What sector rotation tells you — and what it doesn’t
Ranking the 11 sectors by relative strength shows where money is moving. Here is how to read the ranks, the shifts and the traps.
5 min read · updated October 29, 2026
The S&P 500 is eleven sectors stacked on top of each other. On most days they don’t move together: some lead, some lag, and the order changes over weeks. Sector rotation is the study of that order — which groups money is moving into, and which it is leaving.
How the ranking works
Each sector ETF (XLK for technology, XLF for financials, XLE for energy and so on) is scored on its return relative to the S&P 500 over several windows — a week, a month, three and six months. The blend gives a rank from 1 (strongest) to 11 (weakest).
A single day’s move says little. What matters is the rank changing over time: a sector climbing from 9th to 4th over two weeks is being bought, whatever the index did.
What to look for
- A sector entering the top three: new leadership, often early in a move.
- A leader falling out of the top three: the move may be tiring, or money is rotating elsewhere.
- Defensive sectors (utilities, staples, health care) leading while the index rises: a cautious tape — buyers are hedging.
- Breadth: when only one or two sectors carry the index, rallies are fragile.
What it doesn’t tell you
Rotation is a map, not a signal. A top-ranked sector can still fall on a bad day, and a stock in a weak sector can break out on its own news. Use the ranks to decide where to look first, not what to buy.
Ranks also lag by design: they are built from returns that already happened. The useful edge is in the change — a rank improving — not in the rank itself.
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