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P/E Ratio: Definition, Interpretation, and Examples

The price-to-earnings (P/E) ratio is a fundamental valuation metric used to determine whether a stock is overvalued or undervalued. It represents the amount an investor is willing to pay for each dollar of a company's earnings. A high P/E ratio could suggest that a stock is overvalued or that investors are expecting high growth in the future. Conversely, a low P/E ratio might indicate undervaluation or slower growth expectations. Comparing a company's P/E ratio to its peers or its historical P/E can provide valuable insights. For example, this page references three high-profile stocks to provide examples of P/E ratio interpretation.

クイックアンサー This page provides a guide to understanding the price-to-earnings (P/E) ratio, a key valuation metric used to assess if a stock is overvalued or undervalued. The P/E ratio is calculated by dividing a company's stock price by its earnings per share (EPS), indicating how much investors pay for each dollar of earnings.
Examples3Screens60Average score77.00Updated2026-04-10Prices as ofOct 26, 2026 session

数値はFinancial Modeling Prep（FMP）から取得しています。FMPに銘柄の数値がない場合、株価またはファンダメンタル指標はYahoo Financeの代替データ、株価はAlpacaの代替データになることがあります。SEC EDGARは提出書類へのリンクと企業の識別情報（正式社名、所在地）にのみ使用し、数値には使用しません。

MoonshotScore V2は、米国上場の対象企業を同じセクターの企業と比較し、5つの柱で0〜100点に評価します：事業の質（ウェイト26）、財務の安全性（ウェイト20）、バリュエーション（ウェイト18）、成長の持続性（ウェイト16）、モメンタム（ウェイト12）。ニュースのセンチメントやアナリストのデータは使用せず、将来のリターンの確率ではありません。

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Understanding the Price-to-Earnings (P/E) Ratio

The price-to-earnings (P/E) ratio is a key valuation metric that compares a company's stock price to its earnings per share (EPS). It provides investors with insight into how much the market is willing to pay for each dollar of reported earnings. This guide offers an overview of the P/E ratio, its calculation, interpretation, and limitations.

Worked Example: These Figures Today

The companies used as examples above, with the current figures behind them. Illustrations of the metric — not a ranking, not a shortlist, and not a recommendation.

Example companies for this topic, listed in the order the guide introduces them — prices, day change and market cap as of the Oct 26, 2026 trading session (FMP quote); P/E and MoonshotScore from our latest stored data. Source: Financial Modeling Prep, Yahoo Finance.
Ticker Company Price Change Market Cap MoonshotScore
AAPL Apple Inc. $343.91 -1.10% $5.0T 89
MSFT Microsoft Corporation $532.60 +1.54% $4.0T 85
TSLA Tesla, Inc. $391.62 +5.21% $1.5T 57

P/E Ratio in Context: Examples

Here are some well-known companies and their P/E ratios, for illustrative purposes: * **AAPL:** Apple Inc. * **MSFT:** Microsoft Corporation * **TSLA:** Tesla, Inc.
“MoonshotScore V2は、NASDAQ、NYSE、AMEXに上場する適格な普通株とADRを、セクター内で比較する5つの柱に基づき0〜100点で評価します。ETF、OTC銘柄、米国外の取引所上場銘柄は対象外です。V2スコアがない場合でも、旧V1で代用しません。投資調査のための指標であり、売買の推奨ではありません。”
— Stock Expert AI published methodology (how MoonshotScore works)

Questions worth resolving before acting on the screen

What does a high P/E ratio indicate?

A high P/E ratio may suggest that a stock is overvalued, or that investors anticipate higher earnings growth in the future. It's important to compare the P/E ratio to those of competitors and industry benchmarks.

What does a low P/E ratio indicate?

A low P/E ratio can suggest that a stock is undervalued, or that the market has low expectations for future earnings growth. However, it could also reflect underlying problems with the company.

What are the limitations of using the P/E ratio?

The P/E ratio does not provide a complete picture of a company's financial health. It should be used in conjunction with other financial metrics and qualitative factors. Also, negative earnings result in an undefined P/E ratio, making comparisons impossible.

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Stock Expert AI provides data and analysis tools for educational purposes. This is not financial advice. Past performance does not guarantee future results. Always consult a qualified financial advisor before making investment decisions. 数値はFinancial Modeling Prep（FMP）から取得しています。FMPに銘柄の数値がない場合、株価またはファンダメンタル指標はYahoo Financeの代替データ、株価はAlpacaの代替データになることがあります。SEC EDGARは提出書類へのリンクと企業の識別情報（正式社名、所在地）にのみ使用し、数値には使用しません。