Meaning and transaction use
An SEC filing describes contribution-margin analysis for customers acquired in a specified fiscal-year cohort and states which shared costs are excluded. [S1]
Another SEC filing explains that its customer cohorts are grouped by the year customers first signed subscription agreements and uses a consistent observation month. [S2]
Proposed control method: freeze each cohort definition and reconcile member-level activity through the observation periods.
Worked example
Illustrative customer cohort only. Assume 1,000 customers were acquired in Q1; 760 remain active after six months and 640 after twelve months.
Scroll the table horizontally to view all columns.
| Measure | Calculation | Result |
|---|---|---|
| Opening customers | Given | 1,000 |
| Six-month retention | 760 / 1,000 | 76.0% |
| Twelve-month retention | 640 / 1,000 | 64.0% |
| Loss from month 6 to month 12 | 760 - 640 | 120 customers |
The illustrative cohort retains 64.0% of opening customers at month 12.
Proposed transaction review process
Define cohorts
Choose the start event, period, segment and measure.
Reconcile members
Assign each customer once and retain source identifiers.
Track elapsed time
Measure activity, revenue, margin and retention consistently.
Compare and act
Identify changes by cohort and test operational drivers.
Evidence checklist
Membership
Customer identifier, start event and cohort period.
Activity
Orders, usage, billing, credits and cancellations.
Economics
Revenue, variable cost, contribution and acquisition spend.
Definitions
Observation dates, reactivations, exclusions and data changes.
Decision framework
| Situation | Proposed action |
|---|---|
| Recent cohorts retain less | Test product, channel, pricing and onboarding drivers. |
| Cohorts have different maturity | Compare the same elapsed periods. |
| Reactivations are material | Report them under a consistent rule. |
| Contribution improves while retention falls | Assess price, mix and acquisition quality together. |
Common errors to check
- Comparing cohorts at different ages.
- Changing membership after the start date.
- Mixing customer and revenue retention.
- Ignoring channel or product mix changes.
Build the cohort evidence base
Bring customer-level starts, activity and economics to a cohort review. Reconcile retention and contribution by elapsed period.
Discuss the transactionPrimary references and editorial scope
- SEC filing: Customer-cohort contribution analysis
Example contribution analysis for a customer acquisition cohort and disclosed cost exclusions. Reference checked 17 September 2026. - SEC filing: Subscription customer cohorts
Example cohort grouping by subscription start year and consistent observation timing. Reference checked 17 September 2026.
General transaction education using public United States filings. Figures are hypothetical. Cohort results depend on the selected event, measure, period and data treatment.
General business information. Obtain advice appropriate to the legal, tax, accounting and financing facts. No offer, lender commitment or transaction outcome is represented. All worked examples use expressly assumed figures. Editorial draft date: 17 September 2026.
