NRR above 100% can coexist with customer losses. Expansion at a few large accounts may even hide erosion elsewhere. In SaaS diligence, understand the cohort behind the rate before concluding that customers are staying or that growth is durable.
Read two complementary measures
Gross revenue retention, or GRR, subtracts churn and contraction from the opening base. Net revenue retention, or NRR, also includes expansion within that same cohort. New customers should not offset losses in the calculation. Bessemer distinguishes these measures and notes that customer segment affects their interpretation. Bessemer, Scaling to $100 Million.
The measures answer different questions: how much of the base survives before expansion, and how does total revenue from existing customers evolve? Reporting only the stronger rate hides useful information. Ask for both, calculated over matching dates and under consistent rules.
Recalculate the cohort
Consider a teaching example separate from Sillage. A cohort starts with €100,000 in monthly revenue, loses €10,000 to churn and €5,000 to contraction, and adds €25,000 in expansion. GRR is 85%; NRR is 110%. The cohort now produces more revenue, but 15% of the opening amount disappeared before expansion.
Verify the result against customer-level records at the beginning and end of the period. Reconcile account renaming, mergers, and contract migrations. Moving a customer to a new legal entity should not artificially create a churn event followed by a new sale. Record adjustments explicitly so another reviewer can reproduce the result.
Segment where the economics differ
An overall rate may mix self-service small businesses with large accounts undergoing phased deployment. Segment by size, tenure, product, or channel when those differences affect adoption. The purpose is not to generate more tables. It is to understand whether the growth mechanism can repeat with future customers.
A historical market observation is not a universal investment threshold. Cohort maturity, contract duration, and price increases all affect the number. A young cohort may not have reached its first renewal, making an apparently strong rate less informative than it looks.
Connect retention with concentration
In Sillage, reported NRR of 112.2% is favorable, but it sits alongside GRR of 91.5% and a largest customer contributing 20% of MRR. The figures do not cancel each other out. They describe expansion and exposure at the same time. Fictional Sillage cohort schedule, in French.
Next ask what drives expansion: broader adoption, additional features, price changes, or contractual catch-up? Those mechanisms have different implications. Expansion that requires intensive implementation support should be assessed alongside the cost of deployment and ongoing service.
Turn the metric into an investment question
The useful conclusion is not just “strong retention.” It identifies the cohort, period, drivers, and possible weaknesses. Assign the next evidence requests: renewal commitments, site-level usage, reasons for churn, or expansion costs. A metric becomes actionable when it tells the team which economic assumption to test next.