Institutional holdings
How to Read a 13F Filing: Shares, Value and Timing
A 13F filing helps you investigate reported institutional holdings. It does not tell you what a manager is buying today. To read it usefully, separate three questions: When was the position measured? How many securities were reported? What does the reported value actually represent?
Start with the reporting period
Institutional investment managers with at least $100 million in qualifying securities (“Section 13(f) securities”) file Form 13F after each calendar quarter. The report describes reportable holdings at the quarter end and is due within 45 days, moved to the next business day when the deadline falls on a weekend or holiday. Because the next report is not due until 45 days after the following quarter ends, the latest filing available on a given day can describe holdings that are more than four months old. Short positions are not reported, securities that trade only on non-US exchanges are left out, and the form is not a complete picture of every asset or hedge. SEC Form 13F FAQ
Put the reporting period beside the filing date in your notes. A headline dated today can describe an older snapshot. Before researching the company, decide whether that snapshot is recent enough for the question you are asking.
For example, “Why did this position appear in the latest reported quarter?” is a narrower, answerable starting point than “What is this manager buying right now?”
Separate share count from market value
The information table distinguishes issuer, security class, shares or principal amount, and value. Reported value uses the closing price on the last trading day of the quarter; it is not the manager's purchase cost. Form 13F instructions, Special Instruction 8
Reports filed on or after January 3, 2023 round values to the nearest dollar; earlier reports rounded to the nearest thousand dollars. Check units before comparing older filings or third-party displays. SEC Form 13F FAQ, Question 62
Here is a hypothetical common-stock example, assuming the same security and no split or other corporate action:
| Measurement | Earlier quarter | Later quarter |
|---|---|---|
| Shares reported | 100 | 100 |
| Quarter-end price | $10 | $12 |
| Reported market value | $1,000 | $1,200 |
The position's reported value rose 20%. The share count did not change. These two snapshots alone do not support “the manager bought 20% more stock.” They also cannot rule out offsetting transactions between the snapshots.
Dividing $1,200 by 100 produces $12, the valuation price in this simplified example. It does not recover the manager's entry price. A cost estimate would require additional evidence and assumptions, which should be identified separately.
Compare two filings with a short worksheet
Find the manager through the SEC's EDGAR company search. Open the underlying filing and information table instead of relying only on a screenshot or ranking page. Then use this reading workflow:
If you are still choosing a person or institution to research, start with OpenBit's people and filings page. Keep the original filing as the reference for any comparison you make.
| Check | What to write down |
|---|---|
| Identity | Manager name and identifier, plus the original filing link |
| Timing | Reporting period and filing date, recorded separately |
| Version | Whether you are reading an original report or an amendment |
| Security | Issuer, class and identifier; keep common shares and option entries separate |
| Comparison | Share-count change and value change in separate columns |
| Context | Corporate actions, changed reporting scope or other issues needing investigation |
| Unknowns | Questions the two snapshots cannot answer |
Do not automatically combine rows with similar company names. First establish that they represent comparable securities and reporting scope. If that is unclear, label the comparison unresolved rather than filling the gap with a confident story.
What can you conclude?
Does a 13F show purchase price? The value column is not a cost-basis column. In the example above, the calculation reveals a snapshot valuation, not an execution price.
Does a larger reported position establish bullish conviction? Treat it as a reason to investigate. Your explanation of the manager's motive is a hypothesis unless you have separate evidence.
Can you calculate portfolio weight? You can calculate a share of the reported table's value, but label the denominator clearly. “Percentage of reported 13F value” is a more precise description than “percentage of the manager's entire portfolio.”
Turn the observation into a research question
A useful note might read:
In the two comparable snapshots I checked, the reported share count was unchanged while market value increased. I have not established the manager's purchase cost or current position. My next question is whether the company's business evidence changed over the same period.
That note preserves what you observed and what you still need to learn. Continue with the company's disclosures and the evidence for your own research question. Keep the filing link beside your note so someone else can check the same record.
Continue your research with OpenBit
Take the company behind the disclosed holding to OpenBit's stock research page. Start with a business question: “What evidence supports the company's growth outlook, and what could weaken that view?” Keep your conclusion separate from the manager's reported position.
To record what you learn, use our investment thesis tracking template. It gives you a place to save the claim, supporting evidence and next check.