What it means
Prices fall for two different reasons that look identical on the day: genuine bad news that lowers what the asset is worth, and forced or panicked selling that pushes the price temporarily below that worth. Buying a bounce is a bet on the second.
The trader is not claiming the business has improved, only that the selling has gone too far for now. The commercial logic is mean reversion over short horizons.
After a violent decline, sellers run out, short sellers take profits and buyers who liked the asset at a higher price step in, which often produces a partial recovery. That recovery has little to do with fundamentals and a great deal to do with the balance of orders.
In practice the trade needs three decisions made before entry: the entry level, the price at which the idea is proved wrong, and the target. Without a stop loss, buying a bounce becomes the most expensive habit in investing, because the trades that go wrong are the ones that fall furthest.
Professionals size the position from the stop distance rather than from how strongly they feel. The important distinction is between buying a bounce and value investing.
A value investor buys because the price sits below intrinsic worth and is content to wait years, whereas a bounce trader buys because the price sits below its own recent range and expects to be out within days or weeks. Confusing the two is how a short term trade quietly becomes a long term holding nobody wants.
The common warning is the phrase about catching a falling knife, which describes buying into a decline that simply keeps going. Treat any asset falling on a solvency problem, a fraud investigation or a lost regulatory approval as off limits for a bounce, because those declines tend to continue.
In practice
Real-world examples.
Example
An airline's shares drop 22% in a week after a strike announcement that is then settled four days later. A trader who bought the bounce near the low exits into the recovery for an 11% gain, having risked 4% on the position. The fundamental view of the airline never entered the decision at all.
Example
An exchange traded fund tracking a broad index falls 9% in two days on a macroeconomic scare, with no change to company earnings. A systematic fund adds a measured position because the decline is index wide rather than company specific, then closes it when the index recovers half the drop.
Example
A mining company's shares halve after a tailings dam failure. A trader is tempted to buy the bounce, then declines because the loss is a legal and regulatory event with no known ceiling. The shares fall a further 38% over the following month.
Formula
Calculation
The arithmetic is risk against reward: Reward to Risk = (Target Price - Entry Price) / (Entry Price - Stop Price), and Position Size = Risk Budget / (Entry Price - Stop Price).
A share falls from $60 to $36 in three sessions after a profit warning. A trader buys at $36, sets a stop at $33 and a target of $44, which is roughly where the share traded before the final leg down. Reward to risk = ($44 - $36) / ($36 - $33) = $8 / $3 = 2.67 to 1, so the break even win rate is $3 / ($3 + $8) = 27%. With a $250,000 account and a 1% risk budget of $2,500, position size = $2,500 / $3 = 833 shares, rounded down to 800 shares costing 800 x $36 = $28,800 and risking 800 x $3 = $2,400.Case study
Seen in the real world.
Northbeam Capital is an illustrative, fictional two person trading firm used here to show how the discipline works. Its rule was deliberately narrow: buy a bounce only after a fall of at least 15% in five sessions, only where the cause was known and quantified, and never where solvency or fraud was in question.
Over one illustrative year it took 40 such trades. Twenty three were winners averaging $9,200 and seventeen were losers averaging $4,100, producing 23 x $9,200 = $211,600 of gains against 17 x $4,100 = $69,700 of losses, a net $141,900 before costs.
The year's single largest loss was $5,600, because position size came from the stop distance rather than from how strongly either partner felt about the trade. That constraint, rather than the hit rate of about 58%, is what made the strategy survivable.
Watch out
Common mistakes.
- Buying a bounce without a stop loss, which converts a defined short term trade into an open ended loss you never agreed to take.
- Judging how far a share has fallen from its all time high rather than from a sensible estimate of value, so a 60% fall still looks cheap when it is not.
- Letting a failed bounce trade become a long term investment by inventing a fundamental reason to keep holding it.
Questions
People also ask.
Is buying a bounce the same as buying the dip?
They overlap, but buying the dip usually means adding to a long term holding on weakness, while buying a bounce is a short term trade with a planned exit.
How do I tell a bounce from a continuing fall?
You cannot tell reliably in advance, which is the whole reason the trade is sized and stopped rather than argued about.
What size should a bounce position be?
Work backwards from the loss you will accept, so if you will risk $2,000 and your stop is $4 below entry, the position is 500 shares and no larger.
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