Catastrophe Bonds and ILS in 2026: The Quietly Maturing Climate Capital Market

Outstanding Capital at USD 47B, 2024 Issuance USD 17.7B #

The cat bond market closed 2024 with USD 47.0B of risk capital outstanding across 144A property and casualty deals, per the Artemis Deal Directory snapshot. That is a USD 16B expansion off the USD 31B end 2022 baseline, or 52 percent growth in 24 months, the steepest two year build in the asset class history. Inclusive of cat bond lite, private ILS, sidecars, and collateralized reinsurance, total ILS capital sits around USD 117B (Aon Securities, ILS Annual Report 2025), with traditional 144A bonds the fastest growing slice.

Primary issuance reached USD 17.7B in 2024 across approximately 79 transactions (Aon Securities), narrowly surpassing the USD 16.4B record set in 2023 across 70 deals. Issuance has now exceeded USD 15B in three consecutive calendar years, a regime shift from the 2018 to 2022 average of USD 10.4B. Q2 2024 alone printed USD 8.4B, the heaviest single quarter on record (Artemis quarterly tracker), as Florida wind sponsors front loaded ahead of the June 1 reinsurance renewal.

The Q1 2025 pipeline added USD 4.5B and Q2 2025 cleared USD 9B, suggesting full year 2025 issuance will challenge the 2024 ceiling. The market structurally cleared a credibility threshold in 2024: investors digested record supply, hurricane peak season losses, and tightening spreads simultaneously without dislocation. Average deal size rose to USD 224M in 2024 from USD 198M in 2022, signaling sponsor scale rather than fragmentation.

Beryl, Helene, Milton: USD 90B Insured Loss, Zero Cat Bond Impairments #

The 2024 North Atlantic hurricane season produced 18 named storms, 11 hurricanes, and five major hurricanes, an above average count concentrated in two punishing landfalls. Hurricane Helene struck the Florida Big Bend on September 26, 2024 as a Category 4, then drove inland flooding through North Carolina, Tennessee, and Virginia. Hurricane Milton followed on October 9, 2024, hitting Siesta Key Florida as a Category 3 after rapid intensification to Category 5 over the Gulf. Hurricane Beryl earlier set a July intensification record before its July 8 Texas landfall.

Aon Impact Forecasting and Munich Re NatCatSERVICE estimates put 2024 global insured natural catastrophe losses at USD 145B, with the Atlantic hurricane share alone above USD 90B inclusive of NFIP and private flood. Helene insured loss landed at roughly USD 17.5B (Munich Re), Milton at USD 25B to USD 35B (Aon), Beryl at USD 3.5B. Despite that, no rated 144A catastrophe bond suffered principal write down attributable to the 2024 season. Cat bond lite and aggregate covers saw modest mark to market drawdown, but trigger thresholds (typically PCS industry index above USD 30B per occurrence for Florida wind transactions, or modeled loss above sponsor specific attachment) held.

The clean outcome partly reflects the post 2017 to 2022 lesson: sponsors moved attachment points materially higher, indemnity triggers tightened wording on hours clauses and reinstatements, and PCS industry loss index calibration improved. Investor recovery on the Residential Re, Mystic Re, and Sanders Re shelves remained intact, validating the price discovery investors enforced through 2023.

Spread Compression: 4.7x Multiple Peak Falling Toward 3.5x EL #

Risk pricing tells the discipline story. The weighted average primary issuance multiple, defined as coupon spread over expected loss, peaked at 4.7x in Q3 to Q4 2023 (Lane Financial and Artemis tracker), the highest since 2009. As capital flowed back into the asset class through 2024, the multiple compressed to 3.5x by Q4 2024, with some Florida wind tranches printing as low as 2.8x for remote layers. Munich Re Cat Bond Index spreads narrowed from 1100 basis points in October 2023 to 720 basis points by December 2024.

Even at compressed multiples, all in coupons remained historically attractive. The Swiss Re Cat Bond Total Return Index delivered 19.7 percent in 2023 and 11.6 percent in 2024, comfortably outpacing US high yield and emerging market sovereign debt on a risk adjusted basis. Sharpe ratios across the rolling three year window cleared 2.0 for diversified cat bond portfolios (LGT Capital Partners, Twelve Capital quarterly letters), well above the 0.6 to 0.9 typical of corporate credit.

January 2025 reinsurance renewal pricing came in flat to up 5 percent for loss free property catastrophe layers (Howden, Gallagher Re), a sharp deceleration from the up 30 percent to 50 percent pricing of January 2023. Retro pricing held flat. The pricing trajectory implies cat bond multiples could compress another 30 to 50 basis points through 2026 absent a major loss event, settling around 3.0x to 3.3x EL on average primary issuance. That level still clears institutional return hurdles given the genuine zero correlation profile against equity and credit cycles.

Peak Peril Concentration: US Wind, US Quake, EU Windstorm, Japan Typhoon #

Cat bond peril composition remains heavily skewed to four peak zones. US named storm (predominantly Florida and Gulf wind) accounts for roughly 62 percent of outstanding limit, followed by US earthquake at 14 percent, multi peril aggregate covers at 9 percent, EU windstorm at 6 percent, and Japan typhoon and earthquake combined at 5 percent (Artemis 2024 Q4 outstanding analysis). The remainder spans Australia cyclone, Mexico quake, Turkey quake, Canada quake, and a thin but growing cyber and mortgage tail.

Concentration risk is the primary structural drag on capacity. Investors have pushed sponsors to diversify, but the underlying insured exposure imbalance means new capital naturally clusters in Florida and California. The 2024 issuance mix included USD 6.2B of pure Florida wind cover, USD 2.0B from State of Florida Reinsurance Assistance Program (SRA), and USD 1.6B of California earthquake limit through the California Earthquake Authority Ursa Re shelf.

The SRA inaugural USD 2B 2024 issuance, sponsored by the Florida Office of Insurance Regulation, marked a structural deepening: state level public reinsurance backstops can now tap capital markets directly rather than relying solely on Citizens Property Insurance Corporation. PCS (Property Claim Services, a Verisk subsidiary) industry loss index calibration, the workhorse trigger for 38 percent of outstanding limit, was refreshed in 2024 to better reflect demand surge and loss adjustment expense in compound events, addressing a long standing investor concern after Hurricane Ida.

Vermont and Bermuda Dominance, Sponsor Flow from USAA, Allstate, Citizens #

Special purpose insurer (SPI) domicile economics matter to issuance. Vermont captured roughly 50 percent of new ILS formations in 2024 (Vermont Department of Financial Regulation captive report), reflecting its 2018 sponsored captive statute, low premium tax, and proximity to US sponsors. Bermuda remains the dominant 144A cat bond domicile by outstanding capital, hosting Mystic Re (Everest Re), Long Point Re (Travelers), Sanders Re (Allstate), Residential Re (USAA), Watershed Re (Progressive), and Everglades Re (Florida Citizens). The Cayman Islands and Singapore cover the residual.

Sponsor concentration is real but moderating. USAA returned to market with two Residential Re tranches totaling USD 525M, retaining its position as the longest running cat bond sponsor (1997 inception). Allstate priced Sanders Re tranches across the year. Florida Citizens issued USD 1.5B through Everglades Re. Everest Re's Mystic Re shelf cleared USD 750M. Progressive's Watershed Re funded a USD 400M auto physical damage parametric layer, an expansion beyond traditional property wind. New entrants in 2024 included Hannover Re, AXA, Generali, and a first time sovereign Mexican Pacific quake transaction sponsored by FONDEN.

On the buy side, dedicated ILS asset managers run roughly USD 110B of capital across the cat bond and private ILS continuum. The leading pool: Fermat Capital Management (USD 11.5B), Credit Suisse Insurance Linked Strategies now Schroders Capital (USD 5.8B), LGT Capital Solutions (USD 8.5B), Twelve Capital (USD 5.2B), Securis Investment Partners (USD 4.5B), ILS Capital Management (USD 3.3B), and Stone Ridge (USD 7.5B). Pension funds (PensionDanmark, AP funds, OMERS, Healthcare of Ontario Pension Plan) and sovereign wealth funds increasingly access through these dedicated platforms rather than direct underwriting.

2026 Outlook: Capital Inflow, Spread Compression, Peril Diversification #

The 2026 setup leans constructive. The hard reinsurance market rebuilt cedent willingness to pay risk adjusted prices, the 2024 hurricane season validated trigger discipline, and absolute coupons remained competitive against high yield and private credit. Aon Securities pipeline tracking suggests 2025 full year issuance lands in the USD 17B to USD 19B band. Outstanding capital plausibly clears USD 50B by year end 2025 and approaches USD 55B through 2026 if no major loss event materializes.

Three structural deepenings to watch. First, cyber cat bonds: Beazley, Axis, and Hannover Re have priced four cyber 144A transactions totaling USD 615M since December 2023, with investor appetite materially exceeding initial estimates. Second, mortgage ILS: Bellemeade Re and Eagle Re from Arch and Radian continue clearing USD 3B to USD 4B annually, an underappreciated diversifier. Third, parametric and second event triggers: the Watershed Re auto parametric and the Mexican FONDEN quake layer suggest the next decade of innovation runs through structure, not just peril.

The risks. Spread compression below 3.0x EL would erode the asset class margin of safety. Climate model recalibration following Helene inland flooding losses could shift attachment points and reduce capacity for compound peril events. Florida assignment of benefits litigation reform, while passing in 2022 and 2023, has not fully worked through claims pipelines. And the always present tail: a USD 200B insured loss season, plausible under Munich Re modeled return periods every 15 to 20 years, would test the post 2017 trigger discipline that 2024 only partially stressed. For institutional allocators, the strategic answer remains a 2 to 5 percent diversified ILS allocation. The Sisyphean truth of catastrophe risk capital, the boulder always rolls back, is also why the asset class compounds: the work is never done, the premium never disappears.

Sources #

• Artemis Catastrophe Bond and ILS Deal Directory and Quarterly Tracker
• Insurance Linked Securities Annual Report 2025
• sigma 1/2025: Natural Catastrophes in 2024
• Munich Re Natural Catastrophe Review 2024
• Swiss Re Global Cat Bond Total Return Index
• January 2025 Reinsurance Renewal Report
• Reinsurance Market Report Mid Year 2024
• AM Best Insurance Linked Securities Market Review 2024
• Vermont Captive Insurance Annual Report 2024
• Florida Reinsurance Assistance Program Inaugural Issuance Coverage
• PCS Catastrophe Loss Index Methodology Update 2024
• Lane Financial Quarterly ILS Market Review Q4 2024