WHITE MTNS INS GROUP LTD

Ticker: WTM CUSIP: G9618E107 Class: COM

BROWN ADVISORY INC's Holding History (CIK: 0001345929)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 18,956 Value ($000) $39,393 Avg Close $1955.46 Range $1648.00 - $2143.25

Q3 2025

Shares 20,332 Value ($000) $33,987 Avg Close $1784.36 Range $1659.17 - $1880.11

Q2 2025

Shares 20,854 Value ($000) $37,450 Avg Close $1778.53 Range $1678.87 - $1937.23

Q1 2025

Shares 22,076 Value ($000) $42,514 Avg Close $1882.39 Range $1803.96 - $1993.86

Q4 2024

Shares 22,421 Value ($000) $43,610 Avg Close $1889.39 Range $1708.50 - $2023.00

Q3 2024

Shares 23,149 Value ($000) $39,265 Avg Close $1743.65 Range $1666.22 - $1847.78

Q2 2024

Shares 22,815 Value ($000) $41,465 Avg Close $1768.70 Range $1665.71 - $1899.21

Q1 2024

Shares 23,121 Value ($000) $41,486 Avg Close $1676.26 Range $1475.00 - $1849.99

Q4 2023

Shares 16,429 Value ($000) $24,726 Avg Close $1486.19 Range $1401.01 - $1562.63

Q3 2023

Shares 16,709 Value ($000) $24,992 Avg Close $1535.39 Range $1370.75 - $1617.00

Q2 2023

Shares 9,449 Value ($000) $13,124 Avg Close $1407.80 Range $1319.05 - $1540.09

Q1 2023

Shares 10,072 Value ($000) $13,874 Avg Close $1434.16 Range $1312.00 - $1560.21

Q4 2022

Shares 3,167 Value ($000) $4,479 Avg Close $1355.05 Range $1276.05 - $1435.45

Q3 2022

Shares 3,075 Value ($000) $4,007 Avg Close $1293.71 Range $1172.00 - $1393.48

Q2 2022

Shares 3,075 Value ($000) $3,832 Avg Close $1161.60 Range $1030.38 - $1291.50

Q1 2022

Shares 3,229 Value ($000) $3,669 Avg Close $1046.91 Range $982.60 - $1141.97

Q4 2021

Shares 3,446 Value ($000) $3,494 Avg Close $1056.38 Range $978.51 - $1137.50

Q3 2021

Shares 3,517 Value ($000) $3,762 Avg Close $1116.81 Range $1056.96 - $1179.20

Q2 2021

Shares 3,521 Value ($000) $4,042 Avg Close $1167.46 Range $1100.61 - $1243.00

Q1 2021

Shares 3,517 Value ($000) $3,921 Avg Close $1118.45 Range $994.91 - $1267.52

Q4 2020

Shares 3,517 Value ($000) $3,519 Avg Close $940.82 Range $778.11 - $1024.02

Q3 2020

Shares 3,702 Value ($000) $2,884 Avg Close $864.63 Range $752.10 - $961.96

Q2 2020

Shares 3,804 Value ($000) $3,378 Avg Close $901.27 Range $813.24 - $1012.83

Q1 2020

Shares 3,800 Value ($000) $3,458 Avg Close $1035.04 Range $629.21 - $1168.21

Q4 2019

Shares 3,840 Value ($000) $4,283 Avg Close $1090.77 Range $1054.00 - $1131.50

Q3 2019

Shares 3,898 Value ($000) $4,210 Avg Close $1066.63 Range $1025.25 - $1104.14

Q2 2019

Shares 3,859 Value ($000) $3,942 Avg Close $961.99 Range $906.22 - $1052.17

Q1 2019

Shares 4,095 Value ($000) $3,790 Avg Close $905.92 Range $850.75 - $961.49

Q4 2018

Shares 4,126 Value ($000) $3,539 Avg Close $891.29 Range $832.88 - $942.35

Q3 2018

Shares 4,126 Value ($000) $3,861 Avg Close $926.90 Range $895.01 - $980.89

Q2 2018

Shares 4,179 Value ($000) $3,789 Avg Close $880.88 Range $804.40 - $933.70

Q1 2018

Shares 4,239 Value ($000) $3,487 Avg Close $825.48 Range $786.23 - $858.09

Q4 2017

Shares 4,237 Value ($000) $3,607 Avg Close $874.10 Range $841.33 - $903.26

Q3 2017

Shares 4,297 Value ($000) $3,683 Avg Close $859.82 Range $838.65 - $888.00

Q2 2017

Shares 4,401 Value ($000) $3,822 Avg Close $867.55 Range $845.41 - $900.05

Q1 2017

Shares 4,859 Value ($000) $4,275 Avg Close $895.74 Range $834.20 - $948.94

Q4 2016

Shares 4,947 Value ($000) $4,135 Avg Close $838.09 Range $815.04 - $874.69

Q3 2016

Shares 4,940 Value ($000) $4,100 Avg Close $824.01 Range $804.44 - $852.58

Q2 2016

Shares 4,940 Value ($000) $4,159 Avg Close $815.85 Range $786.33 - $845.37

Q1 2016

Shares 4,937 Value ($000) $3,962 Avg Close $748.05 Range $689.31 - $809.99

Q4 2015

Shares 5,024 Value ($000) $3,651 Avg Close $765.83 Range $721.00 - $808.00

Q3 2015

Shares 5,031 Value ($000) $3,760 Avg Close $719.51 Range $645.00 - $778.19

Q2 2015

Shares 4,520 Value ($000) $2,960 Avg Close $663.32 Range $635.00 - $704.50

Q1 2015

Shares 5,210 Value ($000) $3,567 Avg Close $659.70 Range $618.00 - $696.48

Q4 2014

Shares 5,331 Value ($000) $3,359 Avg Close $635.98 Range $610.00 - $682.87

Q3 2014

Shares 5,305 Value ($000) $3,343 Avg Close $624.10 Range $599.35 - $645.00

Q2 2014

Shares 5,305 Value ($000) $3,228 Avg Close $595.51 Range $583.51 - $608.63

Q1 2014

Shares 5,368 Value ($000) $3,220 Avg Close $583.55 Range $557.26 - $603.88

Q4 2013

Shares 5,320 Value ($000) $3,209 Avg Close $589.37 Range $566.30 - $606.94

Q3 2013

Shares 5,320 Value ($000) $3,020 Avg Close $580.72 Range $555.51 - $615.88

Q2 2013

Shares 5,490 Value ($000) $3,156 Avg Close $583.58 Range $561.79 - $615.00

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	18,956	$39,393	$1955.46	$1648.00 - $2143.25
Q3 2025	20,332	$33,987	$1784.36	$1659.17 - $1880.11
Q2 2025	20,854	$37,450	$1778.53	$1678.87 - $1937.23
Q1 2025	22,076	$42,514	$1882.39	$1803.96 - $1993.86
Q4 2024	22,421	$43,610	$1889.39	$1708.50 - $2023.00
Q3 2024	23,149	$39,265	$1743.65	$1666.22 - $1847.78
Q2 2024	22,815	$41,465	$1768.70	$1665.71 - $1899.21
Q1 2024	23,121	$41,486	$1676.26	$1475.00 - $1849.99
Q4 2023	16,429	$24,726	$1486.19	$1401.01 - $1562.63
Q3 2023	16,709	$24,992	$1535.39	$1370.75 - $1617.00
Q2 2023	9,449	$13,124	$1407.80	$1319.05 - $1540.09
Q1 2023	10,072	$13,874	$1434.16	$1312.00 - $1560.21
Q4 2022	3,167	$4,479	$1355.05	$1276.05 - $1435.45
Q3 2022	3,075	$4,007	$1293.71	$1172.00 - $1393.48
Q2 2022	3,075	$3,832	$1161.60	$1030.38 - $1291.50
Q1 2022	3,229	$3,669	$1046.91	$982.60 - $1141.97
Q4 2021	3,446	$3,494	$1056.38	$978.51 - $1137.50
Q3 2021	3,517	$3,762	$1116.81	$1056.96 - $1179.20
Q2 2021	3,521	$4,042	$1167.46	$1100.61 - $1243.00
Q1 2021	3,517	$3,921	$1118.45	$994.91 - $1267.52
Q4 2020	3,517	$3,519	$940.82	$778.11 - $1024.02
Q3 2020	3,702	$2,884	$864.63	$752.10 - $961.96
Q2 2020	3,804	$3,378	$901.27	$813.24 - $1012.83
Q1 2020	3,800	$3,458	$1035.04	$629.21 - $1168.21
Q4 2019	3,840	$4,283	$1090.77	$1054.00 - $1131.50
Q3 2019	3,898	$4,210	$1066.63	$1025.25 - $1104.14
Q2 2019	3,859	$3,942	$961.99	$906.22 - $1052.17
Q1 2019	4,095	$3,790	$905.92	$850.75 - $961.49
Q4 2018	4,126	$3,539	$891.29	$832.88 - $942.35
Q3 2018	4,126	$3,861	$926.90	$895.01 - $980.89
Q2 2018	4,179	$3,789	$880.88	$804.40 - $933.70
Q1 2018	4,239	$3,487	$825.48	$786.23 - $858.09
Q4 2017	4,237	$3,607	$874.10	$841.33 - $903.26
Q3 2017	4,297	$3,683	$859.82	$838.65 - $888.00
Q2 2017	4,401	$3,822	$867.55	$845.41 - $900.05
Q1 2017	4,859	$4,275	$895.74	$834.20 - $948.94
Q4 2016	4,947	$4,135	$838.09	$815.04 - $874.69
Q3 2016	4,940	$4,100	$824.01	$804.44 - $852.58
Q2 2016	4,940	$4,159	$815.85	$786.33 - $845.37
Q1 2016	4,937	$3,962	$748.05	$689.31 - $809.99
Q4 2015	5,024	$3,651	$765.83	$721.00 - $808.00
Q3 2015	5,031	$3,760	$719.51	$645.00 - $778.19
Q2 2015	4,520	$2,960	$663.32	$635.00 - $704.50
Q1 2015	5,210	$3,567	$659.70	$618.00 - $696.48
Q4 2014	5,331	$3,359	$635.98	$610.00 - $682.87
Q3 2014	5,305	$3,343	$624.10	$599.35 - $645.00
Q2 2014	5,305	$3,228	$595.51	$583.51 - $608.63
Q1 2014	5,368	$3,220	$583.55	$557.26 - $603.88
Q4 2013	5,320	$3,209	$589.37	$566.30 - $606.94
Q3 2013	5,320	$3,020	$580.72	$555.51 - $615.88
Q2 2013	5,490	$3,156	$583.58	$561.79 - $615.00