Insights
Research and field notes
Long-form writing on market data infrastructure, systematic strategies, and the corporate-action signals that drive event-driven trading.
- June 1, 2026
What Is an S-3 Shelf Registration?
By Alphanume Team
- May 31, 2026
What Is a 424B5 Filing? (Equity Offering Guide)
By Alphanume Team
- May 30, 2026
What Is an At-the-Market (ATM) Offering?
By Alphanume Team
- May 29, 2026
What Is a Registered Direct Offering?
By Alphanume Team
- May 28, 2026
What Is a PIPE Deal?
By Alphanume Team
- May 27, 2026
What Is a Bought Deal in Equity Offerings?
By Alphanume Team
- May 26, 2026
How to Find Equity Offering Announcements in SEC Filings
By Alphanume Team
- May 25, 2026
How to Detect Toxic and Death-Spiral Financing
By Alphanume Team
- May 24, 2026
What Is an Equity Line of Credit (ELOC)?
By Alphanume Team
- May 23, 2026
How to Track Shelf Registration Takedowns
By Alphanume Team
- May 22, 2026
How to Find Dilution Events Programmatically
By Alphanume Team
- May 21, 2026
Do Stock Offerings Make the Price Go Down?
By Alphanume Team
- May 20, 2026
What Is Post-Offering Drift?
By Alphanume Team
- May 19, 2026
How to Build a Stock Dilution Screener
By Alphanume Team
- May 18, 2026
What Is Warrant Overhang and Why It Matters
By Alphanume Team
- May 17, 2026
What Is a De-SPAC and Why Do They Underperform?
By Alphanume Team
- May 16, 2026
What Is a SPAC Lock-Up Expiration?
By Alphanume Team
- May 15, 2026
How to Find De-SPAC Closing Dates
By Alphanume Team
- May 14, 2026
What Is a PIPE in a SPAC Deal?
By Alphanume Team
- May 13, 2026
How to Build a Lock-Up Expiration Calendar
By Alphanume Team
- May 12, 2026
What Is Float Rotation After a De-SPAC?
By Alphanume Team
- May 11, 2026
How to Track Lock-Up Expirations From S-1 Filings
By Alphanume Team
- May 10, 2026
What Is a Hard-to-Borrow Stock?
By Alphanume Team
- May 9, 2026
How Are Stock Borrow Fees Calculated?
By Alphanume Team
- May 8, 2026
What Is a Short Squeeze and How Do You Spot One?
By Alphanume Team
- May 7, 2026
What Is Buy-In Risk for Short Sellers?
By Alphanume Team
- May 6, 2026
General Collateral vs Hard-to-Borrow Explained
By Alphanume Team
- May 5, 2026
How Do Short Proceeds and Margin Work?
By Alphanume Team
- May 4, 2026
Who Pays the Dividend on a Shorted Stock?
By Alphanume Team
- May 3, 2026
What Is Days-to-Cover (Short Interest Ratio)?
By Alphanume Team
- May 2, 2026
How to Find Short Squeeze Candidates With Data
By Alphanume Team
- May 1, 2026
What Is a Locate in Short Selling?
By Alphanume Team
- April 30, 2026
What Is Survivorship Bias in Backtesting?
By Alphanume Team
- April 29, 2026
What Is Look-Ahead Bias and How to Avoid It
By Alphanume Team
- April 28, 2026
What Is Point-in-Time Data?
By Alphanume Team
- April 27, 2026
How to Compute Abnormal Returns
By Alphanume Team
- April 26, 2026
What Is Cumulative Abnormal Return (CAR)?
By Alphanume Team
- April 25, 2026
How to Design an Event Study
By Alphanume Team
- April 24, 2026
What Is Delisting Bias?
By Alphanume Team
- April 23, 2026
How to Backtest a Short-Selling Strategy
By Alphanume Team
- April 22, 2026
How to Avoid Look-Ahead Bias in Universe Construction
By Alphanume Team
- April 21, 2026
What Is Borrow-Cost-Adjusted Return?
By Alphanume Team
- April 20, 2026
How to Handle Corporate Actions in Backtests
By Alphanume Team
- April 19, 2026
What Is Point-in-Time Market Cap and Why It Matters
By Alphanume Team
- April 19, 2026Featured
Alphanume Partner Program
By Alphanume Team
- April 18, 2026
How to Get a List of Stocks With Weekly Options
By Alphanume Team
- April 17, 2026
What Are 0-DTE Options and Which Indices Have Them?
By Alphanume Team
- April 16, 2026
How to Find Optionable Stocks via API
By Alphanume Team
- April 15, 2026
How the Weekly Options Universe Expanded Over Time
By Alphanume Team
- April 14, 2026
What Is Expiration Density in Options?
By Alphanume Team
- April 13, 2026
How to Filter a Tradeable Options Universe Point-in-Time
By Alphanume Team
- April 12, 2026
How to Get Historical Market Cap Data
By Alphanume Team
- April 11, 2026
What Is a Market Regime Filter?
By Alphanume Team
- April 10, 2026
How to Classify Risk-On vs Risk-Off Days
By Alphanume Team
- April 9, 2026
How to Find the Biggest Stock Movers Each Day
By Alphanume Team
- April 8, 2026
How to Get Historical S&P 500 Constituents
By Alphanume Team
- April 7, 2026
Why Events Move Markets
By Alphanume Team
- April 6, 2026
The Case for the Short Side: Who Is Forced to Sell
By Alphanume Team
- April 6, 2026
Best Brokers for Short Selling Strategies in 2026
By Alphanume Team
- April 6, 2026
How to Find Stocks to Short Sell Using Data
By Alphanume Team
- April 6, 2026
Short Selling De-SPACs: The Complete Data-Driven Approach
By Alphanume Team
- April 5, 2026
Structural Underperformers: A Short-Seller's Taxonomy
By Alphanume Team
- April 4, 2026
Scheduled vs Unscheduled Events: Why Disclosure Matters
By Alphanume Team
- April 3, 2026
The Five-Beat Framework for Event-Driven Shorts
By Alphanume Team
- April 2, 2026
Equity Offerings as a Systematic Short Signal
By Alphanume Team
- April 1, 2026
The Signaling Theory of Equity Issuance (Myers-Majluf)
By Alphanume Team
- March 31, 2026
Repeat Issuers: The Strongest Dilution Filter
By Alphanume Team
- March 30, 2026
Green Shoe and Over-Allotment Mechanics
By Alphanume Team
- March 29, 2026
Failure Modes of the Dilution Short
By Alphanume Team
- March 28, 2026
ATM Programs Explained for Short Sellers
By Alphanume Team
- March 27, 2026
How to Read ATM Usage Disclosures
By Alphanume Team
- March 26, 2026
Why ATMs Differ From Discrete Offerings
By Alphanume Team
- March 25, 2026
ATM Program Evidence: What the Data Shows
By Alphanume Team
- March 24, 2026
ATM Short Failure Modes
By Alphanume Team
- March 23, 2026
De-SPAC Float Dynamics, Explained
By Alphanume Team
- March 22, 2026
Why De-SPACs Underperform: The Evidence
By Alphanume Team
- March 21, 2026
The De-SPAC Systematic Short Framework
By Alphanume Team
- March 20, 2026
De-SPAC Redemptions and Free Float
By Alphanume Team
- March 19, 2026
De-SPAC Short Failure Modes (and Squeezes)
By Alphanume Team
- March 18, 2026
Lock-Up Expirations as a Supply Event
By Alphanume Team
- March 17, 2026
Quantifying Lock-Up Overhang
By Alphanume Team
- March 16, 2026
Lock-Up Expiration Evidence
By Alphanume Team
- March 16, 2026
Best Polygon.io (Massive) Alternatives for Quantitative Trading Research
By Alphanume Team
- March 16, 2026
Databento Alternatives: Market Data APIs for Quant Researchers
By Alphanume Team
- March 16, 2026
Best Market Data APIs for Algorithmic Trading in 2026
By Alphanume Team
- March 16, 2026
Best Options Data Providers for Systematic Trading Research
By Alphanume Team
- March 16, 2026
Alpha Vantage Alternatives for Serious Quantitative Research
By Alphanume Team
- March 16, 2026
Bloomberg Terminal Alternatives for Independent Quant Traders
By Alphanume Team
- March 16, 2026
ORATS Alternatives: Options Analytics and Volatility Data Providers
By Alphanume Team
- March 16, 2026
FinancialModelingPrep Alternatives for Quantitative Finance Research
By Alphanume Team
- March 16, 2026
Best Free Stock Market APIs: What You Actually Get (and What You Don't)
By Alphanume Team
- March 16, 2026
Best Market Data Sources for Systematic Short Selling Research
By Alphanume Team
- March 16, 2026
Point-in-Time Market Data: Why It Matters and Where to Get It
By Alphanume Team
- March 16, 2026
Best Volatility Data Providers for Options and Derivatives Research
By Alphanume Team
- March 16, 2026
Nasdaq Data Link (Quandl) Alternatives for Quantitative Research
By Alphanume Team
- March 16, 2026
FactSet Alternatives for Independent Traders and Small Quant Teams
By Alphanume Team
- March 15, 2026
The Lock-Up Expiration Framework
By Alphanume Team
- March 14, 2026
Lock-Up Short Failure Modes
By Alphanume Team
- March 13, 2026
Convertible Financing and Death Spirals, Explained
By Alphanume Team
- March 12, 2026
Toxic Financing: Structural Red Flags
By Alphanume Team
- March 11, 2026
Floor Prices, Warrants, and Conversion Mechanics
By Alphanume Team
- March 10, 2026
Convertible / Toxic Financing Evidence
By Alphanume Team
- March 9, 2026
Convertible Short Failure Modes
By Alphanume Team
- March 8, 2026
Combining Event Signals Into One Book
By Alphanume Team
- March 7, 2026
Handling Overlapping Signals on One Name
By Alphanume Team
- March 6, 2026
Position Sizing and Concentration Limits for Shorts
By Alphanume Team
- March 5, 2026
Rebalancing Cadence for an Event-Driven Short Book
By Alphanume Team
- March 4, 2026
Managing the Negative-Skew P&L Path
By Alphanume Team
- March 3, 2026
When to Size Down or Stand Aside (Squeezes)
By Alphanume Team
- March 2, 2026
Tracking Sleeve Ownership Across Event Types
By Alphanume Team
- March 1, 2026
Capital Allocation Across Event Types
By Alphanume Team
- February 28, 2026
Correlation Between Short Sleeves
By Alphanume Team
- February 27, 2026
Aggregate Borrow-Cost Budgeting
By Alphanume Team
- February 26, 2026
Abnormal Return: Definition and How to Compute
By Alphanume Team
- February 25, 2026
Beneficial Ownership and the 10% Threshold (Form 4)
By Alphanume Team
- February 24, 2026
CAR (Cumulative Abnormal Return): Definition
By Alphanume Team
- February 23, 2026
ELOC (Equity Line of Credit): Definition
By Alphanume Team
- February 22, 2026
A Study Guide to Systematic Event-Driven Trading
By Alphanume Team
- February 11, 2026
Which Stocks Have Options? (Complete Guide + Data Source)
By Alphanume Team
- February 11, 2026
Avoiding Survivorship Bias in Options Backtests
By Alphanume Team
- January 7, 2026
Polygon.io (Massive) vs Databento: What’s the Difference?
By Alphanume Team
- January 7, 2026
Where to Find Historical Market Cap Data (And Why It’s Hard)
By Alphanume Team