Aug Concentration Lock: Residual Top-1 Holds 38% — Rebound Risk to 39.5%
August adaptation-economics concentration lock: H1-adjusted residual Top-1 (households & SMEs) stays ~38% (−2 pp vs FY), Top-3 ~86%; annualized rebound would push Top-1 toward ~39.5%; WBG still ~34% of the $35B MDB LMIC tip; gap geography Top-3 stuck at ~53%.
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Our 2026 concentration print put residual Top-1 (uninsured households & SMEs) near 40%, Top-3 near 87%, and protection-gap Top-3 regions near 53% of the $424B stock. The Q3 concentration lens then marked an H1-adjusted ease to about 38% / 86% after Swiss Re’s benign first half and the MDB Joint Summary’s $35B LMIC adaptation print. The August MDB + H1 update locked the levels. This August 202608 concentration lock asks the durability question: is the softer residual tip a durable deconcentration — or a quiet-half artifact that rebounds if H2 insurance ratios revert toward the FY ~29% framing?
The interactive dashboard above is built as that Aug 608 concentration lock. Toggle Scenario lock, Residual & hazards, MDB & donors, Vintage slope, and Gaps & scarcity. Flip the residual scenario among FY framing, H1 lock, and annualized rebound. The punchline is multi-sided on purpose. On the H1 lock, residual Top-1 stays about 38% (−2 pp vs FY) and Top-3 about 86% — HHI near 2,684. On the rebound scenario, Top-1 drifts back toward about 39.5% (+1.5 pp vs H1) if covered-sleeve shares compress. On MDB LMIC banks, World Bank Group remains about 34% of the $35B tip and Top-3 (WBG + ADB + IDB) about 68%. On protection-gap geography, Top-3 regions still hold about 52.6% of the $424B stock. On scarcity, AGR needs mid still runs roughly 9.6× MDB LMIC adaptation.
The August concentration scoreboard
| Lens | Top-1 | Top-3 | HHI | Δ / risk |
|---|---|---|---|---|
| Residual bearers (H1 lock) | 38% (households & SMEs) | 86% | ~2,684 | −2 pp vs FY |
| Residual rebound scenario | ~39.5% | ~86.5% | ~2,750 | +1.5 pp vs H1 |
| MDB LMIC adaptation banks | 34% (World Bank Group) | 68% | ~1,986 | +2 pp vs Conc '26 |
| Protection-gap geography | 22.4% (N. America) | 52.6% | ~1,518 | 0 pp |
| OECD adaptation donors | 18% (Germany) | 46% | ~1,124 | 0 pp |
| Public adaptation instruments | 67% (loans) | 100% (3 buckets) | ~5,346 | Extreme tip |
Read the table as a family of market shares plus a scenario band, not one number. August does not rewrite Q3’s H1 lock — it stress-tests it. The residual tip eased because insurance’s constructed share rose with H1’s 42% coverage ratio. The rebound row exists because that ratio is a quiet-half print, not a structural rewrite of who pays when the next severe season arrives. Gap geography and OECD donors remain the stuck meters: new flow prints did not redraw who holds uninsured exposure dollars or who supplies the bilateral tip.
Scenario lock: FY, H1, and rebound
Open Scenario lock. The paired Top-1 / Top-3 bars walk FY (40% / 87%) → H1 lock (38% / 86%) → rebound (~39.5% / ~86.5%). Residual HHI softens from about 2,826 to 2,684, then firms toward about 2,750 under rebound. Beside that panel, the ranked HHI scoreboard still puts residual incidence and public instruments in the high / extreme bands, MDB banks in the moderate-to-high band (~1,986), gap geography moderate (~1,518), and OECD donors plural (~1,124).
The insured-share composed chart is the damage-side twin of the scenario toggle: FY 2025 insured share ~29%, H1 2025 a severe half, H1 2026 benign at 42% on insured $42B against economic ~$100B. Scarcity multiples underneath remind the desk that even with a record MDB tip, needs mid ÷ MDB LMIC adaptation is still about 9.6×, needs ÷ OECD tip about 9.7×, and the protection-gap stock ÷ MDB about 12×. A quieter insured half does not close the unmet-demand concentration story.
Residual ladder and hazard burden
Switch to Residual & hazards and keep the scenario toggle live. The Lorenz curve under the H1 lock still rises far above the equal-split diagonal: 38% at households, 64% once sovereigns stack, 86% once insurance’s covered share is included. Toggle Share %, Cumulative %, and Δ vs FY pp. Under H1, households show −2 pp, sovereigns −1 pp, insurance +2 pp, MDB adapt +1 pp. Flip to rebound and the household tip thickens again — a constructed sensitivity, not a forecast, but the right risk band for desks that mark residual incidence to the newest damage print.
The stacked hazard burden panel is the Aug-specific cut. Drought / heat / crop remains household-heavy (~52% household / 35% sovereign / 13% insurance). Flood sits near 44 / 28 / 28. Storm and quake show thicker insured sleeves. Wildfire sits in between. The point is not a precision hazard extract — it is that Top-1 residual is not one weather story. A benign tropical-cyclone half can lift the global insurance ratio while drought and flood corridors still concentrate uninsured incidence on households and local budgets. Pair that with the Q3 concentration lens: Q3 established the H1 ease; August asks which hazard mix would unwind it.
MDB banks, donors, and the loan tip
Toggle MDB & donors. On estimated bank shares of MDB LMIC adaptation $35B (2025), World Bank Group leads near 34% (~$11.9B), ADB 20%, IDB 14%, AfDB 11%, EIB LMIC sleeve 9%, other MDBs 12%. Top-3 clears about 68%. These bank shares remain estimated from published MDB climate-finance patterns — not an official adaptation-only extract — and are labeled as such in the dashboard source note.
OECD donor bars stay the milder tip: Germany ~18%, Japan 16%, France 12%, Top-3 46% of $34.7B. The instrument donut still shows 67% loans / 29% grants. So the August lock is not “finance democratised.” It is “the largest institutional engine got larger (+31% YoY) while remaining bank-concentrated, and the bilateral tip remained plural-but-thin under a loan-heavy instrument mix.” The August update tracks the level bounce; this lens tracks who inside the club holds the tip — and whether residual incidence softens with it (it barely does).
Vintage slope: Q3 to Aug 608
Open Vintage slope. The multi-vintage line now walks Research → Concentration 2026 → Q3 concentration → Aug 608 lock. Residual Top-1 drifts 42% → 40% → 38% → 38%; residual HHI ~3,010 → ~2,826 → ~2,684 → ~2,684; gap Top-3 stays near 53%. Toggle slope metric among residual Top-1 / Top-3 / HHI / gap Top-3, and optionally overlay MDB Top-1 (null on research, then 32% → 34% → 34%).
August’s contribution is the flat lock plus the rebound risk band, not another −2 pp. Desks that treat “Aug vintage” as further deconcentration are reading a level update into a distribution that did not move. Desks that treat the H1 lock as permanent are ignoring the scenario panel. The right reading is: Q3 discovered the soft tip; August locks it and prices the unwind.
Gaps, scarcity, and who still pays
Toggle Gaps & scarcity. Protection-gap geography is unchanged in ranking: North America ~$95B (22.4%), South Asia, LAC, SSA, Western Europe, advanced APAC, MENA. Filter by Income and the resilience×gap scatter still lights up South Asia and SSA — low resilience, large absolute gap. Scarcity ledgers keep AGR needs mid (~$338B), the implied gap versus MDB $35B, OECD $34.7B, CPI $65B, UNEP $26B, and the FRLD delivered micro-print (~$0.45B of ~$0.82B pledged). Do not sum across ledgers.
Exposed: uninsured households and SMEs whose constructed share only fell 2 pp on a benign H1 and sits +1.5 pp higher under rebound; LMIC sovereigns borrowing into a 67% loan-heavy public tip; drought and flood corridors where household residual shares stay above 40%; regional corridors (SSA, South Asia) stuck in the low-resilience / large-gap quadrant; desks that treat MDB +31% YoY or H1 insured $42B as proof the residual tip deconcentrated for good.
Relative winners under current rules: advanced-economy insured systems that printed a higher H1 coverage ratio; World Bank Group and the Top-3 MDB bloc inside the $35B LMIC adaptation engine; grant niches inside the 29% public-adaptation grant sleeve; investors and cities that price residual incidence by bearer, hazard, and bank rather than by headline insured loss alone.
What would change the story: a severe season that pushes the insurance ratio back toward the FY ~29% framing and restores household Top-1 near 40%+; official MDB adaptation bank tables that break the estimated 34% / 68% tip; donor and grant diffusion that lifts UNEP/OECD/MDB numerators toward the $310–365B needs band; or resilience in developing regions that lifts the global index well above ~27%. None of those dominate the Aug 608 official vintages summarised here.
Caveats and methodology
- Residual bearer shares are a constructed incidence panel with explicit FY / H1-lock / rebound scenariosnot a single audited global ledger of who paid last year’s losses.
- Hazard burden mixes are constructed illustrative splits for dashboard comparison; they are not hazard-by-hazard insurance extracts.
- MDB bank shares of LMIC adaptation are estimated from published MDB climate-finance patterns and labeled estimatednot an official bank-by-bank adaptation extract from the Joint Summary.
- Regional protection-gap dollars are estimated allocations of the Swiss Re-style $424B stock; geography illustrates uninsured exposure, not a country extract.
- Donor country shares of OECD adaptation remain estimated from bilateral patterns.
- Do not splice OECD, UNEP, CPI, MDB, Swiss Re gap, and FRLD ledgers into one totaldifferent scopes, years, and methodologies.
- HHI is analytical on stated buckets (0–10,000). Primary sources: MDB Joint Summary (13 Jul 2026), OECD May 2026 climate finance, Swiss Re H1 2026 (11 Aug), UNEP Adaptation Gap Report 2025.
August locks the soft residual tip at 38% / 86% and refuses to pretend the tip cannot rebound. For levels see the August update; for the Q3 distribution discovery see the Q3 concentration lens; for the FY baseline see the 2026 concentration print; for theme structure see adaptation economics research.