SAN FRANCISCO — Yahoo Inc.’s chief executive, Jerry Yang, has gotten what he wanted: a chance to prove his company is worth more than the $47.5 billion that Microsoft Corp. offered to buy the Internet pioneer.

It will be a daunting challenge, as Yang will be pointedly reminded today when investors are expected to show how little they think of Yahoo without a takeover bid on the table. Faced with resistance from Yang and the rest of Yahoo’s board, Microsoft withdrew its offer over the weekend.

Many analysts believe Yahoo’s stock price, which had climbed nearly 50% since Microsoft’s initial offer, will surrender most, if not all, of that gain, leaving the Sunnyvale-based company’s market value around $30 billion.

Disillusioned shareholders are bound to question whether the rejection of Microsoft’s sweetened $33-per-share offer was driven more by emotion and ego than sound business sense.

“Clearly there’s frustration,” Darren Chervitz, a co-manager of the Jacob Internet Fund, which owns Yahoo stock, said. “I am not even sure if Yahoo cares about its shareholders because they didn’t show much regard for shareholders’ best interests in this process.”

Despite such negative sentiment, Yahoo shares are unlikely to immediately fall back to their $19.18 pre-bid price, partly because some investors may still be holding out hope that the software maker will renew its takeover attempt if Yahoo continues to struggle.

Yahoo shares finished last week at $28.67, slightly below the $29.40 per share that Microsoft was offering before Chief Executive Steve Ballmer agreed to raise the offer to $33 per share in a last-ditch effort to get a deal done.

Accompanied by his fellow Yahoo co-founder, David Filo, Mr. Yang flew to Seattle Saturday to inform Mr. Ballmer that the company wouldn’t sell for less than $37 per share — a price that Yahoo’s stock hasn’t reached since January 2006.

Analysts and investors were left to wonder why the two sides couldn’t compromise at $35 per share.

“They really didn’t seem that far apart,” Mr. Chervitz said. “There is probably blame to go around on both sides, but I think most of it is in Yang’s hands.”

Today’s anticipated shareholder backlash will put Mr. Yang on the hot seat as he tries to execute on a turnaround plan that he began drawing up nearly a year ago after he replaced Terry Semel as CEO amid shareholder angst about the company’s financial malaise.

“This squarely puts the pressure on Jerry Yang to deliver results and shareholder value,” Standard & Poor’s equity analyst, Scott Kessler, said. “You are going to see a lot of shareholders just throwing in the towel because they are going to realize it’s going to take awhile for the stock to get back to where it was Friday.”

Mr. Ballmer also will be under the gun to prove he can come up with another way to challenge Google Inc.’s dominance of the Internet’s lucrative search and advertising markets.

The unsolicited bid was widely seen as Mr. Ballmer’s admission that Microsoft needed Yahoo’s help to upgrade its unprofitable Internet division.

Analysts now expect Mr. Ballmer to use the money he had earmarked for the Yahoo acquisition to explore other possible deals with large Internet companies like Time Warner Inc.’s AOL and News Corp.’s MySpace and promising startups like Facebook Inc. and LinkedIn Corp. Microsoft already owns a 1.6% in Facebook, the second-largest social network behind MySpace.

But Mr. Ballmer is unlikely to be under as much duress as Mr. Yang because most analysts believe Microsoft’s stock price will rise today. The shares had declined 10% to $29.24 since Mr. Ballmer made the bid, reflecting concerns that the proposed marriage would turn into a complicated mess that would enable Google to grow even stronger.

Mr. Yang, 39, has promised that Yahoo’s development of a more sophisticated and far-flung Internet advertising platform will produce net revenue growth of at least 25% in 2009 and 2010. That would be a dramatic improvement, considering that Yahoo’s revenue rose by 12% last year and is expected to grow at about the same pace this year.

But analysts are skeptical about whether Yahoo will be able to hit those targets, raising the chances for a shareholder rebellion if the company stumbles during the next few months — a distinct possibility if advertisers curtail spending in a shaky U.S. economy, as many analysts fear.

As it is, Mr. Yang and the rest of Yahoo’s board almost certainly will face more lawsuits from incensed shareholders.

Even some of Yahoo’s own employees may be irritated because virtually all of them own stock options.

What’s more, Microsoft had planned to offer $1.5 billion in retention packages to the thousands of Yahoo employees it wanted to stay on after a takeover.

To help boost its short-term profits and its stock price, Yahoo is widely expected to form a long-term advertising partnership with Google. Although the final details are still being ironed out, Yahoo wants to hire Google to place some of the text-based ads that appear alongside the search results on its Web site. It’s a task that Google already handles for scores of Web sites, including AOL and Ask.com.