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

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Mergers and acquisitions are back.

M&A bankers are set to split nearly $US330 million in fees from three megadeals announced over Sunday and Monday, according to consulting firm Freeman & Co.

These deals include a $US26 billion merger between telecom giants T-Mobile and Sprint; oil refiner Marathon’s acquisition of Andeavor for $US23 billion; and Wal-Mart’s sale of its UK grocery business Asda to Sainsbury for $US10 billion. Here’s the latest:

Elsewhere in deal news, investors are frustrated with Botox-maker Allergan – and its CEO says it’s “deep into the process” of figuring out what to do next.

WeWork has raised $US6.1 billion and pioneered the co-working movement – but it increasingly looks like it doesn’t understand commercial real estate. And DocuSign popped in its long-awaited IPO – now its CEO and CFO explain what’s next.

In related news, UBS has hired a top investment banker from Deutsche Bank amid a major ramp-up of its US dealmaking team.

In finance news, Morgan Stanley’s youngest bankers could be getting a 25% pay raise. And Goldman Sachs is battling to contain an outbreak of mumps on the trading floor. And a bunch of former KCG staffers have found a new home at Wall Street broker Instinet.

In markets news, Business Insider recently spoke with Tobias Levkovich, Citigroup’s chief US equity strategist, about what’s keeping investors complacent. You can read the full interview here. Elsewhere in markets news:

And in crypto news:

Lastly, Jeff Bezos reveals what it’s like to build an empire and become the richest man in the world – and why he’s willing to spend $US1 billion a year to fund the most important mission of his life.

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