Chinese mainland battery materials maker Yangzhou Nanopore Innovative Materials Technology Ltd has filed confidentially for an initial public offering in the Hong Kong Special Administrative Region that could raise at least $200 million, according people familiar with the matter.

Yangzhou Nanopore is working with banks, including BNP Paribas SA, on the planned IPO, the people said on condition of not being identified because the information isn’t public. It is targeting to list by the end of this year, the people said.

Deliberations are ongoing and details such as the size and timing of the offering could still change, the people said. Representatives for Yangzhou Nanopore and BNP declined to comment.

ALSO READ: Alibaba-backed Zelos is said to plan HK IPO to raise about $600m

Based in Yangzhou, the company makes composite current collectors used in lithium ion batteries and supplies companies including Tesla Inc and mainland battery giant Contemporary Amperex Technology Co. Its current backers include Singapore state investor Temasek and China International Capital Corp, according to data compiled by Bloomberg.