By Douglas MacMillan 

Yahoo Inc. unveiled a plan to spin off tax-free its nearly $40 billion of holdings in Alibaba Group Holding Ltd., a move that should give Chief Executive Marissa Mayer more time with shareholders despite continued declines in the Internet portal's core advertising business.

Investors have been eager to hear Yahoo's plans to extract value from its Asian assets, which represent the vast majority of its $47 billion market value, while avoiding a tax bill of billions of dollars.

After the spinoff, expected in the fourth quarter of this year, Yahoo will continue to operate its core business and hold its 35.5% interest in Yahoo Japan.

The new company will own all of Yahoo's remaining shares of Alibaba, Yahoo said. It will assume no debt in the deal, and Yahoo will retain its cash. Once completed, the spinoff would let Yahoo shareholders cash out of Alibaba stock on their own, and also give the Chinese e-commerce giant the chance to buy the entire entity and thereby its own shares at a lower tax rate than if it tried to acquire them now.

In an interview, Chief Executive Marissa Mayer said she decided on a spinoff around last August, after considering dozens of alternative structures for unlocking value from the Alibaba shares. The process consumed almost her entire first two years at the company and required a small army of bankers and lawyers, she said.

"We homed in on the spinoff structure over the summer and we basically spent the fall really refining it," Ms. Mayer said. "There were a lot of variations on the way to do the spin, what was included in the spin, was it a reverse spin or a straightforward spin, which is what we ultimately chose."

A spokeswoman for Alibaba didn't immediately return a request for comment.

Investors applauded the news, sending Yahoo shares up 5.8% in after-hours trading. The plan saves Yahoo from paying billions of dollars in taxes and erases fears that Ms. Mayer would spend some or all of the value of the Alibaba stake on large acquisitions.

But a spinoff will put more investor focus on Yahoo's core ad business, which continues to shrink. Yahoo reported on Tuesday that revenue in the fourth quarter, minus commissions paid to search partners, declined 2% to $1.18 billion, falling short of analyst expectations and reversing the small increase in the third quarter. The company has been hampered by weakness in revenue from display ads, which has fallen eight of the past nine quarters.

Ms. Mayer failed to address all of the concerns raised last year by activist investor Starboard Value LP, which also called for cost-cutting measures and a potential tie-up with AOL Inc. That leaves open the possibility of a potential proxy fight.

Starboard also may take issue with Yahoo's decision to hold on to its Yahoo Japan stake, currently valued at about $7.2 billion. On a conference call with analysts, Yahoo Chief Financial Officer Ken Goldman said Yahoo is open to exploring opportunities for Yahoo Japan but stopped short of providing more details.

For AOL, Ms. Mayer said, "we don't see a particularly accretive contribution. I do think that we have some skepticism around the synergies that are being posited."

Starboard wasn't able to comment immediately on whether it is satisfied with the split--which is expected to close after the expiration of the one-year lockup agreement on Alibaba's IPO. Yahoo sold shares in Alibaba's initial public offering in September but still owns a 15% stake.

The spinoff plan gives Ms. Mayer "more ammunition in her battle against Starboard in terms of trying to win points with investors," said Eric Jackson, founder of Ironfire Capital LLC, an investor in Yahoo. "I don't think they will go away completely."

Bob Willens, an independent tax expert of corporate structures, lauded Yahoo's move on Tuesday, saying it was the most simple and effective move the company could have made. Mr. Willens said the spinoff enables an easy second step, in which Alibaba could buy the entity with its own shares in a stock-for-stock deal.

Such a deal could happen almost immediately after the spinoff is completed and avoid the tax bill, as long as Alibaba and Yahoo haven't negotiated or agreed on such a deal before the spinoff, Mr. Willens said.

On Tuesday, Yahoo reported its revenue from display ads, excluding traffic costs, dropped 5% to $464 million in the fourth quarter, the third straight quarterly decline.

While revenue from desktop display ads continues to shrink, Yahoo has attempted to offset those declines by investing in newer businesses like mobile, social, native ads and video. These businesses together contributed $1.1 billion in revenue and were the fastest-growing part of Yahoo, Ms. Mayer said on the call with analysts.

"If broken out on their own they would undoubtedly be one of the fastest growing startups in the world," Ms. Mayer said.

The CEO also said Yahoo would only consider larger acquisitions if they fall into one of these four areas.

The company, which reported revenue from mobile for the first time in the previous quarter, said mobile revenue in the fourth quarter grew 23% to $254 million. That represents about 20% of Yahoo's total revenue.

Yahoo hopes to accelerate those sales this year by offering the mobile ad network it acquired last year with its purchase of Flurry to all other advertisers. Prashant Fuloria, a former Flurry executive and veteran Internet product manager, was promoted to oversee all ad products at the company.

Yahoo overall sold 17% more display ads in the quarter, but suffered as the average price of those ads fell 20%.

Ms. Mayer said she is currently discussing Yahoo's current search partnership with Microsoft Corp. and pursuing a possible new partnership to become the default search provider on Apple Inc.'s Safari browser for iPhones and iPads. Search revenue, excluding traffic costs, was flat at $462 million. Paid clicks increased 10%, and price per click rose 7%.

In all, Yahoo's profit slipped to $166 million, or 17 cents a share, from $348 million, or 33 cents a share, a year earlier. Excluding items, the company's earnings fell to 30 cents a share, from 46 cents.

David Benoitand Lauren Pollockcontributed to this article.

Write to Douglas MacMillan at douglas.macmillan@wsj.com

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