How a spin-off happens: the timeline from announcement to first trade

A spin-off is not a single event. It is a sequence of SEC filings that plays out over months, and each step carries a date that matters if you hold the stock. Here is the whole path, from the parent's first announcement to the day the new company trades on its own. Every step below traces to a document you can open and read yourself.

1. The announcement (Form 8-K)

It starts when the parent's board decides to separate a business and tells the market. That disclosure usually lands as an 8-K under Item 7.01 or 8.01. At this stage there is intent but few hard numbers: often no firm ratio, no record date, and only a rough timeline. Treat the announcement as a heads-up, not a blueprint. The terms can still change.

2. The registration (Form 10, filed as 10-12B)

For the new company to trade publicly, it registers its shares with the SEC on Form 10, filed as a 10-12B. The heart of that filing is the Information Statement, the closest thing a spin-off gets to a prospectus. It lays out the business, its financials, the debt and capital structure it inherits, how the distribution will work, and the risks. If you read one document about a spin-off, read this one. We link the Information Statement on every spin-off's page.

3. SEC review and amendments (10-12B/A)

The SEC reviews the Form 10 and sends back comments. The company responds by filing amendments, marked 10-12B/A. Terms can shift between versions, so the final amendment is the authoritative one. This is also why an early Form 10 may state an expected distribution date that later moves. We read the stated date from the filing and leave it blank rather than guess when the document does not give one.

4. The record date

The record date is the cutoff for eligibility. If you own the parent's shares at the close of business on that date, you are entitled to the distribution. Buy the parent after it, and the new shares go to the previous holder, not to you. Because of standard settlement, the practical buy-by date is usually a day or two before the record date.

5. The distribution date and the ratio

On the distribution date, the parent issues the new shares to qualifying holders according to a ratio. One new share for every three parent shares is a typical example. This is the moment the spin-off becomes real and the new company begins life as a separate public stock. We track the record date, the distribution date, and the ratio for each spin-off in the catalog.

6. When-issued, then regular trading

Around the distribution, the new stock often trades “when-issued” first. That is a conditional market, usually under a temporary ticker, that settles only once the distribution completes. After that it moves to regular-way trading. Early prices can be noisy: index and sector funds that received the spin-off frequently have to sell it regardless of value, which is one reason the research finds spin-offs are often mispriced at birth. See the Spinoff Scorecard for what the academic literature actually shows.

7. The tax piece (Form 8937, IRS Section 355)

Most classic spin-offs are structured to be tax-free to shareholders under Section 355 of the tax code. To make that work at tax time, the company files Form 8937, which tells holders how to split their cost basis between the parent and the new shares. When a spin-off has filed an 8937, we surface it on the company page so you can find the official allocation rather than guess at it.

Every step above is a filing you can open. We track the announcement, the Form 10, the record date, the distribution date, and the ratio for every classic US spin-off in the catalog, back to 1994. For the definitions and how we source each field, see Methodology.