Aston Martin has revealed sales have been weaker than expected.
The company, which joined the stock market last year, said economic uncertainty in the 海角视频 and Europe was keeping customers from buying its cars, although sales in the Americas were strong.
Investors piled out in response, sending shares down 242.8p, or 23.5 per cent, to 792.2p in early trading.
Bosses at the Warwickshire-headquartered now believe sales through the wholesale division will be between 6,300 to 6,500 vehicles, compared with previous predictions of 7,100 to 7,300.
Profit margin predictions have also been cut, with underlying figures now expected to be 20 per cent instead of 24 per cent and adjusted operating profit margins of just eight per cent versus 13 per cent previously guided.
Spending will also be cut from between £320 million and £340 million to £300 million.
Aston Martin's South Wales facility in St Athan is gearing up to go into full production next year and will undergo a large recruitment drive in the next few months.
The luxury car maker will start by making its first SUV, the DBX, at the Vale of Glamorgan factory, but will then add the manufacturing of Rapide E and Lagonda brands to the marque’s output at the site.
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It is expected that by 2021, when the two new vehicles will be in full production, there will be 1,000 workers at the factory. Initially it was thought the company would directly employ 750, with a likely further 3,000 across the supply chain and local businesses in Wales.
In a statement Aston Martin said: "DBX is on track with the new St Athan facility now commissioned and manufacturing the first preproduction cars.
"First orders will be taken at the Pebble Beach Concours d'Elegance, California, in August, with the global launch in December 2019 and start of production is Q2 2020, as planned."
The company said the challenging external environment highlighted in May had worsened as had macroeconomic uncertainties.
"We anticipate that this softness will continue for the remainder of the year and are planning prudently for 2020," the statement said.
Retail sales have improved - up 26 per cent in the first half of the year - with production for Aston Martin's first sports utility vehicle, the DBX, and its Valkyrie car on track.
In the 海角视频, wholesales fell to just 565 cars in the first half of the year, compared with 683 in the same period last year. This was exacerbated by a 22 per cent fall in the second quarter.
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Sales in America were up 54 per cent to 700 vehicles sold wholesale, but Europe, the Middle East and Africa was down 19 per cent to 490, versus 607 previously.
Chief executive Andy Palmer said: "We are disappointed that short-term wholesales have fallen short of our original expectations but we are committed to maintaining quality of sales and protecting our brand position first and foremost."
The company has struggled to win over the City since joining the stock market last year.
Shares were 1,900p in October when the company joined the stock market, making it one of the worst performing flotations of the last year.
There had also been heavy criticism over the price of the float after bosses revealed it cost £136 million to list the business.