Koru (Y721)

• Builder: Oceanco, Alblasserdam, Netherlands
• Length: approximately 127 metres (reported)
• Type: three-masted sailing yacht, schooner rig
• Delivered: 2023
• Gross tonnage: reported at roughly 3,000 to 3,500 GT
• Naval architecture and rig: Dykstra Naval Architects with Lateral Naval Architects
• Interior design: Mlinaric, Henry and Zervudachi
• Distinction: largest sailing yacht in the world and largest yacht built in the Netherlands

The record that reset the sailing class

Koru occupies a position that few yachts ever reach, sitting at the very top of the sailing fleet by length. At a reported 127 metres she pushed past every existing sailing record and became the largest yacht of any kind ever completed on Dutch soil. The scale matters because sail adds problems that motor yachts avoid, from rig loads to the height of the masts against every bridge between the shed and the sea. Oceanco took that on rather than steer the design towards an easier motor profile.

The project ran under the yard name Y721 for years before the name Koru appeared, a Maori word for the unfurling frond associated with new beginnings. That reticence was deliberate, since the owner has never been publicly named by the builder. Reporting has consistently linked the yacht to Jeff Bezos, and that link is now widely repeated, yet it rests on observation and unnamed sources rather than confirmation. The care around her identity became part of the story.

A hull drawn for the open ocean

The exterior carries the hand of Dykstra Naval Architects, a studio with a long record in large sailing yachts. The navy hull runs long and low, with three masts spaced along a clean sheerline and very little clutter above deck. Guest volume sits within the hull rather than piled into a tall superstructure, which keeps the silhouette closer to a classic schooner than to a modern motor yacht. That restraint is what allows the rig to dominate the profile.

Interior work went to the London studio Mlinaric, Henry and Zervudachi, a firm better known for houses and grand rooms than for yachts. The choice fits a vessel that reads as a private residence under sail rather than a charter platform. Reliable detail on the interior is scarce, in keeping with the secrecy around the whole project. What is clear from the exterior is a preference for line and proportion over spectacle.

The masts that almost forced a historic Rotterdam bridge apart.

Masts, bridges and the limits of scale

Building a sailing yacht of this height created a problem that no interior could solve. The finished masts were too tall to pass beneath the Koningshaven bridge, known locally as De Hef, on the route out of Alblasserdam to open water. A proposal to partially dismantle the historic bridge drew public anger in Rotterdam and became an international news story in its own right. In the end the yard stepped the masts only after the hull had been moved downstream, and the bridge was left untouched.

The engineering beneath that episode is substantial. A rig of this size demands careful load paths through a steel hull and aluminium superstructure, along with a sail handling system that a modest crew can manage safely. Oceanco worked with Lateral Naval Architects on the naval side alongside Dykstra. The result is a yacht that can be sailed rather than merely displayed, which is not a given at these dimensions.

Life aboard a private record

Koru is configured for private use rather than charter, and the yard has released little about her accommodation. Reporting points to space for around eighteen guests and a large professional crew, with the numbers that a full sailing rig requires. The long hull gives generous deck runs and the kind of quiet that sail makes possible when the engines are off. This is a yacht meant for long passages rather than harbour display.

She does not travel alone. A separate support vessel named Abeona, built by Damen, carries a helicopter, tenders and water toys that the sailing yacht keeps off her own clean decks. That division of labour lets Koru stay uncluttered while the owner still has the equipment of a large motor yacht nearby. The pairing has become a common pattern at the top of the market, and Koru is among its most visible examples.

The price of being the largest

A yacht of this scale is a statement whether or not the owner wants one. Estimates of her cost have circulated widely in the press, often near half a billion dollars, though no figure has been confirmed and such numbers should be treated with caution. What is certain is that she reset the sailing record and drew attention that a motor yacht of similar value might have avoided. The bridge dispute guaranteed that even people outside yachting knew her name.

For Oceanco the project is a demonstration of reach. Completing the largest sailing yacht in the world, and the largest yacht ever built in the country, places the yard on a very short list of builders able to attempt such a thing. For the reported owner it is a private vessel that has become unusually public. Both facts now travel with the name Koru.

Design

• Exterior: Dykstra Naval Architects (exterior styling / rig)
• Interior: Mlinaric, Henry & Zervudachi
• Naval architecture: Lateral Naval Architects (with Dykstra Naval Architects)

Who it is for: An owner who wants the outright sailing record and the privacy of a residence at sea, and who can absorb the scrutiny that both attract.

Guide price: Not officially for sale; build cost widely reported at approx. US$500 million (estimate, Bloomberg / BOAT International). No verified public asking price.