The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Neither index funds nor actively managed funds automatically performs better or protects you when markets are volatile. An index fund is built to track a benchmark, so it generally keeps exposure to that market through declines. An active fund gives its manager discretion to change holdings, which may help in some conditions but can also lead to missed rebounds, higher costs or worse results. The useful comparison is between specific funds with similar objectives and risks—not between the labels alone.
What “volatile markets” can mean
Volatility can refer to rapid price swings, a sustained market decline, or both. These are not the same condition: a market can swing sharply without ending the period lower, and a gradual decline can occur without unusually large daily moves. Whether a fund has “held up” depends on which dates and measure you use.
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The evidence here is primarily U.S.-oriented investor education and provider materials. It does not establish a winner across all countries, asset classes or market episodes.
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How the two strategies differ
| Feature | Index fund | Actively managed fund |
|---|---|---|
| Primary approach | Seeks to track a specified index. | A manager selects investments in line with the fund’s objective and may seek to outperform a benchmark. |
| What happens to holdings | Holdings are generally selected to follow the index, though funds may use sampling rather than hold every index security. | The manager can adjust holdings within the fund’s mandate. |
| Exposure in a decline | Generally retains exposure to the securities or market represented by its benchmark. | Could reduce or change some exposures, but the mandate may limit what the manager can do. |
| Main uncertainty | How closely the fund tracks its index after costs and implementation differences. | Whether the manager’s decisions improve results relative to an appropriate benchmark after costs. |
The SEC describes index funds as subject to the risks of the securities they track, and notes that costs, trading and sampling can cause a fund’s results to differ from its index. See the SEC’s Investor Bulletin: Index Funds and its guide to mutual funds.
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Do index funds fall when the market declines?
They can. If an index fund tracks a market or segment that falls, the fund generally remains exposed to that decline; tracking an index is not a strategy for stepping out of falling markets. The result will not necessarily match the index exactly because the fund has expenses and may trade or sample differently. A fund’s name alone is not enough to tell you how much risk it takes: check its actual benchmark, holdings and stated risks.
How do active funds perform in down markets?
An active manager may sell or reposition investments, but discretion is an opportunity to respond—not a promise of downside protection or outperformance. Results depend on the manager’s decisions and the fund’s mandate. A repositioning can also be mistimed, miss a rebound or add trading costs.
Vanguard’s market-volatility Q&A says active managers’ discretion “can be really beneficial during market downturns.” That is Vanguard’s provider perspective, not evidence that active funds consistently outperform or avoid losses in downturns. The reviewed sources do not establish which approach delivered better downside results for comparable funds in named volatile episodes after fees and with survivorship bias addressed. Such a comparison would need to specify the category, benchmark, dates, share classes and methodology.
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Costs reduce investor returns. The SEC says that when two funds have identical performance, the lower-cost fund generally produces the higher return to its investor. But do not assume every index fund costs less than every active fund: compare the specific share classes and their full fee disclosures.
In a Vanguard report using annual-report net expense ratios and Morningstar data, asset-weighted average expense ratios for U.S.-domiciled mutual funds and ETFs were 0.09% for index funds and 0.56% for active funds as of December 31, 2025. These are category averages, not quotes for a particular fund. The same report estimates that investors would have paid roughly $570 billion more in cumulative costs since 2000 in a hypothetical absence of index funds; that estimate depends on the report’s assumptions and is not a directly observed saving for each investor. See Vanguard’s 2025 report.
For an individual fund, review the prospectus fee table for its expense ratio, sales loads and other disclosed expenses. Consider transaction or brokerage costs as well. The actual cost depends on the fund and share class, not just whether its strategy is active or indexed.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare two funds fairly
Compare funds that pursue similar goals and have similar exposures. A broad stock-market fund and a narrowly focused bond fund, for example, cannot be meaningfully ranked by how they behaved during the same decline without accounting for their different risks.
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- Match the mandate and benchmark. Check the investment objective, category, geography and benchmark in each prospectus. Make sure the benchmark represents the exposure you want to compare.
- Look through to holdings and concentration. Compare major holdings, sector or issuer concentrations, and other risk exposures. Index sampling or an active manager’s positioning may make a fund meaningfully different from its headline benchmark.
- Use identical dates and comparable measures. Compare drawdowns, volatility and returns over the same period. Where possible, use returns net of ongoing costs and state the asset class, geography and benchmark. Results can look different over another period.
- Inspect costs and trading activity. Review the full fee table, share class and any disclosed loads or other costs. For active funds, turnover may also matter for costs and taxable-account consequences.
- Check manager history in context. For an active fund, note the manager’s tenure and whether the cited record reflects the current manager and strategy. Past performance describes history; it does not predict future returns.
- Separate strategy from fund structure. ETF versus mutual fund is a different choice from active versus passive. The SEC says either structure can use either strategy. ETFs trade on exchanges during market hours at market prices that can differ from net asset value (NAV); mutual-fund shares generally transact at the next calculated NAV. See the SEC’s comparison of mutual funds and ETFs.
The SEC advises investors to review a fund’s prospectus and most recent shareholder report for its current strategy, risks, costs, manager, holdings and benchmark. Those documents are more useful than a stale comparison table or assumptions based on a fund’s name.
What performance history can—and cannot—tell you
Past performance does not predict future returns, as the SEC’s mutual-fund guide explains. Historical performance can still show how volatile a fund was over a specified period. It cannot, on its own, establish that the same manager or strategy will limit losses in the next decline.
Vanguard’s index-versus-active overview discusses the strategies generally; it should not be treated as a matched-fund study of downside results during particular volatile episodes. A fair episode-specific verdict requires comparable funds, consistent dates and fee treatment, and a stated method.
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