After eight years as a public company, Tesla still has teething problems

Electric car maker Tesla Inc. is celebrating its eighth anniversary as a public company Friday, and investors who got in at the start and held on to their stock are enjoying some nice gains.

Since the stock TSLA, -0.73% closed at $23.89, or 41% above its initial public offering price, in its public debut on June 29, 2010, it has rocketed by a factor of nearly 15.

That would translate to hefty gains for Chief Executive Elon Musk, if he had held on to his initial stake in the company. Musk disclosed in an initial SEC filing ownership of 28.4 million shares, or 29.1% of the shares outstanding, as of Feb.

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