What is Trailing PE (TTM)? Best Way to Compare Current Valuation
Trailing PE uses actual reported earnings, not guesses about the future.
Trailing P/E (also called TTM P/E) uses the earnings per share from the last twelve months, calculated by adding up the last four quarters of actual reported earnings. It is based on real, audited numbers rather than estimates, making it the most reliable P/E measure.
If a company reported EPS of Rs.12 in Q1, Rs.15 in Q2, Rs.10 in Q3, and Rs.13 in Q4, the trailing twelve months EPS is Rs.50. Divide the current stock price by Rs.50 to get the trailing P/E. This number is factual and verifiable.
Trailing P/E = Current Stock Price / Sum of Last 4 Quarters EPS
If stock price is Rs.750 and last 4 quarters EPS: 18 + 20 + 17 + 19 = 74: Trailing P/E = 750 / 74 = 10.1x
Why is trailing P/E preferred for comparison?
Because it uses actual reported numbers, everyone calculates the same trailing P/E. Forward P/E varies by analyst. Trailing P/E is objective. When comparing two companies or checking historical valuation, trailing P/E provides a consistent baseline without estimate bias.
What are its limitations?
Trailing P/E looks backward. A company with declining earnings will show a low trailing P/E (looks cheap) but the low P/E masks future problems. Conversely, a company with rapidly improving earnings will show a high trailing P/E that overstates the true valuation because recent quarters are stronger than the TTM average.
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Frequently Asked Questions
How often does trailing P/E change?
Every day because the stock price changes. The EPS component updates every quarter when new results are reported. After each quarterly result, the oldest quarter drops off and the newest is added.
Can one-time items distort trailing P/E?
Yes. A large one-time profit (asset sale) reduces trailing P/E artificially. A one-time loss inflates it. Always check if TTM EPS includes exceptional items. Adjusted P/E excluding one-time items gives a cleaner picture. Use StockkAsk at stockk.trade/stockkask for adjusted P/E calculations.
Is trailing P/E enough or do I need forward P/E too?
Use both. Trailing P/E tells you what you are paying relative to proven earnings. Forward P/E tells you what you are paying relative to expected earnings. The gap between them reveals market expectations about earnings growth or decline.
What trailing P/E is typical for NIFTY 50?
Historically between 18 and 24. Below 15 is undervalued territory (2008, 2020 lows). Above 28 is overvalued territory. The long-term average around 20 to 22 is a useful anchor for market-level valuation.
How do seasonal businesses affect trailing P/E?
Companies with strong seasonal earnings (Q3 for retail, Q4 for construction) may show distorted trailing P/E depending on which quarters are included. Annual EPS smooths this seasonal effect. Use full-year EPS for seasonal businesses.
Investments in securities market are subject to market risks. This article is for educational purposes only and does not constitute investment advice.
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