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White Mountains Insurance Group Ltd (WTM) — chart, structure and Closelook read

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Company snapshot — White Mountains Insurance Group Ltd

WTM in five paragraphs: what it makes and sells, where it sits in the Closelook stack, who it is priced against, why we track it, what we watch. Research diary, not advice.

What it does
White Mountains Insurance Group is a holding company that owns a set of insurance and reinsurance businesses rather than writing all the risk itself. Its units cover property cover, specialty lines such as aviation, cyber and marine risk, casualty lines, and accident and health cover, sold through brokers and managing general agents. A separate unit reinsures municipal bond guarantees, another runs an asset-management stake called Kudu, and a smaller arm does specialty electrical contracting. It is based in Hamilton, Bermuda, and trades in the United States.
Where it sits in the stack
White Mountains carries no seat in Rubin, our AI infrastructure index. It sits in the insurance sleeve of our wider coverage, grouped by industry rather than by AI layer, as a company whose underwriting and asset-management businesses do not sit inside the AI build-out stack.
Who it is priced against
Closelook has not assigned a peer group to White Mountains. The market sometimes compares it with Markel, another insurance holding company built through niche underwriting and permanent capital.
Why Closelook tracks it
It holds a seat in the Russell 1000 but not in Rubin or Halo, our other indices, and carries no Closelook score yet. It has not appeared in the diary's editions or quotes so far.
What the diary watches
The diary watches how the mix between the underwriting segments and the newer asset-management and specialty-service units, such as Kudu, shifts the group's overall returns over time.

White Mountains Insurance Group Ltd (WTM) trades on US exchanges.

Written from the company’s public profile and Closelook’s own readings, 2026-09-17. Descriptive, refreshed with the registry; corrections welcome via the imprint. closelook.net is an investment research diary — market structure, index membership and scores are our own readings, not investment advice. Related: index compare · sector dispersion · scanner.

Signals for this name

Every Closelook reading that exists for WTM, from the same nightly bakes the boards use. Research diary readings, not advice.

Who it is priced against Insurance - Property & Casualty · United States · 8 names with week and year-to-date

Peer group

Insurance - Property & Casualty · United States

This name carries no Closelook score, so its cohort ranks on trend state — distance to the 50- and 200-day averages — never on a score it does not have.

Compared against WTM on the nightly bakes; the Peers tab ranks the cohort on the Closelook scores where it exists.

Weather around the name 3 macro readings: Money Temperature, Factor regime, Sovereign pressure

The weather around this name

Macro readings that apply by membership — the regime, the factor tape, the sector cell, the funding backdrop.

  • Money Temperature Composite 55/100 · S&P 500 fund at 58, above its 50- and 200-day averagesEight instruments scored on position, momentum, volume, volatility and fragility — the regime every name trades inside. Temperature lab → 2026-09-17
  • Factor regime Momentum leading — risk appetite buildingMomentum against low volatility (SPMO / SPLV): above its 50-day trend, 94th percentile of the window, +2.7% over 20 sessions. Factor regime → 2026-09-17
  • Sovereign pressure Index 0.00 · down 0.41 over 21 sessionsG7 long-end yields, 10s30s and the slope — the funding weather for every balance sheet on this site. Sovereign pressure → 2026-09-17

FAQ · from the current data · as of 2026-09-18

Quick answers

What is White Mountains Insurance Group Ltd (WTM)?

White Mountains Insurance Group Ltd trades as WTM on the US exchange (United States) in the Closelook research universe, as of the registry build of 2026-09-18.

Is WTM in a Closelook index?

Not currently — White Mountains Insurance Group Ltd is tracked in the Closelook research universe but is not a constituent of a Closelook functional index as of 2026-09-18.

Where does WTM trade against its moving averages?

Mixed moving-average stack: Trades -3.4% vs the 50-day and -3.3% vs the 200-day average, 11.8% below the 52-week high and +25% off the 52-week low. Computed from daily closes. As of 2026-09-17 — a technical state from the nightly Closelook bake, not advice. The Technical tab carries the full row.

What does White Mountains Insurance Group Ltd do?

White Mountains Insurance Group is a holding company that owns a set of insurance and reinsurance businesses rather than writing all the risk itself. Its units cover property cover, specialty lines such as aviation, cyber and marine risk, casualty lines, and accident and health cover, sold through brokers and managing general agents. A separate unit reinsures municipal bond guarantees, another runs an asset-management stake called Kudu, and a smaller arm does specialty electrical contracting. Closelook has not assigned a peer group to White Mountains. The market sometimes compares it with Markel, another insurance holding company built through niche underwriting and permanent capital.

Where does White Mountains Insurance Group Ltd sit in the AI build-out?

White Mountains carries no seat in Rubin, our AI infrastructure index. It sits in the insurance sleeve of our wider coverage, grouped by industry rather than by AI layer, as a company whose underwriting and asset-management businesses do not sit inside the AI build-out stack. It holds a seat in the Russell 1000 but not in Rubin or Halo, our other indices, and carries no Closelook score yet. It has not appeared in the diary's editions or quotes so far.

What does this page show?

A live price chart with SMA overlays and drawing tools for WTM, performance metrics, index-membership context and the Closelook structure read — an investment research diary view, not investment advice.

Related in the Closelook universe

then Insurance - Property & Casualty, then Financial Services. Scored names rank on their Closelook score; names without one rank on trend state — above or below their 50- and 200-day averages — never on a score they do not carry.