Atrium Underwriters — the managing agency of Lloyd’s of London Syndicate 609 — is to exit the marine reinsurance business in January 2023.

The underwriter’s Marine XL reinsurance book of business will be put into run-off.

“Continuing in the class was deemed unviable as Atrium look to focus their efforts and capacity into their direct specialty classes,” Atrium said in a statement.

The move does not affect Atrium’s primary marine insurance business.