其它單純的 discount brokers 最多就是把你下的單子賣給別的交易所去成交， IB 本身即是券商，也是自己參與交易的莊家之一，尤其是股票期權上的大莊家。IB 老板是做軟件出身的，是推動市場向電子交易的先驅之一。我猜在IB下的單子很大比例都是內部被IB本身的交易軟件給 match 了，至於是不是最好價錢，說不清
Thomas Peterffy
https://en.wikipedia.org/wiki/Thomas_Peterffy
Interactive Brokers Group, Inc. (IB) is an online discount brokerage firm in the United States. The company traces its origin to 1977 when Peterffy bought a seat on the American Stock Exchange as an individual market maker, and formed T.P. & Co. the following year. IB consists of many subsidiaries operating on most major stock, futures,bonds, forex, and options exchanges worldwide.
OneChicago[edit]
Main article: OneChicago
OneChicago is an all-electronic exchange owned jointly by IB Exchange Group (IB), Chicago Board Options Exchange (CBOE), and CME Group. It is a privately held company that is regulated by both the Securities and Exchange Commission and the Commodity Futures Trading Commission.
Boston Options Exchange[edit]
Main article: Boston Options Exchange
Peterffy was involved in the founding of the Boston Options Exchange (BOX). BOX is an automated stock exchange owned and operated by the TMX Group. As an equity options market, it provides electronic order matching services to stockbrokers and traders.
