Luxury car dealer HR Owen issued a profit warning on Monday, blaming a fall in demand and delays in the delivery of new models for denting its hopes of a strong second half.
The company said that demand had "deteriorated in recent weeks" and it now expected to "record a small loss at trading level for the second half of the year".
The shares fell 3½ - 5pc - to 64p.
HR Owen forecast in March that 2011 would bring "a higher level of full-year profits than has been historically seen", fuelled by the expected delivery of more new car models in the traditionally-quieter second half.
On Monday it said that "the supply of certain important new model cars, for which customer orders have been received, has been adversely affected and will impact the final quarter of 2011".
HR Owen said 2011 profit would be more in line with 2010, when its pre-tax profits, excluding exceptional items, were £1.5m.
It declined to say which cars had not been delivered in line with its expectations.
The Telegraph understands that HR Owen expects to receive at least six Lamborghini Aventador cars by the end of the year, with a profit margin of more than £30,000 each, and has total orders for 60 of the cars.
Its website says the first customers will take delivery of the car by "late summer".
It is understood the first global customer shipments of Aventadors left Lamborghini in October.
Lamborghini said it had delivered on time and in line with its own expectations.
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