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Martin Shkreli Is Removed as C.E.O. From Another Company, KaloBios

KaloBios Pharmaceuticals is a California biotechnology company that Mr. Shkreli gained control of in November.

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For Market Debut, Square Scales Back Valuation by $3 Billion

The price of $9 a share is below the marketed range, a sign that the party for Silicon Valley may be soon coming to an end.

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Square, Facing a Chilly Market, Persists in Pursuing I.P.O.

The payments provider said it would sell shares at $11 to $13 apiece, a valuation of up to $4.2 billion — much lower than its private valuation.

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An Uber I.P.O. Looms, and Suddenly Bankers Are Using Uber. Coincidence?

JPMorgan Chase became the latest bank to publicize its use of the Uber ride-hailing service, as Wall Street jockeys for favor ahead of an initial public offering.

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Daily Report: Big Challenges Ahead for Twitter’s Next Chief

Twitter’s next leader has to be comfortable operating under the scrutiny of a board that includes all three previous chief executives of the company, each of whom was removed from the job before he really wanted to go.

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Twitter Shares Plunge on Pre-emptive Post

Selerity, a financial analytics firm, tweeted what looked to be an early release of Twitter’s disappointing earnings release, before Twitter released it.

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Daily Report: Twitter’s New Features, and Old Problem

With a slew of new features, the company understands that it needs to do more to help people get value from the service, which is at its best when it is reflecting what its users are obsessing about at any given moment.

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S.E.C. Accuses Financier Lynn Tilton of Defrauding Investors

Regulators said Ms. Tilton and her firm breached their fiduciary duty to clients by failing to value properly the assets of distressed firms.

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