By Mia Lamar 

HONG KONG--A disappointing start to the year for Chinese stocks is forcing some hedge funds to prove their mettle after banner performances in 2014.

Stocks in mainland China are lagging behind major indexes in Asia and elsewhere, testing hedge-fund managers that rode surging share prices in the second half of 2014 and posted big returns. China's unexpected easing of monetary policy and expansion of foreign-investor access to stocks spurred the rally, which has cooled after regulators cracked down on risky retail trading practices and economic growth slowed.

Hedge funds still see the potential for profits by taking advantage of big swings in a market dominated by retail investors, who are often quick to buy or sell in response to market chatter.

But the easy gains appear to be over. Stock hedge funds with an emphasis on China gained 0.45% in January, compared with an average 0.87% gain for Asian hedge funds tracked by Credit Suisse Group AG. Funds clung to gains as the MSCI China A-shares index, which tracks mainland shares, slid 2% in January, its first slump in months after a 43% surge in 2014. So far this year, the index is down 0.1%.

"The next three months will be much more of a trader's market," said Marlon Sanchez, head of Asia Pacific prime-finance sales for Deutsche Bank AG. To make money, fund managers are thinking more about how to bet on possible further policy changes in China, Mr. Sanchez added.

A $65 million hedge fund run by Shi Lin, formerly a director at Hillhouse Capital Group, gained 7.4% in January after fees were taken into account, according a letter sent to investors that was reviewed by The Wall Street Journal.

In the first week of January, Mr. Shi cut mainland stock holdings in his Brilliant Partners Fund to 2% from 25% of its portfolio because he believed the market was in "bubble territory," according to the letter. That move helped the fund dodge a selloff in the Shanghai Composite, which slid 7.7% on Jan. 19 after regulators cracked down on the use of borrowed money to buy stocks.

The hedge fund returned 52% in 2014.

Other funds stuck with mainland shares but were able to post gains. A fund launched in June by Neo-Criterion Capital to invest in mainland-listed A-shares gained 1% after fees in January, taking its return since inception to 45%, according to a letter sent to investors. NCC, established by Thomas Deng, former chief China strategist at Goldman Sachs Group Inc., and James Liu, a former executive at APS Asset Management Pte., oversees $340 million in assets.

Some funds didn't fare as well. A new stock hedge fund launched by BosValen Asset Management that makes wagers across Asian markets neither lost nor made money overall on A-share bets in January, according to a letter sent to investors.

As a result, the fund reduced its exposure to A-shares to about 20% of assets from about 30%, Ken Xu, BosValen's chief investment officer, said in an interview. Mr. Xu, a former managing director at SAC Capital Advisors LP, launched the $265 million fund in November with Simon Kemp, formerly a trader at Mount Kellett Capital.

In China, "you need to be patient," Mr. Xu said. "There are good months and bad months."

Some hedge funds continue to boost bets on Shanghai stocks by scooping up shares still perceived as bargains, said Matt Kiraly, head of sales and marketing for HSBC Holdings PLC's Asian prime finance division.

Other funds are delving into Shenzhen stocks, Mr. Kiraly added. While smaller than Shanghai's, Shenzhen's stock market is home to many of China's "new economy" stocks in sectors like technology and environmental protection.

Last year, Shanghai stocks climbed ahead of the November opening a trading link that connected the Hong Kong exchange to the local market and gave foreign investors easier access to Chinese shares. Hong Kong Chief Executive Leung Chun-ying has said the city is working with central authorities on a link to Shenzhen's market.

Stocks in Shenzhen are trading sharply higher in anticipation. The Shenzhen Composite is up 14% so far this year.

Write to Mia Lamar at mia.lamar@wsj.com

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