Acompetent u. s. financial manager must understand the way u. s. stock markets are structured and operate. in the united states, the stock markets consist of primary markets, secondary markets, listed security exchanges, over-the-counter markets, as well as the regulations that monitor these markets. in what market do most u. s. stock market transactions occur? the primary market the secondary market which of the following participants in new york stock exchange (nyse) transactions have the responsibility to make the market when either buyers or sellers are needed? the securities and exchange commission (sec) designated market makers (ddms) supplemental liquidity providers (slps) trading floor brokers true or false: one of the major differences between the new york stock exchange (nyse) and the over-the-counter (otc) markets is that in the nyse, designated market markers make markets and floor brokers act as agents for their customers, while in the otc, dealers make markets and brokers act as agents for their customers. true false