FreeInsiderTrades / Guides
How people actually use insider trading data, and how to read the Form 4 filings behind it. These guides explain the codes, the timing, the selling patterns and the limits of the data, in plain language. Nothing here is investment advice; the filings are a research input, not a recommendation.
What Is a Form 4?
Form 4 explained: the Section 16 filing that reports insider trades by officers, directors, and 10 percent owners within two business days.
Who Has to File a Form 4
Officers, directors, and ten percent owners file Form 4 under Section 16, and this article explains who is covered and who is exempt.
Insider Trading Glossary
Plain definitions of the insider trading terms used on this site, from Form 4 and Section 16 to cluster buys, 10b5-1 plans, and transaction codes.
Insider Trading: Legal vs Illegal
Why the trades tracked here are legal and disclosed, and what actually turns trading on inside information into a crime.
How Traders Use Insider Buying Data
How traders screen Form 4 filings for open market purchases, build watchlists, and fit insider buying into a wider research workflow.
How to Read a Form 4 Like a Trader
A practical walk through a Form 4: transaction codes, dates, direct and indirect ownership, price, size, and Tables I and II.
Form 4 Transaction Codes Explained
What Form 4 codes P, S, A, M, F, G, C, and J mean, why they matter, and why open market purchases and sales get the most attention.
The 2 Business Day Rule for Form 4
When insiders must file Form 4 within two business days, how the clock works, and what filing lag means for readers following the data.
Reading Form 4 Footnotes: Where the Story Often Sits
How Form 4 footnotes explain 10b5-1 plans, vesting, weighted average prices, and indirect holdings, and why skipping them leads to errors.
Direct vs Indirect Ownership on a Form 4
How Form 4 separates shares held personally from shares held through trusts, spouses, and funds, and why it matters when judging a buy.
Derivative vs Non-Derivative Securities on Form 4
The difference between Table I stock and Table II derivatives like options and convertibles, and why an option grant is not a purchase.
Amended Form 4 Filings: What Form 4/A Means
Why insiders file Form 4/A amendments, what typically changes in a correction, and how readers should treat an amended filing.
Late Form 4 Filings and What They Tell You
What it means when a Form 4 arrives after the two business day deadline, how late filings are disclosed, and why some trades surface weeks late.
Checking the Original Filing on EDGAR
Learn how to open the original Form 4 on EDGAR and verify shares, price, footnotes, and ownership to catch aggregator errors yourself.
Cluster Buys Explained: Why Group Insider Buying Matters
What a cluster buy is, why three or more insiders buying the same stock within 30 days stands out, and how to read the pattern carefully.
Whose Insider Trades Matter Most
Why CEO and CFO open market purchases tend to carry more weight than director or 10 percent owner trades, and how to judge each role.
Open-Market Buys vs Option Exercises: Why Code P Means More
A code P purchase spends cash at the market price, while a code M exercise usually converts compensation, and the difference matters for readers.
How Big Is a Meaningful Insider Buy?
A meaningful buy is judged against salary, existing holdings, and the size of the company, not against the headline dollar amount alone.
Insider Buying in Small Caps vs Large Caps
The same dollar purchase carries different information at a small company than at a large one because pay, liquidity, and coverage differ.
Insider Buying After a Price Drop
Insiders buying after a decline can show conviction, but readers need to check the size, the pattern, and whether the business itself has changed.
Insider Data as a Screen, Not a Signal
Insider filings work best as a way to build a research list and prioritize reading, rather than as a stand-alone reason to buy a stock.
Combining Insider Buys With Price Momentum
An insider buy means something different when it confirms an existing uptrend than when it appears in a stock still in a downtrend.
Combining Insider Buys With Earnings and Revenue Growth
Checking revenue, earnings, and cash flow behind an insider buy separates conviction about a healthy business from hope about a broken one.
Insider Activity Around Earnings
Why insider trading goes quiet before earnings, why Form 4 filings bunch after results, and how to read buying that follows a report.
Insider Blackout Windows Explained
Companies close insider trading windows around earnings and major news, which is why filings go quiet and then bunch up after results.
Insider Buying in Biotech Stocks
Biotech insider buys sit next to trial results, financings, and cash runway questions, so context matters even more than usual in this sector.
Insider Activity in Bank Stocks
Why bank insiders file so often, what buying after stress can mean, and how deposit and rate worries shape their trades.
Insider Activity in Energy Stocks
How commodity cycles affect energy insider trades, why insiders sometimes buy when oil falls, and what clouds the signal.
Insider Activity in REITs and Real Estate Stocks
Why REIT insider buying is rarer and slower, how distributions shape holdings, and what property cycles do to insider trades.
Insider Buying During Market Selloffs
During broad selloffs, waves of insider buying can appear across many companies, and breadth matters more than any single buy.
Insider Activity and Short Interest
Insider buys and high short interest point in opposite directions, and this article explains what each dataset measures and squeeze risk.
Insider Data for Value Investors
Value investors and buying insiders share a focus on price versus worth, and this article shows where insider data fits a margin of safety approach.
Insider Buying in Turnaround Stocks
A new chief executive buying stock in a struggling company draws attention, and this article helps separate a credible rescue from a value trap.
Insider Buys vs Company Buybacks
Insider buys and company buybacks both involve buying stock but signal different things, and this article explains each and when they align.
Tracking Insider Signals Without Trading Them
Watchlists, journals, and paper tracking let you learn what insider data is worth before risking money on any signal.
How Quant Funds Use Insider Data
How systematic funds parse EDGAR filings at scale, what factor studies find, and why buys and clusters get more weight than sells.
How Journalists and Researchers Use Form 4 Data
How reporters find stories in insider filings, what selling patterns reveal about pay, and why they check the original document.
Insider Ownership Levels and Alignment
Why ownership is judged in percent rather than dollars, how high and low ownership both arise, and what skin in the game really shows.
Why Insider Selling Is Usually Not a Bearish Signal
Insider selling happens for many routine reasons, which is why a single sale rarely carries the same weight as an open-market buy.
When Insider Selling Deserves a Second Look
Most insider sales are routine, but clusters, large proportional sales, and sales into weakness are patterns worth investigating further.
Rule 10b5-1 Plans Explained
Rule 10b5-1 plans let insiders schedule trades in advance, and the footnotes, cooling-off periods, and disclosures tell readers how to interpret them.
Insider Selling and Lockup Expiry
What IPO lockups are, why filings surge when they lift, and why that wave of selling is usually mechanical rather than informed.
Tax-Driven Insider Selling
How sales to cover tax on vested stock work, why they cluster at vesting and year end, and how code F differs from a market sale.
Retirement and Diversification Sales
How to spot a planned exit, why retiring executives sell down over time, and why concentration risk drives most very large sales.
Selling by 10 Percent Owners
Why sales by large owners often reflect fund mechanics rather than a view on the business, and how they differ from officer sales.
Section 16 Short-Swing Rules in Plain English
Section 16 forces insiders to return profits from buying and selling within six months, which shapes how and when insiders trade.
Common Mistakes Reading Insider Data
A guide to beginner errors in insider data, including grants mistaken for buys, filing lag, single sales, and skipped footnotes.
Why Insiders Are Often Early
Insider buys often come months before a stock moves because insiders buy value with long horizons, so early can look wrong at first.
The Limits and Risks of Insider Data
Form 4 data is useful but narrow, covering what it cannot tell you, why stories mislead, and the risk of following any single filing.
Insider Trading Myths
Five popular beliefs about insider data are not supported by the filings, and this article separates what Form 4 shows from what people imagine.