Noun
English Wikipedia has an article on:market makerWikipedia
market maker (plural market makers)
(finance) A person or company that undertakes to quote both a buy and a sell price for a financial instrument.
[Tablets] have not risen to expectations. Apple, the lead market maker in the category, has recently flipped from an emerging market strategy to a cash cow strategy with its latest reduced-price iPad offering, suggesting it now believes that tablets are on life support. Rob Enderle
Electronic communications networks match trades between investors directly, without using a market maker or specialist as an intermediary. Alex Berenson