Financial Information eXchange (FIX): Definition and Users

What Is the Financial Information eXchange (FIX)?

The Financial Information eXchange (FIX) is a vendor-neutral electronic communications protocol for the international real-time exchange of securities transaction information. The protocol is used by the FIX community, which includes nearly 300 member firms including all major investment banks.

The FIX has become the de-facto messaging standard for pre-trade, trade, and post-trade communication, as well as for U.S. regulatory reporting. It is compatible with almost every commonly used network technology. FIX Protocol, Ltd. owns and maintains the FIX system. The company was formed entirely to fulfill that purpose and to ensure the system remains in the public domain.

Key Takeaways

  • The Financial Information eXchange (FIX) is an information and data protocol used to disseminate price and trade information among investment banks and broker-dealers.
  • The FIX Trading Community is the non-profit entity created to ensure FIX continues in the public domain.
  • The FIX is the standard for front-office messaging.

Understanding the Financial Information eXchange (FIX)

The FIX's communications include texting and email, securities trade allocations, news, order submissions and changes, trade advertising, and execution reporting. Mostly used for business-to-business (B2B) interactions, it is designed to improve business messages and transaction flow.

The FIX achieves this goal by minimizing redundancy and reducing time spent on telephone communications, written messages, transactions, and documentation. The benefits are particularly obvious to funds, investment managers, and investment banking firms. FIX systems transfer accurate and timely financial information concerning securities trades through and across security exchange houses.

Introduced in 1992 for equity trading between Salomon Brothers and Fidelity Investments, the FIX protocol was implemented to provide for more efficient and accountable transactions and record-keeping, replacing a system that was handled mostly over the phone. Under the old system, indications of interest were often lost "on hold" or routed to the wrong trader.

The FIX has since gone on to become the standard electronic protocol for pre-trade, trade, and post-trade communication in equity markets and is increasingly being used in other markets, too.

The Society for Worldwide Interbank Financial Telecommunication (SWIFT) is the standard for back office messaging, while the FIX is the standard for front office messaging.

Financial Information eXchange (FIX) Users

The FIX is popular among both the buy-side (institutions) as well as the sell-side (brokers/dealers) of the financial markets. Users include mutual funds, investment banks, brokers, stock and futures exchanges, and other electronic communication networks (ECNs). It is mainly used for equity transactions, although it can handle bond, foreign exchange, and derivatives transactions.

The FIX Trading Community member firms maintain and continue to develop the FIX messaging standard. Community members include several leading financial institutions around the globe. Work done by these member firms ensures the standard continues to evolve to meet new and emerging trading requirements.

Their actions also promote the adoption of FIX use worldwide. The FIX protocol itself is a non-proprietary, free, and open standard that is constantly being developed by its member firms.

What's Next for the FIX?

The FIX is an ever-changing entity and seeks to stay current with changes in the industry and in technology. In recent years, members have been discussing current issues and challenges, which include cybersecurity, digital currencies and blockchain, execution transparency, and performance improvements.

Any firm considering using the FIX may wish to download the FIX implementation guide from the FIX Trading Community website.

Article Sources
Investopedia requires writers to use primary sources to support their work. These include white papers, government data, original reporting, and interviews with industry experts. We also reference original research from other reputable publishers where appropriate. You can learn more about the standards we follow in producing accurate, unbiased content in our editorial policy.
  1. FIX. "What is FIX Trading Community?" Accessed May 19, 2021.

  2. FIX. "About." Accessed May 19, 2021.

Take the Next Step to Invest
The offers that appear in this table are from partnerships from which Investopedia receives compensation. This compensation may impact how and where listings appear. Investopedia does not include all offers available in the marketplace.