• It lost more than $500 million last year, and its explosive user growth appears to have hit a speed bump.

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Investors, attracted by Snapchat’s hold on its millennial users — who check the app on average more than 18 times a day — flocked to the initial public offering, pushing the parent company, Snap Inc., to a valuation of nearly $24 billion.

The stock sale sets Snap up as the most valuable American technology company to go public since Facebook nearly five years ago. And it may herald a coming wave of unicorns — technology start-ups valued at more than $1 billion by private investors — that are expected to hit the public markets in the next few years.

Snap’s offering was priced on Wednesday at $17 a share — a dollar more than the previously expected pricing range. The pricing came on a day when the stock market surged to another high, fed by raised expectations of tax cuts, looser regulations and higher interest rates under the Trump administration. Shares of the social media companies Facebook and Twitter also rose.

Those buying into Snap’s offering did so even as warning signs have flashed over the company, based in California. It lost more than $500 million last year, and its explosive user growth appears to have hit a speed bump. And in a decision that has angered some large investors, the shares will have no voting rights, leaving control in the hands of the company’s founders, who can retain that power for years even after leaving Snap.

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