Tempus AI is trading 4.04% lower at $68.06, with the October 12 decline’s cause unclear. - No clear company-specific announcement or other catalyst surfaced in search results. - Accepted ESMO abstracts were recent company news, but the announcement predates this session and does not explain the decline. - The Nasdaq fell 0.34% and the S&P 500 fell 0.06%; neither declined more than 0.5%, leaving no established market-driven explanation.