The firms include Suzhou Gold Mantis Construction Decoration Co, a designer of hotels and office buildings, and Huayi Brothers Media Corp, whose movie Journey to the West: Conquering the Demons generated the most revenue among domestic films in 2013. Alibaba or related entities own stakes in both companies, according to GF Securities.

Hundsun Technologies fell 2.7 percent at the close in Shanghai on Tuesday, while Suzhou Gold Mantis retreated 5 percent. Huayi Brothers dropped 2.7 percent. The Shanghai index slid 1.8 percent, while the MSCI Emerging Markets Index lost 0.4 percent.

"It's a good strategy to buy shares of companies that are affiliated to Alibaba, since domestic investors can't directly invest in its IPO," Dai Ming, a money manager at Hengsheng Hongding Asset Management Co in Shanghai, which oversees about $193 million, said by phone on Friday.

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Optimism about the IPO has also boosted Alibaba-linked shares outside the mainland. SoftBank, the Japanese telecommunications company that owns a stake in Alibaba, has gained 19 percent during the past month through Monday while Yahoo, which has a 23 percent holding, rose 18 percent.

Chinese Internet users have grown to 632 million, greater than the population of any other country except India, and could exceed 850 million by 2015, according to government data. McKinsey & Co predicts online retailing in the world's second-largest economy will reach $395 billion next year, triple its 2011 level.

Most of Alibaba's biggest competitors are traded outside the Chinese mainland. JD.com Inc, a Beijing-based online retailer, is listed in the US. Baidu Inc, China's biggest search engine, also trades in New York, while Tencent Holdings Ltd, operator of the WeChat social messaging network, is listed in Hong Kong. The latter two companies are forming an online shopping venture with Dalian Wanda Group Co Ltd, a Chinese developer, to challenge Alibaba.

China limits overseas equity investments by most of its citizens to those made through asset managers as part of the Qualified Domestic Institutional Investor program.

Some funds have been set up for investors looking to tap into Alibaba. Harvest Fund Management Co, one of China's oldest asset managers, has started Harvest Opportunities Target Fund 1 to give Chinese mainland investors access to the Alibaba IPO.

Mainland investors have already priced in the positive impact of Alibaba's IPO on some affiliated companies, Zeng Xianzhao, an analyst at Everbright Securities Co, said by phone from Chongqing.

Hundsun Technologies was valued at 62 times reported earnings on Monday, the highest multiple since 2010, versus 11 for the Shanghai Composite Index, according to data compiled by Bloomberg. Huayi Brothers Media has a multiple of 42.

The performance of Apple Inc suppliers in China may offer a guide for what to expect from Alibaba-linked companies, according to Hengsheng Hongding Asset's Dai Ming. Goertek Inc, a wireless communication products maker, has gained 95 percent since September 2011, while Han's Laser Technology Co jumped 111 percent and Shenzhen Desay Battery Technology Co advanced 124 percent.