By Juro Osawa 

Alibaba Group Holding Ltd. fought back against Chinese government accusations that it permitted fake goods to be sold through its services, while posting financial results that showed the continued cost of pursuing mobile customers.

The Chinese e-commerce giant on Thursday said profit fell 28% from a year earlier for the quarter ended Dec. 31, a drop it largely attributed to expenses from giving shares to employees. But investors focused on its revenue growth, which--while sizable--disappointed analysts. Its shares fell about 10% in midday trading in New York.

In a conference call to discuss the results, Executive Vice Chairman Joseph Tsai also defended the company against accusations made by a powerful Chinese regulator, the State Administration for Industry and Commerce, that Alibaba's lax oversight over its sales platforms allowed sales of counterfeit goods, bribery and other illegal activity. The accusations, he said, were "so unfair."

SAIC couldn't be reached for comment on Mr. Tsai's assertions.

"We have been very vocal about protesting, and we're prepared to file a complaint," Mr. Tsai said. Alibaba has spent more than one billion yuan (about $160 million) for the past two years to fight fakes and protect consumers, he said.

The white paper that SAIC made public on Wednesday detailing its allegation disappeared from its website on Thursday, a move that Alibaba said it noted. It wasn't clear why the paper disappeared, and a SAIC press representative said she didn't know the reason.

The allegations were based on July discussions between SAIC officials and Alibaba executives. The white paper said SAIC officials had delayed the report so that it wouldn't affect Alibaba's September initial public offering in the U.S.

Mr. Tsai said Alibaba didn't see the white paper prepared by the regulator until it was posted on Wednesday, and that it considered the July meeting routine.

"I want to make it absolutely clear that Alibaba never requested the SAIC to delay the publication of any report," Mr. Tsai said.

Both the results and the scrutiny by Chinese regulators illustrate the challenges facing China's largest e-commerce company, which in September raised $25 billion in the U.S. in the world's largest initial public offering.

Alibaba dominates e-commerce in China and is often lauded as one of its biggest private-sector success stories.

Like China's other Internet companies, Alibaba is rushing to capture the increasing number of Chinese who use their mobile phones and other gizmos for everything from shopping to hailing taxis to transferring money.

Alibaba said mobile accounted for 42% of its total business on its Chinese retail platforms during the quarter, up from 36% in the quarter ended in September.

But it is still faces the challenge of generating revenue from transactions on Alibaba's mobile platforms, where advertising is less profitable than on personal computers.

In the quarter, the company's revenue from mobile services amounted to 1.96% of the overall transactions that took place through its mobile apps, higher than 1.87% in the previous quarter. But that was still lower than an estimate by brokerage CLSA of 2.5%. Morgan Stanley's analysts had expected the rate to rise to 2.25%.

Alibaba's revenue from PC websites amounted to 3.23% of total PC e-commerce transactions last quarter.

Chief Financial Officer Maggie Wu said Alibaba is developing mobile-specific ad formats and is working to improve search algorithms. "The long-term trend in mobile monetization is positive," she said.

Alibaba said revenue growth was also slowed by the addition of new personalization features to its "pay for performance" advertisements, in which sellers bid for keywords that match product listings on a cost-per-click basis at prices established through an online auction system. Ms. Wu said the company "just started this personalization effort and other efforts, so there will be some impact for the near term."

The company also said its profit margins were squeezed slightly by acquisitions and new initiatives, which include forays into everything from mobile maps and browsers to digital entertainment.

Ms. Wu said Alibaba would continue to invest in features and contents to draw more users to its platforms. "Please remember that we do not manage to a margin target," she said.

For the December quarter, Alibaba's earnings fell 28% to $964 million, or 37 cents a share. The company attributed much of the drop to $241 million in expenses related to share-based compensation to employees. It also booked a $134 million charge related to financing-related fees from early repayment of debt, and it faced rising tax expenses.

Excluding such items, per-share earnings rose 13% to 81 cents. Analysts, on average, were expecting earnings of 75 cents a share, according to Thomson Reuters.

The number of active users on Alibaba's mobile platforms rose to 265 million in December, up from 217 million in September and from 136 million a year earlier.

Earlier this week, Yahoo Inc. unveiled a plan to spin off tax-free its nearly $40 billion of holdings in Alibaba. The spinoff is seen giving the Chinese e-commerce giant the chance to buy its own shares at a lower tax rate than if it tried to acquire them now.

Alibaba said Thursday that it had $21.07 billion in cash as of Dec. 31.

Write to Juro Osawa at juro.osawa@wsj.com

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