# Tosoh to acquire full ownership of Nanyo Kasei from Asahi Kasei

Tosoh Corporation will acquire the 50% stake in Nanyo Kasei held by Asahi Kasei, making the HDI monomer joint venture a wholly owned subsidiary. The transaction is scheduled for March 31, 2027.

- Type: Acquisition
- Announced: 2026-10-13
- Where: Japan
- Status: announced
- Products: HDI monomer
- Sectors: [Specialty Chemicals](https://endata.com/sectors/specialty-chemicals.md)

## Companies

- [Asahi Kasei](https://endata.com/companies/8888.md) (partner)
- [Asahi Kasei](https://endata.com/companies/8888.md) (target)
- [Tosoh](https://endata.com/companies/19811.md) (acquirer)
- [Nanyo Kasei](https://endata.com/companies/94560.md) (target)

## Sources

- [tosoh.co.jp](https://www.tosoh.co.jp/news/release/2026/20261013.html), 2026-10-13: "東ソーは、旭化成株式会社との合弁会社である南陽化成株式会社について、旭化成株式会社保有の全株式（50％）を取得し、完全子会社化することを決定いたしました。"
- [everchem.com](https://everchem.com/tosoh-to-acquire-remaining-hdi-shares-from-asahi-kasei/), 2026-10-13: "Tosoh Corporation announced plans to acquire the remaining 50% ownership stake in Nanyo Kasei Co., Ltd. from Asahi Kasei Corporation, making the HDI monomer producer a wholly owned Tosoh subsidiary."
- [plastmatch.com](https://www.plastmatch.com/news/tosoh-to-acquire-asahi-kasei-s-stake-in-hdi-451xlroe-detail), 2026-10-15: "Tosoh will acquire the 50% stake in Nanyo Kasei held by Asahi Kasei."

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Data from Endata (https://endata.com/). Announcements are summarized from public sources and may be incomplete; check the linked originals.