Moody's Investors Service — which in January cut its Hong Kong rating to Aa3, one notch above its A1 rating for China, on the back of concerns the territory's institutions and governance weren't as strong as previously thought — appeared less confident on that score.
China's new security law for Hong Kong could further reduce "the autonomy of Hong Kong's lawmaking and judicial institutions (with) negative implications for the effectiveness of Hong Kong's institutional governance," said Martin Petch, Singapore-based vice president and senior credit officer with Moody's sovereign risk group.
The resulting change in external perceptions of Hong Kong could "add to downward pressure on the rating, particularly "if the international response ... leads to a weakening of Hong Kong's role as an international economic and financial center," Mr. Petch said.
Additionally, equity index providers could now decide to take a fresh look at Hong Kong, which is currently in the MSCI World index with other developed markets. China is in the emerging markets index. It is unclear whether the most recent move would result in index providers treating Hong Kong the same as other Chinese cities, such as Shanghai and Shenzhen.
Whether such concerns prove to be more exception than rule is an open question for now, observers say.
"Financial centers thrive on attracting and retaining international talent, and it remains to be seen whether the security law will make Hong Kong a less attractive place to work," said Mike Wardle, the London-based head of indices with Z/Yen Group Ltd., a research firm that publishes a twice-yearly ranking of global financial centers.
In the firm's latest global ranking, released March 26, Hong Kong dropped to sixth place from third six months earlier, with one mention of the "social unrest" — sparked by the legislature's consideration of a bill that would have allowed its citizens to be extradited to the mainland — that had rocked the territory since mid-2019.
For the current security law contretemps, Mr. Lardy said the U.S. administration would be better served waiting to see how the new law is implemented before responding. Will the Chinese army's Hong Kong garrison be used to control crowds? Will people be whisked out of hotels or arrested in broad daylight and marched to China to be tried for crimes real or imagined, he asked.
Despite continued uncertainty, Mr. Lardy said his best guess is that Hong Kong remains "a very strong financial center," with substantial advantages over other financial centers in the region that can't be easily replicated elsewhere.
Some money management executives in the region say they're not worried about the new security law.
"I don't think there will be any change at all to Hong Kong's status as an international financial center," said Weijian Shan, chairman and CEO of Hong Kong-based private markets and alternatives investment firm PAG Group.
"Every country, including the U.S., U.K. and Singapore, has a national security law which doesn't weaken the rule of law, but protects it including all its ingredients such as the presumption of innocence, due process and judicial independence," Mr. Shan said.
Others say the global tug of war between China and the U.S. could, in some respects, even elevate Hong Kong's importance as a financial center. Legislation is moving through Washington now that could result in Chinese companies being delisted from U.S. stock exchanges, noted Thomas Cheong, Hong Kong-based president of Principal Financial Group's business in Asia.
If that occurs, the natural home for those listings would be Hong Kong, cementing the financial center's status as the first stop for the growing ranks of overseas investors looking to allocate more to mainland China stocks and bonds, Mr. Cheong predicted.
The loss of some of Hong Kong's freedoms — and vitality — would be missed, managers said. But with most firms already focusing on China's mainland market as their biggest growth opportunity in coming decades, that prospect is unlikely to scare many away, they said.
At the end of the day, a number of money managers said an end to the demonstrations — and occasional riots — that rocked Hong Kong much of the past year would be welcomed.
"Hong Kong as a city cannot live with the riots over the last year," said one veteran Hong Kong-based private equity investor, who requested anonymity.
"I love Hong Kong," said the investor. "It's unique, like no other city, a wonderful place, but we all have to get used to change," he said.
Bloomberg News contributed to this story.