Google also has around a 14% stake in Anthropic (as at 2025 [1]) and they participated in the "G" funding round [2]. Amazon has a significant stake in them too.

[1] https://www.nytimes.com/2025/03/11/technology/google-investm... , https://archive.md/f0BxC

[2] https://www.anthropic.com/news/anthropic-raises-30-billion-s...