By Anna Prior 

Chinese Internet giant Alibaba Group Holding Ltd., filed an updated prospectus on Monday for its planned initial public offering, revealing more details about its partnership structure and financials.

According to the filing, which had been expected, Alibaba said its partnership structure will have 27 members, including 22 members of management such as Chief Executive Jonathan Zhaoxi Lu, Executive Chairman Jack Ma, executive vice chairman Joseph Tsai, and chief operating officer Daniel Yong Zhang.

The partnership will have the exclusive right to nominate up to a simple majority of board members, according to the filing.

Alibaba also said the SoftBank and Yahoo have agreed to vote their shares in favor of Alibaba Partnership's nominees.

The board, which will consist of nine members--up from the four name in the pervious filing--will include Mssrs. Tsai, Ma, Lu and Zhang, as well as independent directors Chee Hwa Tung, Walter Teh Ming Kwauk, J. Michael Evans and Yahoo co-founder Jerry Yang. Jacqueline Reses, a board member since December 2012 and Yahoo chief development officer, will resign, according to the filing.

The company also provided more details about its operating results for its segments, saying that transaction volume on its Taobao site totaled CNY295 billion in the three months ended March 31, up from CNY223 billion a year earlier.

Meanwhile, transaction volume on its Tmall site totaled CNY135 billion for the latest quarter, versus CNY71 billion a year earlier.

The company didn't disclose what its principal shareholders are selling in the offering.

Alibaba, which plans to go public in the next few months, and its banks are responding to some complaints from investors that the company's initial IPO filing was too vague and didn't give them enough information to size up the company.

While companies are typically eager to keep investors happy, the stakes in this case are higher because the company's IPO could be the biggest ever. The sheer number of shares up for sales means bankers need to ensure there is deep enough demand from the largest investors.

Companies often revise IPO documents after the initial filing. Alibaba is in the process of fielding questions from the Securities and Exchange Commission, which must approve the document before shares can be priced and sold.

Before that approval comes, and before the company sets an expected price range on the stock, the company cannot speak to investors. Its bankers, however, can talk to investors generally about the company, though they cannot solicit from investors whether they would invest, or at what price they would buy in, according to U.S. rules.

The listing, in New York, is currently being planned for the first half of August, though the timing isn't set in stone. The company expects to shop the deal to investors globally, with large meetings in hubs possibly including Hong Kong, New York and London.

Telis Demos contributed to this article

Write to Anna Prior at anna.prior@wsj.com

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