Where to Find Stock Dilution and Shelf Offering Data

Point-in-time S-1 registration data enriched with market context and lifecycle tracking, available from Alphanume.

Dilution is one of the most mechanically bearish events a stock can face. When new shares hit the market through registration statements and offerings, each existing share represents a smaller claim on the company. The catch is that these events are disclosed in SEC filings that most traders never read, and turning that filing flow into structured, queryable data is a real project.

Alphanume does that work and exposes it as the Stock Dilution dataset.

What the dataset is

The Stock Dilution dataset is a point-in-time record of S-1 registration statements, enriched with market context and lifecycle tracking through effectiveness or withdrawal. Each record is the filing as it was known on its filing date, and it is later resolved as the registration becomes effective or is withdrawn. Nothing is rewritten after the fact, so the history reflects what you would actually have seen at the time.

Key fields

• date, filing_timestamp, ticker, company_name
• market_cap_at_filing, dilutive, resale, shares_offered
• became_effective, effective_date, days_to_effective
• offering_withdrawn, withdrawal_date, days_to_withdrawal
• root_file_number, accession_number, filing_url, last_updated

What you can do with it

• Identify dilution risk at the moment of filing.
• Size exposure around secondary offerings and resale pressure.
• Build short-biased small and mid-cap strategies on a structural catalyst.
• Study post-filing outcomes: how names behaved after effectiveness or withdrawal.

How to access it

Stock Dilution is on the free tier as a rolling 30-day delayed window, and the API key is optional (a limited subset is available without one). Pull recent filings with a date range:

curl "https://api.alphanume.com/v1/dilution?date_gte=2026-05-01&api_key=alp_your_key"

Grab a free Alphanume API key, read the API documentation, or explore it on Alphanume to browse recent filings.

Related

Pair dilution data with Historical Market Cap to gauge dilutive impact relative to size, and with De-SPAC Events for a fuller corporate-action short universe.

Turning filings into a tradable signal

Dilution events are disclosed before they fully hit the price, but they are buried in S-1 registration statements and related filings that most traders never read. The edge is in reading them at scale and on time: extracting the ticker, the share count, the offering context, and the lifecycle status across the whole market, every day.

Alphanume parses and structures that flow, enriching each filing with market context and tracking it through effectiveness or withdrawal. Because each record is preserved as known on its filing date and never rewritten, you can both react to fresh filings and reconstruct exactly what was known on any past date for an honest backtest.

Frequently asked questions

What filings does the dilution dataset cover?

It is a point-in-time record of S-1 registration statements, enriched with market context and tracked through effectiveness or withdrawal.

Why is dilution bearish?

New shares expand the float, so each existing share represents a smaller claim on the company. More supply against the same or declining value tends to pressure the price.

Does the data change after filing?

The original filing record is preserved as known on its filing date, then resolved over time as it becomes effective or is withdrawn. Nothing is rewritten retroactively.

Is an API key required?

No, the key is optional and returns a limited subset without one. A full free key gives a rolling 30-day delayed window, and Pro removes the delay.

How do I gauge dilutive impact?

Compare shares_offered against market_cap_at_filing, and use the dilutive and resale flags to separate true new issuance from resale registrations.