Financial & Cost Signals
Rule of 40
The SaaS health heuristic that revenue growth rate plus profit margin should exceed 40% — a one-number test of whether growth is worth its cost.
Origin: Popularized in venture-capital writing in the mid-2010s, notably Brad Feld's "The Rule of 40% for a Healthy SaaS Company" (2015).
Definition
The Rule of 40 says a healthy software company's revenue growth rate and profit margin (typically free-cash-flow or EBITDA margin) should sum to at least 40. It formalizes the growth-profitability trade: growing 60% while burning a -20% margin passes; growing 20% at break-even does not. The heuristic spread through venture and growth-equity circles in the mid-2010s, popularized in essays by investors including Brad Feld (2015).
Its usefulness is comparative discipline: it puts a fast-growing money-loser and a slow-growing cash generator on one scale, which is how investors — and therefore boards — actually think about software businesses at scale. Its limits are equally known: it fits scaled companies better than early-stage ones, and it is a heuristic, not a law.
For competitive analysis of public rivals, the inputs are in the filings, and a competitor's Rule-of-40 trajectory frames their strategic room: a company sliding below the line faces investor pressure toward margin — predicting price increases, hiring slowdowns, and reduced product investment before they are announced.
Why it matters for competitive intelligence
A public rival's position against the Rule of 40 predicts the pressure they are under — and pressured companies make forced moves you can anticipate rather than react to.
How Rivalize helps
For public competitors, Rivalize pairs filing-derived facts with observed behaviour — pricing moves, hiring pace — so you can see a rival's efficiency pressure translating into market action.
Related terms
ARR & MRR
The normalized run-rate of subscription revenue — the metric SaaS companies are valued on, and the number competitors most want you to overestimate.
Unit Economics
The profit and loss of a single unit of the business — one customer, one order, one seat — which determines whether scale will save a company or bury it.
SEC Filings
Mandatory disclosures public U.S. companies file with the Securities and Exchange Commission — a rich, authoritative source of competitor intelligence.
Burn Rate & Runway
How fast a company consumes cash, and how many months of survival that implies — the clock that quietly drives a private competitor's strategic behaviour.
See it in practice on Rivalize
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Sources
- Brad Feld, "The Rule of 40% for a Healthy SaaS Company" (feld.com, 2015)
This definition is an educational summary of an established concept, written by the Rivalize team. It is not affiliated with, or endorsed by, the originators of the framework.