Hedging Sector Exposure with ETF Puts
Reviewed by Leon Moyer - Published October 9, 2026 - Last reviewed October 9, 2026
In this lesson
Size a sector ETF put hedge with sector beta and explain the basis risk it leaves behind.
Hedging sector exposure means buying protection, usually puts on a sector ETF, so that a sharp fall across one industry does less damage to a portfolio concentrated in that industry. One position on the fund covers a fall in the whole group, at a known cost, without selling the stocks you own.
This lesson uses ABC, a hypothetical sector ETF of chipmakers trading at $100, and a hypothetical portfolio of $50,000 spread across five chip stocks.
Why hedge a sector instead of each stock?
If most of your money sits in one industry, your biggest risk is often the industry itself: a demand slump, a regulation change or a rate shock that hits every company at once. A sector ETF put targets exactly that risk.
Compared with buying a put on every stock you own, an ETF hedge is:
- Cheaper, because a diversified fund has lower implied volatility (the market's estimate of future swings) than most of its holdings, as Sector ETF Options showed.
- Simpler, with one position to open, track and roll instead of five.
- Less precise, because it protects against the sector's move, not each company's. More on that gap below.
What is sector beta, and how does it set the hedge size?
Sector beta measures how much your portfolio tends to move when the sector fund moves. It is the same idea as the beta your broker may show, but measured against the fund you hedge with rather than a broad market index. A chip portfolio might have a beta near 1.0 to a broad index and 1.2 to ABC, and only the second number tells you how many ABC puts you need.
Start with dollars. One put contract covers 100 shares of the fund, so:
Contracts = dollars to hedge x sector beta / (ETF price x 100).
How sector beta changes the size of an ABC put hedge
Dollars to hedge = $50,000 x sector beta
With a beta of 1.0, the $50,000 portfolio against ABC at $100 needs $50,000 / $10,000 = 5 contracts. A portfolio with a beta of 1.2 to ABC tends to move 12% when ABC moves 10%, so it would need $50,000 x 1.2 / $10,000 = 6 contracts to be fully hedged.
To estimate sector beta, compare your portfolio's past daily or weekly percentage moves with ABC's over the same months. Many charting tools and spreadsheets can fit that ratio. Two cautions: beta comes from past prices and drifts, and a beta number says nothing about how closely the two move together day to day. A portfolio can have a beta of 1.0 to ABC and still wander far from it.
Sizing a hedge for a whole, diversified portfolio against a broad index, and choosing its strike and expiration, are covered in How to Hedge a Portfolio With Index Puts in the Advanced Risk and Tail Hedging module. This lesson stays with the sector-specific part: the fund, its beta and the gaps.
What does a sector put hedge cost, and what is its maximum loss?
Worked example
Five ABC 95 puts on a $50,000 chip portfolio
New setup: ABC trades at $100, at 22% implied volatility. Assuming a sector beta of 1.0, you buy 5 ABC 95 puts expiring in 60 days for $1.33 each, a model price from the same engine the OptionsPro calculator uses.
- Cost: 5 x $1.33 x 100 = $665, about 1.3% of the portfolio for two months.
- Maximum loss: $3,165, if ABC finishes at or below $95: the first 5% of the fall ($2,500) plus the $665 cost.
- Maximum profit: unlimited, because the portfolio keeps all of its upside, less the $665 paid.
- Break-even: ABC at $101.33; the portfolio has to rise 1.33% just to cover the cost of the hedge.
These figures assume the portfolio moves exactly with ABC.
Illustrative and hypothetical. The ticker and prices are invented for teaching, and the figures exclude commissions, fees, margin interest and taxes, which reduce real results. Past or hypothetical outcomes do not indicate future results.
$50,000 of chip stocks hedged with five ABC 95 puts, at expiration
Hover or tap the chart, or focus it and use the arrow keys, to read any price.
Open this trade in the free calculatorShow as table
The shape matches the Options Industry Council's protective put guide: a floor below the strike and full upside above it, minus the premium. Below $95, every further dollar ABC falls costs the portfolio $500 and pays the puts $500. Without the hedge, a fall to $80 would cost $10,000; with it, the loss stops at $3,165, but only if the portfolio really does track ABC.
What is basis risk, and what does a sector hedge miss?
The hedge pays on ABC's move, not on your portfolio's. The gap between the two is called basis risk.
When the portfolio does not move with the ETF
Portfolio plus puts
Portfolio alone
At the puts' expiration, before fees:
- Your stocks track ABC. Both fall 10%: the portfolio loses $5,000, the puts pay $2,500 for a $1,835 gain after their cost, and the net loss is $3,165, as planned.
- Your stocks fall more. ABC falls 10% but your portfolio falls 15%, as if its sector beta were 1.5 rather than the 1.0 you sized for: the portfolio loses $7,500, the puts still gain only $1,835, and the net loss is $5,665.
- One stock falls on its own news. ABC is flat, but one $10,000 holding drops 60% after a company-specific shock: the portfolio loses $6,000, the puts expire worthless, and the net loss is $6,665, worse than with no hedge at all.
The second case is a beta problem: the hedge was too small for how the portfolio actually moved. The third is company-specific risk, which no sector hedge covers. Trading options around single-stock earnings is covered in Earnings and Event Strategies in the Advanced Strategies course.
How can you reduce basis risk in a sector hedge?
- Pick the fund that overlaps most. Compare the fund's top holdings and weights with yours. A fund that holds your names at similar weights tracks your portfolio more closely.
- Size with sector beta, and recheck it. Re-estimate beta every few months, or after you change the portfolio, and adjust the contract count.
- Hedge your biggest single names separately. If one stock is a large share of the portfolio, a put on that stock covers its own news, which the fund put cannot.
- Expect some gap anyway. Even a well-matched hedge leaves some loss uncovered. Treat the worked example's $3,165 as a best case, not a guarantee.
Hedges that sell options to pay for part of the protection, such as put spreads and collars, are covered in Put Spreads and Collars - Selling Options to Pay for a Portfolio Hedge, also in the Advanced Risk and Tail Hedging module.
Check your understanding
You want to hedge $80,000 of bank stocks with puts on a bank ETF trading at $40. Your portfolio's beta to that fund is 1.25. How many contracts do you need?
Show answer
$80,000 x 1.25 / ($40 x 100) = $100,000 / $4,000 = 25 contracts. With a beta of 1.0 it would be 20.
Five ABC 95 puts cost $1.33 each, on a $50,000 portfolio that tracks ABC at $100. What is the maximum loss, and why?
Show answer
$3,165: the $2,500 lost as ABC falls from $100 to $95 (5% of $50,000), plus the $665 paid for the puts. Below $95 the puts gain as fast as the portfolio loses.
ABC is flat, but one of your holdings falls sharply after a company-specific shock. Does the sector hedge help?
Show answer
No. The puts pay only if ABC falls below the strike. A loss caused by one company's own news is basis risk the sector hedge does not cover, and the put premium adds to the loss.
Key takeaways
- Sector ETF puts protect a concentrated portfolio against a fall in the whole industry, usually more cheaply than puts on each stock.
- Contracts = dollars to hedge x sector beta / (ETF price x 100), where sector beta is measured against the fund, not the broad market.
- In the example, five ABC 95 puts cost $665 and cap the loss at $3,165, with a $101.33 break-even, if the portfolio tracks ABC.
- Basis risk remains: if your stocks fall further than the fund, or one falls on its own news, the hedge covers less. Pick the closest fund and recheck beta.
Common questions
How do you hedge a sector with options?
The most direct way is to buy puts on an ETF that tracks the sector. If the sector falls below the put's strike, the puts gain value and offset part of the portfolio's loss. Size the hedge by the dollars you want to protect, not by the number of stocks you own.
What is sector beta?
Sector beta measures how much a portfolio or stock tends to move when a sector fund moves. A beta of 1.2 to a chip ETF means the holdings tend to move about 12% when the fund moves 10%. It is estimated from past prices and can drift.
Is it better to hedge with ETF puts or puts on each stock?
ETF puts are usually cheaper and simpler, with one trade instead of several. Puts on each stock protect against each company's own bad news, which a sector hedge does not, but they cost more in total.
What is basis risk in hedging?
Basis risk is the chance that the hedge and the thing you are hedging do not move together. A sector ETF put pays on the fund's move, so if your stocks fall further than the fund, or one stock falls on its own news, the hedge covers less than you expected.