What is the largest revenue-contributing business segment for Huntsman Corp, and what percentage of total revenue does it represent?

The largest revenue-contributing business segment for Huntsman Corp is the MDI urethanes segment, which accounts for 65.05% of the company's total revenue, as stated in the news body.

Which geographic region generates the highest share of Huntsman Corp's revenue, and what is that share?

The US & Canada region generates the highest share of Huntsman Corp's revenue, representing 38.66% of the company's total revenue, according to the provided financial breakdown.