Started April 2023, Seudamgo are running a twice-daily service between Laem Sok and Koh Kood. They claim the fastest crossing time of 40 minutes with a modern smallish catamaran carrying a maximum of 84 passengers and it's scheduled to run throughout the year. Goes from Laem Sok to Koh Kood at 12:00 and 16:00, and returns from Koh Kood to Laem Sok at 10:00 and 13:30. The 16:00 transfer to Koh Kood is now by far the latest departure of the day and it opens up Koh Kood to passengers arriving into Bangkok on the same day, and to those taking a public bus from Bangkok in the morning. A second vessel is planned for introduction later this year.
Update ! Until 30th September 2023, the fare has been discounted to just 500 Baht !!