Ewoud Bom, managing director of Achmea Reinsurance, priced his fifth catastrophe bond in June 2026 and got a number few sponsors of non-peak perils have seen: a 3.75% spread on the upsized €100 million Windmill III Re 2026-1 notes, below the 4.25% floor of initial guidance, against a 2.58% expected loss (Artemis, June 2026). The resulting 1.45x multiple undercut even what debut sponsors paid this spring.

A Third Bigger and Cheaper Than the Marketing Started

Achmea Reinsurance Company N.V., the group reinsurer for the Dutch mutual insurer Achmea, opened bookbuilding on Windmill III Re DAC (2026-1) with a €75 million target and price guidance of 4.25% to 5.00% over a 2.58% expected loss. Gallagher Securities, sole structuring agent and bookrunner, revised guidance down to 3.75% to 4.25% as the book filled, and the deal ultimately upsized by a third to €100 million while pricing at the bottom of the reduced range (Artemis, June 2026). That sequence, upsize plus a guidance cut of a full point off the initial ceiling, is the signature of a book that was oversubscribed early and stayed that way.

The Class A notes, issued through the Ireland-domiciled Windmill III Re DAC and registered under Rule 144A, cede European windstorm and severe convective storm losses, including hail and tornado, to Achmea Reinsurance Company N.V. on behalf of the group's Dutch primary carriers Achmea Schadeverzekeringen N.V. and N.V. Hagelunie (Reinsurance News, June 2026). Coverage runs four years, July 1, 2026 through June 30, 2030, attaching at €500 million and exhausting at €650 million in Achmea's tower (Artemis Deal Directory). RMS models the layer. "This Windmill III Re Series 2026-1 issuance is a continuation of our strategy to diversify our access to reinsurance capacity worldwide and to broaden and strengthen our relationships with capital market investors," Bom said, adding that the reception "confirmed" the value of transferring risk to capital markets investors (Artemis, June 2026).

Windmill III Re 2026-1 is not Achmea's first bond in this layer. Windmill III Re 2024-1, also €100 million after its own upsize from a €75 million target, remains outstanding through June 2028, meaning Achmea now runs two Windmill bonds concurrently for the first time, €200 million of capital markets-backed windstorm capacity layered on top of its traditional program. Achmea's 2024 deal itself replaced a maturing 2020 vintage, Windmill II Re DAC, that provided a comparable €100 million of cover (Artemis). Five issuances since the program's launch is a track record few European primary-line cedants outside Zurich, Hannover Re, and a handful of others can match, and it is the reason Achmea's book prices tightly: investors have four years of loss experience and reporting discipline to underwrite against, not a blind debut.

Ultimate Net Loss, Not an Index: The Trigger Achmea Chose

Windmill III Re 2026-1 triggers on an indemnity basis, ultimate net loss to Achmea Reinsurance Company N.V. on a per-occurrence footing, the same structure Achmea has used across all five of its Windmill issuances (Reinsurance News; Artemis Deal Directory). That is a real choice, not a default. European windstorm cedants can also access the capital markets through an industry-loss index trigger, most commonly referencing PERILS AG's published market-wide loss estimates for a named windstorm, which several sponsors in the sector use instead of, or alongside, indemnity cover.

The two structures allocate risk differently, and the difference is the actuarial substance behind an otherwise routine renewal. An indemnity, ultimate-net-loss trigger pays Achmea based on its own actual, developed losses from the covered event, which eliminates basis risk for the cedant: whatever Achmea's book actually loses within the layer is what recovers, regardless of how the broader Dutch or European windstorm market performs. The cost is on the investor side and in the collateral mechanics. Ultimate net loss by definition develops over time as claims are adjusted, so the notes carry extension provisions that can hold collateral beyond the nominal maturity while a loss finalizes, and investors must trust Achmea's claims administration and audit rights rather than a published index. An industry-loss trigger inverts that trade: it pays fast, off a PERILS estimate published on a fixed timetable, with far less collateral extension risk, but it leaves the cedant exposed to basis risk whenever its own portfolio's loss ratio diverges from the market-wide index, a real possibility for a book concentrated in the Netherlands rather than spread evenly across PERILS' pan-European footprint. Achmea's five-for-five preference for indemnity signals it values a precise reserve offset over faster investor payout mechanics, a defensible position for a cedant whose primary exposure sits in one country's windstorm and hail loss experience rather than a continental average.

The Multiple Tells the Sharper Story

Spread and expected loss in isolation understate how far this deal moved. The ratio of the two, the multiple, is the cleaner risk-adjusted price signal, and it compressed harder than either number alone suggests. Windmill III Re 2024-1 priced at a 5.25% spread over a 2.19% expected loss, a 2.40x multiple. Windmill III Re 2026-1 priced at 3.75% over 2.58% expected loss, a 1.45x multiple, a 39% drop in risk-adjusted pricing in two years on the same €500 million to €650 million layer. Notably, the expected loss itself rose 18% between the two vintages, almost certainly reflecting updated RMS exposure and inflation adjustments to Achmea's insured values. Investors are accepting more modeled risk for proportionally far less premium, the clearest possible evidence that capacity, not risk appetite, is what moved.

That 1.45x sits below where the broader cat bond market cleared in the same quarter. The market-wide multiple fell to 2.53x in the second quarter of 2026, the first time it dropped below 3.0x since 2021's 2.23x, while the average spread over expected loss across all Q2 issuance was 3.74%, the lowest quarterly reading since the first quarter of 2023 and the first sub-4% quarter in twenty consecutive quarters (Artemis Q2 2026 Catastrophe Bond and ILS Market Report). Windmill priced below both benchmarks. It also priced tighter than what debut sponsors paid five weeks earlier: Woody Re 2026-1, a first-time issuance on Gallagher Re's Arthur Re platform, cleared at an 8.25% spread over a 3.88% expected loss, a 2.13x multiple, still far above Achmea's 1.45x despite Achmea's peril, European windstorm and severe convective storm, historically carrying less abundant model validation data than US hurricane or California earthquake. Gallagher Securities separately clocked overall cat bond pricing down more than 20% year over year as of March 2026, with the non-seasonality-adjusted market multiple at 2.29x, "nearing a historic low" (Artemis, March 2026). A seasoned, indemnity-triggered, non-peak-peril European sponsor now prices tighter than the market's own multiple benchmarks and tighter than debut names on a hot Atlantic-hurricane-adjacent platform. That is the signal peak-peril issuance data alone cannot show: capacity is deep enough to chase the perils that historically sat at the back of the ILS queue.

Metric Windmill III Re 2024-1 Windmill III Re 2026-1 Woody Re 2026-1 (debut) Q2 2026 Market Average
Size €100M €100M N/A N/A
Expected loss 2.19% 2.58% 3.88% N/A
Spread 5.25% 3.75% 8.25% 3.74% avg. over EL
Multiple 2.40x 1.45x 2.13x 2.53x

Pricing the Cedant's Real Choice: Cat Bond Versus Traditional Retro

A below-guidance upsize is more than a placement statistic for Achmea's actuarial team; it resets the make-or-buy comparison against traditional European windstorm retrocession at the next renewal. Traditional property catastrophe pricing softened alongside the capital markets: global property cat rate-on-line fell 16% at the July 1, 2026 renewal, per Guy Carpenter's benchmark index, the steepest annual decline in the series since 2014 (Reinsurance News, July 2026). Non-loss-impacted US property retro fell 5% to 15% in the same cycle, and North American property cat overall softened 20% to 25% (Gallagher Re, First View, July 2026). Traditional retro got cheaper too. The question for Achmea's tower design is which channel got cheaper faster, and by how much, relative to the certainty each provides.

The traditional retro alternative reprices annually and carries counterparty credit risk against the panel of reinsurers writing the layer; it is flexible if the cedant's exposure profile shifts, but it exposes the cedant to renewal risk exactly when the market might harden again. The cat bond alternative locks in the 3.75% spread and the €500 million to €650 million attachment for four full years, fully collateralized in a special-purpose vehicle with no counterparty credit exposure to a reinsurer's balance sheet, but it forfeits the ability to walk the layer down or renegotiate terms mid-term if Achmea's own loss experience or capital position changes. At 1.45x, the cat bond's risk-adjusted cost sits meaningfully below where the traditional market has been pricing comparable windstorm excess layers through 2026, which is precisely why running €200 million concurrently, rather than replacing one Windmill vintage with the next, now clears Achmea's hurdle rate. Locking in sub-2x multiples for a rolling four-year horizon, while dedicated reinsurance capital sits at record levels and shows no near-term sign of a hard-market reversal, is a defensible actuarial bet that the capital markets channel will remain the cheaper source of this specific layer through 2028, when the 2024 vintage next comes up for renewal.

One Deal Inside a Record Quarter

Windmill III Re 2026-1 closed inside the largest quarter the cat bond market has ever recorded. Q2 2026 produced more than $11.3 billion of new risk capital across 48 transactions and 80 tranches, with nine first-time sponsors entering the market, itself a quarterly record (Reinsurance News, July 2026). First-half 2026 issuance reached nearly $18 billion, the second-largest half-year on record behind only 2025's full-year pace, and the outstanding market closed the quarter at a record $65.6 billion, up from $61.3 billion at year-end 2025 (Artemis Q2 2026 Catastrophe Bond and ILS Market Report). Windmill's own contribution, €100 million against a $65.6 billion outstanding base, is a rounding error at the market level. What it demonstrates at the cedant level is not.

A European windstorm bond is precisely the kind of transaction that should be an outlier if capacity constraints were still binding anywhere in the ILS market: a non-peak, non-US, model-thinner peril from a repeat but still mid-sized sponsor. Instead it upsized by a third, cleared guidance cuts twice, and priced inside both the market's own quarterly average and what debut sponsors paid on the hottest platform of the year. For reinsurance actuaries building 2027 retrocession and program-optimization assumptions, the read is not that peak perils are cheap, that has been documented for two years running. It is that the ILS investor base has grown deep and diversified enough to underwrite the perils that used to be considered too idiosyncratic, too model-uncertain, or too small to reliably clear a book. Achmea's fifth issuance is the evidence that the frontier of what capital markets will price efficiently has moved, and cedant actuaries recalculating optimal cession structures for 2027 renewals should treat that frontier, not last year's traditional retro quote, as the live constraint.

Further Reading

Sources

  1. Artemis, “Achmea Secures One-Third Upsized €100m Windmill III Re 2026-1 Catastrophe Bond,” Artemis.bm, June 2026
  2. Artemis, “Achmea Raises Windmill III Re 2026-1 Cat Bond Target to €100m, Price Guidance Lowered,” Artemis.bm, June 2026
  3. Reinsurance News, “Achmea Reinsurance Secures €100m of European Windstorm & Severe Thunderstorm Retro With Latest Cat Bond,” Reinsurancene.ws, June 2026
  4. Artemis Deal Directory, “Windmill III Re DAC (2026-1),” Artemis.bm
  5. Artemis Deal Directory, “Windmill III Re DAC (2024-1),” Artemis.bm
  6. Artemis, Q2 2026 Catastrophe Bond & ILS Market Report, Artemis.bm, July 2026
  7. Reinsurance News, “Catastrophe Bond Issuance Exceeds $11.3bn in Record Second Quarter: Artemis,” Reinsurancene.ws, July 2026
  8. Reinsurance News, “Global Property Cat Rates Down 16% as Softening Extends into July Renewals: Guy Carpenter,” Reinsurancene.ws, July 2026
  9. Artemis, “Cat Bond Prices Drop 20%+ YoY, Investors Willing to Support Riskier Tranches: Gallagher Securities,” Artemis.bm, March 2026