How to Read a 424B5: The Small-Cap Offering Decoder

Direct answer: Form 424B5 is a prospectus supplement filed with the SEC that details the precise terms of a securities offering: price per share, share count, warrant presence, and closing conditions. For small-caps, it's the reference document for measuring the real dilution of a capital raise. Reading it lets you know the exact impact on float and capital structure, well before the numbers show up in quarterly reports.

What is Form 424B5?

The 424B5 is a prospectus filed with the United States Securities and Exchange Commission (SEC) under Rule 424(b)(5) of the Securities Act of 1933. It's a prospectus supplement — a document that completes a base prospectus (typically an S-3 or S-1) by specifying the terms of a specific offering.

Here's how it works: a public company first files a base prospectus, what's called a "shelf registration." This framework authorizes it to sell up to a certain amount of securities over a given period, typically three years. Each time it launches a concrete offering under that umbrella, it files a 424B5 indicating the exact number of shares or warrants sold, the offering price per share, the terms of any warrants (exercise price, duration, cash or cashless coverage), the estimated closing date, the intended use of proceeds, and the commissions paid to placement agents.

The 424B5 must be filed before the offering closes. For anyone following small-caps, it's the reference document that reveals the actual dilution of a raise — where a press release often gives only a gross dollar amount, without saying how many shares hit the market or at what price.

Why the 424B5 Matters for Small-Caps

Small-caps — market cap below $2 billion, often well below — frequently raise capital through registered direct offerings or at-the-market (ATM) offerings with institutional investors or specialized funds. Unlike large-caps that raise at prices close to market, small-caps routinely accept dilutive pricing. Sometimes 10 to 30% below the current price, in exchange for certainty of closing. That's the price of liquidity when you have little revenue and you're burning cash.

These offerings often include warrants — subscription rights that grant the holder the right to purchase additional shares at a fixed price, sometimes for five years. A warrant with an exercise price equal to or below the current stock price represents latent dilution: if the stock rallies, holders exercise, and new shares flood the market. On a small-cap that gaps after news, warrants turn into instant dilution.

The 424B5 is the only place where all these terms are described in detail: the actual offering price (the press release says "approximately $5 million," the 424B5 says "1,500,000 shares at $2.35"), the warrant-to-share ratio (for example, one Series A warrant for every two shares purchased), the warrant coverage (how many shares each warrant can purchase), and protection clauses (price reset, ratchet, full ratchet) that can trigger additional dilution if the stock price drops.

Without reading the 424B5, you don't know the impact on the float — the freely tradable shares. FloatVerify indexes these filings and displays the date of the last known offering for each ticker, because that date matters: a 424B5 filed September 10 won't appear in the 10-Q until early November, but the dilution arrives immediately.

Where to Find the Key Information in a 424B5

A typical 424B5 runs 10 to 50 pages. Here's where to look for the essential data.

Cover page: shares offered, price per share, gross total amount, filing date. Often that's all you need to calculate immediate dilution.

Prospectus Supplement Summary: offering overview, use of proceeds, immediate dilution to existing shareholders (when the company bothers to calculate it, which is rare for small-caps).

Table: Public Offering: summary table. Public price, commissions, net price to the company. The difference between the public price and the net price goes to placement agents — often 6 to 8% of the amount raised.

Description of Securities: warrant terms (strike, expiration, cash or cashless exercise), subscription rights. If you see "cashless exercise," it means holders can exercise without bringing cash, by surrendering part of the warrants — which still dilutes, but less than if everything were exercised.

Plan of Distribution: names of placement agents, commissions, "market making" or "lock-up" clauses. Some 424B5s mention a commitment by placement agents not to short the stock for X days — a detail that matters when the float is tight.

Take an example: a 424B5 states "2,000,000 shares of common stock and Series A warrants to purchase up to 2,000,000 shares of common stock." That means immediate dilution of 2M shares, plus potential dilution of another 2M if the warrants are exercised. If the float before the offering was 10M, the float afterward could reach 14M (10 + 2 + 2). That's 40% dilution in the maximum scenario. The kind of calculation a press release will never give you.

How to Read the Dilution Terms

Dilution calculation happens in three steps.

Step one: identify the number of shares offered. Look for "shares of common stock" or "units" in the 424B5 title or the summary table. Each unit may contain 1 share plus X warrants — read the full definition.

Step two: add the shares underlying the warrants. If the offering includes warrants, check their coverage ("each warrant is exercisable for one share," or "0.5 share," etc.) and their exercise price. If the strike is near or below the current price, assume those shares will hit the market. If the strike is 50% above the current price, you have some cushion — but on a volatile small-cap, 50% can arrive in two weeks.

Step three: divide by total shares outstanding. The prospectus usually states the number of shares outstanding "as of [date]" in the Dilution or Capitalization section. Divide new shares (offered + warrants) by (old + new) to get the dilution rate.

A detail that goes unnoticed: some warrants or preferred shares carry "full ratchet" or "weighted average" clauses that automatically adjust the exercise price downward if the company later raises capital at a lower price. These clauses can trigger additional unanticipated dilution beyond what the initial 424B5 showed. It's written in fine print in the Description of Securities section — but it's this kind of clause that can blow up the float six months later.

FloatVerify displays float sourced from 10-Qs/10-Ks, but flags in amber (source split) when the date of the last 424B5 is later than the last quarterly report. That signals a recent offering not yet reflected in the official numbers, and the real float is likely higher. A 10-Q dated August 15 showing 10M shares + a 424B5 from September 10 adding 2M = real float around 12M, but both sources remain visible with their dates. No arbitrary correction, just the facts.

Common Pitfalls to Avoid

First pitfall: confusing the amount raised with the share count. A press release says "raised $5 million," but doesn't say at what price. If the stock is trading at $3, you might think roughly 1.67M shares. If the 424B5 reveals a price of $2, that's 2.5M shares — 50% more dilution than you imagined.

Second pitfall: ignoring the warrants. A title "Offering of 1,000,000 Shares" can hide 1M additional warrants in the terms. Always read the full description, not just the title.

Third pitfall: not checking the filing date. A 424B5 filed on a Friday evening after the close often signals the offering has already closed or will close within hours. The terms are final. A "preliminary" 424B5 (rare for this form type) can still change, but in 99% of cases, what you read is what happens.

Fourth pitfall: forgetting the commissions. The "Public Offering" table shows the price paid by the investor and the net price received by the company after commissions (often 6-8%). The number of shares issued is based on the public price, but the company only receives the net amount. On a $5M offering, if commissions are 7%, the company receives $4.65M. That matters when estimating cash runway.

Fifth pitfall: not cross-checking with the next 10-Q. The 424B5 gives the offering terms; the next quarterly 10-Q updates the official share count and float. FloatVerify automatically cross-checks these sources and displays the date of each figure. A float "12.5M as of 2026-08-15 (10-Q)" + "2M offering on 2026-09-10 (424B5)" = amber source split, with both dates visible. The user sees that the 10-Q predates the offering and can estimate the current float at roughly 14.5M.

FloatVerify and the 424B5

FloatVerify indexes SEC filings in near real time, including 424B5s. When a new 424B5 is filed, the system automatically extracts the number of shares offered, the price, and the presence of warrants (when this data is in a structured format), displays the date of the last known 424B5 in the "Last offering" line for each ticker, and flags in amber (source split) if that date is later than the last quarterly report.

This approach respects the FloatVerify invariant: display what is sourced and dated, and show divergences instead of arbitrarily choosing one source. A float "12.5M as of 2026-08-15 (10-Q)" + "2M offering on 2026-09-10 (424B5)" = amber source split, with both dates visible. The user sees that the 10-Q predates the offering and can estimate the current float. FloatVerify never "corrects" an official figure with an estimate. It shows both sources and their dates, and lets the user judge. That's what separates a data tool from an aggregator that hides its assumptions.

Recap

Point	Takeaway
Definition	The 424B5 is a prospectus supplement that details the exact terms of a securities offering under a base prospectus (S-3 or S-1).
Where to find it	SEC EDGAR (sec.gov/edgar), filter by form type 424B5, sorted by filing date.
Key info	Share count, price, warrants (strike, duration, coverage), commissions, use of proceeds.
Dilution	(Shares offered + warrant shares) / (outstanding before + new shares).
Pitfalls	Confusing amount raised with share count, ignoring warrants, not checking reset clauses.
FloatVerify	Indexes 424B5s, displays last offering date, flags in amber when it postdates the latest 10-Q.

FAQ

What is Form 424B5?

It's a prospectus supplement filed with the SEC that specifies the final terms of a securities offering (price, quantity, warrants). It completes a base prospectus (S-3 or S-1) and must be filed before the offering closes. For small-caps, it reveals the exact dilution conditions.

Where can I find a company's 424B5 filings?

On SEC EDGAR (sec.gov/edgar), search the ticker or company name, then filter by form type '424B5'. Every filing is dated and timestamped. FloatVerify automatically indexes these filings and displays the date of the last known offering.

What's the difference between a 424B5 and an S-3?

The S-3 is a base prospectus (shelf registration) that authorizes the company to raise capital over three years. The 424B5 is the document that details each individual offering under that S-3: how many shares, at what price, with which warrants. The S-3 is the framework; the 424B5 is the execution.

How do I calculate dilution from a 424B5?

Find the number of shares offered (page 1 or in the 'Public Offering' table), add the underlying shares from any warrants, then divide by total shares outstanding before the offering (stated in the prospectus or the latest 10-Q). Dilution = new shares / (old + new).

Why is the 424B5 critical for small-caps?

Small-caps often raise capital through registered direct offerings at dilutive prices, sometimes with warrants that amplify future dilution. The 424B5 is the only document that provides the exact, dated, and final terms of each offering. Without reading it, you don't know the real impact on the float.

Sources

• SEC EDGAR — search filings by ticker or form type
• Securities Act of 1933, Rule 424(b)(5) — filing requirements for prospectus supplements
• SEC Form Types — official list of forms and their uses
• Regulation S-K, Item 508 — disclosure requirements for prospectuses
• Forms S-3, S-1, 10-Q, 10-K — documents cross-referenced with the 424B5 to reconstruct the dilution timeline

See the float, sourced and dated, on FloatVerify.

---

FloatVerify shows the float, dilution and cash burn of US small-caps, every number sourced and dated — and surfaces divergences between sources ("source split") instead of one falsely certain figure.

Disclaimer: FloatVerify is a data tool, not an investment advisory service. Nothing here is a recommendation to buy or sell. Data, not advice.