A 20% drop feels like a signal to act. The first job is to find out what actually happened: the market, your structure, or a change in the companies you own. Here is how to diagnose it before deciding anything.
First, find out why it dropped. Then decide. A fall that matches the market is a different problem from a fall caused by two stocks you own too much of, and both differ from a fall in a company whose business has changed.
Acting before you know which one you have is how investors end up selling the wrong thing at the wrong time. Nothing here tells you to buy, sell or hold. It is a way to see your situation clearly before you decide, ideally with a written plan you made in calmer times.
More than you lost, because the gain starts from a smaller base. This is plain arithmetic:
| Drop | Gain needed to recover | On $250,000 (illustrative) |
|---|---|---|
| −10% | +11.1% | $225,000 back to $250,000 |
| −20% | +25.0% | $200,000 back to $250,000 |
| −30% | +42.9% | $175,000 back to $250,000 |
| −50% | +100% | $125,000 back to $250,000 |
History shows broad-market drops followed by recoveries of very different lengths. In Exent’s data, as of Sep 30, 2026, the S&P 500 fell 34.1% peak to trough in the 2020 COVID crash and still ended 2020 up 18.3%. After falling 18.2% in 2022, it gained 26.2% in 2023. The 2007–09 crisis took years to recover from. Past recoveries do not promise future ones, and single stocks may never recover. See how long crash recoveries take and loss recovery math.
Compare your drop with assets of different kinds over the same period. In our data since mid-2016, there were 16 months in which the S&P 500 (SPY) fell more than 4%. Average returns in those months:
| Asset | Average return in those 16 months |
|---|---|
| Russell 2000 small caps (IWM) | −8.4% |
| Nasdaq-100 (QQQ) | −7.6% |
| S&P 500 (SPY) | −6.7% |
| Minimum-volatility stocks (USMV) | −4.9% |
| Long-term Treasuries (TLT) | −1.9% |
| US aggregate bonds (AGG) | −1.2% |
| Gold (GLD) | −0.4% |
| 1–3 month T-bills (BIL) | +0.2% |
Illustrative: if your $250,000 portfolio fell 20% ($50,000) while the S&P 500 fell 10%, about half of your loss came from how the portfolio is built, not from the market. That points to concentration or a cluster of similar holdings. In the 2022 bear market, 338 of 464 large US stocks in Exent’s data fell more than the index. Our what diversifies study has the details.
A calm, structured review helps most right now: which positions drove the loss, which holdings cluster together, how the portfolio compares with a risk-matched benchmark and how the same holdings behaved in earlier selloffs. If you need the money soon, or the drop changes your plans, a fee-only financial planner can help with the decision. The portfolio stress test guide shows how to run the same check by hand.
That depends on why it dropped and when you need the money, so first diagnose the cause. Historically, selling near a low has locked in losses for investors who then missed the recovery, but single stocks do not always come back.
There is no fixed answer. A 20% loss needs a 25% gain to break even. In Exent’s data the S&P 500 fell 18.2% in 2022 and rose 26.2% in 2023, but other recoveries have taken years.
Usually concentration: a few large positions or a cluster of similar stocks. In the 2022 bear market, 338 of 464 large US stocks in Exent’s data fell more than the S&P 500.
For a stock portfolio, yes, from time to time. In Exent’s data the S&P 500 fell 25.4% peak to trough in 2022 and 34.1% in the 2020 COVID crash.
In Exent’s data since mid-2016, in the 16 months when the S&P 500 fell more than 4%, T-bills averaged +0.2% and the AGG bond ETF −1.2%, against −6.7% for the index.
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Educational content, not investment advice. Examples are illustrative; past performance does not guarantee future results.