Form S-4 business combination registrations
Every Form S-4 since 1994: registration of securities issued in mergers, acquisitions and exchange offers, often a joint proxy statement prospectus.
curl -H "Authorization: Bearer $SECFEED_KEY" \ "https://secfeedapi.com/v1/filings?query=formType:%22S-4%22&size=2"
import os, requests
r = requests.get(
"https://secfeedapi.com/v1/filings",
params={'query': 'formType:"S-4"', 'size': '2'},
headers={"Authorization": f"Bearer {os.environ['SECFEED_KEY']}"},
)
print(r.json())What is S-4?
When an acquirer pays for a deal with its own stock, or offers to exchange its securities for another company's, it registers those securities on Form S-4. Stock mergers usually combine the S-4 with the target's merger proxy into a joint proxy statement and prospectus.
S-4s also cover exchange offers for debt, such as swapping privately placed notes for registered ones, and the de-SPAC mergers of special purpose acquisition companies, which drove a large spike in filings in 2021.
Domestic companies issuing securities in a business combination, merger, consolidation or exchange offer.
Before the securities are issued, typically weeks before the shareholder meeting that approves the deal.
Filings per year
Every S-4 filing on EDGAR, counted from the SecFeed index, amendments included. Updated daily.
What is inside
| Section | Contents |
|---|---|
| Questions and answers | Plain language summary of the deal and the vote. |
| Background and reasons | Negotiation history and why each board approved the deal. |
| Fairness opinions | Financial advisor analyses for each side. |
| Pro forma financials | Combined financial statements as if the deal had happened. |
| Comparison of rights | How shareholder rights change between the two companies. |
| Merger agreement | The full agreement as an annex. |
Get S-4 data with SecFeed
Search the filings with formType:"S-4", read any document as text or PDF, and use these APIs for structured data:
One feed of SEC M&A filings: merger proxies, S-4 and F-4, Rule 425 communications, tender offers, 14D-9 responses and going private.
EDGAR Filing Query APISearch every SEC EDGAR filing since 1993 with Lucene-style queries over ticker, CIK, form type, filing date, company, SIC and 8-K items.
Full-Text Search APISearch every word of every EDGAR filing and exhibit since 2001. Exact phrases, form type, CIK and date filters, results as JSON.
Latest S-4 filings
| Company | Form | Filed | |
|---|---|---|---|
| Plus Automation, Inc. | S-4 | 2026-10-09 | EDGAR ↗ |
| Drilling Tools International Corp | S-4 | 2026-10-09 | EDGAR ↗ |
| Vireo Growth Inc. | S-4 | 2026-10-09 | EDGAR ↗ |
| PBT Land & Minerals, Inc. | S-4/A | 2026-10-09 | EDGAR ↗ |
| Kensington Capital Acquisition Corp. VI | S-4/A | 2026-10-09 | EDGAR ↗ |
| STANDARD BIOTOOLS INC. | S-4/A | 2026-10-09 | EDGAR ↗ |
| Inflection Point Acquisition Corp. VII | S-4 | 2026-10-08 | EDGAR ↗ |
| Boundless Bio, Inc. | S-4 | 2026-10-08 | EDGAR ↗ |
Use cases
- Track stock for stock M&A and de-SPAC transactions
- Pull pro forma financials for combined companies
- Monitor debt exchange offers
Related forms
Every DEFM14A definitive merger proxy and PREM14A preliminary merger proxy since 1994: deal terms, background, fairness opinions and projections.
425M&A communicationsEvery Rule 425 filing since 2000: merger announcements, investor presentations, employee letters and other communications about stock deals.
S-1IPOs & registrationEvery Form S-1 registration statement and amendment since 1994: IPOs, follow on offerings and resale registrations, with offering terms as JSON.
FAQ
When is an S-4 used instead of a merger proxy?
When the acquirer issues its own securities as consideration. The S-4 usually contains the merger proxy as a joint document.
What is an S-4 POS?
A post-effective amendment to an S-4 registration statement.
Every S-4 filing, one API call away
500 free calls a month. JSON, CSV, PDF and a Python SDK.