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WTM

White Mountains Insurance Group, Ltd. Common Stock (WTM)

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WTM in the last 90 days

White Mountains Insurance Group, Ltd. Common Stock (WTM) (WTM) had no congress transactions and no insider purchases in filings from the last 90 days.

FINRA’s latest report (settlement 15 SEPT 2026) shows 135,407 shares held short, 6.2 days to cover, up 2.8% from the report before.

  • Delay: each filing below shows how many days passed between the trade and its publication. None of this is real-time.

Latest filing on file: 24 JUL 2025 · FINRA settlement 15 SEPT 2026 · public filings, reported as filed

What the filings show

What the filings show · last 90 days

1 of 4 sources

+5Balanced

Leaning outBalancedLeaning in

The disclosed money is split, on what has actually been filed. This reads on one source only, so treat it lightly.

Short interest
Short interest fell 2.1% — 138,306 to 135,407 shares between 15 JUL 2026 and 15 SEPT 2026. See the filings →
+5

This summarises filings that have already been published — it is not a forecast, a rating of the company, or advice. Every figure above is listed in full further down this page, with the document it came from.

FINRA short interest

Settlement 15 SEPT 2026 · shares held short

135,407shares held short

Days to cover

6.17

Avg daily volume

21,956

Since last report

+2.83%

As of 15 September 2026, 135,407 White Mountains Insurance Group, Ltd. Common Stock (WTM) shares were held short — the total across every reporting firm, not one fund's position. That is 3,722 shares more than the previous report, a 2.83% increase. At the average daily volume of 21,956 shares, that position represents 6.17 days of trading — what the filing calls days to cover.

This is the most recent figure that exists, and it is 17 days old. FINRA collects short interest twice a month, on a settlement date, and publishes it about eight business days later. So nobody has a live short-interest number for WTM — not us, and not anyone quoting one. We print the settlement date on the figure so you always know which day you are looking at.

Across the 12 reports we hold, the position has risen from 82,241 shares on 31 March 2026 to 135,407 today, a change of 64.6%. The highest reading in that window was 138,306 shares on 15 July 2026.

SettlementShares shortDays to cover
15 SEPT 2026135,4076.17
31 AUG 2026131,6856.47
14 AUG 2026136,3165.67
31 JUL 2026136,9798.53
15 JUL 2026138,3067.38
30 JUN 2026124,7616.87
15 JUN 2026119,2404.52
29 MAY 202690,9604.13
15 MAY 202687,9553.69
30 APR 202678,0135.92
15 APR 202671,6863.84
31 MAR 202682,2414.59
What is WTM's short interest?
135,407 shares, as of the 15 September 2026 settlement date. That is the figure FINRA published, unadjusted.
What percentage of the float is short?
We do not publish that, because FINRA does not publish float. The regulator reports the number of shares held short; turning it into a percentage needs a share count from somewhere else, and different sources disagree about what counts as float. We would rather give you the number that was actually filed than a percentage built on an assumption.
How current is this?
It is 17 days old, and that is as fresh as short interest gets. FINRA measures it twice a month and publishes it seven business days after the settlement date. Any site showing you a "live" short interest figure is showing you something else.
What does days to cover mean?
It is the short position divided by average daily trading volume — here, 6.17. It describes how many days of ordinary trading the position is equivalent to. It is arithmetic from the filing, not a prediction about what will happen.
Where does this come from?
FINRA's consolidated short interest file, which is public. We read it directly and store it unchanged, except that we blank the days-to-cover placeholder FINRA writes when a stock has almost no volume.

Disclosed insider buying on file

—no purchase on file passed the price check

Open-market purchases only — the amount is a fact, not a verdict.

On file here

Short positions0

Insider purchases0

Congress transactions1

Latest change24 JUL 2025

SHORT POSITIONS · 0INSIDER BUYS · 0CONGRESS · 1

Congress transactions on file

1 disclosed · newest first · every row links to its filing

WhoAmount as filedTradedFiledLag
Hon. James French HillBOUGHT$50,001 – $100,00023 JUN 202524 JUL 202531 days
What this page will never showNo price targetsNo score out of 100No buy or sell callsNo predictionsDocuments, dates, and how late they were.