The Equity Method Trap: How Microsoft’s OpenAI Investment Reveals the Fatal Architecture of Platform AI Economics

Nov 23, 2025

∙ Paid

When a 135 billion dollar stake becomes a liability measured in billions per quarter, you are not witnessing a partnership. You are witnessing the structural endgame of an entire economic model.

By Shanaka Anslem Perera.

On October 29th, 2025, Microsoft filed its quarterly 10-Q with the Securities and Exchange Commission. Embedded within the standard fina…