Following a downturn in the profitable US market and ongoing difficulty in China, Porsche AG issued a warning that sales would be difficult this year.
After a more severe drop in the first quarter, the sports car manufacturer's worldwide deliveries decreased by six percent in the first half of the year.
After a 37 percent spike in the three months leading up to March, growth fell to 10 percent in North America, where Porsche is entirely dependent on imports.
China's auto sales increased in June for the fifth consecutive month, but there were concerns about escalating competition in the largest auto market in the world after some major electric vehicle manufacturers reported weakening demand.
June had an 18.6 percent year-over-year increase in sales to 2.1 million automobiles, up 13.9 percent from May.
According to data by the China Passenger Car Association (CPCA), sales of 11.1 million vehicles were up 11.2 percent in the first half.
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Sales of EVs and plug-in hybrids, which account for 52.7 percent of all automobile sales, rose a significant 29.7 percent in June compared to a year earlier, from 28.2 percent in May.
In China, where indigenous brands are gaining traction, European luxury automobile manufacturers are lagging behind and losing ground in the US.
Mercedes-Benz Group AG reported a 10 percent decline in sales during the second quarter as a result of US and Chinese deliveries being restricted by President Donald Trump's tariffs.
Due to its lack of a US factory, Porsche is among the manufacturers most vulnerable to the taxes.
The Volkswagen AG-controlled company discussed its performance in China, pointing to intense rivalry in the luxury and electric vehicle markets, which are becoming more and more dominated by domestic producers under the leadership of BYD Co.
The gradual release of upgraded models caused a nine percent decline in 911 sales worldwide. With sales up 15 percent in the first half, the Macan sport utility vehicle was the brand's best-selling model; over 60 percent of those sales were of the all-electric model.