v3.25.4
Cover
Jan. 30, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Jan. 30, 2026
Entity File Number 001-42607
Entity Registrant Name DUNE ACQUISITION CORPORATION II
Entity Central Index Key 0002041047
Entity Tax Identification Number 00-0000000
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 700 S. Rosemary Avenue
Entity Address, Address Line Two Suite 204
Entity Address, City or Town West Palm Beach
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33401
City Area Code 917
Local Phone Number 742-1904
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Units, each consisting of one Class A ordinary share and three-quarters of one redeemable warrant  
Title of 12(b) Security Units, each consisting of one Class A ordinary share and three-quarters of one redeemable warrant
Trading Symbol IPODU
Security Exchange Name NASDAQ
Class A ordinary shares, par value $0.0001 per share  
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share
Trading Symbol IPOD
Security Exchange Name NASDAQ
Warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share  
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share
Trading Symbol IPODW
Security Exchange Name NASDAQ