1970s: Madoff Pioneers PFOF
Bernie Madoff's brokerage begins paying broker-dealers for retail order flow, creating the first systematic PFOF arrangement in U.S. markets. The practice is controversial from the start but is not prohibited.
1990s: SEC Investigates, Chooses Disclosure
The SEC investigates PFOF and determines to address it through disclosure requirements rather than prohibition. Rule 11Ac1-3 (predecessor to Rule 606) requires brokers to disclose PFOF arrangements. This regulatory choice establishes the framework that persists today.
2000s: Citadel Securities Enters the Market
Citadel Securities is founded in 2002 and begins building its retail market-making franchise. The firm invests heavily in technology and PFOF-based order flow capture, growing its market share through competitive PFOF payments.
2013–2019: Robinhood Era and Zero Commissions
Robinhood launches in 2013 with zero commissions funded by PFOF. By 2018, 40% of Robinhood's revenue comes from PFOF. In 2019, major discount brokers eliminate commissions, making PFOF the dominant revenue model for retail brokerage across the industry. Citadel Securities reportedly pays Robinhood $1.5 billion in PFOF in 2020 alone.
2020–2024: Reform Attempts and Regulatory Actions
The 2020 Robinhood SEC settlement ($65M) and the 2021 GameStop episode bring PFOF to national attention. The SEC under Chair Gensler proposes significant market structure reforms in 2022. Citadel Securities faces multiple regulatory actions including FINRA censures. Reform proposals are ultimately scaled back. The debate continues.