Speaking of funny things, why don't you look at this: http://www.investopedia.com/ask/answers/128.asp Another funny thing, so what is this? https://www.kcg.com/market-making/kcgs-designated-market-maker-dmm And this: Quote: IMC is a leading Designated Market Maker (DMM) on the New York Stock Exchange (NYSE) See here: http://www.imc.nl/financialmarkets/designatedmarketmaking And here: https://www.google.com/?gfe_rd=cr&ei=lFJmVNjeK4um8wef1IDACA&gws_rd=cr&fg=1#q=NYSE+market+makers