1 Week, 1 Month or Year-to-Date: Which Sector Return Window Should You Trust?

Open any sector table and you will usually see three columns: one week, one month, year-to-date. They routinely disagree. In late September 2026, US Utilities were down 3.87% on the week, down 9.19% on the month, and still down 7.45% for the year, while US Energy was down 3.53% on the week but up 38.76% for the year. Which one is "the" story? All of them, at different speeds. Educational only, not investment advice.

What each window measures

• 1 week (5 trading days). Mostly news and flows. A single data release, a central-bank meeting or an earnings surprise from one heavyweight can dominate it.
• 1 month (about 21 trading days). Long enough to smooth out a single headline, short enough to catch a shift in leadership while it is still young.
• Year-to-date. Measured from last year's close. It tells you where the sector sits in the year's narrative, but it depends heavily on the calendar: in October it covers nine months, in February it covers six weeks.

What each window is good for

Reading the three together

The useful information is in the combinations, not in any single number.

You can read these combinations in the US sector returns by comparing the 1W, 1M and YTD columns within each row.

1. All three positive. An established leader. The question is not "is it strong" but "is it getting crowded".
2. 1W up, 1M down, YTD down. A bounce inside a downtrend. Most of these fade; wait for the one-month figure to turn before reading anything into it.
3. 1W down, 1M up, YTD up. A pause inside an uptrend. Usually noise, unless it repeats for several weeks.
4. 1W and 1M up, YTD down. The interesting one: a laggard whose recent behaviour has changed. These are the rows worth a closer look.
5. All three negative. An established laggard. Same logic as case 1, inverted.

A simple rule

Let the one-month column decide direction, let the one-week column decide urgency, and let year-to-date supply context. If you only have time to look at one number, look at one month.

Two traps

• Comparing YTD across markets without checking the base. A sector that fell sharply last December starts the year from a low base and will look strong on YTD for months. Check what happened just before the start date.
• Treating a big weekly number as a trend. A +6% week after a -10% month is still a sector that is down on the month.

Where to see all three at once

Sector Pulse (below) shows 1W, 1M and YTD for all 11 US SPDR sectors and all 17 TOPIX-17 sectors in one table, updated daily, so you can read the combinations instead of a single column.