What Are 13F Filings?
SEC 13F filings are quarterly reports filed by institutional investment managers with over $100 million in qualifying assets. They disclose US equity positions, making them one of the best public sources for tracking hedge fund holdings and top investor portfolios.
This is how we know what Warren Buffett, Ray Dalio, Stanley Druckenmiller, and other legendary investors are buying and selling each quarter. A good 13F portfolio tracker turns raw filing tables into holdings, weights, top buys, top sells, and quarter-over-quarter changes.
Who Must File?
π‘ 13F Filing Requirements
- Any institutional investment manager with $100M+ in qualifying assets
- Includes hedge funds, mutual funds, pension funds, insurance companies
- Must be filed within 45 days of quarter end (Feb 14, May 15, Aug 14, Nov 14)
- Only covers US-listed equities and certain options β no bonds, private investments, or shorts
- Amendments can be filed later if errors are found
How to Read a 13F
| Field | Meaning | Example |
|---|---|---|
| Name of Issuer | Company name | Apple Inc |
| Title of Class | Security type | Common Stock |
| CUSIP | Unique security ID | 037833100 |
| Value (Γ$1000) | Position value in thousands | $157,890,000 = $157.9B |
| Shares | Number of shares held | 905,560,000 |
| Investment Discretion | Who decides | SOLE = full control |
Limitations and Pitfalls
π‘ What 13F Doesn't Show
- 45-day lag β by the time you see it, the information is 6 weeks old
- No short positions β you only see longs, missing the full picture
- No bonds or private investments β only US-listed equities
- No position sizing context β is it a core position or a hedge?
- Confidential treatment β managers can request SEC hide certain positions temporarily
How to Track Hedge Fund Holdings with 13F Data
Despite limitations, 13F data is enormously valuable when used correctly. The key is to compare portfolio changes across multiple quarters and across multiple managers, rather than treating one static holdings list as a buy signal.
π‘ Effective 13F Analysis
- Track conviction β look for positions being ADDED to, not just held
- New positions matter β a fresh buy signals current confidence
- Look for consensus β when multiple top investors buy the same stock, pay attention
- Compare quarter-over-quarter β changes matter more than snapshots
- Use as idea generation β don't copy blindly, but research their picks
"Don't just look at what they hold. Look at what they're adding. New money reveals current conviction."
π‘ 13F Guide β Key Summary
- 13F filings reveal quarterly holdings of $100M+ institutional investors
- Filed 45 days after quarter end β significant information lag
- Only covers US equities β no shorts, bonds, or private investments
- Best use: track conviction changes (additions), not static holdings
- Multiple smart money investors buying the same stock = strong signal
- Use Whale Analyzer to automate the analysis across 100+ investors and stock ownership pages