After about ten minutes of trading on Friday, Nvidia's stock had fallen 2.0 percent.
In the past five trading days, a tenth of the company's market value has been wiped out - before Huang was fired on Thursday following the discovery of several infidelity deals within just a few days.
Nvidia is still the world's second-most valuable listed company, after Apple.
Nvidia's more direct competitors in chip manufacturing, Broadcom and AMD - which rose sharply as Nvidia fell - are down even more, by 4.1 and 4.9 percent respectively.
The stock market as a whole is moving relatively cautiously.
The Dow Jones Industrial Average has risen 0.2 percent, while the broad S&P 500 index is down 0.1 percent and the technology-heavy Nasdaq Composite Index 0.3 percent.
Microsoft - third on the global market capitalisation list - is also struggling on the stock market. The software giant is experiencing technical problems with its data services on Friday. The stock has fallen 0.8 percent.
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