At last year's San Francisco Tech Week, OpenAI was valued at a mere $157 billion, and there was unease about whether tech had truly left the doldrums of the post-COVID downturn behind. "Founders + Funders Cruise: Angels above the Bay" at SF Tech Week 2025. Andreessen Horowitz first hosted SF Tech Week in 2022, mostly to serve as a marketing vehicle for the mega venture firm more commonly known as a16z. "Many questioned why we wanted to do SF Tech Week at all! This time, with over 1500 events, San Francisco's tech week is the biggest of the three.