Prior-Quarter Concentration
The top-customer ARR concentration reported in the PRIOR period — the comparison anchor for the current `customers.top_customer_concentration`. The board reads the two together to render the concentration trend on the bespoke customers card (rising concentration = growing single-account dependency risk). Common pitfall: comparing a top-1 concentration to a top-5 concentration across periods — keep the "top-N" cut identical. — Customers KPI, I'mBoard-authored (editorial tier).
I'mBoard-authored (editorial tier)
No public third-party standard anchors this KPI yet, so I'mBoard authors and maintains the definition — transparently labeled as editorial tier. See the ontology methodology for the published vs editorial tier system and the back-attribution workstream.
Rogue ID: customers.prior_quarter_concentration
Type: Percentage (%)
Domain: Customers
Definition
The top-customer ARR concentration reported in the PRIOR period — the comparison anchor for the current customers.top_customer_concentration. The board reads the two together to render the concentration trend on the bespoke customers card (rising concentration = growing single-account dependency risk). Common pitfall: comparing a top-1 concentration to a top-5 concentration across periods — keep the "top-N" cut identical.
Formula
Top-customer ARR concentration from the prior period, on the same top-N cut as the current `customers.top_customer_concentration`. concentrationTrend = top_customer_concentration − prior_quarter_concentration.Why it matters
Direction is the signal — rising concentration means a single account's health increasingly drives the whole book's risk.
How to interpret
A rising trend warrants a board note on the largest accounts' renewal timing and health. Hold the top-N cut constant across periods.
Calculation policy
How an AI agent should compute this KPI from messy company data. Free-text rules consumed at reasoning time — not a deterministic DSL. The most common ways to get this wrong are listed under Common miscomputations.
Inclusion rules
- The
customers.top_customer_concentrationvalue AS REPORTED for the immediately-prior reporting period — the prior-close snapshot. - Use the SAME top-N cut (top-1, top-5, top-10) as the current concentration metric.
- A percentage of total ARR, as of the prior period close.
Exclusion rules
- Any current-period activity.
- A prior value computed on a different top-N cut than the current metric.
Required inputs
- The prior period's reported top-customer concentration.
- Confirmation the top-N cut matches the current period.
Data-source priority
- The prior period's board-reported concentration figure.
- Re-derive from the prior-period ARR ledger on the matching top-N cut ONLY if no reported value exists.
Edge cases
- As-of semantics: the prior reporting-period CLOSE, never a trailing window.
- Top-N mismatch (top-1 vs. top-5 across periods): not comparable — keep the cut identical.
- An account merger between periods can step concentration up without new underlying risk — disclose.
Validation checks
concentrationTrend = top_customer_concentration − prior_quarter_concentration(in points).- Bounded 0–100%.
- Equals the prior period's reported concentration on an unchanged top-N cut.
Common miscomputations
- Comparing different top-N cuts across periods — produces a fake trend.
- Using a trailing window instead of the explicit prior-quarter close.
- Recomputing on the current book instead of using the prior snapshot.
Related KPIs
customers.top_customer_concentrationcustomers.arr_at_riskcustomers.percent_arr_at_risk
Source
I'mBoard editorial — authored and maintained by I'mBoard, first published 2026-04-01. No third-party standard is cited for this KPI; when one emerges, the definition is back-attributed and promoted to the published tier (a minor version bump). Read the ontology methodology for the published vs editorial tier system, attribution rules, and dispute process.
Stage relevance
| Company stage | Priority |
|---|---|
| Series A | Core |
| Series B | Core |
| Series C+ | Core |
| Public | Core |
Suggested for stages: Series A, Series B, Series C+, Public.
Default owning functions
- Sales
- Finance
Machine-readable
- This KPI as JSON:
/api/ontology/customers/prior_quarter_concentration.json - All Customers KPIs:
/api/ontology/customers.json - Full catalog:
/api/ontology/index.json
Prior-Quarter ACV
The average contract value reported in the PRIOR period — the comparison anchor for the current `customers.avg_contract_value`. The board reads the two together to render the ACV trend chip on the bespoke customers card (delta + direction) without recomputing it. Common pitfall: comparing a prior new-logo ACV to a current blended-base ACV — keep the population definition identical across the two periods or the trend is an artifact. — Customers KPI, I'mBoard-authored (editorial tier).
Prior-Quarter GRR
Gross Revenue Retention reported in the PRIOR period — the comparison anchor for the current `customers.gross_revenue_retention`. The board reads the two together to render the GRR trend on the bespoke customers retention grid. Per the SMSB GRR definition (excludes expansion, capped at 100%), both periods must use the same cohort basis for the delta to mean anything. Common pitfall: reading a GRR trend without the matching NRR trend — the gap between them is the expansion signal. — Customers KPI, I'mBoard-authored (editorial tier).