LTM P/E: The Rolling Trailing Earnings Multiple

Key Takeaways

• Last twelve months PE LTM divides price by the sum of EPS for the last four reported quarters.
• LTM rolls forward each quarter, unlike static fiscal year PE which only updates once a year.
• The most common mistake is using LTM at cycle extremes when earnings are about to revert.
• LTM is most reliable for stable businesses and least reliable for cyclical or one-off heavy firms.

What It Is

LTM P/E, last twelve months price to earnings, equals current share price divided by the sum of EPS over the most recent four reported quarters. LTM is sometimes called trailing twelve months, or TTM, the two terms are interchangeable in practice.

The formal calculation handles the latest year-to-date data cleanly.

LTM EPS = Latest Fiscal Year EPS + Current YTD EPS - Prior-Year YTD EPS

This formula was popularized in Corporate Finance Institute training materials and is the standard convention in financial databases. It avoids double counting and updates the denominator at each new quarter without waiting for fiscal year end.

The Intuition

LTM exists because static fiscal year multiples grow stale quickly. By the third or fourth quarter, a P/E based on last fiscal year's EPS reflects performance from over a year ago. LTM keeps the window rolling so the denominator is always the most recent four quarters of realized performance.

The advantage is reliability. LTM uses real reported earnings, not estimates. The disadvantage is direction. LTM looks backward, capturing the company that was, not the company that is. For high growth or cyclical names, the difference between LTM and NTM can be dramatic.

How It Works

The formula in its simplest form is.

LTM P/E = Current Share Price / LTM EPS

LTM EPS is computed from quarterly reports. After the third quarter is reported, LTM EPS equals full prior fiscal year EPS, plus the year to date EPS through Q3 of the current year, minus the year to date EPS through Q3 of the prior year.

LTM multiples are most useful as a backward looking sanity check on forward multiples. If NTM P/E is 15x but LTM P/E is 30x, the market is paying for a sharp expected earnings rebound. Test whether that rebound is plausible before relying on the forward number.

Worked Example

Take a hypothetical company. The most recent fiscal year EPS was 5.00 dollars. Current year-to-date EPS through Q3 is 4.20 dollars. Prior year-to-date EPS through Q3 was 3.60 dollars.

LTM EPS equals 5.00 plus 4.20 minus 3.60, or 5.60 dollars.

Share price is 140 dollars. LTM P/E equals 140 divided by 5.60, or 25.0x.

Compare with NTM P/E. Consensus expects 6.40 dollars over the next four quarters, giving NTM P/E of 21.9x. The 3 turn difference between LTM and NTM reflects the consensus expectation of 14 percent EPS growth. A practical decision rule is to use both. LTM grounds the analysis in reality, NTM frames the expected return on the stock.

Common Mistakes

1. Cycle distortion. LTM at a cyclical earnings peak makes the stock look cheap. LTM at a cyclical trough makes it look expensive. Always check where in the cycle earnings sit, ideally with mid cycle normalized EPS.
2. One-time items. Restructuring charges, asset sales, and tax benefits all distort LTM EPS. Decide whether to use GAAP or adjusted EPS, and apply that choice consistently across peers.
3. Quarter end gaps. Right after a fiscal year end and before Q1 reporting, some data providers continue to show stale LTM. Verify the LTM is genuinely rolling, not stuck on prior fiscal year.
4. Comparing LTM with NTM across peers. A peer table that mixes LTM and NTM multiples creates a misleading comparison. Pick one convention and apply it to every firm.
5. Treating LTM as the only number. McKinsey research finds forward multiples more accurate predictors of value than trailing multiples. LTM is useful, but should not stand alone as the valuation reference.

Frequently Asked Questions

What is last twelve months PE LTM in simple terms? It is the share price divided by the sum of EPS for the last four reported quarters. The window rolls forward each quarter so the denominator stays current.

How does LTM PE affect investment decisions? LTM grounds valuation in actually reported numbers, which is harder to manipulate than forward estimates. In the example, the 25x LTM gave a real anchor against the 21.9x NTM based on consensus.

What is a real-world example of LTM PE? Public US large cap indices report LTM PE alongside forward PE, with the LTM number commonly running 1 to 4 turns higher than forward in expansionary periods and lower in earnings recoveries.

How can investors use LTM PE effectively? Use it as a sanity anchor for forward multiples. If LTM PE is far above NTM PE, the market is pricing a strong earnings rebound. Test the rebound assumption rather than accepting the optimistic forward number at face value.

How is LTM PE different from NTM PE? LTM uses the last four reported quarters of EPS. NTM uses the next four expected quarters from analyst consensus. LTM is more reliable but backward looking, NTM is forward looking but estimate dependent.

Sources

1. Corporate Finance Institute. Last Twelve Months (LTM). https://corporatefinanceinstitute.com/resources/valuation/last-twelve-months-ltm/
2. Corporate Finance Institute. Trailing Twelve Months (TTM). https://corporatefinanceinstitute.com/resources/valuation/railing-twelve-months-ttm-definition/
3. CFA Institute. Market-Based Valuation: Price and Enterprise Value Multiples. https://www.cfainstitute.org/insights/professional-learning/refresher-readings/2026/market-based-valuation-price-enterprise-value-multiples
4. McKinsey & Company. The right role for multiples in valuation. https://www.mckinsey.com/capabilities/strategy-and-corporate-finance/our-insights/the-right-role-for-multiples-in-valuation

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.