What it means
Ordinary cash-and-carry buys an asset now and sells futures against it. The reverse structure sells the asset short now and buys futures, so it replaces the need to finance owned inventory with the need to obtain and maintain an asset borrow.
A University of Northern Iowa teaching note describes selling the underlying security short, taking the proceeds and going long its futures, with a simplified completion in which futures delivery obtains the asset and returns the borrowed shares. The short seller owes the borrowed asset back, not merely its opening cash value, and the long futures is intended to offset that future asset obligation.
Contract size, asset identity and settlement timing must align before treating the two legs as a matched position. Some futures are cash settled rather than physically delivered, in which case the trader must still obtain the asset to close the short, because cash settlement can offset price exposure without automatically solving the obligation to return borrowed securities.
Asset borrowing is a key constraint, since suitable securities may be scarce, fees can rise and the lender may require their return. The proceeds of the short sale are not necessarily freely available cash, because a broker can hold them as collateral and impose additional margin.
Dividends or other distributions can create payments owed to the asset lender, so include those cash flows alongside borrow fees and any interest received or paid. An apparent spread measured only from the two opening prices can disappear after these adjustments.
Margin calls create another timing problem, because the futures leg and the short asset leg can require cash or collateral before the intended settlement date. A hedge of final prices does not guarantee that the trader can fund every intervening demand.
Use executable prices observed at the same time, since bid-ask spreads, commissions and uneven fills can change the starting gap. The comparison depends on asset borrowing, distributions, contract terms and other costs, not simply on observing futures below spot.
For a manager reviewing the strategy, ask how the asset will be borrowed, how both legs settle and what happens if the borrow ends early. Stress the costs and liquidity before describing the trade as market-neutral.
In practice
Real-world examples.
Example
A fictional asset can be sold short at 104 while a matching deliverable futures contract can be bought at 100. If all relevant net costs are 2 per unit, the simplified spread is 2. Higher actual costs can remove it.
Example
A lender recalls the securities before futures settlement. The desk must replace the borrow or close the short early, potentially changing the realised spread.
Example
A broker retains short-sale proceeds as collateral. A trader's model had assumed those funds could earn outside interest. The revised model removes the unavailable income and shows the quoted gap is too small.
Formula
Calculation
Simplified net spread per unit = spot short-sale proceeds - futures acquisition price - net borrowing, distribution, funding and transaction costs. Include usable interest income only when the arrangement actually permits it.
For fictional prices, 104 -100 -2 =2 per unit. Across 1,000 matched units, that is 2,000 before any omitted costs.
If an unexpected extra borrow charge is 3 per unit, total net costs become 5. The result is 104 -100 -5 =-1 per unit, or a 1,000 loss.
These calculations assume matching settlement and complete costs. They do not measure return on required capital or establish that the trade can be executed.Case study
Seen in the real world.
Fictional case study: Elm Basis Trading spots a futures discount and plans a reverse cash-and-carry position. An analyst initially calls the opening gap riskless. Operations finds that the quoted borrow is short term while the futures settles later. The broker also requires additional collateral, and the contract uses cash settlement rather than delivering the borrowed shares.
The desk models an early recall and the cash needed to buy back the securities. The revised opportunity is unattractive, so it does not trade. The review separates a visible price difference from an executable, fundable settlement plan.
Watch out
Common mistakes.
- Treating every futures discount as an arbitrage opportunity. Borrowing terms and complete cash flows determine the relevant comparison.
- Assuming short-sale proceeds are unrestricted investment funds. Check collateral and account arrangements before including interest income.
- Ignoring asset recall or settlement mismatch. A long futures position does not automatically return the required borrowed asset.
Questions
People also ask.
Is this the same as ordinary cash-and-carry?
No. Ordinary cash-and-carry buys the spot asset and sells futures. The reverse sells the asset short and buys futures, creating different borrowing obligations.
Is it risk-free?
No. Directional exposure can be reduced while borrowing, funding, margin and execution risks remain.
Can cash-settled futures be used?
Potentially, but settlement does not deliver the borrowed asset. The desk must plan how to obtain and return it and assess the remaining basis and execution risks.
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