Given that it's being done through xAI, it seems reasonable to think that most parties from December's series C would also at least entertain the idea:
> A16Z, Blackrock, Fidelity Management & Research Company, Kingdom Holdings, Lightspeed, MGX, Morgan Stanley, OIA, QIA, Sequoia Capital, Valor Equity Partners and Vy Capital, amongst others. Strategic investors NVIDIA and AMD also participated and continue to support xAI in rapidly scaling our infrastructure.
> A16Z, Blackrock, Fidelity Management & Research Company, Kingdom Holdings, Lightspeed, MGX, Morgan Stanley, OIA, QIA, Sequoia Capital, Valor Equity Partners and Vy Capital, amongst others. Strategic investors NVIDIA and AMD also participated and continue to support xAI in rapidly scaling our infrastructure.
From: https://x.ai/blog/series-c