Insider and Institutional Ownership13F
Insider ownership is the share of a company held by its executives and directors; institutional ownership is the share held by funds, pension plans and other institutions. In the US, large holders and insiders must report positions and trades in public filings.
Ownership structure describes who owns a company's shares: insiders such as executives and directors, institutions such as funds and pension plans, and the wider public. In the US, insiders and large holders must report positions and trades in public filings. Disclosure thresholds and rules differ by country.
- Category
- Fundamentals and Macroeconomics
- Reading time
- 4 min
- Also called
- Ownership structure, Insider ownership, Institutional ownership
- Updated
Ownership structure in plain words
In the US, insiders — officers, directors and anyone owning more than 10% of a class of the company's securities — must report their purchases, sales and holdings on Forms 3, 4 and 5.1
Crossing 5% ownership of a share class generally triggers a Schedule 13D filing, due to the SEC within five business days.2
Anyone, institution or not, who ends up owning more than 5% of a registered voting class must file a Schedule 13D with the SEC.3
Large money managers report too: those managing $100 million or more in qualifying US securities file Form 13F.4
How to check who owns a company
Search EDGAR
Look up 13D and 13G filings for most listed companies in the SEC's EDGAR database.3
Read insider filings
Check Forms 3, 4 and 5 for insiders' trades and holdings.1
Find 5% holders
Above five percent of a voting class, holders must file a Schedule 13D with the SEC.3
Note passive holders
Expect some large holders to file the shorter Schedule 13G instead of a 13D.3
Review 13F reports
Read 13F filings to see what managers with $100 million or more of qualifying securities hold.4
Compute percentages
Divide each holder's shares by shares outstanding.
Worked examples
Example 1 — Insider stake
Aligned incentivesHypothetical executives and directors own 12 million of 100 million shares.
| Insider ownership | 12% |
Because they are officers and directors, they report holdings by filing Forms 3, 4, and 5.1
Example 2 — Activist arrives
Market noticesA hypothetical fund buys 6% of the voting shares and plans to push for board changes.
| Stake | 6% |
| Filing | Schedule 13D |
Going above 5% of a voting class triggers a Schedule 13D.3
Example 3 — Insider selling
Watch closelyHypothetical Form 4 filings show the CEO selling 40% of their shares over three months.
| CEO stake before | 2.0m shares |
| After | 1.2m shares |
Insiders must report purchases, sales, and holdings, so the sales are public; the reason still needs checking.1
Insider vs institutional ownership
| Aspect | Insider ownership | Institutional ownership |
|---|---|---|
| Who | Officers, directors, 10%+ holders | Funds, pensions, insurers |
| Main US filings | Forms 3, 4, 5 | Form 13F, Schedules 13D/13G |
| Signal | Management alignment | Professional demand |
| Risk | Entrenchment | Crowded selling |
Where ownership data is used
Governance checks
High insider control can limit outside voice.
Activist tracking
New 13D filers can lead to price Price Gap moves.
Liquidity
Concentrated holders affect Liquidity and Short Interest dynamics.
Sentiment
Insider buying is part of Fundamental Analysis.
Advantages and disadvantages
Advantages
- Shows who has influence.
- Insider trades are public.
- Large stake changes are disclosed.
- Helps spot activists early.
Disadvantages
- 13F data are delayed.
- Filings do not explain motives.
- Insider sales are often routine.
- Rules differ by country.
Going deeper
Read as far as you need. Each level builds on the one before it.
Who counts as an insider
Beginner
The insider rules cover officers, directors and holders of more than 10% of a class of securities.1
Large holder reports
Intermediate
Above 5%, a 13D is the default, though some holders qualify for the shorter 13G depending on the facts.3
Institutional disclosure
Advanced
Managers with $100 million or more in qualifying securities must file Form 13F.4 The reports are periodic and not real-time, and other countries use different thresholds.
Common mistakes
Treating every insider sale as bearish
Many are tax or diversification sales.
Using 13F data as live
Holdings may have changed.
Ignoring 13D vs 13G
Intent differs.
Assuming US thresholds apply everywhere
Rules differ by country.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- Insiders are officers, directors and 10%+ holders.
- Insiders report trades on Forms 3, 4 and 5.
- Over 5% holders file Schedule 13D or 13G.
- Large managers file Form 13F.
- Thresholds differ by country.
Frequently asked questions
Is insider buying a buy signal?
How current is 13F data?
Do other countries have similar rules?
Further learning
- Fundamental Analysis
Ownership as part of research.
- Short Interest
The other side of positioning.
- Market Capitalisation
Sizing stakes.
- Liquidity
Effects of concentrated holders.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- Investor.gov (SEC). Forms 3, 4 and 5 (opens in a new tab) Checked .
- FINRA. Institutional Investors and ‘Smart Money’ (opens in a new tab) Checked .
- Investor.gov (SEC). Schedules 13D and 13G (opens in a new tab) Checked .
- SEC. Frequently Asked Questions About Form 13F (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.