(Bloomberg) — The world-beating rally in Chinese stocks is failing to convince many global fund managers and strategists.

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Invesco Ltd., JPMorgan Asset Management, HSBC Global Private Banking and Wealth, and Nomura Holdings Inc. are among those viewing the recent rebound with skepticism and waiting for Beijing to back up its stimulus pledges with real money. Some are also concerned many stocks are already reaching overvalued levels.

Chinese shares have skyrocketed since late-September as a barrage of economic, financial and market-support measures reinvigorated investor confidence and prompted the likes of Goldman Sachs Group Inc. to upgrade the nation’s stocks to overweight. The Hang Seng China Enterprises Index, which comprises Chinese stocks listed in Hong Kong, has jumped more than 35% over the past month, making it the best performer among more than 90 global equity gauges tracked by Bloomberg, while raising concern it may be too far, too fast.

“In the short term, sentiment could overshoot but people will go back to fundamentals,” said Raymond Ma, Invesco’s chief investment officer for Hong Kong and Mainland China. “Because of this rally, some stocks have become really overvalued” and they lack a clear value proposition based on their likely earnings performance, he said.

Stimulus announced by Beijing has included interest-rate cuts, freeing-up of cash at banks, billions of dollars of liquidity support for stocks, and a vow to end the long-term slide in property prices. The China National Development and Reform Commission will host a press conference Tuesday to discuss implementation of a package of incremental economic policies.

While there’s plenty of optimism that could underpin a sustainable equity rally, there have been a number of false dawns before, most recently a rally in February that completely unwound.

Ma at Invesco, who was one of relatively few China bulls coming into this year, said he’s in no rush to add to his investments now.

“There are a group of stocks whose share prices are up by 30% to 40% and almost at historical highs,” he said. “Whether in the next 12 months the fundamentals will be as good as before their peak, that’s more uncertain to me. That would be the category we would like to trim.”

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The surge in the past two weeks has seen Chinese equities reassert their influence over broader emerging-market gauges, and dented the performance of fund managers who had been running underweight positions in the biggest developing-nation economy. The durability of the rebound will not only matter for the year-end performance of index-tracking funds, but also have direct implications for nations that have trading and investment links with China.

More Needed

JPMorgan Asset Management is just as cautious.

“Additional policy steps would be needed to boost economic activity and confidence,” said Tai Hui, Asia Pacific chief market strategist in Hong Kong. “The policies announced so far can help to smoothen out the de-leveraging process, but the balance-sheet repairing would still need to take place.”

Hui also pointed to global uncertainties that may crimp the nascent stock rally.

“With the U.S. elections only a month away, many investors would argue that the U.S. view of China as an economic and geopolitical rival is a bipartisan consensus,” he said. Moreover, “foreign investors may choose to wait for economic data to bottom out and for this new policy direct to solidify,’ he said.

Slowing Growth

HSBC Global Private Banking remains concerned the steps China has taken aren’t enough to reverse the nation’s slowing long-term growth outlook.

“More significant fiscal easing is still needed to sustain the recovery momentum and shore up growth to achieve the 5% 2024 GDP growth target,” said Cheuk Wan Fan, chief investment officer for Asia at the private bank in Hong Kong. “For now, we stay neutral on mainland China and Hong Kong equities based on our expectation of China’s GDP growth decelerating from 4.9% in 2024 to 4.5% in 2025.”

Goldman Positive

Some are predicting further gains.

Goldman Sachs Group Inc. has upgraded its call on Chinese stocks to overweight, and said indexes tracking the nation’s equities may rise another 15%-to-20% if authorities deliver on policy measures.

Beijing’s recent stimulus announcements “have led the market to believe that policy makers have become more concerned about taking sufficient action to curtail left-tail growth risk,” strategists including Tim Moe wrote in a note dated Oct. 5.

Bond ‘Challenges’

Some investors and strategists are also wary about what the stimulus blitz means for the nation’s bonds and currency.

China’s bonds have dropped since the stock rally started, ending at least temporarily a period in which yields set successive record lows as investors bought haven assets.

“There are still major challenges to be resolved, and it’s not an easy road,” said Lynn Song, chief economist for Greater China at ING Bank in Hong Kong. “We need to ensure that this policy blitz is effective in stabilizing the downward trajectory of the housing market and not just result in a rush of hot money to equities.”

Bonds may become a beneficiary if the stock market cools, Song said. “There’s certainly a risk we could revert back to the previous months’ environment if anything goes wrong in the next steps ahead.”

Yuan traders will be watching out on Tuesday for the central bank’s daily reference rate, the level around which the currency is allowed to trade. The onshore yuan has strengthened more than 1% in the past month to approach the key level of 7 per dollar. A break of that barrier may trigger a further rally.

What to Watch

• China publishes FX reserves data for September

• A swath of countries release inflation data, including Thailand, Brazil, Mexico, Chile and Argentina

• Central banks in India, Peru and South Korea announce interest-rate decisions

• Mexico and India release industrial production data

–With assistance from Shulun Huang and Carolina Wilson.

(Updates to add view from Goldman in the third paragraph.)

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