Welcome to Bull Street Buzz — Tuesday, October 7th 2025, 6:15pm — OpenAI DevDay live: Altman keynote announces Apps SDK, AgentKit, ChatKit and Codex - CNBC — AppLovin stock tanks on report SEC is investigating company over data-collection practices - CNBC — Amgen Stock (AMGN) Falls as It Cuts 60% Off Cholesterol Drug Price, Heeding Trump’s Clamor - TipRanks — S&P 500 rises to start week, AMD lifts the Nasdaq: Live updates - CNBC — Dow Jones Today: Stocks Mostly Advance to Begin Week; Nasdaq Hits New High as AMD Soars on OpenAI Deal; Gold, Bitcoin Trade at Records - Investopedia