White Mountains Insurance Group, Ltd.
US ˙ NYSE ˙ BMG9618E1075

SecurityWTM / White Mountains Insurance Group, Ltd.
InstitutionFranklin Resources Inc
Latest Disclosed Ownership4,798 shares
Latest Disclosed Value $ 10,541,014
Franklin Resources Inc reports 1,099.50% increase in ownership of WTM / White Mountains Insurance Group, Ltd.

On May 13, 2026 - Franklin Resources Inc filed a 13F-HR form disclosing ownership of 4,798 shares of White Mountains Insurance Group, Ltd. (US:WTM) valued at $10,541,014 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 400 shares of White Mountains Insurance Group, Ltd.. This represents a change in shares of 1,099.50% during the quarter. The current value of the position is $9,759,228 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F WHITE MTNS INS GROUP COM G9618E107 4,798 4,398 1,099.50 10,541 1,168.47 0.0004
2026-02-11 2025-12-31 13F WHITE MTNS INS GROUP COM G9618E107 400 4 1.01 831 25.72 0.0002
2025-11-13 2025-09-30 13F WHITE MTNS INS GROUP COM G9618E107 396 -38 -8.76 662 -15.15 0.0002
2025-08-12 2025-06-30 13F WHITE MTNS INS GROUP COM G9618E107 434 -31 -6.67 779 -12.96 0.0002
2025-05-13 2025-03-31 13F WHITE MTNS INS GROUP COM G9618E107 465 44 10.45 896 9.41 0.0003
2025-02-12 2024-12-31 13F WHITE MTNS INS GROUP COM G9618E107 421 67 18.93 819 25.08 0.0002
2024-11-27 2024-09-30 13F/A-1 WHITE MTNS INS GROUP COM G9618E107 354 53 17.61 654 19.56 0.0002
2024-11-12 2024-09-30 13F WHITE MTNS INS GROUP COM G9618E107 354 53 654 0.0000
2024-08-14 2024-06-30 13F WHITE MTNS INS GROUP COM G9618E107 301 110 57.59 547 59.94 0.0002
2024-05-13 2024-03-31 13F WHITE MTNS INS GROUP COM G9618E107 191 191 343 0.0001
2024-02-09 2023-12-31 13F WHITE MTNS INS GROUP COM G9618E107 0 -1,886 -100.00 0 -100.00
2023-11-13 2023-09-30 13F WHITE MTNS INS GROUP COM G9618E107 1,886 -2,257 -54.48 2,821 -50.99 0.0014
2023-08-11 2023-06-30 13F WHITE MTNS INS GROUP COM G9618E107 4,143 4,143 5,754 0.0027
2022-02-11 2021-12-31 13F WHITE MTNS INS GROUP COM G9618E107 0 -2,270 -100.00 0 -100.00
2021-11-12 2021-09-30 13F WHITE MTNS INS GROUP COM G9618E107 2,270 2,270 2,427 0.0009
2019-08-14 2019-06-30 13F WHITE MTNS INS GROUP COM G9618E107 0 -250 -100.00 0 -100.00
2019-05-15 2019-03-31 13F/A-1 WHITE MTNS INS GROUP COM G9618E107 250 0 0.00 231 7.94 0.0001
2019-05-14 2019-03-31 13F WHITE MTNS INS GROUP COM G9618E107 250 0 231
2019-02-12 2018-12-31 13F WHITE MTNS INS GROUP COM G9618E107 250 0 0.00 214 -8.55 0.0001
2018-11-13 2018-09-30 13F WHITE MTNS INS GROUP COM G9618E107 250 0 0.00 234 3.08 0.0001
2018-08-14 2018-06-30 13F WHITE MTNS INS GROUP COM G9618E107 250 0 0.00 227 10.19 0.0001
2018-05-10 2018-03-31 13F WHITE MTNS INS GROUP COM G9618E107 250 -10 -3.85 206 -6.79 0.0001
2018-02-14 2017-12-31 13F WHITE MTNS INS GROUP COM G9618E107 260 -79,381 -99.67 221 -99.68 0.0001
2017-11-13 2017-09-30 13F WHITE MTNS INS GROUP COM G9618E107 79,641 -630,504 -88.79 68,252 -88.94 0.0335
2017-08-10 2017-06-30 13F WHITE MTNS INS GROUP COM G9618E107 710,145 -75 -0.01 616,853 -1.29 0.3076
2017-05-12 2017-03-31 13F WHITE MTNS INS GROUP COM G9618E107 710,220 -10,450 -1.45 624,908 3.72 0.3172
2017-02-14 2016-12-31 13F WHITE MTNS INS GROUP COM G9618E107 720,670 -8,157 -1.12 602,516 -0.40 0.3119
2016-11-14 2016-09-30 13F WHITE MTNS INS GROUP COM G9618E107 728,827 -305,007 -29.50 604,925 -30.51 0.3163
2016-08-11 2016-06-30 13F WHITE MTNS INS GROUP COM G9618E107 1,033,834 -335,505 -24.50 870,491 -20.79 0.4683
2016-05-10 2016-03-31 13F WHITE MTNS INS GROUP COM G9618E107 1,369,339 -2,064 -0.15 1,099,033 10.26 0.5834
2016-04-27 2015-12-31 13F/A-1 WHITE MTNS INS GROUP COM G9618E107 1,371,403 -2,701 -0.20 996,752 -2.93 0.5046
2016-02-12 2015-12-31 13F WHITE MTNS INS GROUP COM G9618E107 1,371,403 996,752
2015-11-10 2015-09-30 13F WHITE MTNS INS GROUP COM G9618E107 1,374,104 -29,954 -2.13 1,026,871 11.67 0.5072
2015-08-12 2015-06-30 13F WHITE MTNS INS GROUP COM G9618E107 1,404,058 -20,096 -1.41 919,574 -5.67 0.4174
2015-05-14 2015-03-31 13F WHITE MTNS INS GROUP COM G9618E107 1,424,154 -3,486 -0.24 974,860 8.37 0.4420
2015-02-10 2014-12-31 13F WHITE MTNS INS GROUP COM G9618E107 1,427,640 0 0.00 899,571 0.01 0.4080
2014-11-12 2014-09-30 13F WHITE MTNS INS GROUP COM G9618E107 1,427,640 -9,814 -0.68 899,512 2.85 0.4103
2014-08-12 2014-06-30 13F WHITE MTNS INS GROUP COM G9618E107 1,437,454 -210 -0.01 874,602 1.41 0.3853
2014-05-13 2014-03-31 13F WHITE MTNS INS GROUP COM G9618E107 1,437,664 0 0.00 862,454 -0.53 0.4073
2014-02-12 2013-12-31 13F WHITE MTNS INS GROUP COM G9618E107 1,437,664 -574 -0.04 867,025 6.20 0.4238
2013-11-14 2013-09-30 13F WHITE MTNS INS GROUP COM G9618E107 1,438,238 -816 -0.06 816,371 -1.33 0.4345
2013-08-09 2013-06-30 13F WHITE MTNS INS GROUP COM G9618E107 1,439,054 1,439,054 827,371 0.4723
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.