S-1 vs S-4: two SEC registration forms compared
On S-1 vs S-4, both are SEC registration statements under the Securities Act of 1933, but they register shares sold in very different ways. An S-1 registers securities sold for cash, most often in an IPO. An S-4 registers securities a company issues as payment in a business combination, such as a merger or an exchange offer. This guide compares S-1 vs S-4 so you know which form fits which deal. It is not investment advice.
Definition
An S-1 versus an S-4
are both Securities Act registration statements. The S-1 registers shares sold for cash, usually an IPO. The S-4 registers shares issued as consideration in a merger, stock acquisition, or exchange offer, and it doubles as the proxy statement for the shareholder vote. Source: SEC.
What is the S-1?
An S-1 is the registration statement a company files before selling shares to the public for cash, usually its IPO. It discloses the business, risk factors, use of proceeds, and audited financials, and the SEC must declare it effective before shares are sold. The buyers are cash investors, and there is no deal to vote on.
What is the S-4?
A Form S-4 is the registration statement for securities issued in a business combination. When a company pays for a merger or acquisition with its own stock, those new shares must be registered, and the S-4 does it. Because the deal usually needs a shareholder vote, the S-4 combines the prospectus with a proxy statement into one joint document.
How do the two registration forms compare?
The split is what the shares are given for, and who receives them.
| What to check | S-1 | S-4 |
|---|---|---|
| What it registers | Shares sold for cash | Shares issued in a combination |
| Typical use | IPO, first-time registration | Merger, stock acquisition, exchange offer |
| Who receives the shares | Cash investors | Target company's shareholders |
| Doubles as a proxy? | No | Yes, when a vote is needed |
| Filed on | EDGAR | EDGAR |
| Approval? | Disclosure, not approval | Disclosure, not approval |
Securities Act of 1933
The statute both the S-1 and the S-4 register securities under, so newly issued public shares are disclosed first
Source: SEC
Reading registration filings
The S-1 and the S-4 both put new shares in front of the public, one for cash and one for a deal. Knowing which a company filed tells you whether it is raising money or combining with another company. For the short-form seasoned-issuer cousin of the S-1, see S-1 vs S-3, and to pull any of these from the regulator's own system, see how to search SEC EDGAR.
Flock reads disclosure filings and keeps each one dated and linked to its SEC source. What any of the data means for you is your call to make.
Frequently asked questions
What is the difference between an S-1 and an S-4?
An S-1 registers securities sold for cash, most often in an IPO, so the buyers are cash investors. An S-4 registers securities issued as consideration in a business combination such as a merger or exchange offer, so the buyers are the target company's shareholders. Both are Securities Act registration statements filed on EDGAR. Source: SEC.
Why does the S-4 include a proxy statement?
A stock merger usually needs a shareholder vote, so the S-4 combines the prospectus for the new shares with the proxy statement that solicits the vote into one joint document. The S-1 does not, because an IPO buyer is not voting on a deal. Source: SEC.
Which form is used for an IPO versus a merger?
An IPO uses Form S-1. A merger or exchange offer paid in stock uses Form S-4. A company can file an S-1 early in its life and an S-4 later if it acquires another company using its shares. Source: SEC.
Are both S-1 and S-4 filed on EDGAR?
Yes. Both the S-1 and the S-4, along with their amendments filed as S-1/A and S-4/A, are filed on the SEC's EDGAR system and are free to read. Source: SEC EDGAR.
Flock tracks these filings, sourced, dated, and linked back to the original. See what smart-money entities disclosed, without the guesswork about what it means.
Disclosures shown are public regulatory filings. Data may be delayed or incomplete. Smart-money entities may no longer hold positions shown. Not investment advice.