{"id":1312,"date":"2026-06-08T10:53:11","date_gmt":"2026-06-08T10:53:11","guid":{"rendered":"https:\/\/mmchuck.com\/m\/?p=1312"},"modified":"2026-06-08T11:00:52","modified_gmt":"2026-06-08T11:00:52","slug":"if-the-bottom-90-of-stockholders-sold-everything-but-the-institutional-remained-neutral-without-selling-how-much-would-the-indexes-be-impacted","status":"publish","type":"post","link":"https:\/\/mmchuck.com\/m\/2026\/06\/08\/if-the-bottom-90-of-stockholders-sold-everything-but-the-institutional-remained-neutral-without-selling-how-much-would-the-indexes-be-impacted\/","title":{"rendered":"if the bottom 90% of stockholders sold everything but the institutional remained neutral without selling, how much would the indexes be impacted"},"content":{"rendered":"

If you would like to support me:<\/p>\n

Because the top 10% of wealthiest Americans and institutional investors control approximately 80-90% of the total equity market, the \u201cbottom 90%\u201d of stockholders hold a relatively small fraction of the total outstanding shares. If this bottom 90% completely liquidated their portfolios, it would trigger a sharp localized drop and high volatility, but market indexes (like the S&P 500 or Dow Jones) would not experience a permanent 90% crash. [1, 2, 3, 4]
\nHere is a breakdown of how the market and your indexes would react:
\n1. Market Mechanics and Price Impact<\/p>\n

\u2022 A Flood of Sell Orders: A mass exodus would flood the market with sell orders. Without corresponding buyers at current prices, market makers would aggressively lower the bids.
\n\u2022 The S&P 500 Drop: While the exact number fluctuates with the business cycle, large-cap indexes like the S&P 500
\nare heavily weighted toward the largest companies (like Apple, Nvidia, and Microsoft). Because most of these mega-cap shares are heavily held by institutions (institutions hold ~80% of S&P 500 market caps), a sell-off confined to the bottom 90% of individual investors wouldn\u2019t crash the heavyweights by 90%. The actual index drop would likely be much more moderate, determined by the market\u2019s specific pricing mechanism at the time of the flood.
\n\u2022 Price Gaps: Since the institutional investors remained neutral and refused to buy or sell, there would be a severe market imbalance. Stock prices would plunge to whatever level it took to finally match sellers with buyers, causing temporary, chaotic price gaps.<\/p>\n

2. Market-Wide Consequences<\/p>\n

\u2022 Extreme Illiquidity: Because institutional block traders\u2014like mutual funds and pension funds\u2014stayed on the sidelines and provided zero counterparty liquidity, trading in smaller, less liquid companies could virtually freeze up.
\n\u2022 Margin Calls and Contagion: A sudden crash among mid- and small-cap stocks would likely trigger algorithmic margin calls for larger leveraged investors. This could force some institutions to break their \u201cneutral\u201d stance and sell off mega-cap blue-chip stocks to cover their losses, which would drag the indexes down further.<\/p>\n

If you would like to explore this concept further, let me know:<\/p>\n

\u2022 Would you like to compare the ownership concentration between specific indexes (like the S&P 500 versus the Russell 2000)?
\n\u2022 Are you interested in the mathematical difference between market capitalization-weighted indexes and price-weighted indexes in this scenario?
\n\u2022 Would you like to know how different brokerages handle liquidity freezes during massive sell-offs?<\/p>\n

AI responses may include mistakes.<\/p>\n

[1]\u00a0https:\/\/www.youtube.com\/watch?v=T5E7Ow-U3qg
\n[2]\u00a0https:\/\/www.pionline.com\/article\/20170425\/INTERACTIVE\/170429926\/80-of-equity-market-cap-held-by-institutions\/
\n[3]\u00a0https:\/\/www.facebook.com\/RBReich\/posts\/the-top-10-of-richest-americans-own-87-of-stocks-the-top-1-alone-own-roughly-hal\/1448838773276232\/
\n[4]\u00a0https:\/\/www.youtube.com\/shorts\/2S4u7qJMXwg
\n[5]\u00a0https:\/\/www.aesinternational.com\/blog\/what-would-happen-if-everyone-invested-in-index-funds
\n[6]\u00a0https:\/\/www.reddit.com\/r\/Burryology\/comments\/1jkm9zh\/retail_investors_ploughing_into_the_markets_at\/
\n[7]\u00a0https:\/\/paperandblocks.com\/2024\/01\/15\/david-vs-goliath-when-advantage-tilts-toward-retail-investors\/
\n[8]\u00a0https:\/\/manhattan.institute\/article\/who-owns-the-stock-market-its-not-just-the-wealthy
\n[9]\u00a0https:\/\/bookmap.com\/blog\/the-impact-of-block-trades-on-stock-prices-what-retail-traders-should-know
\n[10]\u00a0https:\/\/medium.com\/illumination\/the-liquidity-illusion-what-every-investor-must-understand-about-market-collapse-99f3746dd3da<\/p>\n

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\nIf you would like to support me:<\/p>\n

https:\/\/mmchuck.com\/m\/how-tip-me\/<\/a><\/p>\n

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