Should FFIV Stock's New High Stop You From Buying?

Investors are often warned to buy low and avoid purchasing at the top. F5 (FFIV) stock closed at a 52-week high of $479.83 on October 9, 2026. By traditional logic, this is the wrong time to buy. Rather than debate the current share price, historical trading data reveals what happened to investors who bought F5 at its previous highs. Does the rule hold for F5 stock.