Sector rotation is the movement of investment capital from one group of industries to another as investors reassess growth, interest rates and risk. Tracking it shows which parts of the market are leading and which are lagging beneath the headline index.
How it works
US stocks are commonly grouped into the 11 sectors of the Global Industry Classification Standard (GICS): information technology, health care, financials, consumer discretionary, communication services, industrials, consumer staples, energy, utilities, real estate and materials. Each has widely traded sector ETFs, such as the Select Sector SPDR funds (XLK for technology, XLF for financials, XLE for energy and so on), which make the groups easy to compare.
Money moves between sectors for identifiable reasons:
- Interest rates: rising yields tend to weigh on long-duration growth stocks and on rate-sensitive utilities and real estate, while they can support bank lending margins.
- The economic cycle: cyclical sectors depend on demand growth; defensive sectors sell products people buy in any economy.
- Commodity prices: oil drives energy earnings; metals drive materials.
- Earnings revisions and themes: a wave of upgrades or a new theme can pull capital into one group, sometimes into one industry within a sector, such as semiconductors within technology.
The textbook business-cycle model links each phase to a typical leader: financials, consumer discretionary and industrials in an early recovery; technology in mid-cycle; energy and materials late in the cycle; consumer staples, utilities and health care in a contraction. It is a useful framework, but real markets follow it loosely and often anticipate the economy by months.
How to read it
- Relative strength: divide a sector ETF's price by SPY's. A rising ratio means the sector is outperforming the market, regardless of whether both are rising or falling.
- Several time frames: compare one week, one month and three months. A sector that leads on the short window but still lags on the long one may be at the start of a rotation, or in a short-lived bounce.
- Offensive versus defensive: ratios such as consumer discretionary to consumer staples (XLY ÷ XLP) serve as a gauge of risk appetite. A falling ratio with a rising index suggests investors are buying the market defensively.
- Participation within the sector: check whether most stocks in a sector are rising or only its largest member; see market breadth.
Worked example (illustrative numbers)
| ETF | 1-month return | vs SPY | 3-month vs SPY |
|---|---|---|---|
| SPY (market) | +2% | — | — |
| XLK (technology) | +6% | +4 pts | −2 pts |
| XLE (energy) | −3% | −5 pts | +6 pts |
| XLU (utilities) | +1% | −1 pt | +1 pt |
Over three months, energy led and technology lagged. Over the last month, the order reversed: technology outperformed SPY by 4 points while energy fell 5 points behind. That pattern describes money rotating out of energy into technology. If XLY ÷ XLP is also rising, the rotation is toward risk; if utilities and staples were the ones gaining, it would point the other way. Neither reading forecasts the next month; it describes where leadership currently sits.
Limitations and common mistakes
- Hindsight. Rotations are obvious on a chart afterwards; in real time, many apparent rotations are noise that reverses within days.
- Concentration. Sector ETFs are cap-weighted, and some are dominated by a few companies, so a sector's move may really be two or three stocks.
- Classification changes. GICS is revised from time to time. In 2018, for example, the communication services sector was created and several large internet companies moved out of technology, which changed both sectors' history.
- Forcing the cycle model. Assigning today's market to a cycle phase and buying the "right" sectors ignores that markets price expectations, not current data.
- Chasing last month's leader. Leadership can persist, but buying a sector after a large run without a plan for risk turns a rotation idea into a momentum bet.
In Clear Tape
The sector heatmap on the Today page is available on the Free plan: for the S&P 500 or the Nasdaq-100, each block is a stock, sized by market value, colored by the day's change and grouped by sector. Tools and Pro members also see the average change by sector on the market breadth card. Pro members get Clear Tape's sector map, posted before every open to mark the sectors showing strength, with the sector leading the latest map named in the morning brief, and the capital rotation and sector sections of the daily pre-market analysis. See pricing for what each plan includes.
For educational purposes only. Not investment advice.