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SEC EDGAR 8-K$WTM

WHITE MOUNTAINS REPORTS THIRD QUARTER RESULTS

WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) filed an SEC Form 8-K — Results of Operations and Financial Condition. Exhibit 99.1 CONTACT: Rob Seelig (603) 640-2212 WHITE MOUNTAINS REPORTS THIRD QUARTER RESULTS HAMILTON, Bermuda (November 5, 2026) - White Mountains Insurance Group, Ltd. (NYSE: WTM) reported book value per share of $2,243 as of September 30, 2026, a decrease of 1% for the third

Original reporting
SEC EDGAR 8-K
Published Nov 5, 2026, 1:13 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Nov 5, 2026, 1:16 PM UTC. Informational, not investment advice.
How this was made
AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
About AlphAI AI DeskScoring methodologyReport an issue
AlphAI market briefEarnings
Primary signal
$WTM
Bearish
medium confidence
Mentioned
$WTM
Relevance
7/10
AlphAI data visualization · based on SEC EDGAR 8-K
Decision brief

The 30-second read

$WTMBearishHigh
01

Why it matters

The earnings miss and investment losses are likely to weigh on the share price in the near term.

02

Market read

First‑report earnings data for a mid‑cap insurer; material for traders monitoring insurance sector performance.

03

What to watch

Growth in specialty and accident & health lines may offset investment losses over the longer term.

Relevance 7/10Novelty 8/10Timing: today

Background

The filing is an SEC Form 8‑K Item 2.02, the first public disclosure of White Mountains' Q3 2026 financials.

Company-level read

Ticker impact

$WTMBearishMedium confidence
Context

White Mountains Insurance Group reported Q3 2026 results, showing a 1% decline in book value per share and a $39M comprehensive loss, driven by higher interest rates and a $54M mark‑to‑market loss on its MediaAlpha investment.

Expected impact

likely downside as investors price in lower book value and unrealized losses.

Evidence & confidence

The disclosed loss and book‑value decline are material for a listed insurer; no offsetting positive guidance was provided.

Market effects

Sector

Insurance sector may see broader scrutiny of investment portfolios amid rising rates.

Regional

U.S. insurers could face margin pressure, potentially affecting regional indices.

Global

Limited to insurers with similar investment exposures; no immediate global macro effect.

Counterpoint

What could challenge this read

If the investment portfolio stabilizes, the stock could rebound on its strong underwriting performance.

Key entities

  • company
    White Mountains Insurance Group Ltd.

    NYSE‑listed insurer reporting Q3 2026 results.

  • investment
    MediaAlpha

    Investment whose share price decline caused a $54M mark‑to‑market loss.

Read at source← All news

StoryWhite Mountains reports 1% drop in Q3 2026 book value per share

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