Corporate brand
UnclaimedIEX is a United States stock exchange created to reduce the speed advantages associated with certain high-frequency trading strategies.
Last updated August 22, 2026
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Overview
IEX, short for Investors Exchange, is a United States equities trading venue established in 2012 by Brad Katsuyama and Ronan Ryan. It was created in response to concerns about market fragmentation, unequal access to trading information, and high-frequency trading practices that could allow technologically advanced participants to react to orders faster than conventional investors. The exchange became widely known after Michael Lewis discussed its development in the 2014 book Flash Boys: A Wall Street Revolt. IEX initially operated as an alternative trading system and opened for trading on October 25, 2013. Its most distinctive technical feature is a 38-mile coil of optical fiber installed in New Jersey in front of its matching engine. The coil introduces a delay of approximately 350 microseconds in one direction, or roughly 700 microseconds on a round trip. IEX describes this mechanism as a “speed bump.” The purpose is to reduce the advantage of participants that use extremely fast connections to detect and react to orders as they move among trading venues. IEX also does not offer conventional co-location beside its matching engine, does not pay for order flow, and aims to make market-data delivery occur on a more even basis across its access points. The exchange emphasizes relatively simple and transparent trading rules. It publishes its matching logic and supports a limited set of familiar order types, including market, limit, primary peg, midpoint peg, and discretionary peg orders. The discretionary peg can seek execution at the midpoint when market conditions permit. Unlike many venues that use complex pricing schedules and liquidity rebates, IEX has generally promoted fixed or straightforward transaction pricing. Its stated positioning is based on neutrality, transparency, and reducing the ability of speed-sensitive strategies to exploit slower participants. The U.S. Securities and Exchange Commission approved IEX as a national securities exchange on June 17, 2016. In October 2017, the SEC separately approved IEX Group to list companies. IEX launched its listing business with an unusually low proposed fee structure, offering free listings for the first five years and then a flat annual fee of $50,000. Interactive Brokers became the first company to list publicly on IEX on October 5, 2018. The listing business did not develop as planned, however, and IEX announced in September 2019 that it would leave the listing business. IEX continues to operate as an equities exchange rather than as a general-purpose listing competitor to the New York Stock Exchange and Nasdaq. The company has also developed market-data and technology services. IEX Cloud provided an application programming interface for United States and Canadian financial data, but the service ceased operating in August 2024. In 2020, Caisse de dépôt et placement du Québec made a strategic investment in IEX. The exchange remains associated with a market-structure reform agenda that favors transparent rules and equalized access over maximum execution speed. Its approach has attracted support from investors and critics of high-frequency trading, while some liquidity providers and high-frequency trading advocates have argued that speed restrictions may reduce liquidity or increase execution costs.
History
IEX was founded in 2012 by Brad Katsuyama and Ronan Ryan. Its creation followed concerns that the increasingly fragmented United States equity market gave high-frequency trading firms technological advantages over brokers, institutions, and individual investors. The early development of the venue was later popularized by Michael Lewis’s 2014 book Flash Boys: A Wall Street Revolt, which presented IEX as an attempt to reform market structure through transparency and controlled latency. IEX began operating as an alternative trading system and opened for trading on October 25, 2013. Before becoming a national securities exchange, it operated a dark pool with a distinctive order-priority approach. That earlier system used price priority followed by broker and then time, rather than relying exclusively on the conventional price-time sequence. Katsuyama argued that this could protect ordinary investors from faster firms moving ahead in the order queue. When IEX sought formal exchange status, it abandoned the broker-priority feature and adopted price-time priority as required for its exchange model. The central technical element of IEX is a fiber-optic coil placed before the trading engine. The approximately 38-mile cable adds about 350 microseconds of one-way latency and approximately 700 microseconds on a round trip. IEX calls this a speed bump. It is intended to make it harder for participants to observe an order moving between venues and react before the original order can be completed. The exchange also seeks to avoid advantages associated with physical proximity by not permitting ordinary customer co-location beside its matching engine. Its operating model includes published matching rules, a relatively small number of order types, synchronized access points, and no payment for order flow. The Securities and Exchange Commission approved IEX as a national securities exchange on June 17, 2016. The approval gave the company formal exchange status and placed its trading operations within the regulatory framework applicable to United States national securities exchanges. IEX subsequently recruited Sara Furber to lead its effort to attract company listings. On October 24, 2017, the SEC approved IEX Group’s application to list companies. IEX proposed to compete with established listing venues through simple pricing, initially offering five years of free listings followed by a flat annual charge of $50,000. Interactive Brokers became the first company to list on IEX on October 5, 2018. The listing strategy was short-lived. On September 23, 2019, IEX announced its departure from the listing business. The announcement left the exchange focused primarily on secondary-market trading and market-structure technology rather than on becoming a full-scale primary listing venue. In the same year, IEX announced that co-founder and Chief Operating Officer John Schwall would retire by the end of 2019. IEX expanded beyond exchange trading through IEX Cloud, an API service that supplied United States and Canadian stock data to developers and financial-technology users. IEX Cloud ceased operations in August 2024. In 2020, Caisse de dépôt et placement du Québec made a strategic investment in IEX, providing institutional backing while the exchange continued its independent market-structure proposition. The exchange’s approach has remained controversial as well as influential. Supporters view the speed bump, limited order types, and absence of payment for order flow as mechanisms for improving fairness and reducing latency-driven trading behavior. Critics, including representatives of high-frequency trading interests, have argued that restricting speed can impair liquidity, increase trading costs, and weaken price discovery. A similar speed-bump concept was later adopted by NYSE American after the SEC approved IEX’s exchange model. IEX continues to present itself as a transparent and investor-oriented United States equities venue.
- 2024
IEX Cloud shuts down
[1]The IEX Cloud financial-data API service ceases operations in August.
- 2020
Strategic investment by CDPQ
[1]Caisse de dépôt et placement du Québec makes a strategic investment in IEX.
- 2019
Exit from listing business
[1]IEX announces that it will discontinue its company-listing business.
- 2018
First public-company listing
[1]Interactive Brokers becomes the first public company listed on IEX on October 5.
- 2017
Listing approval
[1]The SEC approves IEX Group to list companies on October 24.
- 2016
National exchange approval
[1]The SEC approves IEX as a national securities exchange on June 17.
- 2013
IEX begins trading
[1]IEX opens for trading on October 25 as an alternative trading system.
- 2012
IEX is founded
[1]Brad Katsuyama and Ronan Ryan establish IEX to address perceived disadvantages created by high-frequency trading and fragmented market infrastructure.
Products and positioning
A transparent, investor-oriented equities exchange designed to limit speed-based advantages and reduce certain forms of latency arbitrage.
Stock exchange · 2016
IEX Exchange
IEX’s principal offering is a regulated United States equities exchange for order execution. Its market-structure design combines published matching rules, a limited selection of order types, fixed or straightforward transaction pricing, and an engineered latency delay. The exchange’s 38-mile fiber coil introduces approximately 350 microseconds of one-way delay before orders reach the matching engine. IEX uses the mechanism to reduce certain speed-based advantages and to make it more difficult for traders to react to order information faster than the originating participant.
Equity order type
IEX Discretionary Peg
The Discretionary Peg is an IEX order type based on a primary peg that can seek execution at prices up to the midpoint when the quote is considered stable. It is intended to provide additional execution discretion without requiring the broad and complex menu of order types found on many competing venues.
Financial-data API
IEX Cloud
IEX Cloud was an API service that enabled developers and other users to query United States and Canadian stock-market data. It extended the IEX brand beyond exchange execution into financial-data infrastructure, but the service ceased operating in August 2024.
Company-listing service · 2017
IEX Listings
IEX briefly offered a company-listing service after receiving SEC approval in 2017. Its proposed commercial model included free listings for an initial five-year period followed by a flat annual fee. Interactive Brokers was the first company to list on the venue in 2018. IEX announced its withdrawal from the listing business in 2019.
Brand decisions
2024
Discontinue IEX CloudStrategyBackground
IEX Cloud provided developer access to United States and Canadian market data as an extension of the IEX technology offering.
Action taken
IEX Cloud ceased operating in August 2024.
Aftermath
The IEX brand returned to a narrower focus centered on exchange trading and market structure.
2019
Withdraw from the company-listing businessStrategyBackground
IEX’s attempt to build a primary listing franchise produced one public-company listing and did not become a durable rival to the major listing exchanges.
Action taken
On September 23, IEX announced that it would leave the listing business.
Aftermath
The company refocused its identity on secondary-market equity trading and market-structure technology.
2017
Launch a company-listing venueProduct launchBackground
After receiving exchange approval, IEX sought to compete with established United States listing venues and provide issuers with an alternative.
Action taken
The SEC approved IEX Group’s listing application, and IEX proposed free listings for five years followed by a flat annual fee of $50,000.
Aftermath
Interactive Brokers became the first listed company in 2018, but IEX announced its departure from the listing business in 2019.
Proposed annual listing fee after initial free period. $50,000 (Announced in 2017)
2016
Convert to a national securities exchangeStrategyBackground
IEX had initially operated as an alternative trading system and sought formal exchange status to run a regulated national securities exchange.
Action taken
The SEC approved IEX as a national securities exchange on June 17, 2016.
Aftermath
The approval enabled IEX to operate within the national-exchange framework and supported its subsequent attempt to attract company listings.
Recent events
- Unconfirmed
Reported
SEC approves changes to IEX retail program[3]
The U.S. Securities and Exchange Commission approved enhancements IEX Exchange sought for its Retail Price Improvement Program, including offering midpoint prices to retail investors and allowing more interaction with institutional investors.
Reported
IEX announces Indian Gas Exchange platform launch plan[4]
IEX was reported to be planning to launch the Indian Gas Exchange trading platform; the supplied article says the applicable norms had not yet been framed.
Sources4 sources
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