Supporting materials for "What Your AI Assistant Infers About You: Personality Profiling and Its Security Implications"

Supporting materials for a study in which 160 users of memory-enabled AI assistants completed the IPIP-NEO-60 personality questionnaire and then prompted their own assistant to predict their answers. The manuscript compares the two sets of answers, examines the person-specific information in the assistant's profile and reports how participants reacted to seeing it. The record contains (1) every table and figure of the manuscript as CSV files with de-identified aggregate results, (2) the analysis scripts, one per manuscript result, with a verification report, and (3) the exact prompt and item set that participants copied into their assistant. The participant-level data are not part of this record. Participants consented to take part in the study but not to public release of their responses, and the data include sensitive personal attributes. De-identified participant-level data can be made available to journal editors and reviewers for verification under a confidentiality agreement. The study received a positive opinion from the Ethics Committee of FESB, University of Split (13 July 2026, Class 029-01/26-01/019). This work was supported by the European Union - NextGenerationEU through the Croatian National Recovery and Resilience Plan 2021-2026, via the University of Split institutional project ZIDI under Grant IP-UNIST-13.