UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 OF THE

SECURITIES EXCHANGE ACT OF 1934

For the month of July 2026

Commission File Number: 001-41889

CADELER A/S

(Translation of registrant's name into English)

Kalvebod Brygge 43

DK-1560 Copenhagen V, Denmark

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x Form 40-F o

Press Release

Copenhagen, 1317 July 2026 – Cadeler ~~has~~today ~~signed~~announces anthe ~~EIFO-backed~~successful ~~senior~~delivery, ~~secured~~within ~~green~~budget ~~term~~and ~~loan~~on ~~facility~~schedule, of ~~EUR~~Wind ~~247~~Ace, ~~million~~the tocompany's ~~finance~~eleventh inwind ~~part~~installation ~~the~~vessel ~~construction~~and second of ~~its~~three ~~third~~A-class newbuilds. Cadeler’s A-class ~~newbuild~~vessels ~~offshore~~are ~~wind~~industry ~~installation~~leading ~~vessel,~~in ~~Wind~~flexibility ~~Apex~~and scope, ~~with~~capable ~~delivery~~of ~~expected~~conversion infrom Q2the ~~2027~~installation of XXL foundations to the installation of wind turbine generators within a short period of time.

~~The~~Wind ~~12-year~~Ace ~~facility~~has isbeen ~~supported~~under byconstruction for the ~~Export~~past ~~and~~two ~~Investment~~years ~~Fund~~at ofthe ~~Denmark~~COSCO ~~(EIFO)~~Shipping Offshore shipyard in Qidong, China, and has been ~~designated~~delivered ason ~~green~~schedule, ~~financing~~within ~~under~~budget, ~~Cadeler's~~and ~~Green~~with ~~Finance~~a ~~Framework~~strong safety record during construction, by reaching more than 3,5 million working hours without any lost time accidents.

~~The~~Following ~~Hongkong~~mobilisation, ~~and~~Wind ~~Shanghai~~Ace ~~Banking~~will ~~Corporation~~prepare ~~Limited,~~for ~~Singapore~~deployment ~~Branch~~on ~~acted~~ScottishPower asRenewables' ~~Coordinator,~~East ~~Mandated~~Anglia ~~Lead~~TWO ~~Arranger,~~offshore ~~Facility~~wind ~~Agent,~~farm ~~Security~~in ~~Agent~~the UK. Cadeler will provide the transportation and ~~EIFO~~installation ~~Agent.~~of ~~The~~both ~~lending~~foundations ~~syndicate~~and ~~comprises~~wind ~~HSBC,~~turbines ~~KfW~~for ~~IPEX-Bank~~the project, ~~Coöperatieve~~further ~~Rabobank~~building ~~U.A.~~on ~~and~~the ~~DNB~~company's ~~Bank~~experience ~~ASA~~as a full-scope offshore wind installation partner.

~~Commenting~~The onvessel ~~the~~was ~~financing,~~officially ~~Mikkel~~named ~~Gleerup,~~earlier ~~CEO of Cadeler, says: “We are pleased to have secured~~ this ~~financing~~year ~~for~~by ~~Wind~~her ~~Apex~~godmother, ~~together~~Lisa ~~with~~Western ~~a strong group~~ of ~~international~~ScottishPower ~~banking~~Renewables, ~~partners.~~recognising Wethe ~~greatly~~close ~~value~~partnership ~~our~~between ~~longstanding~~the ~~relationship~~two ~~with~~companies ~~EIFO~~ and ~~appreciate~~Wind ~~their continued support for Cadeler~~Ace's ~~growth.~~future ~~Their~~role ~~backing, together with that of our lending partners, reflects continued confidence~~ in ~~Cadeler and our ability to deliver~~ the ~~offshore~~delivery ~~wind~~of ~~installation~~East ~~capacity~~Anglia ~~our customers need~~TWO.”

~~Peter~~As ~~Boeskov,~~the ~~COO~~second atvessel ~~EIFO~~in ~~Large~~Cadeler's ~~Corporates~~A-class ~~comments:~~series, ~~“Strengthening~~Wind ~~Danish~~Ace ~~companies~~is ~~and~~purpose-built ~~supply~~for ~~chains in~~ the ~~energy~~transportation ~~transition~~and isinstallation aof ~~strategic~~both ~~priority~~XXL ~~for~~monopile ~~EIFO.~~foundations ~~Cadeler~~and ~~exemplifies~~next-generation ~~how~~wind ~~quickly~~turbine ~~Danish~~generators. ~~expertise~~The ~~can~~vessel’s ~~scale~~hybrid ~~globally,~~design ~~now~~provides ~~operating~~ the ~~world’s~~flexibility ~~largest~~to ~~installation~~efficiently ~~fleet~~perform ~~for~~both ~~offshore~~foundation and wind. ~~With~~turbine ~~this~~installation ~~third transaction~~scopes, wesupporting ~~reaffirm~~the ~~our~~increasing ~~long-term~~scale ~~commitment~~and tocomplexity ~~supporting~~of ~~Cadeler's~~offshore ~~continued~~wind ~~growth~~developments.”

Preparing for East Anglia TWO

East Anglia TWO is a 960 MW offshore wind farm being developed by ScottishPower Renewables, part of the Iberdrola Group, in the North Sea off the south-east coast of England. Once operational, the wind farm will generate enough renewable electricity to power the equivalent of almost one million homes. Under firm contracts announced in 2024, Cadeler will provide the transportation and installation of all 64 wind turbine generators and their foundations. Offshore works are scheduled to commence in 2027, with Wind Ace supporting the project alongside one of Cadeler's O-class vessels.

Mikkel Gleerup, CEO of Cadeler, comments: "The delivery of Wind Ace marks another important step in our long-term strategy to build the industry's most capable and versatile fleet. Together with her sister vessel Wind Ally, Wind Ace strengthens our ability to support the next generation of offshore wind projects. As turbines and foundations grow larger and projects become more complex, our clients need full-scope installation partners with the capabilities to deliver safely and reliably. We look forward to seeing her begin work for ScottishPower Renewables, delivering another significant offshore wind farm in UK waters."

With the delivery of Wind Ace, Cadeler operates a fleet of eleven offshore wind installation vessels. The company's third A-class vessel, Wind Apex, is scheduled for delivery in the first half of 2027.

For further information, please contact:

Cadeler Press Office

press@cadeler.com

Mikkel Gleerup
CEO, Cadeler
+45 3246 3102
mikkel.gleerup@cadeler.com

Alexander Simmonds
EVP & CLO, Cadeler
+44 7376 174172
alexander.simmonds@cadeler.com

About Cadeler:

Cadeler A/S (Cadeler) is a pure-play offshore wind installation partner and a global leader in offshore wind turbine transport and installation. The company owns and operates the industry’s largest fleet of jack-up offshore wind installation vessels and is expanding its capabilities into full-scope foundation transport and installation, as well as operations & maintenance. With its modern fleet and depth of expertise across onshore and offshore operations, Cadeler supports the safe, efficient and reliable delivery of offshore wind projects worldwide. Cadeler is listed on the New York Stock Exchange (ticker: CDLR) and the Oslo Stock Exchange (ticker: CADLR). For more information, please visit www.cadeler.com.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: July 1317, 2026 CADELER A/S

(Registrant)

By: /s/ Mikkel Gleerup
Name:     Mikkel Gleerup
Title:    Chief Executive Officer

Filing Compare · Cadeler A/S