The short sellers have good reason to think they will be rewarded.
In April, Tesla saw a massive drop in sales of its electric vehicles in Hong Kong after Chinese officials slashed a tax credit that made it significantly cheaper to buy the company's cars. Without the tax break, the price of a Model S four-door sedan rose almost 60%, jumping to $130,000 from $75,000.
Tesla didn't sell a single car in Hong Kong in April after the tax cut was reduced, according to The Wall Street Journal. By comparison, there were 2,939 Tesla vehicles registered in Hong Kong in March.
The sales dip highlights just how reliant the company's business may be on tax credits. In securities filings, Tesla has warned investors that changes to incentive programs "could have some impact on demand for our products and services." And Hong Kong isn't the first place where it has felt the impact of reduced tax credits. Last year, Denmark began requiring electric car dealers to pay a 180% import tax on vehicles, which caused new electric vehicle registrations to fall 70% in 2016.
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The company doesn't disclose vehicle sales by country or region, but analysts say that it's a small portion of Tesla's overall business, accounting for nearly 6% of global sales of Model S sedans, Bloomberg noted. A Tesla spokesperson said the company welcomes government policies that make it easier for people to buy electric vehicles, but that its business doesn't rely on it, citing that it tripled its revenue in China between 2015 and 2016, "despite a massive tariff and no incentives."