The hammer is one of the first patterns almost every trader learns. A long lower wick, a small body near the top, appearing after a sustained fall. The story it tells is a good one: sellers drove price down all session, buyers took every cent of it back before the close, and the trend is about to turn.
It is a genuinely useful thing to be able to read. Whether it is a strategy is a different question, and it is the kind of question a chart cannot answer — because your eye finds the hammers that preceded a reversal and slides past the ones that did not.
So we counted them. On 9 September 2026 we ran the pattern across every stock in the S&P 500 on Trade Manager. It returned −32.7%. This guide is what the test actually showed and, more usefully, why it lost.
The rules we tested
Two conditions, both on the daily timeframe, across all 503 index members:
- Trigger — a hammer candle. A small body, a lower wick at least twice its length, and almost no upper wick.
- Confirmation — RSI(14) below 30. A reading under 30 means the last fourteen bars have been overwhelmingly red and selling pressure is exhausted. This filter exists so the pattern is only taken where a reversal has something to reverse from.
- Exits — a 4% target and a 3% stop, fixed, no discretion.
Nothing here is exotic. It is close to the textbook version of the setup, which is what makes the result worth publishing.
The result
| Metric | Value |
|---|---|
| Signals | 106 (97 closed by the end of the window) |
| Won | 41 |
| Lost | 65 |
| Win rate | 38.7% |
| Result | −32.7% |
| Maximum drawdown | −54.3% |
| Average hold | 4 bars |
| Universe and window | 503 of 503 tickers, 150 calendar days |
Nine of the 106 signals had not reached either exit when the window closed and were valued at the last price. Excluding those, the win rate is 38.1% rather than 38.7%. Both numbers matter for the same reason, which is the next section.
Why it lost, in one line of arithmetic
A 38.7% win rate sounds survivable. Most traders would guess that a strategy winning nearly four times in ten, with a target larger than its stop, roughly breaks even.
It does not, and the reason is fixed before a single trade is taken:
Break-even win rate = stop ÷ (target + stop)
With a 4% target and a 3% stop, that is 3 ÷ (4 + 3) = 42.86%. The strategy scored 38.7%. It was short by 4.2 percentage points — and those 4.2 points are the difference between roughly flat and losing a third of the account.
This is the part that is genuinely counter-intuitive. The gap looks small. Its consequence is not, because it compounds across 106 trades and because a −54.3% drawdown along the way means the account was less than half its starting size at the worst point, and every subsequent 4% win was 4% of a much smaller number.
The same signals with different exits
Nothing about the hammer changes if you move the exits. The requirement does:
| Target / stop | Break-even win rate | 38.7% clears it? |
|---|---|---|
| +3% / −3% | 50.0% | No |
| +4% / −3% (this test) | 42.9% | No — short by 4.2 |
| +6% / −3% | 33.3% | Yes |
| +9% / −3% | 25.0% | Yes |
That table is not a recommendation to widen the target until the maths works. A wider target is hit less often, so the win rate falls as you move down the rows — you cannot hold one column still and move the other. It is there to make a narrower point: the same pattern is a winning or losing strategy depending on a setting that has nothing to do with the pattern. Which is why "does the hammer work" is not really a question that can be answered.
What the pattern is still good for
None of this makes the hammer useless. It makes it a shortlist, which is what most candlestick patterns actually are. It tells you where buyers showed up with conviction. It does not tell you what happens next, and the results above are what happens when you treat the first statement as though it were the second.
Read the guide on backtesting a breakout strategy and you will find the identical shape of failure: a well-known setup, a sensible-looking confirmation filter, a win rate a few points under what its payoff demanded, and a losing result. The pattern differs. The arithmetic does not.
How to run this test yourself
The result above is one strategy on one window. Yours will differ, and the point of a backtest is that you do not have to take anyone's word for it:
- Open the strategy builder and pick a universe — the S&P 500, the NASDAQ 100, or a handful of tickers you already follow.
- Add a Candlestick block as the trigger and set it to Hammer.
- Add an RSI block as confirmation, set below 30.
- Set the target and stop, then work out the break-even win rate before you run anything: stop ÷ (target + stop). Write the number down.
- Run the backtest and compare the win rate it reports against the number you wrote down. That comparison is the result — not the profit figure.
Backtests run bar by bar against real historical data, using the same evaluation code as the live scanner, so a strategy that tests well behaves the same way when you switch alerts on.
Two caveats that apply to every backtest here
Survivorship bias. The test uses index membership as it stands today. Companies removed from the S&P 500 during the period are not included, and removals skew toward poor performers, so real-world results would likely be worse than shown.
Frictionless fills. Trades are assumed to fill at exactly the target or stop price, with no slippage and no commissions. Both push results upward.
Both caveats push in the same direction, which is worth sitting with: this strategy lost 32.7% under assumptions that flattered it.