v3.26.1
Cover
Aug. 06, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 05, 2026
Entity File Number 001-43191
Entity Registrant Name Pono Capital Four, Inc.
Entity Central Index Key 0002108164
Entity Tax Identification Number 00-0000000
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One Suite 210
Entity Address, Address Line Two 2nd Floor Windward III
Entity Address, Address Line Three Regatta Office Park
Entity Address, City or Town Grand Cayman
Entity Address, Country KY
Entity Address, Postal Zip Code 00000
City Area Code 206
Local Phone Number 923-9234
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
[custom:EntityAddressAddressLine4] PO Box 500
Units, each consisting of one Class A ordinary share and one right to receive one-fifth of one Class A ordinary share  
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one right to receive one-fifth of one Class A ordinary share
Trading Symbol PONOU
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 PONO
Security Exchange Name NASDAQ
Share rights, to receive one-fifth of one Class A ordinary share  
Title of 12(b) Security Share rights, to receive one-fifth of one Class A ordinary share
Trading Symbol PONOR
Security Exchange Name NASDAQ