X0202 SCHEDULE 13G/A 0001446580-26-000037 0001446580 XXXXXXXX LIVE 1 Ordinary Shares, USD 0.01 par value per share 03/31/2026 0001951222 SEALSQ Corp 81752W108 Avenue Louis-Casai 58 Cointrin V8 1216 Rule 13d-1(b) Susquehanna Securities, LLC DE 12134793 12134793 12134793 12134793 12134793 5.4 BD OO SEALSQ Corp Avenue Louis-Casai 58, CH-1216 Cointrin, Switzerland This statement is filed by Susquehanna Securities, LLC, who is referred to herein as the "Reporting Person" with respect to the Ordinary Shares, USD 0.01 par value per share (the "Shares"), of SEALSQ Corp (the "Company"). The address of the principal business office of the Reporting Person is: 401 E. City Avenue Suite 220 Bala Cynwyd, PA 19004 Citizenship is set forth in Row 4 of the cover page for the Reporting Person and is incorporated herein by reference. N BD The information required by this Item 4(a) is set forth in Row 9 of the cover page for the Reporting Person and is incorporated herein by reference. The number of Shares reported as beneficially owned by the Reporting Person includes options to buy 10,814,300 Shares. The Company's Annual Report on Form 20-F, filed on March 31, 2026, indicates there were 222,773,999 Shares outstanding as of March 27, 2026. 5.4 The information required by this Item 4(c)(i) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference. The information required by this Item 4(c)(ii) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference. The information required by this Item 4(c)(iii) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference. The information required by this Item 4(c)(iv) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference. Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Susquehanna Securities, LLC /s/ Brian Sopinsky 05/13/2026