As OpenAI and Anthropic both race toward blockbuster IPOs, there are not many investors who can claim the distinction of backing both companies early. Bradley Horowitz, through his venture firm, Wisdom Ventures, wrote early checks to OpenAI in 2023 and to Anthropic in 2024. He was also an angel investor in Cerebras, which soared in its public market debut last week. His other seed investments include Slack, Miro, Ramp, and ScaleAI, a remarkable track record that has made Horowitz a perennial