Few VC firms are mentioned in Anthropic's S-1, except Spark, which invested ~$800M across six rounds and whose GP Yasmin Razavi is the sole VC on its board (Kate Clark/Wall Street Journal)

Spark Capital is the only venture capital firm named in Anthropic's S-1 filing, having invested approximately $800 million across six funding rounds, with general partner Yasmin Razavi serving as the sole VC representative on its board.