be added to the collection:

Wikipedia: Big Four (banking)

Big Four is the colloquial name for the four main banks in several countries, where the banking industry is dominated by just four institutions and where the phrase has gained currency.

Oh you! Reminds me of that Westpac campaign in 2009, where I also suggested a possible followup to. I was so witty in those days.