Round Turn
A round turn is the complete cycle of opening and closing a futures or derivatives position—encompassing both the initial buy (or sell) transaction and the subsequent offsetting sell (or buy) transaction—used as the standard unit for calculating brokerage commissions, transaction costs, and trading volume in futures markets. Commission charges are typically assessed on a per-round-turn basis.
Key takeaways
- A round turn consists of two legs: the entry transaction (opening position) and the exit transaction (closing position).
- Futures commissions are most commonly quoted per round turn rather than per leg, varying from under $1 for electronic discount brokers to $25+ for full-service commodity brokers.
- Round turn volume statistics provide a measure of actual completed trading cycles, as opposed to single-leg or half-turn counts.
- High-frequency traders and scalpers execute thousands of round turns per day, making per-round-turn cost minimization a critical performance driver.
- The round turn concept applies equally to options (buy-to-open + sell-to-close or expire) and certain spot/forward FX transactions.
Explanation
The round turn is the fundamental unit of measurement for futures trading activity and cost. Because a futures position generates profit or loss only upon its complete exit (or at settlement), measuring trading in round turns rather than individual legs captures the true economic activity of completed speculative or hedging cycles. A trader who buys 10 E-mini S&P 500 futures contracts and later sells them has completed 10 round turns; the commission charge, usually quoted per round turn, is assessed once for the complete open-and-close cycle.
The historical origins of round turn pricing reflect the structure of futures commission merchants (FCMs) and full-service brokerage. In the pit-trading era, floor brokers negotiated directly with clients and charged a flat commission per round turn that included both legs of the transaction. This pricing structure persists in modern electronic markets, where commission schedules continue to be quoted per round turn despite the disaggregation of execution into independent electronic algorithms that execute each leg separately.
Round turn costs vary dramatically by market participant and instrument. Retail commodity traders working through discount online brokers might pay $1.50–$5.00 per round turn for CME Group equity index or agricultural futures. Institutional traders executing via prime brokerage arrangements negotiate much lower rates—often $0.10–$0.50 per round turn for high-volume clients—with volume-based tiering that further reduces costs as trading activity increases. For exchange-traded options, commissions are typically quoted per contract per leg (open) with exercise or expiration fees, rather than per round turn.
High-frequency trading firms and scalpers are acutely sensitive to round turn costs because their strategies generate extremely large numbers of round turns with small per-round-turn profit expectations. A scalping strategy that captures 1 tick ($12.50 per contract) on an E-mini S&P 500 future must cover a round turn commission of $1.50 (12% of gross profit) plus exchange fees and half the bid-ask spread. When total explicit and implicit costs approach or exceed expected revenue per round turn, the strategy is no longer viable—a fundamental constraint on high-frequency scalping that provides a natural floor to market liquidity costs.
In fund administration and performance reporting, round turn statistics are used to calculate portfolio turnover rates for futures-heavy portfolios (CTAs and managed futures funds). Regulator reporting requirements (CFTC Forms 1-FR-FCM and regulatory capital reporting) require FCMs to disclose round turn volumes as a measure of client trading activity. High round turn counts can also trigger pattern day trading rules in some jurisdictions or trigger scrutiny of trading practices under best execution regulations.
Formula
Total Round Turn Cost = Number of Round Turns × Commission per Round Turn
Example
A CTA (Commodity Trading Advisor) manages a $50 million managed futures portfolio and executes approximately 2,000 round turns per month across equity index, fixed income, and commodity futures. At an average commission rate of $2.00 per round turn (negotiated institutional rate), the monthly commission cost is 2,000 × $2.00 = $4,000, or $48,000 annually—approximately 0.096% of AUM, a modest but relevant cost. Adding exchange fees at $0.50 per round turn adds another $12,000 annually. For comparison, a retail trader executing the same strategy at $5.00 per round turn would pay $120,000 annually in commissions—a 250% cost premium that would materially reduce net returns. A scalper running 50,000 round turns monthly at $1.50 per round turn incurs $75,000 per month ($900,000 annually) in explicit commissions alone, requiring substantial gross returns to generate positive net P&L.
Related terms
Basis Best Execution Bid Ask Spread Block Trade Cover Equity Equity Index Exchange Floor Good This Week Order Hedging High Frequency Trading