To see whether a stock beat or lagged its sector and the broader market on a particular day, compare their close-to-close percentage returns over the same trading interval. Subtract the sector proxy’s return from the stock’s return, then do the same with a relevant broad-market index. Report each result in percentage points and name the exact comparators.
Calculate each daily return, then subtract
Use the closing value on trading day t and the previous trading day’s close for the stock, sector measure, and broad index:
Daily percentage return = (close on day t ÷ close on prior trading day − 1) × 100
Then calculate the two spreads:
- Sector-relative spread: stock return − sector return.
- Market-relative spread: stock return − broad-index return.
Suppose, hypothetically, a stock returned 1.8%, its sector proxy returned 0.6%, and a broad index returned 0.4% over the same interval. The stock was ahead of the sector by 1.2 percentage points and ahead of the index by 1.4 percentage points that day. These are differences between returns, not returns earned by a portfolio.
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For example, if the stock’s return was −2% and the sector’s was −3%, the stock was ahead of the sector by 1 percentage point even though both fell. A positive spread means the stock did better over the chosen interval; a negative spread means it did worse.
Choose comparators that answer the question
“The sector” and “the market” are not single, universal series. An index is a group of securities whose overall performance is used as a benchmark, as Vanguard explains. Choose measures that fit the company and state their names and scope.
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- Sector comparison: use a sector index or an exchange-traded fund (ETF) whose mandate and holdings reasonably match the company’s business.
- Market comparison: use a broad index relevant to the company’s listing and market exposure.
A sector ETF is a fund, not a pure sector statistic: its holdings and traded market price affect its return, and its market price can differ from its net asset value (NAV). Check the fund’s own materials when its benchmark, holdings, or price basis matters. Investor.gov’s ETF bulletin describes ETF pricing and fund information.
Also check whether the stock itself is a constituent of the sector index or ETF. If it is, its movement contributes to the comparator, so the spread is not a comparison with a sector measure independent of that company.
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A valid comparison uses compatible observations. Pairing a live stock quote with an index’s completed close, or comparing closing prices from markets that shut at different times, can produce a misleading “daily” gap.
- Interval and date: use the same start and end points and account for each exchange’s trading calendar and holidays.
- Observation type: identify whether each value is a stock closing price, official index close, ETF market close, or NAV.
- Currency: use returns in a consistent currency, or disclose currency differences and their effect.
- Return basis: compare price returns with price returns, or total returns with total returns.
A price index tracks price movements; a total-return index also reflects dividend income, generally assuming reinvestment under its methodology. For example, the SEC-hosted filing describing S&P 500 index calculations distinguishes the S&P 500 price index from its Total Return Index. A stock’s price return compared with an index’s total return is therefore not an even comparison. This difference can matter around ex-dividend dates.
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Distinguish a daily spread from longer-term relative performance
The subtraction answers how the stock performed relative to a comparator over one interval. If the question is instead how much wealth the stock gained relative to a benchmark, calculate relative return as a ratio. For one interval, with returns expressed as decimals:
Relative return = (1 + stock return) ÷ (1 + benchmark return) − 1
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For multiple days, compound the daily returns for each series, or compound the daily relative-return ratios. Do not add daily percentage-point spreads and call the sum compounded relative performance.
For a longer evaluation, keep the benchmark and return basis consistent across the dates. Annualized or risk-adjusted measures can add context; Vanguard’s performance guidance discusses using relevant benchmarks and putting performance in perspective.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Interpret the result narrowly
Say, for example, “the stock outperformed the named sector ETF by 1.2 percentage points over that close-to-close interval.” “Outperformed” describes only the selected period and comparator. It does not identify the reason for the move, demonstrate investment skill, or predict what happens next.
A one-day subtraction is not tracking error. SEBI’s explanation of tracking error describes it as measuring differences between portfolio and benchmark returns, a concept involving deviations across observations rather than the name for one stock’s daily spread.
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Be especially careful when interpreting daily results for leveraged or inverse funds. Their objectives may target daily returns, and compounding and product terms mean that a daily target should not automatically be treated as a longer-term result; see ProShares’ performance and pricing FAQ.
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