NYSE Chicago

NYSE Chicago was the final operating identity of the Chicago Stock Exchange, a securities market founded in Chicago in 1882. The exchange began as a national securities exchange and self-regulatory organization serving the financial community of the Midwest. It opened to the public on May 15, 1882, after Charles Henrotin was elected its first chairman and president and the organization secured premises on Dearborn Street. During its early years, the exchange sold memberships and developed a substantial market for stocks and bonds. The exchange became closely associated with Chicago's financial district. In 1894 it moved its trading floor to the Chicago Stock Exchange Building at Washington and LaSalle Streets, a structure designed by Adler & Sullivan. Although the building was demolished in 1972, portions of its original trading floor and entrance were preserved at the Art Institute of Chicago. The exchange's early growth was interrupted by events affecting financial markets and the wider economy, including its temporary closure during the First World War and the severe market disruption following the 1929 crash. In 1949, the Chicago Stock Exchange combined with the exchanges of St. Louis, Cleveland, and Minneapolis–St. Paul to form the Midwest Stock Exchange, retaining Chicago as its headquarters. The New Orleans Stock Exchange joined the Midwest Stock Exchange in 1959. The organization later invested heavily in electronic trading and market connectivity. It participated in the Intermarket Trading System, introduced the MAX automated execution system in 1982, added programs for Nasdaq securities in the 1980s, and adopted exchange-traded fund trading in the 1990s. In 1993, it restored the Chicago Stock Exchange name, reconnecting the institution with its original regional identity. The exchange underwent a major structural change in 2005 when regulators approved its demutualization. It moved from a not-for-profit, member-owned structure to a for-profit corporation owned through CHX Holdings, Inc. It also introduced the Electronic Book platform and completed migration to the CHX Matching System, an electronic order-matching platform. Investments by Bank of America, Bear Stearns, E*TRADE Financial, and Goldman Sachs followed in 2006, with JPMorgan Chase later associated with the ownership group after acquiring Bear Stearns. A proposed 2016 sale of CHX Holdings to Chongqing Casin Enterprise Group became the subject of political and regulatory scrutiny and was ultimately blocked by the U.S. government in February 2018. Intercontinental Exchange, the parent of the New York Stock Exchange, then agreed to acquire the exchange. The transaction closed in July 2018, and the Chicago Stock Exchange was rebranded as NYSE Chicago in February 2019. Under NYSE ownership, the venue operated as an electronic-only market with a comparatively narrow focus, including trading activity associated with hedge funds. Its CHX SNAP product used a sub-second, non-displayed auction mechanism intended to support larger trades while reducing the informational and speed advantages available to a small number of high-frequency participants. The exchange ceased to exist as an independent operating venue by the end of 2019. In February 2025, NYSE announced plans to close the remaining Chicago office and move related operations to Dallas, where it proposed creating NYSE Texas. Accordingly, NYSE Chicago is best understood as the final brand and institutional successor of the historic Chicago Stock Exchange rather than an active standalone exchange.

The Chicago Stock Exchange was established at a formal meeting on March 21, 1882, with Charles Henrotin chosen as chairman and president. The exchange leased space at 115 Dearborn Street and sold hundreds of memberships during its first year. It opened to the public on May 15, 1882, and quickly became part of Chicago's growing securities market. In 1894, it moved its trading floor to the Chicago Stock Exchange Building at Washington and LaSalle Streets, designed by Adler & Sullivan. The building was demolished in 1972, although important interior elements were preserved at the Art Institute of Chicago. The exchange experienced both expansion and disruption during the twentieth century. It closed temporarily in July 1914 during the First World War and reopened on December 11 of that year. In 1915 it changed the basis on which securities were quoted and traded, and in 1920 it established the Chicago Stock Exchange Stock Clearing Corporation. The 1929 market crash created a prolonged difficult period for the exchange and the U.S. securities industry more broadly. In 1949, the Chicago Stock Exchange merged with exchanges in St. Louis, Cleveland, and Minneapolis–St. Paul to create the Midwest Stock Exchange. Chicago remained the headquarters. The New Orleans Stock Exchange joined the organization in 1959, and the Midwest Stock Exchange Service Corporation was created in the early 1960s to centralize accounting services for member firms. In 1978, the exchange introduced access to the Intermarket Trading System, allowing orders to be routed between exchanges in pursuit of better execution. It continued its transition toward automation with the MAX system in 1982 and programs for trading Nasdaq securities in 1987. The institution experienced a revival in the 1990s and restored the Chicago Stock Exchange name in 1993. It began trading exchange-traded funds in 1997. The new century brought further technological and corporate changes. In 2005, the SEC approved demutualization, replacing the member-owned not-for-profit structure with a for-profit corporation owned through CHX Holdings. The exchange introduced its Electronic Book platform and completed migration to the CHX Matching System in 2006. That year, several large financial firms invested in the exchange. In 2016, CHX Holdings agreed to be acquired by Chongqing Casin Enterprise Group. The proposed deal raised concerns about foreign ownership and national-security implications. It remained pending through 2017, while regulators reviewed the transaction, and was blocked in February 2018. ICE subsequently agreed to buy the exchange, completing the acquisition in July 2018. The exchange was renamed NYSE Chicago in February 2019. As an NYSE-affiliated venue, NYSE Chicago operated electronically and served a relatively specialized market. Its CHX SNAP product, approved by the SEC in 2015 and introduced in 2016, used a sub-second non-displayed auction to facilitate larger trades while attempting to limit the advantages created by speed and information asymmetry. Public companies did not need to be listed on the venue for their shares to trade there, because the exchange could trade securities listed on other U.S. exchanges under applicable SEC rules. The independent exchange ceased operating by the end of 2019. In 2025, NYSE announced plans to close the remaining Chicago office and shift operations to Dallas for a proposed NYSE Texas platform.

1. 2025NYSE announces Chicago-to-Dallas relocation plan

   NYSE announced plans to close the small Chicago office and establish proposed NYSE Texas operations in Dallas.

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2. 2019Rebranded as NYSE Chicago

   The exchange adopted the NYSE Chicago identity within the ICE and NYSE group.

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3. 2018Acquired by Intercontinental Exchange

   ICE acquired the Chicago Stock Exchange after the proposed Casin transaction was blocked.

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4. 2016CHX SNAP introduced

   The exchange rolled out its sub-second, non-displayed auction product for larger securities transactions.

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5. 2006CHX Matching System migration completed

   The exchange completed migration to its New Trading Model platform and announced investments from major financial institutions.

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6. 2005Demutualization approved

   The SEC approved the conversion from a member-owned not-for-profit organization to a for-profit corporate structure.

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7. 1997ETF trading begins

   The exchange added exchange-traded funds to its trading activities.

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8. 1993Chicago Stock Exchange name restored

   The Midwest Stock Exchange returned to the Chicago Stock Exchange name.

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9. 1982MAX automated execution system launched

   The MAX system made the exchange one of the early U.S. venues to provide fully automated order execution.

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10. 1978Intermarket Trading System introduced

    The exchange gained a mechanism for routing orders between markets to seek better execution.

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11. 1949Formation of the Midwest Stock Exchange

    The Chicago exchange merged with exchanges in St. Louis, Cleveland, and Minneapolis–St. Paul.

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12. 1894Move to the Chicago Stock Exchange Building

    The exchange moved its trading floor to the Adler & Sullivan-designed building at Washington and LaSalle Streets.

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13. 1882Chicago Stock Exchange founded and opened

    The exchange was formally organized in March and opened to the public on May 15 under founding president Charles Henrotin.

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A regulated electronic U.S. equity trading venue with historic Chicago roots, ultimately positioned within the NYSE group as a specialized and relatively small market rather than a broad full-service exchange.

• CHX Matching SystemElectronic trading platform2006

  The CHX Matching System was the exchange's electronic order-matching platform and the successor to its Electronic Book technology. It supported automated execution for securities traded through the venue and formed the core of the exchange's later electronic-only operating model.

• CHX SNAPNon-displayed auction2016

  CHX SNAP, short for Sub-second Non-displayed Auction Process, was designed to aggregate orders into brief auctions for larger securities trades. Its stated purpose was to reduce the speed and information advantages available to a limited set of market participants while retaining an electronic execution process.

• Exchange-traded fund tradingSecurities trading1997

  The exchange began trading ETFs in 1997, adding a growing class of listed investment products to its traditional stock-trading activity. As with other securities handled by the venue, the traded instruments could be listed on another U.S. exchange.

• Intermarket Trading SystemOrder-routing network1978

  Introduced at the Chicago exchange in 1978, the Intermarket Trading System enabled orders to be sent between participating exchanges. It was intended to help customers obtain better available execution across connected U.S. markets.

• 2025Plan to relocate operations from Chicago to DallasStrategy

  The Chicago operation had become a small electronic venue after the exchange's independent operating history ended.

  What changed. NYSE announced plans to close the remaining Chicago office and move operations to Dallas for a proposed NYSE Texas platform.

  Aftermath. The plan marked the effective end of the NYSE Chicago identity as a continuing Chicago-based exchange operation.

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• 2018Accept acquisition by Intercontinental ExchangeM&A

  A previous proposed sale to Chongqing Casin Enterprise Group had been delayed by regulatory and political concerns and was blocked in February 2018.

  What changed. Intercontinental Exchange agreed to acquire the Chicago Stock Exchange and completed the transaction in July 2018.

  Aftermath. The exchange was rebranded NYSE Chicago in February 2019 and was operated within the NYSE group.

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• 2016Launch CHX SNAPProduct launch

  The exchange sought to offer a trading mechanism for larger orders that could limit the advantages associated with speed and information asymmetry.

  What changed. It launched CHX SNAP, a sub-second non-displayed auction product that had received SEC approval in 2015.

  Aftermath. CHX SNAP became a distinctive feature of the exchange's specialized electronic-market proposition.

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• 2006Complete migration to the CHX Matching SystemStrategy

  The exchange sought to modernize its execution infrastructure and replace earlier electronic-book technology.

  What changed. CHX completed migration to the New Trading Model platform, known as the CHX Matching System.

  Aftermath. The platform became the technical foundation for the exchange's later electronic-only operations.

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• 2005Convert the exchange to a for-profit corporate structureStrategy

  The exchange was historically member-owned and operated on a not-for-profit basis. Its competitive environment and technology investment needs encouraged a corporate ownership structure.

  What changed. The SEC approved demutualization, with the exchange operating as a subsidiary of CHX Holdings, Inc.

  Aftermath. The new structure enabled outside institutional investment and preceded later ownership changes, including the ICE acquisition.

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• 2025NYSE announces plans to relocate Chicago operations to Dallas

  NYSE announced plans to close the small Chicago office and move operations to Dallas as part of a proposed NYSE Texas platform.

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• 2019Chicago Stock Exchange rebrands as NYSE Chicago

  Following the ICE acquisition, the exchange adopted the NYSE Chicago name and operated as an electronic-only venue.

  OtherLeadership change
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• 2018Government blocks proposed Casin acquisition

  The proposed sale of CHX Holdings to the Chinese-led Casin investment group was blocked after prolonged review and SEC reservations.

  M&ARegulation
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• 2018Intercontinental Exchange completes acquisition of Chicago Stock Exchange

  Intercontinental Exchange acquired the 136-year-old exchange, bringing it into the corporate group that owns the NYSE.

  M&A
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• 2016Casin Group agrees to acquire Chicago Stock Exchange parent

  Chongqing Casin Enterprise Group entered into an agreement to acquire CHX Holdings, but the proposed transaction faced political and regulatory opposition.

  M&ARegulation
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• 2006CHX announces investment by major financial institutions

  Bank of America, Bear Stearns, E*TRADE Financial, and Goldman Sachs were announced as investors in the exchange.

  M&AOther
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• 2005Chicago Stock Exchange adopts a demutualized ownership structure

  The SEC approved the exchange's transition from a not-for-profit, member-owned organization to a for-profit corporation owned through CHX Holdings.

  Other
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1. Chicago Stock Exchange
2. NYSE