Shares in Purplebricks tumbled over 7% yesterday, finishing at 375p, down 28.5p.

A long way down from their July high of 513p, it was not obvious what has spooked investors.

On Monday it issued a brief three-line trading update saying it was on track to perform in line with expectations.

On the same day, Old Mutual raised its stake in Purplebricks to hold a 12.59% interest – up from a stake of 11.1%.

Other estate agents did better on the stock market yesterday.

Countrywide shares yesterday edged up slightly to 128p, while LSL shares were also marginally up, and Foxtons were down slightly to 73.50p.