RT dataset T1 Reduced Information, Inflated Confidence: Experimental Evidence A1 Cuesta López, Miguel A1 Rodríguez Sanz, Juan Antonio A1 Vallelado González, Eleuterio A2 Universidad de Valladolid. Facultad de Ciencias Económicas y Empresariales K1 Behavioral finance K1 5312.06 Finanzas y Seguros AB This dataset is supplementary material for the paper 'Reduced Information, Inflated Confidence: Experimental Evidence from Investors’. It has not been previously published or deposited elsewhere and will be presented for the first time in October 2025. YR 2026 FD 2026-04-13 LK https://uvadoc.uva.es/handle/10324/84026 UL https://uvadoc.uva.es/handle/10324/84026 LA eng NO Departamento de Economía Financiera y Contabilidad. GIR Finanzas y Contabilidad. GIR: Finanzas y Contabilidad NO APPENDIX I – Answers template (first part - overconfidence). APPENDIX II – List of questions about overconfidence. APPENDIX III – Available information about the companies. APPENDIX IV – List of events and interpretation. APPENDIX V – Individual Performances (IPs) and partial ACCs and PCCs. APPENDIX VI – Determination of the rationality unknown variables. APPENDIX VII – Pearson Correlation Coefficients of the studied variables. APPENDIX VIII – Answers template (second part – rationality). APPENDIX IX – Evolution of share market prices (by group) DS UVaDOC RD 15-abr-2026