The NexusForm4 Journal
Insider signals, systematic strategy, and the mechanics of Form 4 data.
Long-form technical writing on how quant teams turn SEC insider filings into repeatable alpha — signal design, execution, backtesting, and the API mechanics behind it.
- Fundamentals··7 min read
10-K vs Form 4: How Corporate Insider Disclosures Compare
Annual reports tell you what the company said. Form 4 tells you what its insiders did. Here is how to read them together for a fuller picture.
10-KForm 4Disclosure - Strategy··8 min read
Integrating Insider Signals into a Systematic Trading Pipeline
Where insider signals fit inside a multi-factor systematic pipeline: as a standalone alpha, a filter, or a confirmation layer. Concrete integration patterns.
SystematicMulti-FactorPipeline - Fundamentals··7 min read
Form 4 Transaction Codes Explained: P, S, A, M, and What They Mean
A field guide to every Form 4 transaction code with signal-value ratings. Know which codes to trade on, which to filter, and which to ignore entirely.
Transaction CodesForm 4Data Cleaning - Data Infrastructure··6 min read
SEC EDGAR vs. NexusForm4 API: Why Structured Data Wins
EDGAR is free. So why do quant teams pay for a Form 4 API? A concrete comparison of engineering cost, latency, and data quality.
EDGARData EngineeringAPI - Tutorials··11 min read
Backtesting Insider Buy Signals in Python: A Step-by-Step Tutorial
A reproducible backtest of an insider cluster-buy strategy using pandas, vectorbt, and the NexusForm4 API. Includes look-ahead controls and turnover metrics.
BacktestPythonPandas - Fundamentals··6 min read
Why C-Suite Buying Matters More Than Insider Selling
Insider buys and sells are not symmetric signals. Here's the asymmetric information reason C-suite purchases outperform, and how to isolate them from noise.
C-SuiteInsider BuysAsymmetry - Signals··7 min read
Understanding the Conviction Score: How We Rank Insider Signals
The NexusForm4 conviction score compresses insider role, trade size, insider trading history, and cluster density into a single 0-100 number. Here's how it works.
Conviction ScoreRankingSignal Design - Strategy··10 min read
Building an Insider Trading Alpha Strategy with the NexusForm4 API
An end-to-end blueprint for turning normalized Form 4 data into a live insider-buying strategy: signal, universe, sizing, execution, and risk controls.
AlphaSystematicPortfolio Construction - Signals··9 min read
How to Detect Insider Cluster Buys: A Signal-Building Framework
Cluster buys — multiple distinct insiders purchasing the same stock within a rolling window — are one of the strongest documented insider signals. Here's how to define, detect, and rank them.
Cluster BuysSignal DesignAlpha - Fundamentals··8 min read
What Is SEC Form 4? A Complete Guide for Quant Traders
SEC Form 4 discloses corporate insider trades within two business days. Here is exactly what it contains, why it moves markets, and how to consume it programmatically.
Form 4SEC EDGARInsider Trading