Claude aids stock analysis but cannot replicate 21.8% annual returns, investigation finds

Claude’s role in the process was limited to organizing corporate filings (e.g., summarizing securities reports from Japan’s EDINET) and creating structured memos for investment decisions. While Claude can extract data from PDFs and flag inconsistencies, it cannot guarantee accuracy—misinterpreted units (e.g., 12,500 million yen vs. 12.5 billion yen) or misaligned accounting terms (e.g., operating profit vs. net income) risk errors. The post’s method of setting price thresholds for purchases also proved risky, as external shocks (e.g., scandals) could invalidate prior analysis. The investigation concluded Claude enhances due diligence but does not replace human judgment or replicate elite performance. The author noted stock investing differs from AI side hustles (e.g., content creation) due to principal risk and unrealized gains, making it unsuitable for stable monthly income goals like the series’ ¥10,000/month target.