Hedging
ES: Cobertura (Hedging) PT: Hedge / Cobertura
Reducing an unwanted exposure by taking on another that offsets it: which instruments exist, what they cost, and why permanent hedging almost always turns out expensive.
What hedging is and what it is not
Hedging is deliberately taking a second position whose behaviour offsets the first against a specific risk. It is not reducing position size — that is simply selling — nor is it betting against yourself hoping to win on both. A well-built hedge is designed to lose money in the favourable scenario: that is its cost, and it is exactly what you are buying. The most useful practical distinction is between hedging an identified, time-bounded risk — an earnings release, a macro print, a court decision — and trying to hedge general market risk indefinitely, which is what almost never works economically.
The instruments and what each costs
Four families, ordered from most to least expensive. The protective put is pure insurance: it keeps all upside and sets a floor, in exchange for a premium that in indices runs 1–2% monthly for near strikes — a cost that compounds prohibitively for a permanent position. The collar finances that put by selling a call above: it can cost close to nothing, but gives up the range beyond the sold strike. Selling index futures neutralises exposure precisely and cheaply, but symmetrically removes participation in rallies. And cross-asset hedges — bonds, gold, safe-haven currencies — cost little or even yield, but only work while the historical correlation holds, which is precisely what fails in crises.
The problem with permanent hedging
The arithmetic is unforgiving. Continuously buying protective puts on an equity portfolio historically costs between 2% and 4% of annual return, and in most periods that cost has comfortably exceeded what the protection contributed in the episodes where it worked. It is the logic of any insurance: the insurer wins on average, which is why the business exists. The conclusion is not that hedging is always bad, but that permanent hedging is a tax on returns and must be justified by something more than discomfort with volatility. If what you have too much of is risk tolerance, the cheapest solution is almost always reducing exposure: it costs no premium.
When hedging does pay
Four situations where hedging has a clear economic justification. First, an identified, bounded event: hedging four days around an earnings release costs a fraction of hedging the whole year. Second, a tax or contractual constraint: when selling would trigger a tax impact far exceeding the cost of the hedge, or when there is a commitment not to sell. Third, an excessive concentration that cannot be unwound at once, such as an inherited position or one tied to compensation. Fourth, a defined horizon: if you need that capital in nine months for a specific goal, protecting against a collapse has a value that does not show up in expected-return calculations.
The mistakes that ruin a hedge
Three, very common. Hedging after the scare: buying protection once the VIX has already spiked means paying the highest price for insurance exactly when the risk has already materialised; hedges are bought cheaply in calm, not expensively in panic. Sizing it wrong: buying one put on 100 shares when the portfolio is equivalent to 800 index deltas leaves 87% of the risk uncovered while paying full premium and generating a false sense of security. And using structurally eroding instruments, such as volatility ETPs, for long-term hedging: their contango makes them lose value systematically, and what looked like a cheap hedge turns out to be the most expensive vehicle of all.