v3.26.1
Fair value
 3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Fair value Fair value
Recurring fair value measurements
We hold fixed maturity securities, which are carried at fair value. The fair value of fixed maturity securities are estimated primarily based on information derived from third-party pricing services (“pricing services”), internal models and/or broker quotes, which use a market approach, income approach or a combination of the market and income approach depending on the type of instrument and availability of information. In general, a market approach is utilized if there is readily available and relevant market activity for an individual security. In certain cases where market information is not available for a specific security but is available for similar securities, that security is valued using market information for similar securities, which is also a market approach. When market information is not available for a specific security (or similar securities) or is available but such information is less relevant or reliable, an income approach or a combination of a market and income approach is utilized. For securities with optionality, such as call or prepayment features (including asset-backed securities), an income or combination approach may be used. These valuation techniques may change from period to period, based on the relevance and availability of market data.
Further, while we consider the valuations provided by pricing services and broker quotes to be of high quality, management determines the fair value of our investment securities after considering all relevant and available information.
In general, we first obtain valuations from pricing services. If prices are unavailable for public securities, we obtain broker quotes. For all securities, excluding certain private fixed maturity securities, if neither a pricing service nor broker quotes valuation is available, we determine fair value using internal models. For certain private fixed maturity securities where we do not obtain valuations from pricing services, we utilize an internal model to determine fair value since transactions for similar securities are not readily observable and these securities are not typically valued by pricing services.
Given our understanding of the pricing methodologies and procedures of pricing services, the securities valued by pricing services are typically classified as Level 2 unless we determine the valuation process for a security or group of securities utilizes significant unobservable inputs, which would result in the valuation being classified as Level 3.
Broker quotes are typically based on an income approach given the lack of available market data. As the valuation typically includes significant unobservable inputs, we classify the securities where fair value is based on our consideration of broker quotes as Level 3 measurements.
For private fixed maturity securities, we utilize an income approach where we obtain public bond spreads and utilize those in an internal model to determine fair value. Other inputs to the model include
rating and weighted-average life, as well as sector which is used to assign the spread. We then add an additional premium, which represents an unobservable input, to the public bond spread to adjust for the liquidity and other features of our private placements. We utilize the estimated market yield to discount the expected cash flows of the security to determine fair value. We utilize price caps for securities where the estimated market yield results in a valuation that may exceed the amount that would be received in a market transaction. When a security does not have an external rating, we assign the security an internal rating to determine the appropriate public bond spread that should be utilized in the valuation. While we generally consider the public bond spreads by sector and maturity to be observable inputs, we evaluate the similarities of our private placement with the public bonds, any price caps utilized, liquidity premiums applied, and whether external ratings are available for our private placements to determine whether the spreads utilized would be considered observable inputs, and therefore be classified as Level 2. We classify private securities without an external rating or public bond spread as Level 3. In general, a significant increase (decrease) in credit spreads would have resulted in a significant decrease (increase) in the fair value for our fixed maturity securities as of March 31, 2026.
For remaining securities priced using internal models, we determine fair value using an income approach. We maximize the use of observable inputs but typically utilize significant unobservable inputs to determine fair value. Accordingly, the valuations are typically classified as Level 3.
Our assessment of whether or not there were significant unobservable inputs related to fixed maturity securities was based on our observations obtained through the course of managing our investment portfolio, including interaction with other market participants, observations related to the availability and consistency of pricing and/or rating, and understanding of general market activity such as new issuance and the level of secondary market trading for a class of securities. Additionally, we considered data obtained from pricing services to determine whether our estimated values incorporate significant unobservable inputs that would result in the valuation being classified as Level 3.
A summary of the inputs used for our fixed maturity securities and short-term investments based on the level in which instruments are classified is included below. We have combined certain classes of instruments together as the nature of the inputs is similar.
Level 1 measurements
There were no fixed maturity securities classified as Level 1 as of March 31, 2026, and December 31, 2025.
Level 2 measurements
Fixed maturity securities:
Third-party pricing services
In estimating the fair value of fixed maturity securities, approximately 91% of our portfolio was priced using third-party pricing services as of March 31, 2026. These pricing services utilize industry-standard valuation techniques that include market-based approaches, income-based approaches, a combination of market-based and income-based approaches or other proprietary, internally generated models as part of the valuation processes. These third-party pricing vendors maximize the use of publicly available data inputs to generate valuations for each asset class. Priority and type of inputs used may change frequently as certain inputs may be more direct drivers of valuation at the time of pricing. Examples of significant inputs incorporated by pricing services may include sector and issuer spreads, seasoning, capital structure, security optionality, collateral data, prepayment assumptions, default assumptions, delinquencies, debt covenants, benchmark yields, trade data, dealer quotes, credit ratings, maturity and weighted-average life. We conduct regular meetings with our pricing services for the purpose of understanding the methodologies, techniques and inputs used by the third-party pricing providers.
The following table presents a summary of the significant inputs used by our pricing services for certain fair value measurements of fixed maturity securities that are classified as Level 2 as of March 31, 2026:
(Amounts in thousands)
Fair value
Primary methodologies
Significant inputs
U.S. government, agencies and GSEs$268,722 Price quotes from trading desk, broker feedsBid side prices, trade prices, Option Adjusted Spread (“OAS”) to swap curve, Bond Market Association OAS, Treasury Curve, Agency Bullet Curve, maturity to issuer spread
State and political subdivisions$469,832 Multi-dimensional attribute-based modeling systems, third-party pricing vendorsTrade prices, material event notices, Municipal Market Data benchmark yields, broker quotes
Non-U.S. government$179,543 Matrix pricing, spread priced to benchmark curves, price quotes from market makersBenchmark yields, trade prices, broker quotes, comparative transactions, issuer spreads, bid-offer spread, market research publications, third-party pricing sources
U.S. corporate$2,404,183 Multi-dimensional attribute-based modeling systems, broker quotes, price quotes from market makers, internal models, OAS-based modelsBid side prices to Treasury Curve, Issuer Curve, which includes sector, quality, duration, OAS percentage and change for spread matrix, trade prices, comparative transactions, Trade Reporting and Compliance Engine (“TRACE”) reports
Non-U.S. corporate$699,923 Multi-dimensional attribute-based modeling systems, OAS-based models, price quotes from market makersBenchmark yields, trade prices, broker quotes, comparative transactions, issuer spreads, bid-offer spread, market research publications, third-party pricing sources
Residential mortgage-backed$341,038 OAS-based models, single factor binomial models, internally pricedPrepayment and default assumptions, aggregation of bonds with similar characteristics, including collateral type, vintage, tranche type, weighted-average life, weighted-average loan age, issuer program and delinquency ratio, pay up and pay down factors, TRACE reports
Commercial mortgage-backed$191,214 Multi-dimensional attribute-based modeling systems, pricing matrix, spread matrix priced to swap curves, Trepp commercial mortgage-backed securities analytics modelCredit risk, interest rate risk, prepayment speeds, new issue data, collateral performance, origination year, tranche type, original credit ratings, weighted-average life, cash flows, spreads derived from broker quotes, bid side prices, spreads to daily updated swaps curves, TRACE reports
Other asset-backed$1,012,097 Multi-dimensional attribute-based modeling systems, spread matrix priced to swap curves, price quotes from market makersSpreads to daily updated swap curves, spreads derived from trade prices and broker quotes, bid side prices, new issue data, collateral performance, analysis of prepayment speeds, cash flows, collateral loss analytics, historical issue analysis, trade data from market makers, TRACE reports
Internal models
A portion of our Level 2 U.S. corporate and non-U.S. corporate securities are valued using internal models. The fair value of these fixed maturity securities was $230.4 million and $82.5 million, respectively, as of March 31, 2026. Internally modeled securities are primarily private fixed maturity securities where we use market observable inputs such as an interest rate yield curve, published credit spreads for similar securities based on the external ratings of the instrument and related industry sector of the issuer. Additionally, we may apply certain price caps and liquidity premiums in the valuation of private fixed maturity securities. Price caps and liquidity premiums are established using inputs from market participants.
The following tables present additional information about assets measured at fair value on a recurring basis and for which we have utilized significant unobservable (Level 3) inputs to determine fair value as of or for the dates indicated:
 Beginning balance as of January 1, 2026
Total realized and
unrealized gains
(losses) 
Purchases
Sales
Settlements
Transfer
into
Level 3 (1)
Transfer
out of
Level 3 (1)
Ending balance as of March 31, 2026
Total gains
(losses)
attributable to
assets still held
(Amounts in thousands)
Included
in net
income
Included
in OCI
Included
in net
income
Included
in OCI 
Fixed maturity securities:           
U.S. corporate$197,721 $490 $(1,599)$— $— $(7,222)$— $— $189,390 $490 $(1,606)
Non-U.S. corporate34,411 18 (425)— — (105)— — 33,899 18 (425)
Residential mortgage-backed483 (1)(2)— — (34)— — 446 (1)(2)
Commercial mortgage-backed7,467 1 (50)— — — — — 7,418 1 (50)
Other asset-backed18,831 12 (33)7,499 — (18)2,000 (5,132)23,159 10 (47)
Total$258,913 $520 $(2,109)$7,499 $— $(7,379)$2,000 $(5,132)$254,312 $518 $(2,130)
Beginning balance as of January 1, 2025
Total realized and
unrealized gains
(losses) 
Purchases
Sales
Settlements
Transfer
into
Level 3 (1)
Transfer
out of
Level 3 (1)
Ending balance as of March 31, 2025
Total gains
(losses)
attributable to
assets still held
(Amounts in thousands)
Included
in net
income
Included
in OCI
Included
in net
income
Included
in OCI 
Fixed maturity securities:
U.S. corporate$222,786 $239 $3,167 $— $— $(222)$— $— $225,970 $239 $3,167 
Non-U.S. corporate56,553 (6)232 1,800 — (8,105)— — 50,474 (6)223 
Other asset-backed2,202 9 (36)986 — (1)100 — 3,260 9 (35)
Total$281,541 $242 $3,363 $2,786 $— $(8,328)$100 $— $279,704 $242 $3,355 
______________
(1)The transfers into and out of Level 3 for fixed maturity securities were related to changes in the primary pricing source and changes in the observability of external information used in determining the fair value, such as external ratings or credit spreads.
Purchases, sales, and settlements represent the activity that occurred during the period that results in a change of the asset but does not represent changes in fair value for the instruments held at the beginning of the period.
The amount presented for realized and unrealized gains (losses) included in net income for fixed maturity securities primarily represents amortization and accretion of premiums and discounts on certain fixed maturity securities recorded within net investment income.
The following table presents a summary of the significant unobservable inputs used for certain asset fair value measurements that are based on internal models and classified as Level 3 as of March 31, 2026:
(Amounts in thousands)
Valuation
technique 
Fair value (1)
Unobservable
input 
Range (bps)
Weighted-
average (2) (bps)
Fixed maturity securities:    
U.S. corporateInternal models$189,390 Credit spreads
14 - 206
98
Non-U.S. corporateInternal models$29,812 Credit spreads
91 - 143
106
______________
(1)Certain classes of instruments classified as Level 3 may be excluded as a result of not being material or due to limitations in being able to obtain the underlying inputs used by certain third-party sources, such as broker quotes, used as an input in determining fair value.
(2)Unobservable inputs weighted by the relative fair value of the associated instrument.

We have certain financial instruments that are not recorded at fair value, including cash and cash equivalents and accrued investment income, the carrying value of which approximate fair value due to the short-term nature of these instruments and are not included in this disclosure.
Liabilities not required to be carried at fair value
The following represents our estimated fair value of financial liabilities that are not required to be carried at fair value, classified as Level 2, as of the dates indicated:
March 31, 2026December 31, 2025
(Amounts in thousands)
Carrying
amount
Fair value 
Carrying
amount
Fair value 
Long-term borrowings$744,853 $772,208 $744,481 $785,753