The Securities and Exchange Commission proposed sharply raising the size threshold of funds required to report their U.S. stockholdings quarterly, a move that would end such disclosures for nearly 90% of current filers, including many hedge funds and mutual-fund firms.

The proposal would mean investment managers with less than $3.5 billion in such holdings—including securities bought with leverage—no longer need to reveal the details of their portfolios. Those details include the number of shares held in a company and the...

Hedge-fund billionaire William Ackman has come roaring back after years of dwindling assets and a self-imposed exile from the spotlight.

But the famed activist investor’s recent wins haven’t been fueled by publicly agitating for companies to change. They have instead come from outside-the-box moves like the one that will be on display next week, when Mr. Ackman is expected to launch an initial public offering of the biggest blank-check company ever, raising money to take a future acquisition public.

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Uber Technologies Inc. is in discussions to buy Postmates Inc. for about $2.6 billion, according to people familiar with the matter, the latest in a rapid-fire series of moves to consolidate the food-delivery industry.

Should a deal come together, it could be announced next week if not sooner, one of the people said. But there is no guarantee it will.

Amazon has signed an agreement to acquire Zoox, a California-based company working to design autonomous ride-hailing vehicles from the ground up. Aicha Evans, Zoox CEO, and Jesse Levinson, Zoox co-founder and CTO, will continue to lead the team as they innovate and drive towards their mission.

Dell Technologies Inc. is examining options including a spinoff for its roughly $50 billion stake in VMWare Inc. as the PC maker seeks to boost the value of its shares.

Dell recently kicked off a process to explore the possibility of unloading the stake or taking other steps that could include buying the rest of VMWare, according to people familiar with the matter. The companies are working with advisers, these people said.

It’s...