Payment for Order Flow (PFOF)
Payment for Order Flow (PFOF)
Payment for Order Flow (PFOF) is the compensation and financial rebate a retail brokerage firm receives from a third-party market maker (wholesale market maker) in exchange for routing its clients' trade orders to that market maker for execution, rather than sending them directly to a public stock exchange (such as the NYSE or NASDAQ).
How PFOF Works
- Order Placement: A retail trader enters an order (e.g., to buy or sell equities or options) through their retail broker.
- Order Routing: Instead of routing the order directly to a public lit exchange, the broker routes the order to a wholesale market maker (e.g., Citadel Securities, Virtu Financial, Two Sigma).
- Execution & Spread Capture: The wholesaler internalizes and executes the trade. Wholesalers profit by capturing a portion of the bid-ask spread. Because retail trades are typically smaller, non-directional, and carry lower adverse-selection risk ("uninformed flow") compared to institutional flow, market makers can profitably facilitate these trades with lower inventory risk.
- Rebate / Kickback: The market maker sends a small per-share or per-contract rebate back to the retail broker as payment for directing that trade flow to them.
Key Mechanics: NBBO & Price Improvement
Under SEC Rule 606 and Rule 607, as well as regulatory Duty of Best Execution mandates:
- NBBO Compliance: Market makers executing PFOF orders are legally required to execute the trade at or better than the National Best Bid and Offer (NBBO).
- Price Improvement: In many instances, market makers offer sub-penny price improvement (e.g., executing a buy order slightly below the national ask price or a sell slightly above the national bid price), theoretically saving the trader money relative to the prevailing public quote.
Implications for Day Traders and Active Traders
| Aspect | Benefit / Pro | Drawback / Con |
|---|---|---|
| Commission Model | Enabled the proliferation of $0 commission trading on retail platforms by subsidizing broker overhead. | Indirect costs may be hidden within execution quality rather than clear commission line items. |
| Execution Speed & Latency | Efficient for simple buy-and-hold investing and standard market/limit orders on liquid names. | Additional routing hops and internal matching engines can introduce microsecond-to-millisecond latency for momentum/breakout scalpers. |
| Fill Quality & Liquidity | Retail orders frequently receive small price improvement compared to wide public lit spreads. | Risk of inferior fills during high-volatility events, fast market conditions, or thinly traded securities where direct exchange access (DMA) or specific dark pool routing is advantageous. |
| Order Routing Control | Zero configuration required for passive investors. | Traders generally cannot choose specific routing venues, access maker-taker rebates directly, or route to specific ECNs unless using a direct-market-access (DMA) broker. |
Related Terms
- Bid-Ask Spread: The difference between the highest price a buyer is willing to pay and the lowest price a seller is willing to accept.
- National Best Bid and Offer (NBBO): The SEC-mandated quote showing the highest current bid price and lowest offer/ask price across all major exchanges.
- Direct Market Access (DMA): A mechanism allowing advanced traders to bypass intermediaries and route orders directly to specific exchanges, dark pools, or ECNs.
- Internalization: The practice where a broker or market maker fills an order from its own inventory rather than routing it to an external exchange.
- Maker-Taker Model: A pricing structure used by exchanges that pays a rebate to traders who provide (make) liquidity and charges a fee to those who take (remove) liquidity.