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M&A and Subsidiary Changes4005SUMITOMO CHEMICAL COMPANY,LIMITEDMaterials and Chemicals

(Progress of Previously Disclosed Matter) Notice Regarding the Execution of an Absorption-Type Company Split Agreement for the Integration of the Domestic Polyolefin Business (PP and LLDPE) (Simplified Absorption-Type Company Split)

Regarding the integration of the domestic polyolefin businesses announced on 24 December 2025, Sumitomo Chemical entered into an absorption-type company split agreement on 1 April 2026 for the first stage, under which the subject business will change from Sumitomo Chemical to Prime Polymer. The effective date of the first stage is scheduled for 1 July 2026.

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This transaction

This Business Integration / This Absorption-Type Company Split / Absorption-Type Company Split 1
CounterpartyPrime Polymer Co., Ltd., Mitsui Chemicals,Inc., Idemitsu Kosan Co.,Ltd.
Disclosing companySUMITOMO CHEMICAL COMPANY,LIMITED
Prime Polymer Co., Ltd.Subject of this transaction
TimelineThe spacing between the points is proportional to the actual number of days.
Consideration and expenses
Type of ConsiderationShares (the Company will acquire shares in Prime Polymer equivalent to a 20% interest in the company)
Procedures and assumptions
Conditions Precedent to ExecutionCompletion of the required clearances and approvals under competition laws and other laws and regulations
This transaction
ItemDetails
Transaction nameThis Business Integration / This Absorption-Type Company Split / Absorption-Type Company Split 1
Counterparty namePrime Polymer Co., Ltd., Mitsui Chemicals,Inc., Idemitsu Kosan Co.,Ltd.
Name of the Subject CompanyPrime Polymer Co., Ltd.
Type of ConsiderationShares (the Company will acquire shares in Prime Polymer equivalent to a 20% interest in the company)
Date of board resolution1 April 2026
Contract Date1 April 2026
Execution Date / Effective Date1 July 2026 (scheduled) / Absorption-Type Company Split 2: 1 April 2027 (scheduled)
Conditions Precedent to ExecutionCompletion of the required clearances and approvals under competition laws and other laws and regulations
Items this document does not state (24)
Business Description of the Subject CompanyLocation of the Subject CompanyCapital Stock of the Subject CompanyDate of Establishment of the Subject CompanyNet Sales of the Subject CompanyOperating Profit of the Subject CompanyNet Income of the Subject CompanyNet Assets of the Subject CompanyAcquisition priceExpenses other than the acquisition priceMerger ratio/share exchange ratioTender offer priceMinimum number of shares to be purchasedTender offer periodNumber of shares acquiredVoting rights ownership percentageFunding arrangementsGoodwill amountAmount of extraordinary income (loss)Impact on Business PerformanceValuation methodologyIndependent valuation institutionSpecial CommitteeManagement structure after acquisition

These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.

The reasons the company gives

The company's own explanation, not something inferred from the numbers.

To have the domestic polyolefin businesses, comprising the polypropylene business and linear low-density polyethylene business, change from Sumitomo Chemical to Prime Polymer and implement the business integration.

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(Progress of Previously Disclosed Matter) Notice Regarding the Execution of an Absorption-Type Company Split Agreement for the Integration of the Domestic Polyolefin Business (PP and LLDPE) (Simplified Absorption-Type Company Split) | SUMITOMO CHEMICAL COMPANY,LIMITED (4005) timely disclosure | Komori