SCHEDULE 13G/A 0001535264 XXXXXXXX LIVE 4 Common Stock, Par Value $0.01 12/31/2025 0000911147 CENTURY CASINOS INC /CO/ 156492100 455 E. PIKES PEAK AVE SUITE 210 COLORADO SPRINGS CO 80903 Rule 13d-1(b) AWM Investment Company, Inc. DE 770508.00 0.00 770508.00 0.00 770508.00 2.6 IA AWM Investment Company, Inc., a Delaware corporation (AWM), is the investment adviser to Special Situations Cayman Fund, L.P. (CAYMAN), Special Situations Fund III QP, L.P. (SSFQP) and Special Situations Private Equity Fund, L.P. (SSPE). As the investment adviser to the Funds, AWM holds sole voting and investment power over 124,226 Common Shares held by CAYMAN, 433,478 Common Shares held by SSFQP and 212,804 Common Shares held by SSPE. CENTURY CASINOS INC /CO/ 455 E. PIKES PEAK AVE, SUITE 210, COLORADO SPRINGS, COLORADO, 80903 The person filing this report is AWM Investment Company, Inc., a Delaware corporation (AWM), which is the investment adviser to Special Situations Cayman Fund, L.P., a Cayman Islands Limited Partnership (CAYMAN), Special Situations Fund III QP, L.P., a Delaware limited partnership (SSFQP) and Special Situations Private Equity Fund, L.P., a Delaware limited partnership (SSPE). The principal business of each Fund is to invest in equity and equity-related securities and other securities of any kind or nature. David M. Greenhouse (Greenhouse) and Adam C. Stettner (Stettner) are members of: SSCayman, L.L.C., a Delaware limited liability company (SSCAY), the general partner of CAYMAN; MGP Advisers Limited Partnership, a Delaware limited partnership (MGP), the general partner of SSFQP and MG Advisers, L.L.C., a New York limited liability company (MG), the general partner of SSPE. Greenhouse and Stettner are also controlling principals of AWM. 527 Madison Avenue, Suite 2600 New York, NY 10022 AWM is a Delaware Corporation N 770,508 4.1 AWM is the investment adviser to each of the Funds. As the investment adviser to the Funds, AWM holds sole voting and investment power over 124,226 shares of Common Stock of the Issuer (the Shares) held by CAYMAN, 433,478 Shares held by SSFQP and 212,804 Shares held by SSPE. Greenhouse and Stettner are members of: SSCAY, the general partner of CAYMAN. Greenhouse and Stettner are members of MGP, the general partner of SSFQP and MG, the general partner of SSPE. Greenhouse and Stettner are also controlling principals of AWM. 0 AWM is the investment adviser to each of the Funds. As the investment adviser to the Funds, AWM holds sole voting and investment power over 124,226 shares of Common Stock of the Issuer (the Shares) held by CAYMAN, 433,478 Shares held by SSFQP and 212,804 Shares held by SSPE. Greenhouse and Stettner are members of: SSCAY, the general partner of CAYMAN. Greenhouse and Stettner are members of MGP, the general partner of SSFQP and MG, the general partner of SSPE. Greenhouse and Stettner are also controlling principals of AWM. 0 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. AWM Investment Company, Inc. Adam Stettner 02/13/2026