If You Invested $10,000 in the S&P 500 10 Years Ago: $42,798

$10,000 put into the S&P 500 at the close on 13 October 2016 was worth $42,798 ten years later, on 13 October 2026. The S&P 500 is an index that tracks 500 large companies listed in the United States. Reaching that balance meant sitting through a fall of 33.7% in early 2020.

An exchange-traded fund, or ETF, is a fund whose shares trade on a stock exchange like any other share. The figure above is the record of SPY (the S&P 500 ETF). It counts dividends, the cash a company pays out to its shareholders, as reinvested in more shares of the fund.

The $42,798 uses prices adjusted for dividends. Each payment is treated as buying more shares of the fund on the day it is paid, so every earlier price is written down to match. The adjusted price for 13 October 2016 is 181.79, lower than SPY's actual close that day of 213.01.

Dividing the 13 October 2026 close of 778.01 by that adjusted 181.79 gives about 4.28 times the starting money. So $10,000 became $42,798, a gain of 328% over the ten years. The prices are rounded for display here; the exact multiple of 4.2798 comes from the unrounded 181.7868.

The chart shows the balance on each 13 October, or on the next trading day where that date fell at a weekend. It was higher than the year before in nine of the ten years. The exception was the year to 13 October 2022, when the balance fell 14.63%, from $22,387 to $19,112.

Spread evenly across the ten years, the gain works out at 15.65% a year. This is the compound annual growth rate: the steady yearly rate that would turn the starting sum into the final one.

This is one lump sum left alone for ten years. Investing $100 a month for ten years runs the same kind of sum for money paid in month by month.

The fund collects the dividend payments made by the companies in the index. It passes them on to the people who own the fund. The adjusted price series treats each payment as buying more shares on the day it arrives.

Counting the change in the share price alone, from 213.01 to 778.01, $10,000 would have become $36,525. With every dividend used to buy more of the fund, it became $42,798. Reinvested dividends added $6,273.

That is why any figure like this has to say whether dividends are counted. Our explainer on dividends sets out how the payments work.

A US Treasury bill is a loan to the US government for a year or less. It is backed by the government's credit and repaid quickly, so its price moves very little. That makes it the comparison used here for money kept out of the market.

Earning the three-month Treasury bill rate on $10,000 from October 2016 to September 2026, the latest month published as at 14 October 2026, would have left $12,749. That sum compounds each month's own published rate. The mean of those 120 monthly rates was 2.43% a year, which is not the same thing as the compounded outcome.

Cash earning no interest would still be $10,000. The fund finished $30,049 ahead of the Treasury bill result, 3.36 times as large.

A drawdown is the fall from the highest point a balance has reached to its lowest point before it makes a new high. It is the measure that shows what holding the fund demanded along the way.

The chart shows how far below its own previous high the balance sat on each day of the ten years. The deepest drawdown came on 23 March 2020, 33.7% down.

The balance stood at $16,913 on 19 February 2020 and $11,213 at the low on 23 March 2020. Only 23 trading days separated the two. A trading day is a day the US market is open.

The old high was passed again on 10 August 2020, 173 calendar days after the 19 February peak.

The longest wait came after the 2022 fall. The balance dropped 24.5% from its high on 3 January 2022 to its low on 12 October 2022. It reached the old level again on 13 December 2023, 709 calendar days after that January peak.

That 24.5% runs from the January high to the October low. The 14.63% above is the change between two 13 Octobers, so the two figures measure different things.

Both falls were made back in full. What a drawdown is goes through the measure.

The window holds 2,513 trading days, giving 2,512 daily moves. Drop the ten largest daily gains and compound what is left. The $42,798 becomes $22,599.

Those ten days sit close together. Six of them fall in March 2020, four inside the fall itself and two in the days just after the low. The largest single day was 9 April 2025, up 10.50%.

The chart puts the four outcomes side by side. Missing 0.4% of the trading days leaves 52.8% of the final balance, a shortfall of $20,199. The growth rate falls from 15.65% a year to 8.50%.

That calculation measures what happened. It gives no way of picking those days in advance. The ten worst days of the ten years all fell inside two stretches, February to June 2020 and April 2025. Eight of the ten best days fell inside those same stretches, so the best days and the worst days arrived together.

Tax is the first thing missing. A holder pays tax on the dividends received and on any gain when the fund is sold. The rates depend on where the holder lives and on the account the fund sits in. How dividends are taxed covers the UK and US rules.

Fees are the second. SPY's own charge was 0.0945% a year as at 30 June 2026, taken out of the fund's assets before its price is struck, so it already sits inside the $42,798. An investment platform charging 0.25% a year on top of that would have left $41,740.

Inflation is the third. The Consumer Price Index is the main US measure of what households pay for goods and services. It rose 38.2% between October 2016 and August 2026, the latest month published as at 14 October 2026.

That rise is an index ratio of 1.3822. Dividing the $42,798 by it leaves $30,964, the same balance measured in October 2016 money.

So $10,000 became $42,798 over the ten years to 13 October 2026, or $30,964 once the rise in prices is taken out. Both that gain and the 33.7% fall inside it are measurements of what has already happened.

$10,000 put into SPY, the S&P 500 ETF, at the close on 13 October 2016 was worth $42,798 at the close on 13 October 2026, with dividends reinvested. That is 4.2798 times the starting sum. On the share price alone, without dividends, it would be $36,525.

The fund tracking the index grew at 15.65% a year over the ten years to 13 October 2026, with dividends reinvested. That is the compound rate, the steady yearly rate that turns $10,000 into $42,798. The mean of the ten yearly changes is higher, at 16.43%, because an average of yearly changes is not what the money compounded at.

The deepest fall was 33.7%, from 19 February 2020 to 23 March 2020. A balance of $16,913 became $11,213 in 23 trading days. The old high was passed again on 10 August 2020, 173 calendar days after the February peak.

Dropping the ten best days out of 2,512 daily moves leaves $22,599 in place of $42,798, a growth rate of 8.50% a year in place of 15.65%. The ten worst days of the same ten years all fell inside two stretches, February to June 2020 and April 2025.

This explainer is part of the YX Insights Academy. Each one takes a single idea and checks it against real data.

The same approach runs through everything else we publish:

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DISCLAIMER: This article is strictly educational. Any information or analysis in this note is not an offer to sell or the solicitation of an offer to buy any securities. Nothing in this note is intended to be investment advice and nor should it be relied upon to make investment decisions. Any opinions, analyses, or probabilities expressed in this note are those of the author as of the note's date of publication and are subject to change without notice.