Hedging: delta, portfolio and tail hedges
Hedging means taking a position that offsets a risk you already have. It isn't about making money. It's about controlling how much you can lose, at a price.
Delta hedging
An options market maker who sells a call is short delta: it loses if the stock rises. To neutralise that, it buys shares equal to the option's delta. As the stock moves, delta changes (gamma), so the hedge is adjusted again and again. This continuous rebalancing is what turns options positioning into real buying and selling in the market.
Portfolio hedges
- Index futures: a manager who is long a portfolio of UK stocks can sell FTSE 100 futures to cut market exposure quickly, keeping the stock picks while removing the market move.
- Protective puts: buying puts sets a floor on losses. Clean and simple, but the premium is a cost every year, like insurance.
- Collars: buy a put and sell a call to pay for it. Cheaper protection, but you give up upside beyond the call strike.
- Pairs and sector hedges: long one company, short a close competitor, to isolate the company-specific view.
Tail hedges
Tail hedges protect against rare, extreme events: deep out-of-the-money puts, long volatility positions, or assets that rally in a crisis. They lose a little most of the time and pay off hugely in a crash. Some funds specialise in this, and their payoffs in March 2020 were enormous. The hard part is holding them through long quiet periods when they look like wasted money.
Beta and correlation
Hedge ratios depend on how closely your position moves with the hedge. A tech-heavy portfolio hedged with FTSE 100 futures will be poorly hedged, because the two don't move together. Correlations also change in crises, usually rising towards one as everything sells off together, which can help or wreck a hedge depending on how it was built.
The cost of hedging
Every hedge costs something: premium, carry, given-up upside, or basis risk (the hedge not matching the risk perfectly). Over-hedging can be as damaging to long-term returns as being unhedged. The question is always what you are protecting against, and what that protection is worth to you.
Key takeaway
Good hedging is precise: know the exact risk, pick the instrument that offsets it, and accept the cost knowingly. Hedges that are vague, too cheap or untested tend to fail in exactly the moment they were meant for.
Educational content only, not financial advice. Options involve significant risk and are not suitable for everyone.