[6-K] Cadeler A/S Current Report (Foreign Issuer)

Rhea-AI Filing Summary

Cadeler A/S reports share purchases by a person closely associated with a board member. Niki Invest ApS, which is closely associated with board member Ditlev Wedell-Wedellsborg, bought Cadeler shares on the Oslo Stock Exchange.

On 21 November 2025, Niki Invest ApS purchased 15,729 shares at an average price of NOK 40.0288 per share, for a total of NOK 629,613.1830. On 24 November 2025, it purchased a further 16,550 shares at an average price of NOK 40.8854 per share, for a total of NOK 676,653.8000. These transactions were reported under EU Market Abuse Regulation rules for persons discharging managerial responsibilities and their closely associated persons.

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 November 2025

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

Stock Exchange Announcement

CADELER A/S: REPORTING ON TRANSACTIONS IN CADELER A/S SHARES BY PERSONS DISCHARGING MANAGERIAL RESPONSIBILITIES AND PERSONS CLOSELY ASSOCIATED WITH THEM

Copenhagen, 25 November 2025: Cadeler A/S (“Cadeler”) has received notification pursuant to article 19 of the Market Abuse Regulation (EU) no. 596/2014 of the below transaction related to shares in Cadeler made by persons discharging managerial responsibilities in Cadeler and/or persons closely associated with them.

Niki Invest ApS, a person closely associated with Ditlev Wedell-Wedellsborg, member of the Board of Directors, has made the transactions described in the attached notification on the dates set out therein.

Please see the attached file for further details.

For further information, please contact:

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 A/S:

Cadeler is a global leader in offshore wind installation, operations, and maintenance services. Cadeler is a pure play company, operating solely in the offshore wind industry with an uncompromising focus on safety and the environment. Cadeler owns and operates the industry’s largest fleet of jack-up offshore wind installation vessels and has for more than 10 years been a key supplier in the development of offshore wind energy to power millions of households. Cadeler’s fleet, expertise and capacity to handle the largest and most complex next-generation offshore wind installation projects positions the company to deliver exceptional services to the industry. Cadeler is committed to being at the forefront of sustainable wind farm installation and to enabling the global energy transition towards a future built on renewable energy. 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

Reporting of transactions made by persons discharging managerial responsibilities and persons closely associated with them in Cadeler A/S’ shares

1	Details of the Reporting Person and their Closely Associated Persons
a)	Name	Niki Invest ApS
2	Reason for the notification
a)	Position/status	Closely associated person to Ditlev Wedell-Wedellsborg, member of the Board of Directors
b)	Initial notification /Amendment	Initial notification
3	Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a)	Name	Cadeler A/S
b)	LEI	9845008439EUED140282
4.1	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted
a)	Description of the financial instrument, type of instrument and identification code	Shares ISIN DK0061412772
b)	Nature of the transaction	Purchase of shares

c)	Price(s) and volume(s)		Price(s)	Volume(s)
			NOK 40.0341	9,830
			NOK 40.0200	5,899
d)	Aggregated information -    Aggregated volume -    Price	Average price per share: NOK 40.0288 Total number of shares: 15,729 shares Total price: NOK 629,613.1830
e)	Date of the transaction	21 November 2025
f)	Place of the transaction	Oslo Stock Exchange, XOSL

4.2	Details of the transaction(s): section to be repeated for (i) each type of instrument; (ii) each type of transaction; (iii) each date; and (iv) each place where transactions have been conducted
a)	Description of the financial instrument, type of instrument and identification code	Shares ISIN DK0061412772

b) Nature of the transaction Purchase of shares

c)	Price(s) and volume(s)		Price(s)	Volume(s)
			NOK 41.0000	7,684
			NOK 40.8000	5,791
			NOK 40.7600	3,075
d)	Aggregated information -    Aggregated volume -    Price	Average price per share: NOK 40.8854 Total number of shares: 16,550 shares Total price: NOK 676,653.8000
e)	Date of the transaction	24 November 2025
f)	Place of the transaction	Oslo Stock Exchange, XOSL

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: November 25, 2025	CADELER A/S
	(Registrant)
	By:	/s/ Mikkel Gleerup

	Name:	Mikkel Gleerup
	Title:	Chief Executive Officer

FAQ

What did Cadeler A/S (CDLR) announce in this Form 6-K?

Cadeler A/S announced that Niki Invest ApS, a person closely associated with board member Ditlev Wedell-Wedellsborg, made reportable purchases of Cadeler shares on the Oslo Stock Exchange, as required under EU Market Abuse Regulation rules.

How many Cadeler (CDLR) shares did Niki Invest ApS buy?

Niki Invest ApS bought a total of 32,279 Cadeler shares, consisting of 15,729 shares on 21 November 2025 and 16,550 shares on 24 November 2025.

At what prices were the Cadeler A/S shares purchased?

On 21 November 2025, shares were bought at prices of NOK 40.0341 and NOK 40.0200, giving an average of NOK 40.0288 per share. On 24 November 2025, shares were bought at NOK 41.0000, NOK 40.8000 and NOK 40.7600, with an average price of NOK 40.8854 per share.

What was the total cash value of the Cadeler (CDLR) share purchases?

The total cash value of the reported purchases was NOK 629,613.1830 on 21 November 2025 and NOK 676,653.8000 on 24 November 2025, based on the aggregated price and volume disclosed.

Where were the Cadeler A/S (CDLR) share transactions executed?

All reported transactions by Niki Invest ApS were executed on the Oslo Stock Exchange (XOSL) in Cadeler A/S shares with ISIN DK0061412772.

Why is this Cadeler A/S insider-related transaction being reported?

The transactions are reported because Niki Invest ApS is a closely associated person to a Cadeler board member, triggering disclosure under article 19 of Market Abuse Regulation (EU) no. 596/2014 for persons discharging managerial responsibilities and their closely associated persons.