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Cover
Mar. 16, 2026
Cover [Abstract]  
Document Type 8-K/A
Amendment Flag false
Document Period End Date Mar. 16, 2026
Entity File Number 333-283139
Entity Registrant Name C1 Fund Inc.
Entity Central Index Key 0002044327
Entity Tax Identification Number 99-4570832
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 228 Hamilton Avenue
Entity Address, Address Line Two Third Floor
Entity Address, City or Town Palo Alto
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94301
City Area Code 650
Local Phone Number 374-7800
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.00001
Trading Symbol CFND
Security Exchange Name NYSE
Entity Emerging Growth Company false