What Happens After a Stock Makes a New All-Time High?

"Don't buy all-time highs" is one of the most common pieces of advice in trading. It sounds intuitive. If a stock just hit its highest price ever, it must be due for a pullback. The smart move is to wait for a dip.

But is that actually true? We built the All-Time High Backtester to answer that question with data instead of intuition. Pick any ticker, set your risk parameters, and see what really happens after a stock prints a new all-time high.

How It Works

The tool scans the ticker's full price history and flags every day that a new all-time high was set. Each ATH event triggers an independent trade entry. You set the exit rules, and the tool shows you what happened across every single occurrence.

Two Entry Triggers

ATH on Close — Enter when the daily closing price prints a new all-time high. This is the conservative trigger. The stock has to actually close at its highest level ever, not just touch it intraday.

ATH on Touch — Enter when the intraday high reaches a new all-time high, even if the close pulls back. This captures every ATH event including those that reverse by the end of the day.

Exit Rules

Every trade exits on a profit target (% gain from entry) or a stop loss (% loss from entry), whichever hits first on any daily close. Configurable from 5% to 50%. No time-based exit, no second indicator. Just the exit discipline you'd actually use.

Every ATH Is a Separate Trade

This is important. The tool doesn't wait for one trade to close before starting the next. If SPY prints a new ATH 20 days in a row, that's 20 independent trade entries, each with its own profit target and stop loss running forward. The per-trade stats (win rate, average return, best/worst) reflect the full picture of what happens after any ATH event.

The equity curve uses a realistic single-position model for the headline annualized return, so the strategy vs Buy & Hold comparison stays grounded. But the trade count and per-trade statistics come from every ATH event in history.

Find Best Combination for ATH

Once you've picked your entry trigger (close or touch), click Find Best Combination for ATH. The tool sweeps every integer combination from 5% to 50% for both the profit target and the stop loss — 2,116 combinations — and returns the pair that produced the highest historical annualized return.

This tells you: given that this stock just hit an ATH, what's the historically optimal way to manage the trade? How tight should the stop be? How much room should you give it to run?

What You See

Annualized Return vs Buy & Hold

Your strategy's CAGR compared to simply holding the ticker over the same period. The "vs Buy & Hold" card shows whether buying only at ATHs with disciplined exits beat a passive approach.

Per-Trade Stats

Win rate across every ATH event, average trade return, average days in trade, best and worst single trade. For SPY with default settings (PT 10%, SL 5%), you'll see hundreds of trades spanning decades of data.

Trade Log

Every ATH entry and its outcome, sorted by date. Open and closed trades are interleaved chronologically. You can see exactly which ATH entries survived corrections and which got stopped out.

What the Data Shows

The answer to "should you buy all-time highs?" depends entirely on the ticker and the exit rules. For broad indices like SPY and QQQ, ATH entries with reasonable stops have historically been profitable more often than not. For individual stocks, the results vary widely.

The tool doesn't tell you what to do. It tells you what happened, every time, across the full history. Your job is to decide whether that distribution of outcomes matches your risk tolerance.