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Compare · ACGL vs WTM

ACGL vs WTM

Side-by-side comparison of Arch Capital Group Ltd. (ACGL) and White Mountains Insurance Group Ltd. (WTM): market cap, price performance, sector, and recent activity on the wire.

Summary

  • Both ACGL and WTM operate in Property-Casualty Insurers (Finance), so they compete in similar markets.
  • ACGL is the larger of the two at $31.86B, about 6.2x WTM ($5.11B).
  • Over the past year, ACGL is down 1.2% and WTM is up 15.5% - WTM leads by 16.7 points.
  • WTM has been more active in the news (13 items in the past 4 weeks vs 11 for ACGL).
  • ACGL has more recent analyst coverage (25 ratings vs 0 for WTM).
PerformanceACGL-1.25%WTM+15.47%
2025-06-09+0.00%2026-06-05
MetricACGLWTM
Company
Arch Capital Group Ltd.
White Mountains Insurance Group Ltd.
Price
$91.19+3.21%
$2066.96+2.70%
Market cap
$31.86B
$5.11B
1M return
-3.72%
-0.25%
1Y return
-1.25%
+15.47%
Industry
Property-Casualty Insurers
Property-Casualty Insurers
Exchange
NASDAQ
NYSE
IPO
News (4w)
11
13
Recent ratings
25
0
ACGL

Arch Capital Group Ltd.

Arch Capital Group Ltd., together with its subsidiaries, provides insurance, reinsurance, and mortgage insurance products worldwide. The company's Insurance segment offers primary and excess casualty coverages; loss sensitive primary casualty insurance programs; collateral protection, debt cancellation, and service contract reimbursement products; directors' and officers' liability, errors and omissions liability, employment practices and fiduciary liability, crime, professional indemnity, and other financial related coverages; medical professional and general liability insurance coverages; and workers' compensation and umbrella liability, as well as commercial automobile, and inland marine products. It also provides property, energy, marine, and aviation insurance; travel insurance; accident, disability, and medical plan insurance coverages; captive insurance programs; employer's liability; and contract and commercial surety coverages. This segment markets its products through a group of licensed independent retail and wholesale brokers. Its Reinsurance segment provides reinsurance for third party liability and workers' compensation exposures; marine and aviation reinsurance; surety, accident and health, workers' compensation catastrophe, agriculture, trade credit, and political risk products; reinsurance protection for catastrophic losses, and personal lines and commercial property exposures; life reinsurance; casualty clash; and risk management solutions. This segment markets its reinsurance products through brokers. The company's Mortgage segment offers direct mortgage insurance and mortgage reinsurance. The company was founded in 1995 and is based in Pembroke, Bermuda.

WTM

White Mountains Insurance Group Ltd.

White Mountains Insurance Group, Ltd., through its subsidiaries, provides insurance services in the United States. The company operates through HG Global/BAM, Ark, NSM, Kudu, and Other Operations segments. The HG Global/BAM segment provides insurance on municipal bonds issued to finance public purposes, such as schools, utilities, and transportation facilities, as well as reinsurance protection services. The Ark segment writes a portfolio of reinsurance and insurance, including property, accident and health, energy, marine, and political risks. The NSM segment operates as a general underwriting agency and program administrator for specialty property and casualty insurance to various sectors, such as specialty transportation, real estate, social services, and pet. The Kudu segment provides capital solutions to boutique asset and wealth managers for generational ownership transfers, management buyouts, acquisitions, growth finances, and legacy partner liquidity. The Other Operations segment offers insurance solutions to travel industry through broker channel; and manages separate accounts and pooled investment vehicles for insurance-linked securities sectors, including catastrophe bonds, collateralized reinsurance investments, and industry loss warranties of third-party clients. White Mountains Insurance Group, Ltd. was incorporated in 1980 and is headquartered in Hamilton, Bermuda.

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