How Institutional Investors Report Holdings

How Institutional Investors Report Holdings

The US has a layered system of disclosure requirements for institutional investors. Understanding which forms apply to which investors — and what they contain — is essential for interpreting the data on InvestorLens.

The Primary Forms

Form 13F — Institutional Holdings

Who files: Investment managers with >$100M in 13(f) securities

Frequency: Quarterly (within 45 days of quarter end)

What it shows: Long equity positions, shares held, market value

What it misses: Shorts, bonds, cash, private investments, options (usually)

This is the primary data source for InvestorLens.

Form 4 — Insider Transactions

Who files: Officers, directors, and 10%+ shareholders of public companies

Frequency: Within 2 business days of a transaction

What it shows: Specific trades by corporate insiders

Schedule 13D / 13G — Large Shareholder Disclosures

Who files: Anyone acquiring >5% of a public company's shares

Frequency: 13D within 10 days; 13G annually (or within 45 days for passive holders)

What it shows: Ownership stake and intent (activist vs. passive)

Form N-PORT — Mutual Fund Holdings

Who files: Registered investment companies (mutual funds, ETFs)

Frequency: Monthly (filed monthly, publicly released with a 60-day lag)

What it shows: Full portfolio holdings including bonds

Why Different Funds File Different Forms

The Disclosure Gap

The most important thing to understand: no single form gives a complete picture of an institutional investor's portfolio.

A hedge fund with $10B in equity longs, $5B in short positions, $3B in credit, and $2B in cash will only disclose the $10B in long equity through 13F. The rest is invisible to the public.

This is a fundamental limitation of public filing data — and why InvestorLens is an educational tool, not a comprehensive intelligence platform.

Congressional STOCK Act

Members of Congress and their spouses must disclose trades within 45 days under the STOCK Act. InvestorLens tracks these disclosures separately on the Politicians page.