The Securities Industry Automation Corporation (SIAC) is a subsidiary of the

NYSE Euronext NYSE Euronext, Inc. was a transatlantic multinational financial services corporation that operated multiple securities exchanges, including the New York Stock Exchange, Euronext and NYSE Arca (formerly known as ArcaEx). NYSE merged with Archi ...

. Its purpose is to provide technical services for the exchanges themselves, members and other financial institutions. In this role, SIAC provides the computers and other systems required to run the exchanges. It also owns communication lines and hardware to provide real-time quotes and transaction information to all market participants from the Consolidated Tape/Ticker System (CTS),

Consolidated Quotation System The Consolidated Quotation System (CQS) is the electronic service that provides quotation information for stock traded on the American Stock Exchange, New York Stock Exchange, and other regional stock exchanges in the United States and also inclu ...

(CQS), and

Options Price Reporting Authority The Options Price Reporting Authority (OPRA) provides, through market data vendors, last sale information and current options quotations from a committee of participant exchanges designated as the Options Price Reporting Authority. OPRA is a ...

(OPRA).

Origins

SIAC was created on July 17, 1972, as a wholly owned subsidiary of the

NYSE The New York Stock Exchange (NYSE, nicknamed "The Big Board") is an American stock exchange in the Financial District of Lower Manhattan in New York City. It is by far the world's largest stock exchange by market capitalization of its liste ...

and

American Stock Exchange NYSE American, formerly known as the American Stock Exchange (AMEX), and more recently as NYSE MKT, is an American stock exchange situated in New York City. AMEX was previously a mutual organization, owned by its members. Until 1953, it was know ...

. The NYSE owned two thirds of SIAC, while the AMEX owned one third. On November 1, 2006, NYSE Euronext purchased AMEX's stake for $40 million.{{cite web, title=US Securities and Exchange Commission, url=https://www.sec.gov/Archives/edgar/data/1326579/000088237706003784/d586393.htm, website=www.sec.gov

References

Companies based in New York City Intercontinental Exchange