Market Data
IEX’s market data allows users to see real-time orders and trades that are sent to and
executed on the IEX Exchange Order Book, for both equities and options markets. IEX’s proprietary market data feeds are designed to provide transparency and enable a high level of performance without leaking information. Anyone interested in receiving one of IEX’s Real-Time Market Data feeds can either connect directly to IEX or receive our data through one of our wide selections of third-party market data provider partners. Visit our Market Data Resources page to get access to IEX Market Data today.
Equities Data Solutions
Equities TOPS
Real-time top of book quotations and last sale data from IEX equities trading.
Equities DEEP
Price aggregated, real-time depth of book quotations from IEX equities trading.
Equities DEEP+
Real-time depth of book quotations from lEX equities trading.
Order-by-order view of resting displayed orders.
Equities HIST
Free historical data downloads from IEX equities available on a T+1 basis.
IEX Stats Page
A free resource offering access to IEX-specific statistics, including exchange volume
history and performance data for the IEX Router and the IEX Exchange Retail Program.
Equities Connectivity
IEX offers connectivity to the exchange via physical ports as well as logical ports (also called trading sessions), which are used by broker-dealers to submit orders.
Options Data Solutions
Options TOPS
IEX Options TOPS is a real-time market data feed that provides top-of-book quotations
and last sale information directly from IEX options.
Options DEEP
Real-time depth of book quotations from lEX options
Options HIST
Free historical data downloads from IEX options available on a T+1 basis.
Options Connectivity
IEX offers connectivity to the exchange via physical ports as well as logical ports (also called trading sessions), which are used by broker-dealers to submit orders. For Options, IEX will also offer both Market Maker quoting logical ports as well as purge ports for quote management.
Equities Top of Book Quote and Last Sale (TOPS) Feed
TOPS is used to receive real-time top of book quotations direct from IEX equities. The quotations received via TOPS provide an aggregated size and do not indicate the size or number of individual orders at the best bid or ask. Non-displayed orders and non-displayed portions of reserve orders are not represented in TOPS. TOPS also provides last trade price and size information. Trades resulting from either displayed or non-displayed orders matching on IEX are reported. Routed executions are not reported.
Equities Depth of Book and Last Sale (DEEP) Feed
DEEP is used to receive real-time depth of book quotations direct from IEX equities. The depth of book quotations received via DEEP provide an aggregated size of resting displayed orders at a price and side, and do not indicate the size or number of individual orders at any price level. Non-displayed orders and non-displayed portions of reserve orders are not represented in DEEP.
DEEP also provides last trade price and size information. Trades resulting from either displayed or non-displayed orders matching on IEX are reported. Routed executions are not reported.
Equities Order-by-Order Depth of Book and Last Sale (DEEP+) Feed
DEEP+ is used to receive real-time depth of book quotations direct from IEX equities. The depth of book quotations received via DEEP+ provide an order-by-order view of resting displayed orders. Non-displayed orders and non-displayed portions of reserve orders are not represented in DEEP+.
DEEP+ also provides last trade price and size information. Trades resulting from either
displayed or non-displayed orders matching on IEX Exchange are reported. Routed
executions are not reported. IEX will be launching a channelized version of this feed
soon. Learn more.
The IEX API, TOPS Viewer, and Stocks App were retired on November 18, 2021.
Please see SR-IEX-2021-13 or IEX Trading Alert #2021 – 039 for more information.
Equities Historical Data (HIST) Download
HIST is used to download historical data from IEX equities. Data is available for free download on a T+1 basis. Additionally, the most recent twelve months of data are also available to download. By accessing or using IEX Historical Data, you agree to the IEX Historical Data Terms of Use.
Options Top of Book Quote and Last Sale (TOPS) Feed
IEX Options TOPS offers real-time top of book quotations directly from IEX Options. The quotations received via TOPS provide an aggregated size and do not indicate the size or number of individual orders at the best bid or ask. Non-displayed orders and non-displayed portions of reserve orders are not represented in TOPS. TOPS also provides last trade price and size information. Trades resulting from either displayed or non-displayed orders matching on IEX Equities or IEX Options are reported. Routed executions are not reported.
Options Order-by-Order Depth of Book and Last Sale (DEEP) Feed
IEX Options DEEP offers real-time depth of book quotations directly from IEX Options. The depth of book quotations received via IEX Options DEEP provide an order-by-order view of resting displayed orders. Non-displayed orders and non-displayed portions of reserve orders are not represented. DEEP also provides last trade price and size information. Trades resulting from either displayed or non-displayed orders matching on IEX Options are reported. Routed executions are not reported.
Become a Vendor
IEX values the important role Market Data and Connectivity vendors play in capital markets bringing critical infrastructure, data, tools and analytics to the full spectrum of participants across the ecosystem of trading and data.
Interested in becoming a Market Data and Connectivity vendor with IEX? Learn more below about what IEX has to offer.
About the program:
The External Distribution Rebate program rewards distributors who bring new clients to IEX Market Data by letting you share directly in our growth:
- The program will run September 1, 2026 through August 31, 2028.
- Earn a 75% rebate on our market data revenue from each qualified new client you onboard.
- Earn rebates on qualified new clients for the duration of the program, through August 31, 2028, with no cap on earnings.
- Simple onboarding and a transparent, straightforward attribution process.
Eligible products under the program include:
- IEX TOPS™
- IEX DEEP®
- IEX DEEP+™
IEX Growth
7.8%
(As of Q1 2026)
3rd
5x
How to Participate
- Connect & onboard — If you are not an existing distributor, establish connectivity to IEX market data, directly or through an approved vendor. Review our connectivity agreements and forms.
- Enroll in the program — execute the required market data agreements and formally opt into the External Distribution Rebate Program by checking the opt in box on the Exhibit A, or Extranets can opt in via the Extranet addendum.
- Register referrals — for each new IEX client, submit an updated Exhibit A identifying the client and confirm referral attribution with IEX.
- Grow together — partner with us on co-marketing, joint client calls, event sponsorships, and other initiatives to drive adoption.
Ready to learn more?
Program terms and eligibility are subject to the External Distribution Rebate Program agreement and related market data terms and conditions.
Fees
At IEX, we believe that exchange fees should be charged fairly and transparently.
We believe it is critical that market data and connectivity fees be based on costs incurred by the provider (with a reasonable markup) because exchanges’ monopolistic positions create a potential for abusive pricing practices. Where we have determined that fees are appropriate, we have led the industry in providing data and analysis demonstrating how those fees are related to our costs, and provided sufficient time for the industry to evaluate the potential impact of those fees and comment publicly if they choose.