White Mountains Insurance Group Ltd (WTM)

White Mountains Insurance Group Ltd experienced notable insider activity in December 2025. Chief Executive Officer George Manning Rountree sold 5,000 shares, while Philip A. Gelston disposed of 165 units. These transactions represent the most recent recorded movements, occurring over a year ago, indicating no significant trading patterns within the last three months.
Ticker: WTM Exchange: NYS


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Purchase Sale Planned purchase Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for White Mountains Insurance Group Ltd. Upgrade to see score, net flow, insiders and the full signal context.

Top insiders
Trades
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
1.4
Rountree George Manning Chief Executive Officer Executive Director
Transaction date
Sale
Price
295.86
Quantity 64,663 -13.9%
Value US$1,163,454
0.9
Gelston Philip A Non-Executive Director
Transaction date
Sale
Price
15.30
Quantity 90,373 +20.0%
Value US$3,864,972
2.4
Hicks Weston M Non-Executive Director
Transaction date
Purchase
Price
209.24
Quantity 84,147 -27.6%
Value US$608,608
2.4
Hicks Weston M Non-Executive Director
Transaction date
Purchase
Price
1,483.43
Quantity 11 +0.5%
Value US$16,318
2.4
Hicks Weston M Non-Executive Director
Transaction date
Purchase
Price
1,479.88
Quantity 579 +39.2%
Value US$856,851
2.4
Hicks Weston M Non-Executive Director
Transaction date
Purchase
Price
1,476.74
Quantity 120 +8.8%
Value US$177,209
2.4
Hicks Weston M Non-Executive Director
Transaction date
Purchase
Price
1,476.15
Quantity 52 +4.0%
Value US$76,760
1.9
Hildreth Michaela MD & Chief Accounting Officer Officer
Transaction date
Sale
Price
1,371.84
Quantity 100 -6.4%
Value US$137,184
2.8
Carlson Peter M Non-Executive Director
Transaction date
Sale
Price
1,400.00
Quantity 200 -20.2%
Value US$280,000
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
1,400.00
Quantity 945 -12.0%
Value US$1,323,000
1.9
Hildreth Michaela MD & Chief Accounting Officer Officer
Transaction date
Sale
Price
1,270.94
Quantity 100 -6.0%
Value US$127,094
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
1,117.00
Quantity 337 -32.0%
Value US$376,429
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
1,138.00
Quantity 1,163 -52.5%
Value US$1,323,494
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Purchase
Price
785.00
Quantity 50 +0.7%
Value US$39,250
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Purchase
Price
782.60
Quantity 610 +8.7%
Value US$477,386
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Purchase
Price
715.00
Quantity 390 +5.9%
Value US$278,850
SMITH LOWNDES ANDREW Non-Executive Director
Transaction date
Sale
Price
1,105.76
Quantity 200 -15.4%
Value US$221,152
SMITH LOWNDES ANDREW Non-Executive Director
Transaction date
Sale
Price
1,085.51
Quantity 721 -35.6%
Value US$782,653
SMITH LOWNDES ANDREW Non-Executive Director
Transaction date
Sale
Price
1,088.01
Quantity 279 -12.1%
Value US$303,555
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel
Transaction date
Sale
Price
1,052.31
Quantity 10 -0.1%
Value US$10,523
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel
Transaction date
Sale
Price
1,049.00
Quantity 103 -0.9%
Value US$108,047
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel
Transaction date
Sale
Price
1,048.14
Quantity 70 -0.6%
Value US$73,370
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel
Transaction date
Sale
Price
1,046.93
Quantity 657 -5.3%
Value US$687,833
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel
Transaction date
Sale
Price
1,039.50
Quantity 160 -1.3%
Value US$166,320
1.0
PALMER JESS BRIAN Chief Accounting Officer
Transaction date
Sale
Price
1,016.57
Quantity 431 -26.6%
Value US$438,142
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
975.00
Quantity 60 -0.5%
Value US$58,500
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
977.34
Quantity 860 -6.4%
Value US$840,512
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
979.62
Quantity 80 -0.6%
Value US$78,370
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
985.20
Quantity 83 -0.6%
Value US$81,772
Transaction date
Sale
Price
928.40
Quantity 554 -15.6%
Value US$514,334
Transaction date
Planned sale
Price
910.11
Quantity 696 -16.4%
Value US$633,437
Transaction date
Planned sale
Price
912.90
Quantity 354 -7.7%
Value US$323,167
Transaction date
Sale
Price
916.95
Quantity 585 -11.3%
Value US$536,416
Transaction date
Planned sale
Price
914.99
Quantity 412 -7.4%
Value US$376,976
Transaction date
Planned sale
Price
923.65
Quantity 910 -14.0%
Value US$840,522
Transaction date
Sale
Price
925.00
Quantity 362 -5.3%
Value US$334,850
Transaction date
Planned sale
Price
924.15
Quantity 852 -11.0%
Value US$787,376
Transaction date
Planned sale
Price
922.66
Quantity 601 -7.2%
Value US$554,519
2.9
Tanner David Allen Non-Executive Director
Transaction date
Purchase
Price
918.46
Quantity 495 +256.5%
Value US$454,638
2.9
Tanner David Allen Non-Executive Director
Transaction date
Purchase
Price
917.05
Quantity 5 +2.7%
Value US$4,585
Transaction date
Sale
Price
916.70
Quantity 400 -13.6%
Value US$366,680
Transaction date
Planned sale
Price
914.00
Quantity 709 -7.8%
Value US$648,026
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Planned sale
Price
925.21
Quantity 954 -9.6%
Value US$882,650
2.7
DAVIS MORGAN W Non-Executive Director
Transaction date
Planned sale
Price
907.94
Quantity 631 -5.9%
Value US$572,910
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
903.19
Quantity 424 -10.2%
Value US$382,953
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
904.15
Quantity 283 -6.4%
Value US$255,874
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
905.00
Quantity 400 -8.3%
Value US$362,000
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
908.00
Quantity 161 -3.2%
Value US$146,188
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
907.48
Quantity 900 -15.3%
Value US$816,732
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
910.05
Quantity 574 -8.9%
Value US$522,369
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
911.06
Quantity 14 -0.2%
Value US$12,755
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
912.40
Quantity 12 -0.2%
Value US$10,949
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
915.00
Quantity 61 -0.9%
Value US$55,815
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
916.18
Quantity 192 -2.8%
Value US$175,907
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
917.00
Quantity 211 -3.0%
Value US$193,487
1.3
Brouillette Yves Non-Executive Director
Transaction date
Sale
Price
918.61
Quantity 128 -1.8%
Value US$117,582
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
958.49
Quantity 1,000 -6.8%
Value US$958,490
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
949.98
Quantity 846 -5.5%
Value US$803,683
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
950.11
Quantity 9 -0.1%
Value US$8,551
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
950.25
Quantity 50 -0.3%
Value US$47,512
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
951.00
Quantity 82 -0.5%
Value US$77,982
2.0
SEELIG ROBERT LAWRENCE EVP & General Counsel Officer
Transaction date
Sale
Price
951.10
Quantity 13 -0.1%
Value US$12,364
SMITH LOWNDES ANDREW Non-Executive Director
Transaction date
Sale
Price
845.39
Quantity 100 -3.3%
Value US$84,539
SMITH LOWNDES ANDREW Non-Executive Director
Transaction date
Sale
Price
846.30
Quantity 100 -3.2%
Value US$84,630
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
892.06
Quantity 100 -0.6%
Value US$89,206
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
893.17
Quantity 5 -0.0%
Value US$4,466
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
893.18
Quantity 95 -0.5%
Value US$84,852
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
893.10
Quantity 100 -0.6%
Value US$89,310
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
891.26
Quantity 200 -1.1%
Value US$178,252
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
891.25
Quantity 100 -0.6%
Value US$89,125
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
889.20
Quantity 100 -0.6%
Value US$88,920
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
889.42
Quantity 100 -0.6%
Value US$88,942
DAVIS MORGAN W Non-Executive Director
Transaction date
Sale
Price
888.22
Quantity 100 -0.6%
Value US$88,822
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value
Number of shares Price Value Details
2025-12-22 2025-12-19 S Sale

Chief Executive Officer

Executive Director
64,663 -13.9%
295.86
US$1,163,454
64,663 -13.9% 295.86 US$1,163,454
2025-12-16 2025-12-16 S Sale Non-Executive Director
90,373 +20.0%
15.30
US$3,864,972
90,373 +20.0% 15.30 US$3,864,972
2023-11-20 2023-11-17 B Purchase Non-Executive Director
84,147 -27.6%
209.24
US$608,608
84,147 -27.6% 209.24 US$608,608
2023-11-20 2023-11-17 B Purchase Non-Executive Director
11 +0.5%
1,483.43
US$16,318
11 +0.5% 1,483.43 US$16,318
2023-11-20 2023-11-17 B Purchase Non-Executive Director
579 +39.2%
1,479.88
US$856,851
579 +39.2% 1,479.88 US$856,851
2023-11-20 2023-11-17 B Purchase Non-Executive Director
120 +8.8%
1,476.74
US$177,209
120 +8.8% 1,476.74 US$177,209
2023-11-20 2023-11-17 B Purchase Non-Executive Director
52 +4.0%
1,476.15
US$76,760
52 +4.0% 1,476.15 US$76,760
2022-12-27 2022-12-22 S Sale

MD & Chief Accounting Officer

Officer
100 -6.4%
1,371.84
US$137,184
100 -6.4% 1,371.84 US$137,184
2022-09-22 2022-09-20 S Sale Non-Executive Director
200 -20.2%
1,400.00
US$280,000
200 -20.2% 1,400.00 US$280,000
2022-09-22 2022-09-20 S Sale Non-Executive Director
945 -12.0%
1,400.00
US$1,323,000
945 -12.0% 1,400.00 US$1,323,000
2022-06-01 2022-05-31 S Sale

MD & Chief Accounting Officer

Officer
100 -6.0%
1,270.94
US$127,094
100 -6.0% 1,270.94 US$127,094
2021-02-11 2021-02-09 S Sale Non-Executive Director
337 -32.0%
1,117.00
US$376,429
337 -32.0% 1,117.00 US$376,429
2021-02-11 2021-02-09 S Sale Non-Executive Director
1,163 -52.5%
1,138.00
US$1,323,494
1,163 -52.5% 1,138.00 US$1,323,494
2020-03-25 2020-03-24 B Purchase Non-Executive Director
50 +0.7%
785.00
US$39,250
50 +0.7% 785.00 US$39,250
2020-03-25 2020-03-24 B Purchase Non-Executive Director
610 +8.7%
782.60
US$477,386
610 +8.7% 782.60 US$477,386
2020-03-25 2020-03-24 B Purchase Non-Executive Director
390 +5.9%
715.00
US$278,850
390 +5.9% 715.00 US$278,850
2019-12-11 2019-12-10 S Sale SMITH LOWNDES ANDREW Non-Executive Director
200 -15.4%
1,105.76
US$221,152
200 -15.4% 1,105.76 US$221,152
2019-08-09 2019-08-08 S Sale SMITH LOWNDES ANDREW Non-Executive Director
721 -35.6%
1,085.51
US$782,653
721 -35.6% 1,085.51 US$782,653
2019-08-09 2019-08-08 S Sale SMITH LOWNDES ANDREW Non-Executive Director
279 -12.1%
1,088.01
US$303,555
279 -12.1% 1,088.01 US$303,555
2019-06-26 2019-06-24 S Sale

EVP & General Counsel

10 -0.1%
1,052.31
US$10,523
10 -0.1% 1,052.31 US$10,523
2019-06-26 2019-06-24 S Sale

EVP & General Counsel

103 -0.9%
1,049.00
US$108,047
103 -0.9% 1,049.00 US$108,047
2019-06-26 2019-06-24 S Sale

EVP & General Counsel

70 -0.6%
1,048.14
US$73,370
70 -0.6% 1,048.14 US$73,370
2019-06-26 2019-06-24 S Sale

EVP & General Counsel

657 -5.3%
1,046.93
US$687,833
657 -5.3% 1,046.93 US$687,833
2019-06-26 2019-06-24 S Sale

EVP & General Counsel

160 -1.3%
1,039.50
US$166,320
160 -1.3% 1,039.50 US$166,320
2019-06-20 2019-06-18 S Sale

Chief Accounting Officer

431 -26.6%
1,016.57
US$438,142
431 -26.6% 1,016.57 US$438,142
2019-06-10 2019-06-10 S Sale
300 -11.5%
1,004.24
US$301,272
300 -11.5% 1,004.24 US$301,272
2019-06-10 2019-06-10 S Sale
200 -7.1%
1,005.40
US$201,080
200 -7.1% 1,005.40 US$201,080
2019-05-10 2019-05-09 S Sale

EVP & General Counsel

Officer
60 -0.5%
975.00
US$58,500
60 -0.5% 975.00 US$58,500
2019-05-10 2019-05-09 S Sale

EVP & General Counsel

Officer
860 -6.4%
977.34
US$840,512
860 -6.4% 977.34 US$840,512
2019-05-10 2019-05-09 S Sale

EVP & General Counsel

Officer
80 -0.6%
979.62
US$78,370
80 -0.6% 979.62 US$78,370
2019-05-10 2019-05-09 S Sale

EVP & General Counsel

Officer
83 -0.6%
985.20
US$81,772
83 -0.6% 985.20 US$81,772
2019-04-25 2019-04-25 S Sale
554 -15.6%
928.40
US$514,334
554 -15.6% 928.40 US$514,334
2019-04-25 2019-04-23 PlS Planned sale
696 -16.4%
910.11
US$633,437
696 -16.4% 910.11 US$633,437
2019-04-17 2019-04-16 PlS Planned sale
354 -7.7%
912.90
US$323,167
354 -7.7% 912.90 US$323,167
2019-04-12 2019-04-12 S Sale
585 -11.3%
916.95
US$536,416
585 -11.3% 916.95 US$536,416
2019-04-12 2019-04-10 PlS Planned sale
412 -7.4%
914.99
US$376,976
412 -7.4% 914.99 US$376,976
2019-04-05 2019-04-04 PlS Planned sale
910 -14.0%
923.65
US$840,522
910 -14.0% 923.65 US$840,522
2019-04-02 2019-04-02 S Sale
362 -5.3%
925.00
US$334,850
362 -5.3% 925.00 US$334,850
2019-04-02 2019-04-01 PlS Planned sale
852 -11.0%
924.15
US$787,376
852 -11.0% 924.15 US$787,376
2019-03-28 2019-03-27 PlS Planned sale
601 -7.2%
922.66
US$554,519
601 -7.2% 922.66 US$554,519
2019-03-27 2019-03-26 B Purchase Non-Executive Director
495 +256.5%
918.46
US$454,638
495 +256.5% 918.46 US$454,638
2019-03-27 2019-03-26 B Purchase Non-Executive Director
5 +2.7%
917.05
US$4,585
5 +2.7% 917.05 US$4,585
2019-03-26 2019-03-26 S Sale
400 -13.6%
916.70
US$366,680
400 -13.6% 916.70 US$366,680
2019-03-25 2019-03-22 PlS Planned sale
709 -7.8%
914.00
US$648,026
709 -7.8% 914.00 US$648,026
2019-03-20 2019-03-19 PlS Planned sale Non-Executive Director
954 -9.6%
925.21
US$882,650
954 -9.6% 925.21 US$882,650
2019-03-14 2019-03-13 PlS Planned sale Non-Executive Director
631 -5.9%
907.94
US$572,910
631 -5.9% 907.94 US$572,910
2019-03-13 2019-03-12 S Sale Non-Executive Director
424 -10.2%
903.19
US$382,953
424 -10.2% 903.19 US$382,953
2019-03-13 2019-03-12 S Sale Non-Executive Director
283 -6.4%
904.15
US$255,874
283 -6.4% 904.15 US$255,874
2019-03-13 2019-03-12 S Sale Non-Executive Director
400 -8.3%
905.00
US$362,000
400 -8.3% 905.00 US$362,000
2019-03-13 2019-03-12 S Sale Non-Executive Director
161 -3.2%
908.00
US$146,188
161 -3.2% 908.00 US$146,188
2019-03-13 2019-03-11 S Sale Non-Executive Director
900 -15.3%
907.48
US$816,732
900 -15.3% 907.48 US$816,732
2019-03-13 2019-03-11 S Sale Non-Executive Director
574 -8.9%
910.05
US$522,369
574 -8.9% 910.05 US$522,369
2019-03-13 2019-03-11 S Sale Non-Executive Director
14 -0.2%
911.06
US$12,755
14 -0.2% 911.06 US$12,755
2019-03-13 2019-03-11 S Sale Non-Executive Director
12 -0.2%
912.40
US$10,949
12 -0.2% 912.40 US$10,949
2019-03-13 2019-03-11 S Sale Non-Executive Director
61 -0.9%
915.00
US$55,815
61 -0.9% 915.00 US$55,815
2019-03-13 2019-03-11 S Sale Non-Executive Director
192 -2.8%
916.18
US$175,907
192 -2.8% 916.18 US$175,907
2019-03-13 2019-03-11 S Sale Non-Executive Director
211 -3.0%
917.00
US$193,487
211 -3.0% 917.00 US$193,487
2019-03-13 2019-03-11 S Sale Non-Executive Director
128 -1.8%
918.61
US$117,582
128 -1.8% 918.61 US$117,582
2019-03-07 2019-03-06 S Sale

EVP & General Counsel

Officer
1,000 -6.8%
958.49
US$958,490
1,000 -6.8% 958.49 US$958,490
2019-03-07 2019-03-05 S Sale

EVP & General Counsel

Officer
846 -5.5%
949.98
US$803,683
846 -5.5% 949.98 US$803,683
2019-03-07 2019-03-05 S Sale

EVP & General Counsel

Officer
9 -0.1%
950.11
US$8,551
9 -0.1% 950.11 US$8,551
2019-03-07 2019-03-05 S Sale

EVP & General Counsel

Officer
50 -0.3%
950.25
US$47,512
50 -0.3% 950.25 US$47,512
2019-03-07 2019-03-05 S Sale

EVP & General Counsel

Officer
82 -0.5%
951.00
US$77,982
82 -0.5% 951.00 US$77,982
2019-03-07 2019-03-05 S Sale

EVP & General Counsel

Officer
13 -0.1%
951.10
US$12,364
13 -0.1% 951.10 US$12,364
2018-12-21 2018-12-20 S Sale SMITH LOWNDES ANDREW Non-Executive Director
100 -3.3%
845.39
US$84,539
100 -3.3% 845.39 US$84,539
2018-12-21 2018-12-20 S Sale SMITH LOWNDES ANDREW Non-Executive Director
100 -3.2%
846.30
US$84,630
100 -3.2% 846.30 US$84,630
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
100 -0.6%
892.06
US$89,206
100 -0.6% 892.06 US$89,206
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
5 -0.0%
893.17
US$4,466
5 -0.0% 893.17 US$4,466
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
95 -0.5%
893.18
US$84,852
95 -0.5% 893.18 US$84,852
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
100 -0.6%
893.10
US$89,310
100 -0.6% 893.10 US$89,310
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
200 -1.1%
891.26
US$178,252
200 -1.1% 891.26 US$178,252
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
100 -0.6%
891.25
US$89,125
100 -0.6% 891.25 US$89,125
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
100 -0.6%
889.20
US$88,920
100 -0.6% 889.20 US$88,920
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
100 -0.6%
889.42
US$88,942
100 -0.6% 889.42 US$88,942
2018-05-16 2018-05-15 S Sale DAVIS MORGAN W Non-Executive Director
100 -0.6%
888.22
US$88,822
100 -0.6% 888.22 US$88,822