Mitsui Sumitomo Insurance

Financial Services
TYO: 8725
Japan
MS Amlin

Lists an office in Tehran, Iran on its company website. 

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"Tokio Marine & Nichido Fire Insurance, Sompo Japan Insurance and Mitsui Sumitomo Insurance are among those that have approached Japanese oil refiners to cut coverage for Iranian oil and petrochemical shipments by more than 50 percent, the Nikkei business daily said on Wednesday." (Reuters, "Japan insurers to cut Iran oil insurance coverage," 4/4/2012)