A big green candle at the bottom of a slide? Give it one more week.
A big green candle that swallows the prior red one after months of decline — entered at that week's close, it slipped in the first week; only after the low held a week and a lower-wick green candle printed did large caps reach market level. Counted across 8,346 symbols of past weekly bars.
A stock has been falling for months. Then, one week, a big green candle shows up and swallows the previous week's red candle whole. Anyone who reads charts knows the feeling: *is this the bottom?*
This piece finds that exact spot on weekly candles (one candle per week), then counts what actually happened over the next six weeks. It answers a single question: when was the better moment to look?
At a fresh low after a long slide, a green candle swallows the prior red body on the close
The close matters more than the open
The textbook bullish engulfing is strict: it has to open below the prior close and finish above the prior open. Traders in practice are looser. If a candle opens somewhere inside the prior body but closes above the prior open, most people still call it engulfing.
This piece uses that looser definition, but it is strict about location. Only candles that appear at a fresh low after months of decline were counted. An engulfing candle after a few soft days is just an ordinary bounce, and those were left out.
Bought at that week's close, the setups slipped the following week
We re-scanned twelve years of weekly candles across 8,346 stocks and coins in the US, Korea and crypto. Each setup was treated as bought at the close of the week it appeared, then tracked for thirty sessions. The yardstick was buying any symbol on any random day — roughly half of those are higher a month later.
The result was modest. The first week leaned down more often than up. The excitement of that big green week tends to cool early the following week. A month out, the setups were no better than a random day.
Splitting by company size changes the picture a little. Large caps alone were at or slightly above market level a month later. Mid caps, small caps and altcoins all trailed the market.
By market and by size
Each cell is the median return thirty sessions later, with the share of setups that were higher in parentheses. Size is split three ways by that year's traded value rather than market cap (large, mid, small). Crypto has only about a hundred signals per row — read those rows for direction only.
| Market | Size | Signals | Bought at that week's close | Lower-wick green candle a week later |
|---|---|---|---|---|
| US | Large | 5,422 | +1.5% (54%) | +2.0% (56%) |
| US | Mid | 5,395 | 0.0% (50%) | +0.1% (50%) |
| US | Small | 4,978 | −2.9% (41%) | −2.9% (41%) |
| Korea | Large | 3,155 | +0.4% (51%) | +0.1% (50%) |
| Korea | Mid | 3,529 | −1.4% (45%) | −1.9% (44%) |
| Korea | Small | 3,026 | −1.6% (43%) | −1.4% (44%) |
| Crypto | Large | 114 | −0.8% (50%) | +5.1% (58%) |
| Crypto | Mid | 89 | −3.9% (46%) | +6.4% (58%) |
| Crypto | Small | 102 | −11.4% (31%) | −11.1% (36%) |
The way to read it is simple: only the positive rows are places where this shape earns its keep. US and Korean large caps are those rows; small caps were negative in every market. Large and mid-cap crypto look good after waiting for the lower-wick candle, but with a few dozen signals each, a reversal next year would be no surprise.
Waiting a week for a lower-wick green candle worked better
So we moved the buy day. Within five sessions after the engulfing week, the first day that closes green with a lower wick — bought at that day's close. If the two-candle low broke in the meantime, the setup was skipped.
First lower-wick green candle in the week after a weekly Downtrend Engulfing
In US large caps, that spot cleared the first-week dip entirely, and more than half of those setups were higher a month later. Six out of ten engulfing signals produced this candle within the week, and fewer than one in ten lost the low while waiting.
It was the holding, not the candle shape, that did the work
The easiest way to fool yourself with a good-looking number is to credit the wrong cause. There was an obvious suspect here. A signal that produced a lower-wick green candle is, by definition, a signal whose low held for a week — and that alone could explain the improvement.
So, on those same signals, we counted two more variations: buying at the weekly close anyway, and buying three days later without looking at candles at all. Neither was meaningfully different from the lower-wick entry.
The candle's real job, then, is confirmation, not timing. It shows you that the low survived a week. That confirmation was worth having in large caps; below that, even the confirmation added little.
It also flips from year to year
This shape shows up across many stocks at once whenever the whole market is selling off. So each year's result tracked almost exactly whether the market turned at that point: big wins in years the market bottomed, big misses in years the slide kept going.
Treat it less as a signal about one stock and more as a bet that the market turns here.
So: big green candle at the bottom? Give it a week.
One sentence to take away: a big green candle at the bottom of a long slide isn't a place to act on that week's close; give the low one more week to hold first. When a green candle with a lower wick prints, that's the spot. If it never comes, or the low breaks first, let it go.
And keep one number in view — the low of the two engulfing candles. Below it the setup is void, and in the record that level broke within a month in four out of ten cases. Knowing exactly where you'd be wrong before you start is the real use of this pattern.