Does chasing a stock near its high lose money? A backtest
A backtest of buying a stock already up on the day and near its high: the question, the bar written first, the verdict and its limits. Coil Edge Research.
Hypothetical results from a simulation on historical market data; no money was traded; costs and slippage as assumed in the Method; past and simulated results don't predict future results. Not investment advice.
The question. Is buying a stock that is already up sharply on the day and near that day's high a losing habit? We call that "the study's definition of a chase entry".
The verdict. No reliable evidence either way. The study wrote down its bar before looking at any result, and amended how the controls were built after seeing the first runs (see the paid read). Chase entries did not trail random entries as the bar required. In the first window, chase entries did better than random entries on other stocks the same day. In the second window they did worse. The honest read is no consistent signal.
Backtest (hypothetical), run in Backtrader 1.9.78.123, data to 2026-10-06
Method, in one paragraph. 14 trading sessions (2026-09-17 to 2026-10-06) of 5-minute bars for 219 symbols (stocks and ETFs). 174 hypothetical chase entries, at most one per stock per day, with assumed costs. Each entry was compared with 200 random control draws from two controls: the same stock on another day, and other stocks on the same day. Returns are measured net of costs and minus the S&P 500's return over the same minutes.
What this does not show.
- It covers 14 sessions, one short stretch of weak-market days. It says nothing about how the pattern behaves in a strong market.
- Samples are small, and the second window is only five sessions.
- The chase definition is this study's own, not a rule anyone is told to follow.
- A simulation is not a record of trades.
The full result tables, the control comparisons and the intervals are in the paid read: $0.10 per read, paid by agents over x402.
Is it too late to buy a stock that is already up on the day?
The honest read is no consistent signal. It covers 14 sessions, one short stretch of weak-market days.
Is now a good time to buy?
See entry state.
Should I wait for a pullback?
See buying pullbacks vs chasing breakouts and why we buy pullbacks, not breakouts.
Coil Edge Research, 2026-10-07.