Waiting for a stock market crash? This FTSE 100 superstar just fell 20% in a day

Aug 10, 2026
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With the FTSE 100 sitting near record highs and growing chatter about a potential crash, some investors have simply parked their cash on the sidelines, waiting for disaster to strike before putting money to work.

However, history suggests this is often a losing strategy, especially since there’s no guarantee a crash will actually arrive anytime soon.

That’s why shrewd investors rarely hang around. They’re constantly hunting for opportunities. And having just collapsed by 20% in a single day, Rentokil Initial (LSE:RTO) is now firmly in the crosshairs of opportunistic value investors.

So what actually happened, and is this a genuine buying opportunity?

The sharp drop in Rentokil shares came following its latest half-year results. Yet on the surface, the numbers were hardly disastrous, posting $3.59bn revenue (up 6.7%) and an 8.8% boost in adjusted operating profit to $556m.

So why was the reaction from investors so brutal? The real trigger was buried deeper in the report. Management quietly retired its target of reaching a 20% operating margin in North America by 2027, choosing instead to reinvest cost savings back into driving volume growth rather than banking the margin gains investors had been expecting.

The move was interpreted by investors as a longer-term profit warning. Layer on weakening Residential lead flow late in the quarter and slower commercial growth from National Accounts, and it’s easy to see why the market punished the stock so severely.

But is the story actually broken? Or is the market simply overreacting?

Why this could still be an opportunity

Rentokil operates in pest control, a defensively resilient, non-cyclical industry that’s grown at a steady 6.6% annual pace globally over the past decade. And looking ahead, it seems most analysts agree this steady upward trajectory is set to continue, with forecasts pointing to similar growth rates until at least 2034.

When it comes to taking advantage of this trend, new CEO Mike Duffy has been fairly candid. He’s flagged the group’s historical underperformance while also laying out a clear turnaround plan focused on customer retention, operational standardisation, and business simplification.

While he’s only four months into the role, the early signs of progress are there. Free cash flow conversion now stands at 96% with the group’s net debt-to-EBITDA ratio sitting comfortably within the company’s target range for the first time since 2022.

In other words, the recent sell-off might be nothing more than a temporary reset of expectations as the chief exec makes his mark.

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