They all own portions of every company and together they all own over 50% in so many things that they have a controlling vote in a majority of board rooms.

Thanks for the clarification. If you do find the article I'd be curious because if I check the

• total market cap, it's roughly $100T (just order of magnitude) cf e.g. https://en.wikipedia.org/wiki/List_of_countries_by_stock_market_capitalization whereas
• Vanguard $10T AUM
• BlackRock $10T AUM
• State Street Corporation $5T AUM
• Fidelity $5T AUM
• Charles Schwab Corporation $10T AUM

and others https://en.wikipedia.org/wiki/List_of_asset_management_firms whereas sovereign wealth funds https://en.wikipedia.org/wiki/Sovereign_wealth_fund#Largest_sovereign_wealth_funds are only up to $2T.

So... if I do roughly the sum of AUM I don't even get to half of $100T. Maybe they have controlling shares (to define here because not sure I understanding correctly, i.e. single seat on board vs majority of seats in order to actual control) somehow in the US with a total valuation under $50T but somehow overall I don't see how. Also together would mean some kind of coordination, which I'm not saying is impossible but beside generating more money I'm not sure they have a "goal" that would imply using said control.