The approach here is specific. Anthropic is private, and most public companies that hold a stake in it are so large that even a multi-billion dollar position barely registers against their market cap. Amazon holds roughly $29 billion in Anthropic equity. That sounds significant until you note it represents about 1.3% of a $2.2 trillion company. An Anthropic IPO at a $500 billion valuation would move Amazon's stock by a fraction of a percent. The same logic applies to Alphabet, Nvidia, and Microsoft.
The only vehicles where an Anthropic stake actually moves the needle in a material way are thos