Japanese flea market app startup Mercari, which raised $1.2B in its IPO, closes up 77% in its debut on the Tokyo stock exchange, valuing it at as much as $7.4B (Sam Nussey/Reuters)

Sam Nussey / Reuters: Japanese flea market app startup Mercari, which raised $ 1.2B in its IPO, closes up 77% in its debut on the

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Sources: Fidelity has been working on a digital asset exchange for about a year; internal job posting also hints at plans for a cryptocurrency custody service (Frank Chaparro/Business Insider)

Frank Chaparro / Business Insider: Sources: Fidelity has been working on a digital asset exchange for about a year; internal job posting also hints at

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