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  1. Home
  2. Glossary
  3. Regulatory

10% Beneficial Owner

M
Marcus Thorne
Last Updated: February 1, 2026
Plain English Definition

A 10% beneficial owner is any person or entity that owns more than 10% of any class of a company's equity securities. They become "insiders" under Section 16 and must file Form 3, Form 4, and Form 5 reports, and are subject to short-swing profit rules.

The Trader's Take

The Signal

Large shareholders crossing 10% signals significant conviction. Subsequent purchases show continued accumulation.

The Noise

Index fund rebalancing can cause 10% threshold crossings without fundamental conviction.

Actionable Insights

  • 1
    Watch for Form 3 filings that signal new 10% owners.
  • 2
    Monitor 13D filings for activist investors crossing 5%.
  • 3
    Track whether 10% owners are increasing or decreasing positions.
  • 4
    Distinguish between institutional holders and activist investors.

Regulatory Context & Context

Section 16(a) of the Securities Exchange Act defines 10% beneficial owners as insiders. They must file initial ownership statements (Form 3) within 10 days of crossing the threshold and report all subsequent changes (Form 4) within 2 business days.

10% Beneficial Owner vs Beneficial Owner

10% Beneficial Owner

A 10% beneficial owner is any person or entity that owns more than 10% of any class of a company's equity securities. They become "insiders" under Section 16 and must file Form 3, Form 4, and Form 5 reports, and are subject to short-swing profit rules.

Beneficial Owner

A beneficial owner is a person who enjoys the benefits of ownership of securities even if the title is in another name. For SEC reporting purposes, this includes direct ownership, indirect ownership through trusts or partnerships, and ownership by family members.

Common Misconceptions

10% owners are subject to Section 16 rules even if they are not officers or directors.

Crossing 10% doesn't require intent to influence—it's automatic based on ownership.

The 10% threshold is calculated per class of equity securities, not total ownership.

Frequently Asked Questions

When does someone become a 10% beneficial owner?

When they acquire more than 10% of any class of a company's registered equity securities. This includes direct ownership and indirect ownership through trusts or family members.

What filings are required for 10% owners?

10% beneficial owners must file Form 3 (initial statement), Form 4 (changes in ownership within 2 days), and Form 5 (annual statement). If acquiring with intent to influence, Schedule 13D is also required at 5%.

Is a 10% owner considered an insider?

Yes, under Section 16 of the Securities Exchange Act, 10% beneficial owners are classified as insiders alongside officers and directors, and are subject to reporting requirements and short-swing profit rules.

On This Page

Trader's TakeRegulatory ContextCommon MisconceptionsF.A.Q.

Related Intelligence

Trading Terms
Beneficial Owner
Regulatory
Section 16
SEC Filings
Schedule 13D
SEC Filings
Schedule 13G
SEC Filings
Form 3

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