HONG KONG (Reuters) -Shares of China battery giant CATL opened 12.5% higher than the subscription price on Tuesday after the company raised $4.6 billion in its Hong Kong listing, the largest of its kind in the world this year.

CATL shares started trading at HK$296 each in Hong Kong after the firm sold its shares at HK$263 apiece in the listing.

Hong Kong's Hang Seng Index was up 0.3% in early trading.

CATL, which is also listed in Shenzhen, sold 135.6 million shares in Hong Kong to raise $4.6 billion, which was the largest listing in the city since Midea Group raised the same amount last year. CATL's Shenzhen stock was down about 0.5% on Tuesday.

The institutional tranche of the Hong Kong deal was oversubscribed 15.2 times, according to CATL's filings, while the retail portion was 151 times oversubscribed.

"The Hong Kong stock listing means our wider integration into the global capital market and a new starting point for us to promote the global zero-carbon economy," CATL Founder and Chairman Robin Zeng said at a listing ceremony in Hong Kong.

CATL had aimed to raise about $4 billion in the listing but increased the size of the deal following the strong demand from investors.

A further 17.7 million can be sold as part of a so-called "green shoe option" that would take the size of CATL's raising to $5.3 billion.

At that size, it would be the largest listing in Hong Kong since Kuaishou Technology raised $6.2 billion in 2021, according to LSEG data.

CATL's bookbuild had been open for a day when the U.S. and China announced a brief truce in the trade war that had roiled global financial markets since early April.

The U.S. will cut extra tariffs it imposed on Chinese imports last month from 145% to 30% for the next three months, the two sides said last week, while Chinese duties on U.S. imports will fall to 10% from 125%.

The move created some extra momentum for CATL, whose bookbuild had been already covered with pre-commitment orders when the deal launched last Monday, according to two sources with direct knowledge of the bookbuilding process.

The tariffs pause prompted some global long-only investors who had previously not bid for CATL stock in the Hong Kong listing to place orders, they added.

CATL did not respond to a request for comment.

CATL's net profit in the first three months of 2025 rose 32.9% year-on-year to 14 billion yuan ($1.91 billion), its fastest pace in nearly two years.

It has been extending its lead in the electric vehicle battery market with a 38% share globally in 2024. That increased from 36% a year ago, according to data from SNE Research.