What Is a Sector ETF? The 11 SPDR Funds and 27 Years of Sector Returns

Michael Whitman · Trading since 2017, full-time since 2020 · YouTube creator, 137K subscribers · Published 2026-09-06 · Updated 2026-11-02 · Reviewed 2026-11-01

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A sector ETF is a fund that holds one industry group, such as technology or energy, instead of the whole market. Two facts from the nine oldest SPDR sector funds frame everything below.

Over a full calendar year they spread far apart. In 2022 energy (XLE) returned 64.32% while consumer discretionary (XLY) lost 36.27%. On a single bad day they huddle. On the 302 days since December 1998 when the S&P 500 fund SPY fell more than 2%, all nine fell with it on 226, or 74.83%.

How it works

A sector fund holds one industry group. The standard classification, the Global Industry Classification Standard (GICS) kept by MSCI and S&P Dow Jones Indices, splits the market into eleven sectors, and State Street’s Select Sector SPDRs carry one fund for each: materials (XLB), communication services (XLC), energy (XLE), financials (XLF), industrials (XLI), technology (XLK), consumer staples (XLP), real estate (XLRE), utilities (XLU), health care (XLV) and consumer discretionary (XLY).

Buying one is a decision about that industry. A broad index fund deliberately expresses no opinion; choosing a sector is choosing to hold more of something than the market does, which is an active position whatever the wrapper.

Each one is concentrated by construction. Companies in the same industry face the same regulation, the same input costs and the same demand cycle, so they move together far more than a random selection would.

The overlap problem

A broad market fund contains all eleven sectors already. Weighted by size, so the largest sector is already the largest holding before anything is added.

Here is how large. In State Street’s holdings files for 23 October 2026, the 75 stocks in XLK made up 37.87% of SPY. A portfolio of SPY plus XLK is not a market fund with a technology tilt added on top of a neutral base; more than a third of the base was technology already.

Some sector funds are a handful of companies. In the same files, three stocks made up 49.56% of XLE (Exxon Mobil, Chevron, ConocoPhillips), 45.70% of XLY (Amazon, Tesla, Home Depot), 43.48% of XLC (Meta and Alphabet’s two share classes) and 42.00% of XLK (Nvidia, Apple, Microsoft). The least concentrated, industrials, still had 16.60% in three names.

Check the broad fund’s sector weights before adding anything. The answer is usually that you already own plenty.

A worked example

Take a hypothetical $10,000 split $9,000 in SPY and $1,000 in XLK, using the 23 October 2026 weights. The SPY part holds about $3,409 of XLK’s stocks (37.87% of $9,000), so with the added $1,000 the portfolio has about $4,409 in those stocks: 44.09% of the account, against 37.87% in SPY alone.

The $1,000 bought a tilt of about six percentage points, not a new holding. Whether that is the intent is the useful question to answer before buying.

Now the size of the bet, with a real year. Put $10,000 into each of three funds at the last close of 2021 and hold to the last close of 2022, dividends reinvested. SPY ended at about $8,182 (-18.18%). XLE ended at about $16,432 (+64.32%). XLY ended at about $6,373 (-36.27%).

The two sector funds finished $10,059 apart on the same starting sum, in the same twelve months, on the same exchange. That gap is what a sector choice puts at stake, in either direction.

Rotating between sectors pays twice. Selling one fund and buying another means crossing two spreads, and most people count only the fund they are moving into. If each leg costs 0.2% of a $10,000 position, one rotation costs $40, and four a year cost $160 before either sector has moved.

In practice

Fees depend on the fund, so check them rather than assuming. The Select Sector SPDRs list a gross expense ratio of 0.08%, below SPY’s 0.0945% (State Street fund pages, read 27 October 2026); narrower sector and theme funds from other issuers can charge far more.

Thin volume widens the spread. A small niche fund can cost more to deal in than its headline fee suggests, which matters most to exactly the people trading it actively.

One announcement can move the whole holding. A regulatory decision or a commodity price shift produces a gap across every constituent at once, which is the correlation working against you.

A stop exits an entire thesis. That is either exactly what you want or a disproportionate response to one bad week, and deciding which before entering is the useful step.

The legitimate uses

There are two, and both are specific. Filling a genuine gap, such as a broad fund with almost no exposure to something you want to own, and expressing a considered view you can state in a sentence and would defend for years.

Everything else is usually recency. A sector that has done well attracts money after it has done well. Write the thesis down with a time horizon before buying, and if it reads as “this has been going up”, a broad fund already owns it. Whether last year’s leader leads again is measured on the sector rotation page.

Sector classification is less settled than it looks. The standard systems assign each company to exactly one group, and large companies increasingly do several things at once. A retailer that runs one of the world’s largest computing businesses sits in one bucket, and the classification decides which sector fund holds it. Check which sector your largest holdings are actually assigned to.

The original data

Do the sectors really spread risk on a bad day? We took Yahoo Finance adjusted closes (dividends included) for SPY and the nine sector funds that have traded since December 1998, and counted, on every day all ten traded, how many of the nine fell. That is 7,002 days from 23 December 1998 to 26 October 2026. Days are grouped by SPY’s own move.

The bigger SPY’s fall, the more often every sector went with it. On a quiet down day all nine fell together about one time in ten; on the 302 days SPY lost more than 2%, 226 times. The defensive sectors gave little shelter on those days: utilities fell on 268 of the 302 (88.74%) and consumer staples on 273 (90.40%). The count is of direction only, not of size, and a fall counts when the return is below zero.

It cuts both ways. On the 242 days SPY gained 2% or more, all nine rose on 173 (71.49%). And it is not a law: on 4 April 2025 SPY fell 5.85% and all nine fell, utilities by 5.56%, while on 5 June 2026 SPY fell 2.58% and only five did, with utilities up 0.93% and staples up 1.71%.

Checked against Nasdaq. On the 2,510 days from 27 October 2016 that both sources cover, Nasdaq’s closes (prices only) and Yahoo’s closes before the dividend adjustment find the same 87 days with SPY down more than 2%, and all nine funds fell on 62 of them in both. Nasdaq’s 17 April 2026 volume of 9,999,999 and its stale 20 April 2026 row (no volume, every price equal to the previous close) were left out. Every count is in the data file, and the holdings figures are in the holdings table.

Attention runs the other way. Of the 24,971 trading and investing videos in this site’s corpus, 9 have the word “sector” or “sectors” in the title, most of them about industries such as banking rather than funds, at a median of 2,075 views, against 132 for “index fund” at a median of 69,951.

How far apart the sectors finish in a year

Daily direction is one test; the full-year result is another. For each calendar year from 1999 to 2025 we took every fund’s last adjusted close of the year against the last close of the year before, so dividends are included. That gives 27 years for each of the nine funds and SPY.

The spread between first and last was a median 36.08 percentage points. It was at least 20 points in 26 of the 27 years and at least 30 points in 20. The narrowest year was 2006, when utilities led at 20.89% and health care trailed at 7.05%; the widest was 2022, at 100.60 points.

First place moved around. Technology (XLK) led in 8 years and energy in 6, while energy also finished last in 6. Seven of the nine funds were the best in at least one year and the worst in at least one other; only materials (XLB) never led and only industrials (XLI) never trailed.

XLK itself went from first in 1999 (+65.14%) to last in 2000 (-41.88%).

Recent years were narrow at the top. In each of 2023, 2024 and 2025, only two of the nine funds beat SPY, which also holds the communication services and real estate sectors these nine leave out.

A sector fund puts you on one point along each year’s line; a broad fund holds every point at once. The yearly figures are in the returns file.

When it fails

In a range rotation produces costs and nothing else. Sectors take turns leading by small amounts, each switch pays two spreads, and the portfolio ends the period behind a fund that did nothing.

The second failure is buying after the run. Sector performance figures are published annually and money follows them, which means most buyers arrive late by construction.

A third is holding several sectors for safety. On SPY’s worst days they mostly fell together, so a mix of sector funds spread less risk than its labels suggest.

A fourth is stacking sector funds until they recreate the index. Five sector funds is a broad fund built the hard way.

And a fifth is ignoring the concentration inside. Two companies, Amazon and Tesla, were 40.28% of XLY.

Questions people ask

What are the 11 sector ETFs?

The Select Sector SPDRs are the best-known set: XLB (materials), XLC (communication services), XLE (energy), XLF (financials), XLI (industrials), XLK (technology), XLP (consumer staples), XLRE (real estate), XLU (utilities), XLV (health care) and XLY (consumer discretionary).

Are sector ETFs good for diversification?

Not on their own. Each holds one industry, and the nine oldest SPDR sector funds all fell together on 74.83% of the days since December 1998 when SPY lost more than 2%.

Which sector ETF is the most concentrated?

On State Street’s 23 October 2026 files, XLE: its three largest holdings were 49.56% of the fund. XLY was next at 45.70%, then XLC at 43.48% and XLK at 42.00%. XLI was the least, at 16.60%.

Are sector ETFs worth it?

That depends on whether you have a view you can state and hold. The cost of being wrong is large: from 1999 to 2025 the best and worst of the nine oldest SPDR sector funds finished a median 36.08 percentage points apart each year, and in 2022 the gap was 100.60 points. A broad fund avoids that choice entirely.

Do I need a sector ETF if I own an S&P 500 fund?

Only for a deliberate tilt. SPY already held every sector, including 37.87% in the stocks XLK holds, so a technology fund added on top increases a position you already have.

Related

ETF investing covers the wrapper and its costs. Index funds is the broad alternative that already holds every sector. And portfolio building is where overlap gets checked.

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