According to the company's confidential IPO S-1 prospectus filing revealed in October 2026 that Reuters reported on. https://www.reuters.com/business/finance/anthropics-ipo-pros...

I haven't seen the confidential prospectus and haven't read reports on whether it is based on secondary market value, but it is mostly stock. His base salary was only $1.4m in 2025, but doubled in 2026.