Hang Seng Indexes unveiled a wide-ranging overhaul of its eponymous gauge on Monday, including increasing the number of constituents from 52 to 80 and limiting a stock’s weighting to 8%.

It also said it would shorten the listing history requirement for a company to be included into the gauge to three months.

The moves, expected to come into force next year, will impact tens of billions of dollars on the world’s fourth-largest stock market.

The announcement was welcome news to mainland tech giants, who have increasingly chosen to list in Hong Kong – with several billion raised in initial public offerings last year – especially as trade tensions between Beijing and Washington have surged.

Under the new rules, such firms that are secondary-listed or carry unequal voting rights will no longer be limited to give percent weightings.

Electronics giant Xiaomi jumped 2.5% in afternoon trade, e-commerce platforms Meituan and JD.com were up 2% and 2.8% respectively and video app Kuaishou jumped more than 5%.

“The valuation of the index will be pushed higher as more new economy stocks are expected to join under the changes,” Dickie Wong, executive director of research at Kingston Securities told Bloomberg.

“This could also make the index more volatile.”

Thanks to its long-held status as a regional finance hub, Hong Kong’s stock exchange has been dominated by banks and insurers, many of whom fell on Tuesday on news of the changes.

“The biggest losers probably would be in the finance or banking sectors, as they are the heaviest constituent stocks in the Hang Seng index now,” Edison Pun, senior market analyst at Saxo Markets Hong Kong told Bloomberg News.

“With the adjustment, their importance would be greatly reduced.”