The Rule of 40—the longstanding software valuation metric that said growth rate plus profit margin should exceed 40%—just got its eulogy. Kroll's Summer 2026 software M&A report shows that while deal count is near record highs, the traditional formula no longer explains what buyers will pay. Growth trumps margins, and category positioning now matters more than both combined.
For founders building toward an exit or fundraise, this shift changes everything. You need a product customers will pay for, and you need revenue traction fast. The market no longer rewards operational excellence in isolation—it rewards the right story in the right category with demonstrable growth.
The Death of Margin Premium
Kroll's data reveals a stunning finding: margins above 25% contribute almost nothing to valuation multiples. Two subsectors with identical 46% Rule of 40 scores now trade at vastly different multiples. Engineering software commands a 73% premium over human capital management (HCM) despite identical growth-plus-margin profiles.
The aggregate deal value tells another story. Once you exclude the $60 billion SpaceX acquisition of Cursor, total deal value sits near a decade low. Acquirers are selective, and they're paying for narratives they believe will survive AI disruption, not just clean financial statements.
Marketing and customer experience software—the categories most vulnerable to AI automation—trade at the lowest multiples. Engineering tools and cybersecurity command the highest. The market is pricing future durability and AI leverage, not current performance metrics.
Growth Is the Only Margin That Matters
If the Rule of 40 is half dead, growth is the half that's still breathing. Investors and acquirers want to see revenue traction above everything else. A high-growth company in a defensive category will command multiples that a profitable, slow-growth company in a vulnerable category cannot match.
This creates urgent pressure for founders: you need a working, sellable product in market as quickly as possible. Months spent on over-engineered prototypes or pixel-perfect design systems delay the only metric that now drives valuation—paying customers and revenue growth.
Every week you spend building before you can sell is a week you're not generating the growth signal the market rewards. Speed to revenue-generating product isn't just an operational advantage; it's a valuation strategy.
Category Selection Is Now a Funding Strategy
Kroll's data makes category positioning a first-order strategic decision. If your MVP operates in a category the market believes AI will automate away, you'll face valuation pressure regardless of your growth and margins. If you're building tools that make AI or technical work more powerful, you need to emphasize that angle in every pitch, demo, and product message.
This doesn't mean abandoning categories under pressure—it means positioning matters. A customer experience tool positioned as "AI-powered chatbot support" will trade at a discount. The same underlying technology positioned as "engineering productivity copilot" may command a premium. Investors and acquirers are buying stories about which side of the AI divide you're on.
Your MVP's messaging, demo flow, and positioning need to reflect the category perception you want to own. That clarity needs to be embedded in the product from day one, not bolted on later when you're pitching.
Key Takeaways
- Margins above 25% add almost no valuation premium—growth is what acquirers and investors pay for
- Identical Rule of 40 scores now produce 73% valuation spreads based on category alone
- Marketing and customer experience software trade at the lowest multiples; engineering and cybersecurity command the highest
- Category positioning is a funding strategy—the market prices future AI durability, not just current metrics
- Speed to revenue-generating product is a valuation lever—every delay costs you growth signal
The death of the Rule of 40 as a universal valuation driver doesn't mean fundamentals don't matter. It means the fundamentals that matter have changed. Growth, category positioning, and speed to market now determine what your company is worth. If you're still optimizing for margin efficiency while your competitors are optimizing for revenue traction in AI-durable categories, you're solving yesterday's problem.
The fastest way to test category positioning and generate growth signal is to get a working, sellable product in front of customers. Not a prototype. Not a design mockup. A full product that can close deals and generate revenue.