5Suppliers
30Customers
1Debt Items
20Related Chains

Source-Backed Evidence Depth

White Mountains Insurance Group, Ltd. (WTM) is shown with relationship data already present in ChainSifter's database. Counts below come from stored supply-chain records and filing/source URLs where available; missing source URLs are not filled in or estimated.

44Total relationships
5Distinct source URLs
7High confidence
0.685Average confidence
2026-09-13Latest database update
ChainSifter does not infer unreported suppliers, customers, ownership, acquisitions, debt exposure, revenue dependency, or future supply-chain events on this public page.

White Mountains Insurance Group, Ltd. Suppliers

TickerNameConfidenceEvidence
HG-GLOBAL-LTD HG-GLOBAL-LTD 92% On May 15, 2026, White Mountains Insurance Group, Ltd. (NYSE: WTM) (“White Mountains”) announced that HG Global Ltd. (“HGG”), a direct subsidiary of White Mountains, completed a private placement of …
ELEMENTUM ELEMENTUM 90% Elementum manages separate accounts and pooled investment vehicles across various ILS sectors, including catastrophe bonds, collateralized reinsurance investments and industry loss warranties on beha…
WHITE-MOUNTAINS-PARTNERS-LLC WHITE-MOUNTAINS-PARTNERS-LLC 90% White Mountains equity investment was approximately $97 million.
MAX MediaAlpha, Inc. 72% Reciprocal relationship from MAX graph: our initial public offering of our Class A common stock, which closed on October 30, 2020. • “Lifetime value” or “LTV” is a type of metric that many of our bus…
SBS Companhia de Saneamento Básico do Estado de São Paulo - SABESP 62% Reciprocal relationship from SBS graph: Reciprocal relationship from WTM graph: Reciprocal relationship from SBS graph: Reciprocal relationship from WTM graph: Reciprocal relationship from SBS graph:…

White Mountains Insurance Group, Ltd. Customers

TickerNameConfidenceEvidence
ENTERPRISE-SOLUTIONS ENTERPRISE-SOLUTIONS 92% Enterprise Solutions provides specialty electrical contracting services to commercial and institutional customers.
PASSPORTCARD-DAVIDSHIELD PASSPORTCARD-DAVIDSHIELD 85% Through its real-time claims handling process, PassportCard/DavidShield is generally able to control claims, loss costs and fraud upfront, driving lower than industry average loss ratios for their re…
AJG Arthur J. Gallagher & Co. 72% nal and excess of loss basis. Nuclear Nuclear insurance covers country specific nuclear pools and companies and institutions with nuclear exposure excluded from standard property and casualty policie…
AJG Arthur J. Gallagher & Co. 72% Reciprocal relationship from AJG graph: Reciprocal relationship from WTM graph: Reciprocal relationship from AJG graph: Reciprocal relationship from WTM graph: Reciprocal relationship from AJG graph:…
AON Aon plc 72% Reciprocal relationship from AON graph: Reciprocal relationship from WTM graph: nal and excess of loss basis. Nuclear Nuclear insurance covers country specific nuclear pools and companies and institu…
AON Aon plc 72% nal and excess of loss basis. Nuclear Nuclear insurance covers country specific nuclear pools and companies and institutions with nuclear exposure excluded from standard property and casualty policie…
MRSH Marsh & McLennan Companies, Inc. 72% nal and excess of loss basis. Nuclear Nuclear insurance covers country specific nuclear pools and companies and institutions with nuclear exposure excluded from standard property and casualty policie…
MRSH Marsh & McLennan Companies, Inc. 72% Reciprocal relationship from MRSH graph: Reciprocal relationship from WTM graph: Reciprocal relationship from MRSH graph: Reciprocal relationship from WTM graph: Reciprocal relationship from MRSH gra…
XYF X Financial 72% Reciprocal relationship from XYF graph: Reciprocal relationship from WTM graph: ng criteria: (i) the nature of the business activities of each of the Company’s subsidiaries and affiliates; (ii) the m…
XYF X Financial 72% ng criteria: (i) the nature of the business activities of each of the Company’s subsidiaries and affiliates; (ii) the manner in which the Company’s subsidiaries and affiliates are organized; (iii) th…
ALESCO-PREFERRED-FUNDING-XIII-LTD ALESCO-PREFERRED-FUNDING-XIII-LTD 62% surers through the application of concentration limits and thresholds. Ark is selective with its reinsurers, placing reinsurance with only those reinsurers having a strong financial condition. Ark mo…
ALESCO-PREFERRED-FUNDING-XII-LTD ALESCO-PREFERRED-FUNDING-XII-LTD 62% surers through the application of concentration limits and thresholds. Ark is selective with its reinsurers, placing reinsurance with only those reinsurers having a strong financial condition. Ark mo…
ALESCO-PREFERRED-FUNDING-XIV-LTD ALESCO-PREFERRED-FUNDING-XIV-LTD 62% surers through the application of concentration limits and thresholds. Ark is selective with its reinsurers, placing reinsurance with only those reinsurers having a strong financial condition. Ark mo…
A-M-BEST-COMPANY-INC A-M-BEST-COMPANY-INC 62% surers through the application of concentration limits and thresholds. Ark is selective with its reinsurers, placing reinsurance with only those reinsurers having a strong financial condition. Ark mo…
ARK-OUTRIGGER-RE-LTD ARK-OUTRIGGER-RE-LTD 62% tes used in the present value calculations. See Note 4 — “Goodwill and Other Intangible Assets.” The value of the noncontrolling interest is recorded at the acquisition date fair value based on the v…
BAMBOO-GROUP BAMBOO-GROUP 62% ined an indirect equity interest valued at closing at $ 250.0 million (the “Bamboo Sale Transaction”). In the first quarter of 2026, White Mountains received $ 6 million of incremental proceeds, incl…
BAMBOO-HOLDINGS BAMBOO-HOLDINGS 62% globally, including three that have exited the portfolio. As of December 31, 2024, Kudu’s asset and wealth management firms had combined assets under management of approximately $125 billion, spannin…
BRIDGE-HOLDINGS-LTD BRIDGE-HOLDINGS-LTD 62% h (pre-funding) for ILS funds managed by Elementum — 70.0 ( 70.0 ) Net issuance of debt (to) from subsidiaries (8) ( 224.1 ) ( 132.5 ) ( 142.0 ) Net repayment of debt (to) from subsidiaries (6)(8) 20…
BUILD-AMERICA-MUTUAL-ASSURANCE-COMPANY BUILD-AMERICA-MUTUAL-ASSURANCE-COMPANY 62% orism and war and war-like actions can include physical damage, business interruption, liability, loss of life and fire following at locations around the world either in a single city or in coordinat…
DISTINGUISHED-TRANSACTION-WM-PHOENIX-GP-LLC DISTINGUISHED-TRANSACTION-WM-PHOENIX-GP-LLC 62% ined an indirect equity interest valued at closing at $ 250.0 million (the “Bamboo Sale Transaction”). In the first quarter of 2026, White Mountains received $ 6 million of incremental proceeds, incl…
ELEMENTUM-WTM-PARTNERS ELEMENTUM-WTM-PARTNERS 62% ntrol claims, loss costs and fraud upfront, driving lower than industry average loss ratios for their reinsurance partners. Further, the card-based, paperless delivery model enables a superior custom…
GAIL-OUTRIGGER-RE-LTD GAIL-OUTRIGGER-RE-LTD 62% tes used in the present value calculations. See Note 4 — “Goodwill and Other Intangible Assets.” The value of the noncontrolling interest is recorded at the acquisition date fair value based on the v…
HEALTH-UNDERWRITING-LIMITED HEALTH-UNDERWRITING-LIMITED 62% loss of data and third-party liabilities. Terrorism and Political Violence Terrorism and political violence insurance primarily covers physical loss or damage and threat thereof, including ensuing lo…
IDE8-LIMITED IDE8-LIMITED 62% globally, including three that have exited the portfolio. As of December 31, 2024, Kudu’s asset and wealth management firms had combined assets under management of approximately $125 billion, spannin…
IDE8-RE-INC IDE8-RE-INC 62% globally, including three that have exited the portfolio. As of December 31, 2024, Kudu’s asset and wealth management firms had combined assets under management of approximately $125 billion, spannin…
INTERNATIONAL-GROUP INTERNATIONAL-GROUP 62% loss of data and third-party liabilities. Terrorism and Political Violence Terrorism and political violence insurance primarily covers physical loss or damage and threat thereof, including ensuing lo…
INVESTMENT-HOLDINGS INVESTMENT-HOLDINGS 62% tes used in the present value calculations. See Note 4 — “Goodwill and Other Intangible Assets.” The value of the noncontrolling interest is recorded at the acquisition date fair value based on the v…
INVESTOR-SERVICE-INC INVESTOR-SERVICE-INC 62% tes used in the present value calculations. See Note 4 — “Goodwill and Other Intangible Assets.” The value of the noncontrolling interest is recorded at the acquisition date fair value based on the v…
KUDU-INVESTMENT-MANAGEMENT-LLC KUDU-INVESTMENT-MANAGEMENT-LLC 62% 4 366.4 — Other asset-backed securities: Vehicle receivables 1.7 1.7 — 17.2 17.2 — Credit card receivables .2 .2 — 3.3 3.3 — Other 2.0 2.0 — 2.5 2.5 — Total other asset-backed securities 3.9 3.9 — 23…
LLOYDS-BANK-CORPORATE-MARKETS-PLC LLOYDS-BANK-CORPORATE-MARKETS-PLC 62% surers through the application of concentration limits and thresholds. Ark is selective with its reinsurers, placing reinsurance with only those reinsurers having a strong financial condition. Ark mo…

White Mountains Insurance Group, Ltd. Debt Obligations

InstrumentDescriptionConfidenceEvidence
WTM-DEBT Debt stack $932.5M 90% Market cache reports total debt of $932.5M.

White Mountains Insurance Group, Ltd. Acquisitions

No acquisitions on recordNo completed or pending acquisitions found in our database for White Mountains Insurance Group, Ltd..

White Mountains Insurance Group, Ltd. Ownership

HolderNameConfidenceEvidence
WTM-OWNER-MORGAN-STANLEY MORGAN STANLEY 90% 13F overlay lists MORGAN STANLEY as top holder; 369 tracked holders.

White Mountains Insurance Group, Ltd. Extended Supply Chain Network

TickerNameChain IndexHopsRelationship Types
RYAN Ryan Specialty Holdings, Inc. 100.00 2
AHG Akso Health Group 100.00 2
FIHL Pelagos Insurance Capital Limited 100.00 2
CIB Grupo Cibest S.A. 100.00 2
ETOR eToro Group Ltd. 100.00 2
FCCN Spectral Capital Corporation 100.00 2
BLNE Beeline Holdings, Inc. 100.00 2
CSTE Caesarstone Ltd. 100.00 2
BTDR Bitdeer Technologies Group 100.00 2
TIRX Tian Ruixiang Holdings Ltd. 100.00 2
AXS AXIS Capital Holdings Limited 100.00 2
BRBI BRBI BR Partners S.A. 100.00 2
BLSH Bullish 100.00 2
GEMI Gemini Space Station, Inc. 100.00 2
CANG Cango Inc. 100.00 2
ENLT Enlight Renewable Energy Ltd 100.00 2
AMBR Amber International Holding Limited 100.00 2
BGC BGC Group, Inc. 100.00 2
FENG Phoenix New Media Limited 100.00 2
CRMZ CreditRiskMonitor.com, Inc. 100.00 2
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WTM
Unlock WTM Supply Chain Data
Verified relationships include:
HG-GLOBAL-LTDHG-GLOBAL-LTDSupplier92%
ELEMENTUMELEMENTUMSupplier90%
ENTERPRISE-SOLUTIONSENTERPRISE-SOLUTIONSCustomer92%
PASSPORTCARD-DAVIDSHIELDPASSPORTCARD-DAVIDSHIELDCustomer85%
+33 more relationships locked
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