Sector Rotation Strategy: How It Works, 26 Years of Results, and Where It Breaks

A sector rotation strategy moves money between market sectors, such as energy, technology and utilities, on a rule. The rule tries to hold the sectors likely to lead and step away from the ones likely to lag.

Most versions use one of two signals. Where the economy sits in its cycle, or which sectors have been rising fastest.

I run index strategies for a living, and the part that decides whether one of these works is almost never the signal. It is the clock and the cash rule, and both of those get skipped.

What is a sector rotation strategy?

The S&P 500 splits into 11 sectors under the GICS system. Real estate became its own sector in 2016. Communication services followed in 2018.

Those sectors do not move together. In 2022 the index lost 18.1 percent. Energy gained 65.7 percent the same year. Communication services lost 39.9 percent.

That spread is the opportunity sector rotation chases. You do not need to pick stocks. You need to pick the right slice of the market, and then leave it at the right time.

Sam Stovall’s 1995 book on sector investing made the idea popular with individual investors. The Select Sector SPDR funds arrived in December 1998 and made it cheap to run.

How does a sector rotation strategy work?

1. Define the universe. Usually the 11 GICS sectors, each held through one sector ETF. 2. Pick a signal. Either an economic read or a price read. More on both below. 3. Rank the sectors. Score each one on the signal, highest to lowest. 4. Hold the top of the list. Commonly the top two to four, in equal weights. 5. Rebalance on a schedule. Monthly is most common. Weekly and quarterly versions exist. 6. Decide what happens in a broad decline. Many rules stay fully invested. Some add a cash filter.

Step six gets skipped more than any other, and it matters most. A pure ranking always owns something. In a market where every sector falls, it owns the ones falling slowest.

What does a real sector rotation rule look like?

Katie Stockton, founder and managing partner of Fairlead Strategies, builds one of these for a living, and she walked through the construction on Behind the Ticker.

Her model starts from the same 11 sectors and drops three of them on purpose. Real estate, utilities and consumer staples come out, because in her research they "underperform enough" in a strong market to not add much. That leaves eight equal weighted buckets, each one 12.5 percent, filled with Select Sector SPDR funds.

A sector earns its bucket by clearing three tests, all of them long term: momentum, overbought and oversold readings, and relative strength against the broader market. In her words, "those qualifiers when they are met will fill the bucket with that sector". When they are not met, the bucket moves out of equities altogether, into long Treasuries, short Treasuries or gold.

That is the shape of a complete rule. A ranking, a threshold, and somewhere to go when nothing qualifies.

What are the two main types of sector rotation?

Business cycle rotation. This model maps sectors to economic phases. Early in a recovery, financials, industrials and consumer discretionary tend to lead. Mid cycle favors technology. Late cycle favors energy and materials. In a recession, investors crowd into consumer staples, utilities and health care.

John Davi, founder and chief investment officer of Astoria Advisors, uses that logic directly. Describing how he built an inflation sensitive portfolio, he called energy, materials, industrials and financials the "growth sensitive, business cycle sensitive sectors", and leaned on them because they respond to the growth cycle.

The logic is sound. The hard part is knowing which phase you are in while you are in it.

Momentum rotation. This model ignores the economy. It ranks sectors by trailing return, usually over three to twelve months, and buys the leaders. Mebane Faber’s 2010 paper on relative strength strategies is the version most people search for.

Momentum rotation is a rules based cousin of factor investing, and the same idea packaged as smart beta, and the bet is that recent leaders keep leading for a while.

How often should a sector rotation strategy rebalance?

Monthly is the default. The frequency changes the outcome more than most people expect.

Take one momentum rule on the nine original Select Sector SPDR funds, 2000 through 2025. Rank by trailing total return, hold the top three in equal weights. Change only the clock.

Faster earns a little more and trades three to six times as much. Those are fund total returns from adjusted closing prices, before any trading cost. The faster rules hand part of the extra return back in spreads, and in a taxable account they hand back more, because the gains are short term.

Jon Clements, who co-founded Market Desk Research and runs a momentum ETF there, lives at the fast end of that table. His fund ranks on six months of price data and rebalances monthly, which puts turnover at "about 60 to 70% turnover on a monthly basis". His sector exposure, he said, looks different every single month.

He chose six months over the academic standard of twelve for one reason. A twelve month window smooths noise, but it is "much slower to respond to market changes". Six is where he thinks the trend is still real and still fresh.

Stockton runs the other end of the same tradeoff. Her model reads month end closing data only, and she is explicit about why: shorter inputs "created more noise without adding value from a risk reward perspective". Changes happen near the first trading day of the month, and not in between.

Two practitioners, same mechanism, opposite answers on the clock. Neither is wrong. They are paying for different things.

Sector rotation strategy example: 2022 and 2023

Take the simplest momentum rule. At each year end, buy the three sectors with the best calendar year total return. Hold them in equal weights for twelve months.

Here is the 2022 basket. At the end of 2021 the leaders were energy, real estate and financials.

- Energy in 2022: up 65.7 percent

- Real estate in 2022: down 26.1 percent

- Financials in 2022: down 10.5 percent

- Basket average: up about 9.7 percent, against an S&P 500 loss of 18.1 percent

A great year for the rule. Now roll it forward.

Here is the 2023 basket. At the end of 2022 the leaders were energy, utilities and consumer staples.

- Energy in 2023: down 1.3 percent

- Utilities in 2023: down 7.1 percent

- Consumer staples in 2023: up 0.5 percent

- Basket average: down about 2.6 percent, against an S&P 500 gain of 26.3 percent

Technology returned 57.8 percent in 2023. The rule did not own it. The ranking still pointed at 2022’s defensive winners when the market turned.

Same rule, back to back. About 27 points ahead one year, about 29 points behind the next.

Does sector rotation actually work over a full cycle?

Over the 26 years from 2000 through 2025, the simple annual momentum rule returned 7.3 percent a year against the index’s 8.0 percent, finishing ahead of the index in 9 of those 26 years.

The rule was not a disaster. It also was not an edge. The spread matters more than the average, and that spread is wide: its strongest year was 2022, ahead by about 27 points, and its weakest was 2023, behind by about 29 points.

The defensive case needs the same scrutiny. The index fell in six of those 26 calendar years. The rule beat it in two of them, 2002 and 2022. In the other four it trailed by about 2 points on average. In 2008 itself it lost 37.3 percent while the index lost 36.8 percent.

One great year carries the whole defensive story.

What is the best sector rotation strategy?

There is not one. The signal that wins depends on the regime, and nobody knows the regime in advance. What you can judge is the construction. Three questions do most of the work.

1. How many sectors does it hold? Three concentrates hard. Six barely differs from the index. 2. How often does it rebalance, and what does the turnover cost? The table above sizes that. 3. Can it ever hold cash? This is the question that separates a relative bet from a risk rule.

James St. Aubin, chief investment officer of Ocean Park Asset Management, put the third question plainly. His portfolios can sit entirely in cash when every signal is negative, and he said the "optionality to go to cash" is what gives the process its advantage. He added that cash is not a target allocation for him, just where the money goes when nothing qualifies.

A monthly momentum rule with a cash filter is a different product from a business cycle rule reviewed each quarter. They share a label and little else. Compare the methodology, not the name.

When does a sector rotation strategy fail?

- Sharp leadership reversals. The 2023 example above. Momentum rules buy last year’s story at the moment it ends.

- Broad declines. In 2008 every sector fell. A fully invested rotation just picks which losses to take. That is a different problem from a bear market investment strategy.

- Narrow markets. When a handful of mega cap names drive the index, sector labels hide the real exposure. Those names sit across technology, communication services and consumer discretionary.

- Cost and tax drag. Monthly or weekly turnover in a taxable account eats a real share of any edge.

- Crowding. Popular rules trade the same sectors on the same dates, which moves prices against everyone using them.

The second point is the big one for advisers. Sector rotation is a relative bet. It seeks to beat the market rather than to step out of it, which is a different job from risk management.

THOR’s index rotation approach rotates among three broad equity indexes, not sectors, and it can move to cash when the signals turn off. Our explainer on the THOR SDQ Rotation Index walks through that rule. Other rules shift between whole assets instead. See tactical asset allocation, trend following ETFs and managed futures ETFs. For the rules that size risk rather than pick a winner, see volatility targeting and low volatility ETFs. On who makes the call, see systematic investing versus discretionary. On the concentration underneath any sector weight, see equal weight versus cap weight.

Definitions

- Sector rotation. Moving money between market sectors on a rule, to hold expected leaders and avoid expected laggards.

- GICS. The Global Industry Classification Standard. It splits the S&P 500 into 11 sectors.

- Business cycle rotation. Choosing sectors by the phase of the economy: early, mid, late or recession.

- Momentum rotation. Choosing sectors by trailing return, usually over three to twelve months.

- Relative strength. A sector’s return compared with the index or with other sectors over the same window.

- Cash filter. A rule that moves some or all of the portfolio to cash when a broad signal turns negative.

- Lookback window. The trailing period a momentum rule measures, commonly three, six or twelve months.

- Turnover. How much of the portfolio trades in a year. 100 percent means the whole book changed hands once.

Talk it through

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This is educational content and not investment advice. It is not a recommendation regarding any security. Index and fund figures cited above are public market data and a hypothetical illustration before costs and taxes. They do not represent the performance of any THOR fund or strategy. Fund managers quoted are describing their own approaches. Investing involves risk, including possible loss of principal. Past performance does not guarantee future results.