A falling UK market does not have to mean sitting still. If most of your capital sits in long-only funds and FTSE constituents, a downturn leaves you one lever: sell, and hope you get back in at the right time. Hedging gives you a second lever. Using margin, you can take offsetting positions so losses in one place are partly cancelled by gains in another. It is not free and it is not a trick. Done badly, it turns a bad quarter into a very expensive one.
What a Hedge Is Actually For
Start with the honest version. A hedge does not make you money in a falling market; it makes you less exposed to one. The test is simple: what exactly are you insuring, and what are you willing to pay for that protection?
If your portfolio is heavy in UK banks, housebuilders and domestically focused mid-caps, a broad index short is a blunt but usable cover. If your risk is really a weak pound hitting importers, or falling gilt yields lifting your long-duration growth names, an index short may hedge almost nothing. Match the tool to the exposure, not to the headline.
Margin enters the picture because most hedges require less capital than the position they offset. That leverage is the appeal and the danger. A hedge that removes all of your downside also removes most of your upside and adds financing costs on top. Most sensible investors hedge part of the risk, not all of it.
Short Positions: The Most Direct Route
Spread bets and CFDs
For UK retail accounts, contracts for difference and spread bets remain the standard way to take a short. You sell an instrument tracking the FTSE 100, a sector or a single share, and profit if it falls. Margin is a fraction of the notional value, financing is charged daily, and losses on a short are theoretically unlimited because a share price can rise without a ceiling.
That last point matters. A short hedge needs a stop-loss before you open it, not after. Decide the level at which you admit the thesis is wrong and close the position, then size it so that stop costs you an amount you can absorb.
Short selling shares on margin
Your broker can also borrow stock for you to sell, with the aim of buying it back cheaper. This is cleaner in one sense — you own a real short position in a real company — but it comes with borrow fees that vary with demand, dividends you must pay the lender while you are short, and the occasional risk of a buy-in if the shares become hard to borrow. For most private investors hedging a portfolio, an index or sector short is simpler and cheaper to manage.
Inverse ETPs: Convenient, With Conditions
Inverse exchange-traded products rise when their underlying index falls. They trade like shares, need no margin account in the strict sense and carry no borrow fee. The catch is the reset. Most inverse products rebalance daily, which means a product delivering minus one times the daily move will not deliver minus one times the move over a month. In choppy markets, that compounding works against you even if the index ends lower.
Most inverse products available to UK retail investors are European-domiciled ETPs; US-listed equivalents are generally off-limits because they do not carry the required key information document. Before buying, check:
- Whether the reset is daily, weekly or monthly, and whether that matches your holding period
- The leverage factor — two or three times daily moves decay faster and cut both ways
- Ongoing charges, plus the swap or derivative counterparty behind the product
- The bid-offer spread and daily trading volume, especially for niche sector products
- Currency exposure, since many are denominated in euros or dollars
- Whether the structure is a fund or a note, because your claim differs if the issuer fails
Treat these as short-term tools measured in days or weeks, not as a six-month insurance policy.
Options: Paying for Asymmetry
Options give you the cleanest hedge, because you can define the cost in advance. A protective put on the FTSE 100 or on a large holding sets a floor under your losses for a known premium. When you buy an option you pay in full, so there is no margin call on that leg — the risk is limited to what you spent.
A collar takes this further. You buy a put and sell a call against the same underlying, which often finances most or all of the protection. The trade-off is capped upside above the call strike: you have bought a floor and sold your ceiling.
Selling options to fund a hedge is a different animal. Writing puts or calls puts you on margin, with losses that can run well past the premium you collected. Time decay, expiry dates and strike selection all matter, and spreads on less liquid UK names can be wide. If you are new to listed derivatives, learn with the smallest size your broker allows before hedging anything real.
Costs, Margin Calls and Over-Hedging
Hedging is a drag on returns, and the drag is easy to underestimate. Broker financing on leveraged positions typically runs above the base rate. Spreads and commissions add up on every roll. Short positions can require dividend adjustments. And if your hedge does not track your holdings closely — say you short the FTSE 100 while holding mid-cap industrials — you are left with basis risk: the gap between what you own and what you have hedged.
Margin calls are the other trap. In a sharp fall, your long portfolio loses value and your available equity shrinks at the same moment your broker wants more collateral for the hedge. Gains on a short may not be immediately withdrawable. Keep cash aside for that, or you may be forced to close the hedge at the worst possible moment.
A Workable Process
- Write down your net long exposure by sector, size and currency. You cannot hedge what you have not measured.
- Decide how much downside to remove. Many investors hedge 25 to 50 per cent of a portfolio rather than the whole thing.
- Pick the cheapest tool that matches the exposure. Broad market risk suits an index short or index put; single-stock risk suits a put on that share.
- Size by risk, not by conviction. Work out what the position costs if your stop is hit, then check it against your total capital.
- Check the margin requirement and hold a cash buffer above it.
- Plan the exit before you open the trade — a date, an index level, or a fall in the cost of protection — and write it down.
Getting Started Without Getting Caught Out
Keep it simple to begin with. A single index-level hedge, sized modestly and reviewed weekly, teaches you more than a dozen overlapping positions. Watch the financing charge on your statement, because it quietly tells you what the hedge really costs to hold. Review each position monthly and close the ones whose reason for existing has gone; a hedge left running out of habit is just an expensive second portfolio.
Tax treatment differs between spread bets, CFDs, options and ETPs, and depends on your circumstances and how you trade, so take professional advice before assuming any position is tax-efficient. And remember the basic discipline of margin: leverage magnifies whatever you get wrong, including your hedging.
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