Arbitrage Trading Strategies Explained

At a glance

Pure arbitrage: Simultaneous offsetting trades locking in a riskless profit
Availability to individuals: Essentially none in liquid markets
Practical variants: Cash-and-carry, merger, cross-venue crypto, funding rate
Real constraints: Speed, capital, fees, transfer time, counterparty risk

Key takeaways

Genuine riskless arbitrage in liquid markets is captured in microseconds by firms with colocated infrastructure. If you can see it on a screen, it is gone.
Most tradeable "arbitrage" is risk arbitrage: a highly probable convergence with a small chance of large loss.
Crypto cross-exchange spreads look large and are usually consumed by withdrawal times, transfer fees, and the capital needed to pre-position on both venues.
Merger arbitrage earns a spread for accepting deal-break risk, which is insurance-like and concentrated.
The honest question for any arbitrage is: what am I actually being paid to bear? If the answer is nothing, someone faster already took it.

What arbitrage means, strictly

Arbitrage in the strict sense means buying and selling equivalent exposures simultaneously at different prices, locking in a profit with no market risk. The classic textbook case is the same stock trading at different prices on two exchanges at the same instant.

In modern liquid markets these opportunities exist for microseconds and are captured by firms whose entire business is being faster. The practical consequence: any arbitrage visible to a human is either already gone, or is not actually riskless, and identifying which is the first analytical task.

Type	What is exploited	Real risk	Accessible to individuals?
Pure cross-venue	Same asset, two prices, same instant	Execution only	No, in liquid markets
Triangular FX	Inconsistent cross rates	Execution and latency	No
Cash-and-carry	Spot versus futures mispricing versus financing	Funding, margin, carry changes	Sometimes, with capital
ETF versus basket	ETF price versus net asset value	Execution, creation/redemption access	Rarely
Merger arbitrage	Spread between deal price and market price	Deal break, timing, regulatory	Yes, with concentrated risk
Crypto cross-exchange	Price gaps between venues	Transfer time, withdrawal limits, venue failure	Yes, with significant caveats
Funding rate / basis	Perpetual funding versus spot	Funding flips, liquidation, venue risk	Yes

A taxonomy, ordered from riskless to speculative.

Cash-and-carry: the most instructive example

A futures contract should trade at the spot price plus the cost of carrying the asset until expiry: financing cost, storage, minus any yield. When the futures price exceeds that fair value, you can buy the spot asset, sell the future, and deliver at expiry, capturing the difference.

Fair futures price = Spot x (1 + r x t) + storage - yield

  r  = financing rate for the period
  t  = time to expiry in years

If  Futures > Fair value:
     buy spot, sell futures, hold to expiry  ->  locked spread
If  Futures < Fair value:
     sell spot (or short), buy futures        ->  reverse carry

The profit is not free: it is compensation for tying up capital,
for funding risk if rates move, and for margin calls on the short
futures leg if the spot position cannot be posted as collateral.

The relationship and where the profit comes from.

This structure is heavily arbitraged in equity index and precious metals futures, where the spread is usually within a few basis points of fair value. It appears more often, and larger, in crypto, where financing markets are less efficient and where the annualised basis on futures has at times exceeded 20 percent. The apparent free money is compensation for venue risk, liquidation risk on the short leg, and the capital lockup.

Crypto arbitrage: why the spreads persist

Price differences of 0.5 to 2 percent between crypto venues are common and occasionally much larger. They persist for reasons that also explain why capturing them is harder than it appears.

Transfer latency. Moving an asset between venues takes minutes to hours. The spread you saw is unlikely to exist on arrival, so the only reliable method is holding inventory on both venues simultaneously, which doubles the capital and doubles the counterparty exposure.
Withdrawal limits and halts. Venues suspend withdrawals during exactly the volatile periods when spreads widen. This is the mechanism by which an arbitrage becomes an unhedged position.
Fee structure. Taker fees on both legs plus withdrawal fees frequently exceed the spread. Maker rebates change the arithmetic entirely.
Fiat rails. Moving currency between jurisdictions is slower and more expensive than moving crypto, which is why some persistent geographic premiums exist for extended periods.
Counterparty risk. Capital sitting on an exchange is an unsecured claim. The historical record of exchange failures makes this the dominant risk rather than a footnote.

Merger arbitrage: selling deal insurance

When company A agrees to acquire company B at 50 USD per share, B typically trades slightly below 50, say 48.60. Buying B captures 1.40 if the deal closes. The gap exists because deals sometimes fail: regulators block them, financing collapses, or shareholders reject them.

Element	Detail
Return source	Compensation for bearing deal-break risk and for capital tied up until closing
Typical spread	A few percent annualised over the expected closing period
Win rate	High: most announced deals close
Loss profile	On a break, the target often falls back toward its pre-announcement price, a loss many times the spread
Payoff shape	Insurance-like: steady small gains, rare large losses
Key analysis	Regulatory risk, financing certainty, shareholder approval, timeline, competing bids

The structural problem for individuals is concentration. A professional desk runs 30 to 50 deals so that one break is absorbed. With five positions, a single antitrust rejection can erase two years of spreads. If you cannot diversify across many simultaneous deals, the risk profile is materially worse than the headline numbers suggest.

How to evaluate any arbitrage claim

1
Name the risk you are being paid to bear
Funding, timing, counterparty, regulatory, or liquidity. If you cannot name it, you have missed it rather than avoided it.
2
Compute the all-in cost
Both legs’ spreads and commissions, transfer and withdrawal fees, financing on borrowed capital, and the opportunity cost of pre-positioned inventory.
3
Model the capital lockup
Annualise the return using the capital actually committed for the full period, not the notional spread. A 1 percent spread over three months on doubled capital is not a 4 percent annual return.
4
Stress the failure case
What happens if the transfer is delayed, the venue halts withdrawals, or the deal breaks? Size the position so this outcome is survivable.
5
Check who else is doing it and why they stopped
A persistent spread implies a barrier. Identify the barrier before assuming you have found an oversight.

Frequently asked questions

Can retail traders do arbitrage profitably?

Not pure arbitrage in liquid markets, where speed decides everything. Risk arbitrage variants are accessible: crypto basis and funding-rate trades, futures calendar spreads, and merger arbitrage in a diversified form. Each pays for a specific risk, and returns are modest relative to the capital and operational complexity required.

Why do crypto exchanges show different prices for the same coin?

Because they are separate order books connected only by traders moving capital, which takes time and costs money. Differences persist to the extent that transfers are slow, withdrawal limits bind, fiat rails are restricted, or counterparty risk makes holding balances on a venue unattractive. Each of those frictions is also what makes capturing the difference difficult.

Is the futures basis trade safe?

It is market neutral but not risk free. The short futures leg requires margin, and a sharp rally forces additional collateral even though the spot leg has gained in value. If the collateral cannot be moved fast enough, the position can be liquidated at the worst moment. That funding and liquidation risk is precisely what the basis pays for.

What return does merger arbitrage produce?

Historically a modest premium over cash, with occasional sharp losses when deals break, and returns that compress when many participants pursue the strategy. Its correlation with equities is low in normal times and rises during market stress, when deals are more likely to fail, which is the opposite of what a diversifying allocation should do.

What is triangular arbitrage?

Exploiting inconsistency between three currency pairs, for example converting EUR to USD to JPY and back to EUR for a net gain. Interbank markets price these consistently within microseconds, so in practice it is a latency business rather than an analytical one and is not accessible to retail participants.

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Educational use only. This guide explains how a strategy works. It is not investment advice, not a recommendation, and no result described here is a forecast. Test any approach on historical and out-of-sample data, size positions conservatively, and never risk money you cannot afford to lose.