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SPY backtest — split-buying returns and maximum drawdown

Holds 500 US large caps. The oldest US-listed ETF.

Last close
$759.97
From 52-week high
-2.5%
Leverage
1x
Listed
1993-01

Prices as of 2026-10-23. Source: Data via FinanceDataReader · Policy rate via FRED (Federal Reserve Bank of St. Louis).

What SPY is

SPY is State Street's S&P 500 fund, launched in January 1993 and the oldest ETF in the US. It is still among the most heavily traded ETFs, and its history is the reason this site's prices start in 1993.

Its thirty-plus years include the dot-com bust (2000–2002), the financial crisis (2007–2009), the 2020 crash and the 2022 hiking cycle. The deepest fall came in the financial crisis, and regaining that high took several years. That long record is the base for reconstructing leveraged funds before they existed.

Split buying on SPY usually keeps drawdowns small but trails buy and hold by a wide margin, because much of the seed stays in cash. Treat it as a reference point for comparing return with drawdown. For why drawdown matters, see maximum drawdown; for reading annualised returns, see CAGR vs total return.

The deepest fall since listing

Using real closing prices only (adjusted for splits and dividends) from 1993-01-29, SPY's worst peak-to-trough fall was -56.5%, from the 2007-10-09 high to the 2009-03-09 low over 355 trading days. It took another 1011 trading days (about 4.0 years) to get back above that high, on 2013-03-14. The last close is 2.5% below the all-time high.

A fall of 56.5% needs a 130% gain to get back to even. Any strategy on SPY has to be judged on whether you could have held it through a stretch like this. Why drawdown comes before return.

How much SPY moves in a day

The standard deviation of daily returns is 1.17% over the whole history and 0.80% over the last year. By the rough rule days ≈ (target ÷ daily volatility)², a 1.5% take-profit target needs about 3.5 trading days at the recent pace. Where the rule comes from.

Ten years of split buying on SPY

Three preset strategies run over 2016-01-04 to 2026-10-23 with a $10,000 seed and 0.1% fees, alongside simply holding the same instrument.

Strategy Return Max drawdown CAGR Trades Win rate
A2 Standard, base rules (no defence signal) +75.73% -18.03% +5.37% 1194 46.0%
A1 Defensive, base rules +31.75% -14.69% +2.59% 1203 84.6%
A3 Aggressive, base rules (no defence signal) +66.99% -21.94% +4.87% 1026 42.4%
Buy and hold +276.20% -34.02% +13.08% --

Read the drawdown column before the return column. Split buying leaves much of the seed in cash, which is the main reason its drawdown is smaller — treat it as lower exposure rather than protection.

Test SPY with your own settings →

Year by year

The standard (diamond) preset, one calendar year at a time. A strategy worth using should have good years and bad years mixed — if one year made everything, that was the year, not the rules.

Year Strategy Strategy MDD Buy and hold B&H MDD
2026 +1.76% -7.31% +10.93% -9.06%
2025 +13.59% -10.73% +16.32% -18.91%
2024 +7.63% -3.92% +23.60% -8.36%
2023 +8.35% -6.91% +24.34% -10.21%
2022 +0.23% -12.53% -19.95% -25.31%
2021 +10.94% -4.20% +28.44% -5.40%
2020 +4.45% -13.72% +14.73% -33.84%
2019 +4.42% -5.78% +28.09% -6.56%
2018 -10.57% -16.67% -7.17% -20.09%
2017 +5.61% -2.61% +18.10% -3.01%

Across these 10 years the strategy beat buy and hold in 1 and trailed it in 9. It lost money in 1 year; buy and hold lost in 2. In SPY's worst year here, 2022, holding returned -19.9% while the strategy returned +0.2%. In its best year, 2021, holding returned +28.4% and the strategy +10.9%. Giving up much of the best years is the price of the smaller drawdowns.

Questions about SPY

How far back can SPY be tested?

SPY listed in 1993-01. Nothing before that date exists, so any claim about how it would have behaved in an earlier crisis is guesswork. For older periods, test a 1x index ETF instead.

Why does the strategy show no trades sometimes?

Whole shares only. If a tranche is allocated less than one share's price, it buys nothing. Raise the seed or lower the number of tranches.

Can I see what to buy today?

The Today's Orders page computes the next session's buy limit and each tranche's sell target from your start date. It is a calculation, not advice, and no orders are placed.

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