I cannot think of the free t-shirts any longer but can only remember that Jane Street trades are equivalent to 1/7TH OF THE COMBINED EQUITY, BOND, CURRENCY AND COMMODITY TRADING REVENUES OF ALL THE MAJOR GLOBAL INVESTMENT BANKS
not just A bank, not just all US banks, but ALL THE MAJOR GLOBAL INVESTMENT BANKS
https://www.ft.com/content/54671865-4c7f-4692-a879-867ef68f0bde