Rightmove has been warned not to squeeze agents too hard.

City analyst Nicholas Hyett, of Hargreaves Lansdown, said that Rightmove needed to be wary of placing too much pressure on the agents it relies on for its revenue and profits.

On Friday, Rightmove announced record revenues and profits. Revenues for the six months to June stood at £131.1m, up 10% from the same period the year before, while pre-tax profits were £98.1m – a profit margin of 77% and up from £87.5m.

The rises were almost entirely driven by increased revenue from estate agents, whose spend was up by 10% to £99.3m.

But Hyett said that since Rightmove charges by branch, office closures could be a concern for the portal.

He said: “Rightmove simply is the UK property market. If you’re buying a property it’s the first place you go.

“It’s all very well arguing that estate agents have no choice but to pay, but if conditions don’t improve some will find they still can’t.

“Rightmove may have found the goose that lays the golden egg but it needs to make sure it doesn’t squeeze it too hard.”

Despite its ‘gravity defying’ results, the City seemed concerned: Rightmove was the worst FTSE performer on Friday, with shares falling 3.1%.

Rightmove shares ended up at just under £50 (4,934p).

On Friday, alongside its first-half results, it also announced a proposal to sub-divide its shares by ten so that, for example, shares would cost £5 rather than £50, making them more affordable for investors including its own staff.

A general meeting to vote on this will be held at Rightmove’s offices in Soho Square, London, on August 22.

Separately, another faller on Friday was Countrywide, whose shares dipped by 4.4% to finish at around 48p. The shares have been as low as 38p in recent weeks, with a high of around 56p on July 5.