Here’s what’s been happening on Wall Street overnight

Gary Cohn (right). Picture: Getty Images,

Welcome to Finance Insider, Business Insider’s summary of the top stories of the past 24 hours. Sign up here to get the best of Business Insider delivered direct to your inbox.

Seth Golden, a former Target manager, rose to fame in financial circles following reports that he’d made millions shorting volatility.

When the stock market went haywire in early February, sending the Cboe Volatility Index surging, many Business Insider readers wondered how Golden had fared.

He wants to let everyone know that he emerged from the market blowup largely unscathed, and he has provided an explanation of how that’s possible. Here’s our story.

Elsewhere in trading news, $US35 billion hedge fund Millennium Management has hired a top trader from Citigroup.

In deal news, Cigna is buying Express Scripts in a $US67 billion deal. Express Scripts is one of the three massive PBMs that help negotiate lower prices for prescription drugs in the form of rebates on behalf of health plans. It was the only major PBM to stand on its own, and its stock has been weathering news that Amazon is interested in getting into healthcare.

The deal shows how the healthcare business is being redrawn. The banks that worked on the deal are expected to earn as much as $US200 million.

In other deal news, here’s the story behind S&P Global’s $US550 million deal to buy hot Wall Street AI startup Kensho.

Lastly, in trade news:

Business Insider Emails & Alerts

Site highlights each day to your inbox.

Follow Business Insider Australia on Facebook, Twitter, LinkedIn, and Instagram.