Both Rightmove and Zoopla endured a bad day on the stock market yesterday.

Rightmove’s shares slumped 67p to finish the day at 2250p, a fall of almost 3%.

That actually represented something of a recovery as they had plummeted to 2190p earlier in the day.

Zoopla’s shares went down by 5.5p to end at 240p, a fall of 2.24%.

The falls happened after broker Citigroup said that investors may have under-estimated the potential disruption from Agent’s Mutual “which aims to damage incumbents by fragmenting the market”.

Citigroup downgraded Rightmove from “buy” to “sell” and was also cautious on Zoopla.

The broker also said that while the UK’s property market is in good health, it is “not clear that the online classifieds model will see a direct benefit from greater transaction volumes” because their revenues are largely subscription-based.

Conversely, Citigroup said that traditional print media would gain from increased transactions, and upgraded both Johnston Press and Trinity Mirror. Their share prices barely moved – by 0.06p and 1p respectively – but at least they did so in an upwards direction.

A comment in last night’s London Evening Standard said that the City had given “puffy” valuations of both Rightmove and Zoopla.