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Key Takeaways
- A sweep seeks immediate execution across available liquidity, producing a rapid cluster of related fills.
- Fills can execute at one price across venues or reach additional price levels.
- Compare execution side, contract selection, and related legs to identify the trade structure.
- Sum child-fill premium to measure the complete execution’s dollar value.
- Pair sweep activity with open interest, the chart, and the payoff to build the setup.
What is a sweep order?
A sweep order is an order that seeks immediate execution by taking available liquidity across several exchanges at once, reaching additional price levels if the best price runs out of size. In options flow it appears as a rapid cluster of related fills, and the whole cluster measures the order’s size, premium, and execution price.
A buy sweep accesses offers; a sell sweep accesses bids. Fills can occur at the same price across several venues or reach additional price levels as available size is consumed. A marketable limit supplies the order’s price boundary.
Formula
Sweep premium = sum of each fill’s price × contracts × premium multiplier- Standard equity options use a 100 premium multiplier.
- Use every child fill or the contract-weighted average price.
- The exercise deliverable is a separate contract field and can change while the premium multiplier stays at 100.
How does a sweep order work?
A trader wants 1,000 XYZ calls immediately, but no single exchange displays that many at the best offer. A router sends the order to four venues at once, taking every contract available at or near the ask.
- Venue fills: 400 at $2.40, 300 at $2.45, 200 at $2.50, 100 at $2.55, for 1,000 contracts total
- Total premium: (400 × 2.40 + 300 × 2.45 + 200 × 2.50 + 100 × 2.55) × 100 = $245,000
- Blended price: $245,000 / (1,000 × 100) = $2.45 per share
The four executions total 1,000 contracts and $245,000 in premium, with a $2.45 weighted price. Compare that price with the initial $2.40 offer to measure the $5,000 additional execution cost in this example. Then inspect related activity and the chart to build the trade.
Against the initial $2.40 offer, the additional cost is $0.05 × 1,000 × 100 = $5,000. That calculation measures the execution cost of this sweep. The same-size sweep across venues displaying sufficient contracts at one price has no price step between fills.
Price the sweep with the contract’s premium multiplier; the exercise deliverable sets what an assignment delivers.
Sweep pattern versus formal ISO
Flow tools group executions by contract, timing, size, venue, price, and trade conditions. A sweep tag identifies the rapid execution pattern.
A formal Intermarket Sweep Order carries specific routing and marking requirements. The options linkage plan governs listed-options ISOs; equity order-protection rules govern stock ISOs. A sender using the ISO exception routes orders for the full displayed size of better-priced protected quotations while the destination executes its ISO. Keep that instruction separate from the grouped pattern in a flow scanner.
How do traders use sweeps?
Find urgency. Compare the sweep’s size and premium with the series’ typical activity and reported open interest.
Read execution side. Locate fills against the contemporaneous bid and ask, then inspect nearby strikes and expirations for related legs.
Build the structure. Identify the outright option, spread, roll, or hedge and calculate its combined exposure.
Confirm the setup. Bring the activity onto the chart, map the catalyst and decision levels, and model the payoff before setting entry and exit.
For the largest qualifying executions, Golden Sweeps add a premium threshold of $1 million and require size at least equal to reported open interest. Compare sweeps with blocks to distinguish rapid liquidity access from concentrated transactions.
Common sweep order mistakes
- Reading urgency as direction. A sell sweep hits bids just as a buy sweep lifts offers. Direction comes from the contract type, the execution side, and the combined position.
- Confusing the sweep tag with the ISO flag. The flow tool groups the burst; the formal Intermarket Sweep Order instruction is a separate routing flag. Read contract, time, trade conditions, side, and related legs together.
- Assuming every sweep opens a position. Sweeps open and close positions. The next open-interest report measures the change in outstanding contracts for the whole series, so compare it with the full session’s flow.
- Missing the second leg. Compare strikes, expirations, sizes, execution sides, and trade conditions for evidence of a spread, roll, or hedge, and read the combined exposure when the sweep is one leg of that package.
- Pricing the sweep at the first fill. The example pays $5,000 more than buying all 1,000 contracts at the initial $2.40 offer, so the weighted price, not the first fill, is the real entry.
Bottom line
In the example, the trader paid $5,000 over the first offer to fill 1,000 contracts at once, and that premium for speed makes a sweep the clearest sign of urgency on the tape. Measure the whole cluster’s size, premium, and weighted price, then read the side, open interest, and related legs to call the direction.
Clear answers
Frequently Asked Questions
Sources and Further Reading
- Cboe: EDGX Rulebook
- Cboe: Options routing strategies
- SEC: Guidance on Intermarket Sweep Orders
- InsiderFinance: Explaining the Order Flow
How entries are sourced, calculated and updated: editorial methodology.