Rightmove shares didn't stay up to expectation, with recent results weakening with the housing market.
Though the online property portal saw its profit soar by 12 percent over the first half of the year to £98.2million, shares slipped by 3.1 percent, or 158p, to 4934p.
Rightmove said it had 1.2million properties advertised on its portal, significantly more than any other, while house-hunters spent a total of 1.1billion minutes per month on the website.
Jefferies analyst Anthony Codling said the results 'defy gravity again', at a time when estate agents are facing challenging markets and tightening their belts.
But Hargreaves Lansdown's Nicholas Hyett warned the company needed to beware of placing too much pressure on the estate agents it relies on.
All adverts on Rightmove's site have to come from an agency, rather than individuals. Rightmove charges those agents on a per-office basis, so Hyett pointed out that office closures could be a particular concern.
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.'
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