By Douglas MacMillan And Lauren Pollock 

Yahoo Inc. unveiled plans for a tax-free spinoff of its remaining stake in Chinese e-commerce giant Alibaba Group Holding Ltd., heeding calls from some shareholders and activist Starboard Value LP.

Shares rose more than 7% in after-hours trading.

Investors have been eager to hear Yahoo's plans to extract value from its lucrative Asian assets while avoiding a tax bill of billions of dollars. The company sold shares in Alibaba's initial public offering but still owned a 15% stake of the Chinese e-commerce giant.

The new company Yahoo unveiled Tuesday will own all of Yahoo's remaining shares of Alibaba, which are valued at $40 billion, and will assume no debt in the deal.

Yahoo, meanwhile, will hold on to its core business and its 35.5% interest in Yahoo Japan, which is worth about $2.3 billion.

Together, the Alibaba and Yahoo Japan stakes make up the vast majority of Yahoo's current market capitalization of about $46 billion.

The spinoff plans came as the Internet company also reported declines in fourth-quarter earnings and revenue.

Tuesday's plans could help determine whether embattled Chief Executive Marissa Mayer buys herself more time with shareholders or invites a bitter proxy battle that could threaten her job.

Starboard had pressured Yahoo to minimize those taxes, calling for the company to essentially break itself into two distinct parts, one for its core business of Internet properties and the other for its holdings in Alibaba and Yahoo Japan.

Write to Douglas MacMillan at douglas.macmillan@wsj.com and Lauren Pollock at lauren.pollock@wsj.com

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