How to Read a 13F Filing (Step by Step, With an Example)
To read a 13F filing, first confirm which quarter it covers, then compare each position’s share count with the previous quarter’s filing, and only then look at value and portfolio weight. Share counts tell you what the manager did; dollar values mostly tell you what the market did.
The 5-step checklist
- Check the period of report (quarter-end date) and the filing date.
- Find the total reported value on the summary page.
- Compute each position’s % of the reported portfolio.
- Compare share counts with the prior quarter: new, increased, reduced, unchanged or sold out.
- Look for options, multiple share classes and amendments before drawing conclusions.
Step 1: Know which quarter you are looking at
Every 13F shows two different dates, and mixing them up is the most common mistake:
- Period of report — the quarter-end date the holdings refer to (for example, September 30, 2026).
- Filing date — when the manager submitted it to the SEC, up to 45 days later.
Holdings in a filing dated November 14 describe the portfolio on September 30. Anything the manager did after that date is not in the report. During filing season, different managers will show different quarters at the same time, which is why Clear13F labels the quarter on every row.
Step 2: Find the total reported value
The summary page lists the information table value total. It is the market value of the reported Section 13(f) securities only — not the manager’s total assets, and not the fund’s performance.
Step 3: Compute % of portfolio
% of portfolio = value of the position ÷ total reported value. A position worth $13 million in a $200 million 13F portfolio is 6.5%. This is the best quick signal of conviction, but remember the denominator excludes cash, shorts and anything that is not a 13(f) security.
Step 4: Compare share counts with the previous quarter
A single 13F is a snapshot. To see activity, you need two consecutive filings. Here is a hypothetical example for an imaginary “Fund X”:
| Stock | Shares at Q1 end | Shares at Q2 end | How to label it |
|---|---|---|---|
| ABC | 100,000 | 130,000 | ▲ Increased 30% |
| DEF | — | 50,000 | New position |
| GHI | 80,000 | 60,000 | ▼ Reduced 25% |
| JKL | 40,000 | — | Sold out |
| MNO | 25,000 | 25,000 | Unchanged |
Swipe the table to see all columns.
Two cautions: an “increase” only means the share count was higher at quarter-end — it does not tell you when during the quarter the shares were bought, or at what price. And a position can be bought and fully sold within one quarter without ever appearing in a 13F.
Step 5: Watch for the five classic misreadings
1. Value changes are not trades
If a position’s value rose 20% but the share count did not change, the stock price rose — the manager did nothing.
2. The implied price is not the purchase price
Value ÷ shares gives a price close to the quarter-end market price. It is not what the manager paid. 13F filings never report purchase prices.
3. Options can distort the picture
Options held (puts or calls) are reported using the underlying shares and their value, which can make a small options bet look like a huge stock position. A put may be a hedge, not a bearish bet. Options the manager wrote are not reported at all.
4. One company, several lines
The same issuer can appear on several lines — different share classes (Alphabet GOOGL and GOOG, Berkshire A and B), options, or holdings split by investment discretion. Add them up before judging the size of the bet.
5. Amendments and confidential positions
A later 13F-HR/A can correct a filing or add positions the SEC had allowed the manager to keep confidential for a period. Always check whether an amendment exists for the quarter. Details in What 13F filings don’t show.
Putting it together
A solid reading sounds like this: “As of June 30, the manager held 130,000 shares of ABC, up 30% from March 31; ABC is now 6.5% of its reported 13F portfolio.” It names the date, the change in shares and the weight — and makes no claim about timing or price that the filing cannot support.
Sources: SEC Form 13F FAQ (questions on options, aggregation and amendments; accessed November 6, 2026). The Fund X table is a hypothetical illustration. Educational content, not investment advice.