SEC Form 424B4 API

Form 424B4 API (Final Prospectus)

Q: How do I list recent 424B4 filings?

Call `/v1/filings?formTypes=424B4&startDate=YYYY-MM-DD` to page final prospectuses by date.

Get the final word on every offering. The Form 424B4 API delivers the priced prospectus filed after an IPO or follow-on prices — as structured JSON.

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JSON responsesOpenAPI documentedcURL / Python / JS / GoFree tier available

What is Form 424B4?

Form 424B4 is the final prospectus filed under Rule 424(b)(4) after a registered offering is priced. It reflects the actual offering price, share count, and final terms.

Where the S-1 is the draft, the 424B4 is the closed deal: it confirms what was sold and at what price.

The Finsider Form 424B4 API indexes these filings so you can confirm pricing, measure issuance, and complete your IPO and follow-on dataset.

Fetch Form 424B4 filings

List recent Form 424B4 filings, filterable by company, ticker, and date.

cURLPythonJavaScriptGo

curl -s "https://api.secapi.dev/v1/filings?formTypes=424B4&limit=20" \
  -H "x-api-key: $SECAPI_KEY"

import requests

resp = requests.get(
    "https://api.secapi.dev/v1/filings?formTypes=424B4&limit=20",
    headers={"x-api-key": "YOUR_API_KEY"},
    timeout=30,
)
resp.raise_for_status()
data = resp.json()
print(data)

const res = await fetch("https://api.secapi.dev/v1/filings?formTypes=424B4&limit=20", {
  method: "GET",
  headers: { "x-api-key": process.env.SECAPI_KEY },
});
if (!res.ok) throw new Error(`HTTP ${res.status}`);
const data = await res.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
)

func main() {
	req, _ := http.NewRequest("GET", "https://api.secapi.dev/v1/filings?formTypes=424B4&limit=20", nil)
	req.Header.Set("x-api-key", os.Getenv("SECAPI_KEY"))

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

Who files Form 424B4?

Filer	Requirement
Issuers pricing an offering	After the SEC declares the S-1 effective
IPOs	Final prospectus with the IPO price
Follow-on offerings	Secondary and shelf takedowns
Underwriters	Distribute the final prospectus to buyers

Deadlines & coverage

Aspect	Detail
Trigger	Filed after pricing, typically within 2 business days
Relationship	Follows the related S-1 / S-3 registration
Contents	Final price, share count, and proceeds
Availability	Indexed within minutes of acceptance

Key data fields

A sample of the structured fields returned for Form 424B4 data.

Field	Description
`companyName` / `cik`	Issuer identity
`formType`	`424B4`
`filingDate`	Date the final prospectus was filed
`documents`	Final prospectus document and exhibits
`accessionNumber`	Unique SEC identifier

Related API endpoints

Deep-link into the interactive reference to try these live.

GET /v1/filings List filings Search and page every SEC filing, filtered by form type, company, ticker, and date. GET /v1/filings/{cik}/{accessionNumber}/documents List filing documents and exhibits Enumerate every document and exhibit attached to a filing, with direct URLs. GET /v1/entities/{identifier}/filings List a company’s filings Return every filing for a company by ticker or CIK. GET /v1/filings/{accessionNumber} Get filing by accession number Retrieve a single filing and its metadata by SEC accession number.

Frequently asked questions

What is the Form 424B4 API?

An endpoint that returns SEC Form 424B4 final prospectuses — the priced offering documents filed after an IPO or follow-on — as structured JSON.

What is the difference between S-1 and 424B4?

The S-1 is the registration statement filed before an offering; the 424B4 is the final prospectus filed after the deal prices, reflecting the actual price and terms.

How do I list recent 424B4 filings?

Call /v1/filings?formTypes=424B4&startDate=YYYY-MM-DD to page final prospectuses by date.

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