Alleghany Corporation

aid: alleghany
name: Alleghany Corporation
description: Alleghany Corporation is a holding company engaged in property and casualty reinsurance and insurance through
  its subsidiaries, with additional investments in non-financial businesses held via Alleghany Capital. Founded in 1929 by
  railroad entrepreneurs Oris and Mantis Van Sweringen, the company transitioned over decades from rail holdings into specialty
  insurance and reinsurance, and is headquartered at One Rockefeller Plaza in New York City. Its principal insurance subsidiaries
  are Transatlantic Reinsurance Company (TransRe), a global reinsurer founded in 1977 with roughly 600 employees across 23
  offices and more than $40 billion in claims paid to date; RSUI Group, a wholesale excess and surplus (E&S) underwriter spanning
  Property, Casualty, Professional Liability, Management Liability, and Binding Authority lines; and CapSpecialty, a specialty
  casualty and surety underwriter. Alleghany Capital holds non-insurance operating companies including toy and collectibles
  maker Jazwares (Squishmallows, Pokémon, Roblox, Fortnite licensed lines). On March 21, 2022, Berkshire Hathaway announced
  an $11.6 billion all-cash acquisition of Alleghany at $848.02 per share, which closed in October 2022. Alleghany now operates
  as a wholly-owned subsidiary of Berkshire Hathaway, contributing approximately $8.8 billion in 2025 gross premiums written
  and roughly $14 billion in insurance float to the parent. As a holding company whose operating units distribute exclusively
  through reinsurance intermediaries, wholesale brokers, and independent agents, Alleghany and its subsidiaries do not publish
  a developer portal, OpenAPI specifications, SDKs, or any other machine-readable API artifacts; the only digital surfaces
  exposed publicly are gated broker and agent login portals.
type: Index
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/alleghany.png
url: https://raw.githubusercontent.com/api-evangelist/alleghany/refs/heads/main/apis.yml
tags:
- Insurance
- Reinsurance
- Property And Casualty
- Specialty Insurance
- Excess And Surplus
- Surety
- Financial Services
- Holding Company
- Berkshire Hathaway Subsidiary
- Toys And Collectibles
- Fortune 500
created: '2026-04-19'
modified: '2026-05-23'
specificationVersion: '0.19'
apis: []
common:
- type: DomainSecurity
  url: security/alleghany-domain-security.yml
- type: Website
  url: https://www.alleghany.com
- type: ContactUs
  url: https://www.alleghany.com/contact-us/
- type: ParentCompany
  url: https://www.berkshirehathaway.com
- type: Subsidiary
  name: TransRe (Transatlantic Reinsurance Company)
  url: https://www.transre.com
- type: Subsidiary
  name: RSUI Group
  url: https://www.rsui.com
- type: Subsidiary
  name: CapSpecialty
  url: https://www.capspecialty.com
- type: Subsidiary
  name: Jazwares
  url: https://www.jazwares.com
- type: AgentLogin
  name: RSUI Broker Portal
  url: https://www.rsui.com/brokers/
- type: PressRelease
  name: Berkshire Hathaway Acquires Alleghany (Mar 21, 2022)
  url: https://www.berkshirehathaway.com/news/MAR2122.pdf
- type: GitHubOrganization
  name: TransRe (empty - 0 public repos)
  url: https://github.com/TransRe
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com