Shares of Chinese jeweler Laopu Gold Co and miner CMOC Group Ltd rallied in Hong Kong, after Hang Seng Indexes Co added the stocks to the city’s equity benchmark gauge following a quarterly review.

Laopu and CMOC each rose more than 7 percent at their highs on Monday. Electric vehicle battery giant Contemporary Amperex Technology Co, another stock to be added to the list, rose as much as 3.8 percent.

Prices may have been amplified by thin liquidity during holiday-shortened trading hours.

The changes, effective March 9, will bring the number of members on the Hang Seng Index to 90 from 88, according to a statement. The index compiler said it will remove auto retailer Zhongsheng Group Holdings Ltd, which fell as much as 3.2 percent.

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The Hang Seng Index was little changed on Monday, before financial markets close for a three-day Chinese New Year holiday.

The benchmark has gained 3.6 percent in 2026, as momentum slowed after a 28 percent advance last year. The reshuffle is closely watched as a sign of which listed companies have excelled across key metrics, such as market capitalization and turnover. CATL, whose shares were listed in the financial hub in May, has doubled since then.

Changes were also announced for the Hang Seng China Enterprises Index and the Hang Seng Composite Index.

“In aggregate, the rebalancing could generate nearly $8 billion in gross two-way passive flows,” Goldman Sachs Group Inc strategists including Alvin So wrote in a note.

Looking at previous patterns following the reshuffle, “HSI additions outperformed early but gave back gains into the announcement,” they added.