v3.26.1
Document and Entity Information
 12 Months Ended
Dec. 31, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2025
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-41709
Entity Registrant Name SEALSQ Corp
Entity Incorporation, State or Country Code D8
Entity Address, Address Line One Avenue Louis-Casaï 58
Entity Address, Postal Zip Code 1216
Entity Address, City or Town Cointrin
Entity Address, Country CH
Title of 12(b) Security Ordinary Shares, par value USD 0.01 per share
Trading Symbol LAES
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 191,525,129
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period true
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard U.S. GAAP
Entity Shell Company false
Entity Central Index Key 0001951222
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Amendment Flag false
Auditor Name BDO Ltd
Auditor Location Zurich, Switzerland
Auditor Firm ID 5988
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One Craigmuir Chambers, Road Town
Entity Address, Postal Zip Code 1110
Entity Address, City or Town Tortola
Entity Address, Country VG
Contact Personnel Name John O’Hara
Country Region 41
City Area Code 22
Local Phone Number 594-3000
Contact Personnel Fax Number 594-3001