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.

“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。”tosoh.co.jp

• 3 sources
• tosoh.co.jp南陽化成株式会社の株式取得（完全子会社化）に関するお知らせ｜ニュース｜東ソーOct 13, 2026
• everchem.comTosoh To Acquire Remaining HDI Shares from Asahi Kasei - Everchem Specialty ChemicalsOct 13, 2026
• plastmatch.comTosoh to Acquire Asahi Kasei’s Stake in HDI Monomer JV, Gain Full Ownership | Plastmatch NewsPlastmatchOct 15, 2026

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