Per Anthropic's S-1, Amazon holds convertible notes with $6.2B principal outstanding (Anthropic's entire debt load), which Amazon's own filings valued at $97.9B as of June 30. They could convert into up to 1.84B shares.
No VC firm holds 5% (Menlo's roughly $14B position is about 1.5% at the $965B private valuation). The notes' rising fair value drove a $72.4B non-cash charge in H1 2026.