China’s stock market is suffering because of a trade spat with the United States.

The Shanghai Composite Index has plunged more than 20% so far this year and is nearly 30% below its 52-week high.

But major Chinese tech companies may be getting unfairly punished by investors.

China’s tech giants generate a big chunk of their sales and profits from Chinese consumers and companies, and aren’t impacted by tariffs in the same way as Chinese financial and industrial companies.

Tina Byles Williams, the CEO and chief investment officer of asset management firm FIS Group, said pullbacks in Alibaba (BABA), Baidu (BIDU), Tencent (TCEHY) and Sunny Optical (SNPTF), a maker of camera lenses used by major Chinese smartphone makers Huawei, Xiaomi, Oppo and Vivo, are a bit excessive.

China will see some challenges but we do think the extreme level of selling is probably overdone, Williams told CNN Business.

Byles thinks Chinese healthcare companies are also being unfairly punished for much the same reason: They focus on Chinese consumers.

She dubs the tech and healthcare companies "New China" stocks.

Still, Williams said investors probably should stick to China ETFs as opposed to individual stocks in order to minimize risks.