Activist investor Starboard Value LP pushed Friday for Yahoo Inc. to explore a possible combination with AOL Inc. and encouraged the Internet pioneer to slow its acquisition strategy.

Starboard, which says it has a significant stake in the company, said a potential deal with AOL could improve Yahoo's competitive position and deliver cost synergies of up to $1 billion.

Representatives from Yahoo and AOL weren't immediately available for comment. Starboard's exact position wasn't disclosed, but taking a position of at least 5% would have forced the firm to make a regulatory disclosure.

Yahoo and AOL have explored a possible deal in the past, The Wall Street Journal has reported. Analysts have said a Yahoo-AOL merger could create a strong competitor in the market for online display ads, which include video, banner and interactive ads.

One potential obstacle to a deal was thought to be the complexity of spinning off Yahoo's Asian assets.

But Starboard suggested Yahoo should unlock the substantial value from Yahoo's 15% stake in Alibaba and its 36% stake in Yahoo Japan.

"These two minority equity interests are worth approximately $11 billion, or $11 per share more than the current enterprise value of" Yahoo, Starboard said in its letter.

Confidence in Yahoo has waned since Alibaba Group Holding Inc. went public earlier this month and the Internet company sold a big portion of its stake. That sale exposed Yahoo and its Chief Executive Marissa Mayer to more scrutiny about the eroding value of its core online advertising business.

Starboard has been an AOL shareholder in the past and mounted an unsuccessful proxy fight in 2012 to win several seats on the company's board. At the time, the firm criticized CEO Tim Armstrong's strategy of investing heavily in online content, specifically the company's Patch local news unit. Earlier this year, AOL sold most of the Patch network to an investment firm specializing in turnaround situations.

Meanwhile, Starboard also criticized Yahoo's acquisition strategy, saying it has led to $1.3 billion in capital spending since the second quarter of 2012. During that time, revenue has remained stagnant and adjusted earnings have materially decreased, the investor said.

Starboard is also in the middle of a drawn-out proxy fight with Darden Restaurants Inc. and on Thursday won the support of two influential proxy-advisory firms in its bid to unseat the restaurant operator's 12-person board.

Write to Lauren Pollock at lauren.pollock@wsj.com

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