Stock ownership · SEC 13F · Q4 2025

WHITE MTNS INS GROUP LTD

Who owns WHITE MTNS INS GROUP LTD (CUSIP G9618E107)? A look at the institutions behind it, how tightly they hold it, and the latest quarter's moves.

$125K
Reported value
3
Institutions
100%
Top-5 share

The verdict

As of Q4 2025, 3 institutions report $125K in WHITE MTNS INS GROUP LTD positions, ownership that is dominated by its top few institutional owners.

3
institutions hold it
$125K
reported 13F value
100%
held by top 5

Based on long positions reported to the SEC as of Q4 2025; 13F omits shorts, options and non-US holdings.

How 13F ownership is computed · All tracked stocks · Concentration rankings

SEC Form 13F-HR ownership desk

CUSIP G9618E107 · Q4 2025 $0M reported

VALUE-TRACE · HOLDERS-FOCUS · CONC-DOM · PHOTO-UNK · ACTIVITY-LIGHT · BOOK-MID

  • VALUE-TRACE $0.1M
  • HOLDERS-FOCUS 3 filers
  • CONC-DOM 100% top-5
  • PHOTO-UNK No peer
  • ACTIVITY-LIGHT 1 new
  • BOOK-MID 7Q history

Read with: Ownership concentration guide - WHITE MTNS INS GROUP LTD's top-five holders account for 100% of reported value — read concentration before treating any single filer as a signal.

Largest institutional holders of WHITE MTNS INS GROUP LTD
  1. 1
    Anchor Investment Management, LLC $104K
  2. 2
    Bell Investment Advisors, Inc $17K
  3. 3
    TD Capital Management LLC $4K

Top 3 reported holders by value · Q4 2025

Institutional ownership over time

The number of institutions reporting a WHITE MTNS INS GROUP LTD position has risen from 2 to 3 over the last 7 quarters of 13F filings.

0123456 Q1'24Q3'24Q4'24Q1'25Q2'25Q3'25Q4'25 3
Distinct 13F filers holding WHITE MTNS INS GROUP LTD, by quarter

Top Institutional Holders

# Institution Shares Value Share of reported
1 Anchor Investment Management, LLC 50 $104K 83.3%
2 Bell Investment Advisors, Inc 8 $17K 13.3%
3 TD Capital Management LLC 2 $4K 3.3%

Investment Discretion

SEC Form 13F requires each institutional filer to report whether it exercises sole or shared discretion over a position. Among WHITE MTNS INS GROUP LTD's reported holders for Q4 2025, by reported value:

Sole discretion (SOLE)
100.0%

Latest Quarter Activity · Q4 2025

New positions (1)

Anchor Investment Management, LLC $104K

Complete exits (3)

CIBC Private Wealth Group LLC exited
SPEECE THORSON CAPITAL GROUP INC exited
JPMORGAN CHASE & CO (JPM, AMJB, VYLD, JPM-PC, JPM-PD, JPM-PJ, JPM-PK, JPM-PL, JPM-PM) exited

Frequently Asked Questions

How many institutions hold WHITE MTNS INS GROUP LTD?▼
WHITE MTNS INS GROUP LTD is held by 3 institutional investors per the latest SEC Form 13F filings as of Q4 2025.
What is the total institutional value of WHITE MTNS INS GROUP LTD?▼
Institutions report $125K of WHITE MTNS INS GROUP LTD as of Q4 2025.
How concentrated is ownership of WHITE MTNS INS GROUP LTD?▼
The top five institutional holders account for 100% of the reported institutional value in WHITE MTNS INS GROUP LTD, making ownership dominated by its top few institutional owners.
Who is the largest institutional holder of WHITE MTNS INS GROUP LTD?▼
Anchor Investment Management, LLC is the largest reported holder of WHITE MTNS INS GROUP LTD with $104K across 50 shares as of Q4 2025.

Source: U.S. Securities and Exchange Commission (SEC) - EDGAR Form 13F-HR institutional holdings filings · Q4 2025 13F-HR discloses long US-listed equity positions of managers with $100M+ qualifying assets, filed within 45 days of period end. Short positions and most derivatives are not disclosed.

PlainFundData is rendered directly from SEC EDGAR Form 13F-HR institutional holdings filings, no number is typed in by an editor. Holder lists, concentration, and reported value on this page are aggregated live from those 13F-HR extracts. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-05-16.