Summing the last four consecutive quarters to standardize the comparison period across companies with different fiscal years.
What the abbreviation means
Trailing Twelve Months (TTM · Trailing Twelve Months) is a measuring window that adds up the latest four reported quarters, instead of relying on an old fiscal year or one volatile quarter. It gives you a full-year picture that moves with every report: as fresh as possible, as broad as sensible.
Why it is the preferred window
The latest fiscal year can be up to eleven months old, and a single quarter is shaped by seasonality (a retailer's holiday quarter looks nothing like its summer). The rolling window cancels seasonality by adding up a full cycle, and it stays fresh. That is why it became the standard for valuation multiples.
How it is calculated
Last fiscal year + the quarters reported since − the same quarters a year earlier. TTM earnings are the denominator of the common P/E Ratio, and TTM revenue is the denominator of the revenue multiple. That is how companies get compared on one fair window.
Hypothetical example
A company reports two strong quarters after a weak year. Its multiple on the old fiscal year looks like 30 and on the rolling window 22. The gap is not an opinion, it is fresher data. Comparing it with a rival on a different window treats one of them unfairly.
Common mistake
Mixing windows in one comparison: one company's multiple on TTM against another's on forward estimates (Forward) compares apples to oranges. The window is part of the number, not a footnote to it.
Where to see it on the platform
Sector comparisons from SEC profiles calculate ratios on the same rolling window, so comparisons within each sector hold up.
Why it is used instead of the fiscal year
A fiscal year ends on a fixed date, which leaves the analyst with a picture that is months old. The rolling twelve-month window updates with every quarter reported, so it catches a shift that happened three months ago, not twelve. It also cancels seasonality: comparing one quarter with another in a seasonal business misleads, while the sum of four quarters evens them out.
Where to see it on the platform
All sector comparison ratios are calculated on this window, so companies are measured with the same ruler.
