Exchange

Broadly, a stock exchange, futures exchange, or any other organised venue which brings together bids and offers in certain types of securities and doesn’t look like an over-the-counter transaction. In the EU parlance (MiFID and all that kind of jazz) called a Regulated Market, and usually contrasted with a systematic internaliser (where a broker matches buys and sells on an OTC basis in its own order book). The question is whether a dark pool, a kind of multilateral trading facility counts as an exchange.