Square IPO is warning to tech 'unicorns' (Update)

Mobile payments startup Square said Friday it will raise up to $403 million in its stock offering—but it may be valued less on Wall Street than by private investors.

Square files for keenly awaited stock market debut

Digital payments startup Square, founded by Twitter chief Jack Dorsey, announced Wednesday that it has filed with US regulators for a stock market offering to raise $275 million.

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