Price-to-Sales After an Acquisition: A Denominator Trap
An acquisition can move price-to-sales before the new revenue is fully reported. Learn to align the valuation date with the revenue period.
Price-to-sales looks simple: equity market value divided by revenue. After an acquisition, timing makes the denominator less simple. The share price can react when a deal closes, while trailing revenue includes only the portion reported during the measured period.
A made-up example
Suppose Buyer Co. has a $10 billion equity value and $2 billion in trailing revenue. Its P/S is 5x. It then buys a business with $1 billion of annual revenue. If the equity value stays at $10 billion, a rough combined annual-revenue calculation is 3.3x. But the next trailing figure will not jump instantly from $2 billion to $3 billion: only post-close revenue enters the buyer's reported periods. Deal financing can change the equity value too.
That does not mean one figure is wrong. The 5x number describes a historical denominator. The 3.3x number is a hypothetical run rate with assumptions that need to be shown.
Read the line item, then the notes
Use SEC EDGAR filing search to find the buyer's latest filing, acquisition date, and revenue disclosure. The SEC's 10-Q form shows the quarterly reporting framework; the 10-K form covers annual reporting. Check for divestitures as well as acquisitions. Both can break a casual comparison with prior years.
On a historical P/S chart, mark the deal close and subsequent report dates. Ask whether a multiple drop came from a price move, a changed denominator, or both. A cleaner comparison may require a clearly labeled pro forma revenue estimate, which is different from reported trailing revenue.
Key takeaway
Keep reported trailing revenue and pro forma revenue in separate columns. A single unlabeled P/S hides the most important assumption.
This is an educational example, not investment advice. The companies and numbers in the example are hypothetical.