Order anticipation
Order anticipation is a strategy of detecting the presence of a large buyer or seller and trading ahead of that interest to profit from the price move it is expected to cause. The SEC distinguishes it from unlawful front-running, which involves breaching a duty to a client or misusing confidential order information.
Senzoukria · Glossary · Updated September 2026
How the SEC described it
In its 2010 concept release on equity market structure, the SEC gave as an example of order anticipation a proprietary firm that seeks to ascertain the existence of one or more large buyers or sellers and to buy or sell ahead of them, aiming to capture the price movement their trading causes. The firm may then trade with the large participant after the move, and may treat that participant's interest as a free option if price moves the other way. The release contrasts this with liquidity-seeking strategies, which look for large interest in order to trade with it rather than ahead of it.
Order anticipation versus front-running
The release is explicit that a firm or person that violates a duty to a large buyer or seller, or misappropriates their order information and uses it for its own trading, is in a different situation: that is front-running in the legal sense, and it is prohibited. Order anticipation, as the SEC described it, relies on inferring large interest from public information such as the tape and the book. The regulatory question the release raised was whether modern high-speed tools make it harmful at scale.
The clues it relies on
- A level that keeps refilling after executions, suggesting an iceberg or a patient passive order.
- Repeated child orders of similar size at a steady rhythm, suggesting an execution algorithm.
- Small immediate-or-cancel orders used to probe for size that is not displayed, which the SEC calls pinging.
- Persistent one-sided delta at a price that does not move.
A worked example
The bid at 4,990.00 displays 40 contracts. Over ten minutes it refills five times, 200 contracts trade there, and the displayed size stays at 40 while price holds. A reader infers a large buyer and bids at 4,990.25, one tick in front, planning to sell higher if the buyer keeps absorbing. The inference can be wrong: the refills can come from several participants, the buyer can finish or withdraw, and if the level then breaks, the order placed in front of it is the first to be filled on the way down.
In Senzoukria
The heatmap's Iceberg rings and the Liquidity lens's refill candidates show levels that keep refilling, the trades tape on the Trading page shows repeated prints with the number of merged trades, and indicators such as Trade Size Distribution and Delta per Trade measure how concentrated a bar's flow was. The application reads public market data only; it has no access to other participants' orders, and none of its displays identifies who is behind a level.
Related
In the same section
- Order block
- Options trade side
- Order book
- Options sweep
- Book resiliency
- Options on futures
- Order book snapshot
- Options flow
Sources
This page in other languages
Frequently asked questions
- Is order anticipation the same as front-running?
- No. In the SEC's description, order anticipation infers large interest from market activity and trades ahead of it. Front-running in the prohibited sense involves violating a duty to a client or misusing confidential information about their orders. The first is a trading strategy whose effects regulators have questioned; the second is misconduct.
- Is reading icebergs and refills a form of order anticipation?
- The analysis itself is observation of public data. Trading ahead of the inferred interest is what the SEC called order anticipation. For an individual trader, the practical issue is less regulatory than statistical: the inference is often wrong, and the level that looked defended can be abandoned at any moment.