6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 6-K

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REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16 or 15d-16

of the Securities Exchange Act of 1934

May 5, 2026

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NOVO NORDISK A/S

(Exact name of Registrant as specified in its charter)

Novo Allé 1

DK- 2880, Bagsvaerd

Denmark

(Address of principal executive offices)

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

Novo Nordisk A/S – Share repurchase programme

Bagsværd, Denmark, 5 May 2026– On 4 February 2026, Novo Nordisk initiated a share repurchase programme in accordance with Article 5 of Regulation No 596/2014 of the European Parliament and Council of 16 April 2014 (MAR) and the Commission Delegated Regulation (EU) 2016/1052 of 8 March 2016 (the "Safe Harbour Rules"). This programme is part of the overall share repurchase programme of up to DKK 15 billion to be executed during a 12-month period beginning 4 February 2026.

Under the programme initiated 4 February 2026, Novo Nordisk will repurchase B shares for an amount up to DKK 3.8 billion in the period from 4 February 2026 to 4 May 2026. The programme is now concluded.

Since the announcement 27 April 2026, the following transactions have been made:

The details for each transaction made under the share repurchase programme are published on novonordisk.com.

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With the transactions stated above, Novo Nordisk owns a total of 32,148,978 B shares of DKK 0.10 as treasury shares, corresponding to 0.7% of the share capital. The total amount of A and B shares in the company is 4,465,000,000 including treasury shares.

Novo Nordisk expects to repurchase B shares for an amount up to DKK 15 billion during a 12- month period beginning 4 February 2026. As of 4 May 2026, Novo Nordisk has since 4 February 2026 repurchased a total 14,759,179 B shares at an average share price of DKK 257.47 per B share equal to a transaction value of DKK 3,799,999,990.

NovoNordisk is a leading global healthcare company founded in 1923 and headquartered in Denmark. Our purpose is to drive change to defeatserious chronic diseases built upon our heritage in diabetes. We do so by pioneering scientific breakthroughs, expanding access to ourmedicines and working to prevent and ultimately cure disease. Novo Nordisk employs about 68,800 people in 80 countries and markets itsproducts in around 170 countries. Novo Nordisk's B shares are listed on Nasdaq Copenhagen (Novo-B). Its ADRs are listed on the New YorkStock Exchange (NVO). For more information, visit novonordisk.com, Facebook, Instagram, X, LinkedIn and YouTube.

Contactsfor further information

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 of the undersigned, thereunto duly authorized.