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Lyft’s stock market debut has set up its founders, employees, early backers and even those who scored shares in the initial public offering Thursday night for quite a windfall.

But not everyone who invested in the company is reaping the spoils.

Shares of the ride-hailing company rose nearly 9 percent on Friday. At over $26 billion, Lyft’s market value is almost double what private investors valued it at less than a year ago.

But Lyft’s first-day gain is measured off the I.P.O. price (which was set on Thursday, when shares were divided up mostly among large funds). Ordinary investors who wanted in had to wait to buy the stock until it was available on public markets on Friday, and at a much higher price than the big funds paid.