This guide is for educational purposes only and does not constitute investment advice. Data sourced from SEC EDGAR filings. Past performance is not indicative of future results. Consult a qualified financial advisor before making investment decisions.
How to Read Institutional Ownership Data (13F)
Large investment firms must publicly disclose what they own every quarter. These filings can look like walls of numbers at first, but they tell a surprisingly clear story about who believes in a company — and who's walking away.
What is a 13F Filing?
SEC Form 13F is a quarterly report that institutional investment managers with at least $100 million in assets under management (stocks, bonds, and similar securities) must file. It lists every long equity position they hold, including the number of shares and market value.
These filings are publicly available through SEC EDGAR and provide a window into what the world's largest investors are buying and selling.
Key Facts
- --Filed quarterly, within 45 days of quarter-end
- --Only long equity positions are disclosed (no shorts or options)
- --Applies to managers with $100M+ in qualifying assets
- --Billiver tracks the top 500 institutional holders by AUM
Types of Institutional Investors
Not all institutional investors are alike. Understanding the type of institution helps you gauge how much a position change actually means.
Index Funds (Vanguard, BlackRock, State Street)
These hold stocks because they're in an index (like the S&P 500), not because of active analysis. Their holdings reflect index composition rather than investment conviction. If a stock is in the S&P 500, Vanguard will own it.
Hedge Funds
Active managers who make deliberate buy/sell decisions. Their position changes are more likely to reflect research and conviction. However, 13F only shows long positions -- hedge funds may have short positions or options that offset what you see.
Mutual Funds and Pension Funds
Actively managed funds that research and select holdings. Their position changes generally reflect fundamental analysis, but may also be driven by fund flows (investor deposits or withdrawals).
Reading the Holdings Table
On Billiver, each company page shows a table of institutional holders. Here's what each column means:
| Column | What It Means |
|---|---|
| Investor Name | The institution. Click to see their full portfolio. |
| Holdings Value | Market value of their position as of the filing date. |
| Shares | Number of shares held. |
| % of Portfolio | How much of the investor's total portfolio this position represents. Higher % = stronger conviction. |
| Change | NEW (first-time position), INCREASED, DECREASED, or SOLD (exited entirely). |
What to Look For
New Positions from Active Managers
When a respected active manager (not an index fund) opens a new position, it indicates they've done research and see value. This is more significant than Vanguard increasing a position.
Portfolio Concentration
If a stock is 5-10% of a fund's total portfolio, that's a high-conviction position. If it's 0.01%, it's a minor holding and less meaningful.
Widespread Selling
If multiple active managers reduce or exit positions in the same quarter, it may indicate shared concerns about the company. However, this data is already 45+ days old by the time you see it.
Limitations of 13F Data
45-day delay
Institutions have up to 45 days after quarter-end to file. By the time you see the data, positions may have already changed.
Long positions only
13F filings do not include short positions, put options, or other bearish bets. An institution might appear bullish (large long position) while simultaneously holding shorts.
Snapshot, not real-time
13F shows holdings at quarter-end. The fund may have bought and sold multiple times during the quarter without it appearing in the filing.
Data source: SEC EDGAR 13F filings. Billiver tracks the top 500 institutional investors by assets under management.
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This content is for educational purposes only and does not constitute investment advice. Always consult with a qualified financial advisor for personalized guidance.