GLOSSARY // Fundamentals
Institutional Ownership
Institutional ownership is the percentage of a company's shares held by institutions: mutual funds, hedge funds, pensions, banks, and insurers, tallied mostly from quarterly 13F filings. Large-cap US names typically run 70-90% institutional; microcaps can sit below 20%.
The number cuts both ways. High institutional ownership means professional diligence has been done and liquidity is deep, but it also means the marginal buyer may already be in. Low institutional ownership in a small name leaves room for funds to build positions, and it is one reason low-float stocks move so violently: there is no institutional inventory to absorb retail order flow.
Stock A, a $40B industrial, shows 84% institutional ownership across 1,200 filers; a fund selling 1% of the company barely dents the tape. Stock B, a $150M biotech at 11% institutional ownership with a 9M-share float, jumps 60% in a day on trial data because the only sellers are retail holders and the first institution trying to build a 5% stake must buy 750,000 shares from them.
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Educational only — not financial advice. Definitions simplified for clarity; markets are messier than definitions.