Subject: Re: Bought 2.5% of Tokio Marine
Further in depth queries revealed that the company does offer marine insurance underwriting.

I wondered if stock price was affected by recent Iran war and closure of Hormuz Strait.

Stock price is down by about 9-10% after start of the war. I doubt that was the reason for Berkshire making the bid. They must have been evaluating the company and liked it enough to want to invest in and partner with it. The fall in stock price must have been a pleasant bonus.