Vault-13

WHITE MTNS INS GROUP LTD WTM

COM · Common Stock · CUSIP G9618E107

306 institutional holders +3 vs Q1 2024
2,277,9562.3m shares reported held*
88.7% of all shares outstanding*
$4.1bnreported value*
28 new 104 added 87 reduced 26 sold out net sold ≈ $633.2m (-483.6k shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($62.8m this quarter). Holder counts are more reliable. Shares outstanding: 2.6m as of 2024-08-02, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $1816.71.

Trends to Q2 2024

Institutional holders

Managers reporting a position, each quarter

0200400Q3 22: 253Q4 22: 264Q1 23: 262Q2 23: 258Q3 23: 272Q4 23: 295Q1 24: 303Q2 24: 306306Q3 22Q1 23Q3 23Q1 24Q2 24
Numbers
QuarterHolders
Q3 2022253
Q4 2022264
Q1 2023262
Q2 2023258
Q3 2023272
Q4 2023295
Q1 2024303
Q2 2024306

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
2000200Q4 22: 96 bought or addedQ4 22: 110 cut or sold outQ4 22Q1 23: 100 bought or addedQ1 23: 106 cut or sold outQ2 23: 96 bought or addedQ2 23: 119 cut or sold outQ2 23Q3 23: 110 bought or addedQ3 23: 100 cut or sold outQ4 23: 114 bought or addedQ4 23: 116 cut or sold outQ4 23Q1 24: 129 bought or addedQ1 24: 121 cut or sold outQ2 24: 132 bought or addedQ2 24: 113 cut or sold outQ2 24
Numbers
QuarterBought or addedCut or sold out
Q4 202296110
Q1 2023100106
Q2 202396119
Q3 2023110100
Q4 2023114116
Q1 2024129121
Q2 2024132113

Biggest buyers

NEUBERGER BERMAN GROUP LLC Added +16,147+16.1k
FIDUCIARY MANAGEMENT INC /WI/ Added +10,361+10.4k
Select Equity Group, L.P. Added +9,430+9.4k
WELLINGTON MANAGEMENT GROUP LLP Added +8,783+8.8k
Invesco Ltd. Added +6,728+6.7k
FMR LLC Added +5,667+5.7k
LORD, ABBETT & CO. LLC Added +4,220+4.2k
FIRST TRUST ADVISORS LP Added +4,157+4.2k
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Added +3,900+3.9k
STATE STREET CORP Added +3,543+3.5k

Biggest sellers

MORGAN STANLEY Reduced -371,655-371.7k
Global Assets Advisory, LLC Sold out -134,528-134.5k
Robeco Institutional Asset Management B.V. Reduced -8,245-8.2k
Cove Street Capital, LLC Reduced -7,572-7.6k
River Road Asset Management, LLC Reduced -7,001-7.0k
AMERICAN CENTURY COMPANIES INC Reduced -6,088-6.1k
THOMPSON SIEGEL & WALMSLEY LLC Reduced -3,948-3.9k
Perpetual Ltd Reduced -3,900-3.9k
SOUTHEASTERN ASSET MANAGEMENT INC/TN/ Reduced -3,285-3.3k
Boston Partners Reduced -2,923-2.9k

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 5.2% new 128.0k≈ $265.4m 2026-04-30

Fell to 5% or below in the last year: Neuberger Berman Group LLC (4.9%, 2026-05-07), VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD CAPITAL MANAGEMENT LLC), MORGAN STANLEY (3.0%, 2026-02-12)

Insider purchases and sales in Q2 2024

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
202Q3 22: 0 buyingQ3 22: 2 sellingQ4 22: 0 buyingQ4 22: 1 sellingQ4 22Q1 23: 0 buyingQ1 23: 0 sellingQ2 23: 0 buyingQ2 23: 0 sellingQ2 23Q3 23: 0 buyingQ3 23: 0 sellingQ4 23: 1 buyingQ4 23: 0 sellingQ4 23Q1 24: 0 buyingQ1 24: 0 sellingQ2 24: 0 buyingQ2 24: 0 sellingQ2 24
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q3 20220—2$1.6m—
Q4 20220—1$137.2k—
Q1 20230—0——
Q2 20230—0——
Q3 20230—0——
Q4 20231$1.5m0——
Q1 20240—0——
Q2 20240—0——

None reported in Q2 2024.

Holders, Q2 2024

#ManagerLocationShares Value% of their portfolioChangeShares change
1 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 251,035251.0k $456.2m $456.2m 0.01% Reduced -895 -895
2 MORGAN STANLEY 0.03% of their portfolio NEW YORK, NY 184,935184.9k $336.1m $336.1m 0.03% Reduced -371.7k -371,655
3 DIMENSIONAL FUND ADVISORS LP 0.08% of their portfolio AUSTIN, TX 159,561159.6k $290.0m $290.0m 0.08% Reduced -2.4k -2,357
4 FULLER & THALER ASSET MANAGEMENT, INC. 1.01% of their portfolio SAN MATEO, CA 129,283129.3k $235.0m $235.0m 1.01% Reduced -1.6k -1,631
5 BlackRock Inc. 0.00% of their portfolio New York, NY 116,455116.5k $211.7m $211.7m 0.00% Added +1.5k +1,482
6 River Road Asset Management, LLC 3.03% of their portfolio LOUISVILLE, KY 116,320116.3k $211.4m $211.4m 3.03% Reduced -7.0k -7,001
7 Boston Partners 0.20% of their portfolio BOSTON, MA 87,67187.7k $158.9m $158.9m 0.20% Reduced -2.9k -2,923
8 Wallace Capital Management Inc. 21.41% of their portfolio DALLAS, TX 81,30481.3k $147.8m $147.8m 21.41% Reduced -773 -773
9 WELLINGTON MANAGEMENT GROUP LLP 0.02% of their portfolio Boston, MA 69,78969.8k $126.8m $126.8m 0.02% Added +8.8k +8,783
10 LONDON CO OF VIRGINIA 0.68% of their portfolio RICHMOND, VA 66,45666.5k $120.8m $120.8m 0.68% Reduced -139 -139
11 LORD, ABBETT & CO. LLC 0.18% of their portfolio JERSEY CITY, NJ 61,16461.2k $111.2m $111.2m 0.18% Added +4.2k +4,220
12 Select Equity Group, L.P. 0.43% of their portfolio NEW YORK, NY 59,36159.4k $107.9m $107.9m 0.43% Added +9.4k +9,430
13 T. Rowe Price Investment Management, Inc. 0.07% of their portfolio BALTIMORE, MD 57,75657.8k $105.0m $105.0m 0.07% Reduced -1.5k -1,533
14 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 52,16352.2k $94.8m $94.8m 0.00% Added +3.5k +3,543
15 FIDUCIARY MANAGEMENT INC /WI/ 0.83% of their portfolio MILWAUKEE, WI 49,35649.4k $89.7m $89.7m 0.83% Added +10.4k +10,361
16 BANK OF AMERICA CORP /DE/ 0.01% of their portfolio CHARLOTTE, NC 41,18641.2k $74.9m $74.9m 0.01% Added +456 +456
17 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 39,57139.6k $71.9m $71.9m 0.01% Added +672 +672
18 REINHART PARTNERS, LLC. 2.86% of their portfolio MEQUON, WI 37,87937.9k $68.8m $68.8m 2.86% Reduced -346 -346
19 NORGES BANK 0.01% of their portfolio OSLO, Q8 30,10630.1k $54.7m $54.7m 0.01% Added +556 +556
20 Cannell & Spears LLC 1.13% of their portfolio NEW YORK, NY 30,06630.1k $54.6m $54.6m 1.13% Reduced -170 -170
21 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio SAN FRANCISCO, CA 24,84124.8k $45.1m $45.1m 0.01% Added +12 +12
22 BROWN ADVISORY INC 0.05% of their portfolio BALTIMORE, MD 22,81522.8k $41.5m $41.5m 0.05% Reduced -306 -306
23 RAYMOND JAMES & ASSOCIATES 0.03% of their portfolio ST PETERSBURG, FL 22,68822.7k $41.2m $41.2m 0.03% Reduced -649 -649
24 SOUTHEASTERN ASSET MANAGEMENT INC/TN/ 1.70% of their portfolio MEMPHIS, TN 21,42321.4k $38.9m $38.9m 1.70% Reduced -3.3k -3,285
25 Robeco Institutional Asset Management B.V. 0.08% of their portfolio ROTTERDAM, P7 21,37821.4k $38.9m $38.9m 0.08% Reduced -8.2k -8,245
26 Mraz, Amerine & Associates, Inc. 7.85% of their portfolio Modesto, CA 21,03121.0k $38.2m $38.2m 7.85% Reduced -509 -509
27 FMR LLC 0.00% of their portfolio BOSTON, MA 20,58620.6k $37.4m $37.4m 0.00% Added +5.7k +5,667
28 NEUBERGER BERMAN GROUP LLC 0.03% of their portfolio NEW YORK, NY 17,16117.2k $31.2m $31.2m 0.03% Added +16.1k +16,147
29 ELKHORN PARTNERS LIMITED PARTNERSHIP 20.16% of their portfolio OMAHA, NE 16,11016.1k $29.3m $29.3m 20.16% Reduced -90 -90
30 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 15,94215.9k $29.0m $29.0m 0.00% Added +1.3k +1,346
31 Allspring Global Investments Holdings, LLC 0.05% of their portfolio CHARLOTTE, NC 15,65915.7k $28.5m $28.5m 0.05% Added +1.8k +1,820
32 ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio Berwyn, PA 15,26915.3k $27.8m $27.8m 0.01% Added +1.0k +1,013
33 ROYCE & ASSOCIATES LP 0.26% of their portfolio New York, NY 15,02515.0k $27.3m $27.3m 0.26% Reduced -1.1k -1,117
34 SCOUT INVESTMENTS, INC. 0.73% of their portfolio KANSAS CITY, MO 14,97215.0k $27.2m $27.2m 0.73% Reduced -1.6k -1,563
35 AMERICAN CENTURY COMPANIES INC 0.02% of their portfolio KANSAS CITY, MO 14,70314.7k $26.7m $26.7m 0.02% Reduced -6.1k -6,088
36 California Public Employees Retirement System 0.02% of their portfolio Sacramento, CA 14,30214.3k $26.0m $26.0m 0.02% Added +224 +224
37 THOMPSON SIEGEL & WALMSLEY LLC 0.35% of their portfolio RICHMOND, VA 11,91711.9k $21.7m $21.7m 0.35% Reduced -3.9k -3,948
38 FIRST TRUST ADVISORS LP 0.02% of their portfolio Wheaton, IL 11,63011.6k $21.1m $21.1m 0.02% Added +4.2k +4,157
39 VICTORY CAPITAL MANAGEMENT INC 0.02% of their portfolio San Antonio, TX 11,43711.4k $20.8m $20.8m 0.02% Reduced -2.8k -2,814
40 SPEECE THORSON CAPITAL GROUP INC 4.25% of their portfolio MINNETONKA, MN 11,43111.4k $20.8m $20.8m 4.25% Reduced -2.3k -2,320
41 WELLS FARGO & COMPANY/MN 0.01% of their portfolio SAN FRANCISCO, CA 11,24611.2k $20.4m $20.4m 0.01% Reduced -263 -263
42 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 11,04611.0k $20.1m $20.1m 0.00% Added +6.7k +6,728
43 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 10,86810.9k $19.8m $19.8m 0.00% Added +930 +930
44 AQR CAPITAL MANAGEMENT LLC 0.03% of their portfolio Greenwich, CT 10,44810.4k $18.5m $18.5m 0.03% Added +1.3k +1,296
45 Perpetual Ltd 0.20% of their portfolio SYDNEY, NEW SOUTH WALES, C3 10,17610.2k $18.5m $18.5m 0.20% Reduced -3.9k -3,900
46 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 7,8327.8k $14.2m $14.2m 0.00% Added +2.5k +2,507
47 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 7,7197.7k $14.0m $14.0m 0.00% Added +3.9k +3,900
48 GW&K Investment Management, LLC 0.12% of their portfolio BOSTON, MA 7,4327.4k $13.5m $13.5m 0.12% Added +524 +524
49 HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC 0.04% of their portfolio Los Angeles, CA 6,9446.9k $12.6m $12.6m 0.04% Added +244 +244
50 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 6,1686.2k $11.2m $11.2m 0.00% Reduced -42 -42
51 Alaska Permanent Fund Corp 0.16% of their portfolio JUNEAU, AK 5,9025.9k $10.5m $10.5m 0.16% Added +5 +5
52 Williams Jones Wealth Management, LLC. 0.12% of their portfolio NEW YORK, NY 5,1935.2k $9.4m $9.4m 0.12% Unchanged
53 Swiss National Bank 0.01% of their portfolio ZURICH, V8 5,0465.0k $9.2m $9.2m 0.01% Unchanged
54 RHUMBLINE ADVISERS 0.01% of their portfolio BOSTON, MA 4,5474.5k $8.3m $8.3m 0.01% Reduced -276 -276
55 Brandywine Global Investment Management, LLC 0.06% of their portfolio PHILADELPHIA, PA 4,2334.2k $7.7m $7.7m 0.06% Reduced -273 -273
56 Legal & General Group Plc 0.00% of their portfolio London, X0 3,7723.8k $6.9m $6.9m 0.00% Reduced -599 -599
57 EAGLE ASSET MANAGEMENT INC 0.03% of their portfolio ST PETERSBURG, FL 3,6193.6k $6.4m $6.4m 0.03% Reduced -722 -722
58 D. E. Shaw & Co., Inc. 0.01% of their portfolio New York, NY 3,6003.6k $6.5m $6.5m 0.01% Reduced -130 -130
59 PROSPECTOR PARTNERS LLC 0.70% of their portfolio GUILFORD, CT 3,2893.3k $6.0m $6.0m 0.70% Reduced -4 -4
60 LEE DANNER & BASS INC 0.46% of their portfolio NASHVILLE, TN 3,2833.3k $6.0m $6.0m 0.46% First filing
61 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 3,0853.1k $5.6m $5.6m 0.00% Reduced -545 -545
62 NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio ALBANY, NY 2,7232.7k $4.9m $4.9m 0.01% Added +141 +141
63 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 2,4902.5k $4.5m $4.5m 0.01% Reduced -64 -64
64 Cove Street Capital, LLC 3.24% of their portfolio El Segundo, CA 2,4852.5k $4.5m $4.5m 3.24% Reduced -7.6k -7,572
65 SEI INVESTMENTS CO 0.01% of their portfolio OAKS, PA 2,3892.4k $4.3m $4.3m 0.01% Reduced -29 -29
66 Creative Planning 0.00% of their portfolio OVERLAND PARK, KS 2,3742.4k $4.3m $4.3m 0.00% Added +46 +46
67 Man Group plc 0.01% of their portfolio LONDON, X0 2,3342.3k $4.2m $4.2m 0.01% Added +825 +825
68 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 2,2542.3k $4.1m $4.1m 0.00% Added +406 +406
69 DAVENPORT & Co LLC 0.02% of their portfolio RICHMOND, VA 2,1712.2k $3.9m $3.9m 0.02% Reduced -17 -17
70 RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio NEW YORK, NY 2,0002.0k $3.6m $3.6m 0.01% Reduced -400 -400
71 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio TALLAHASSEE, FL 1,9121.9k $3.5m $3.5m 0.01% Reduced -1.2k -1,158
72 MML INVESTORS SERVICES, LLC 0.01% of their portfolio SPRINGFIELD, MA 1,8571.9k $3.4m $3.4m 0.01% Added +392 +392
73 TRUIST FINANCIAL CORP 0.00% of their portfolio CHARLOTTE, NC 1,8031.8k $3.3m $3.3m 0.00% Reduced -14 -14
74 UBS Group AG 0.00% of their portfolio ZURICH, V8 1,7471.7k $3.2m $3.2m 0.00% Reduced -17 -17
75 Cerity Partners LLC 0.01% of their portfolio NEW YORK, NY 1,7291.7k $3.1m $3.1m 0.01% Added +124 +124
76 Vident Advisory, LLC 0.09% of their portfolio Alpharetta, GA 1,7241.7k $3.1m $3.1m 0.09% Added +49 +49
77 STIFEL FINANCIAL CORP 0.00% of their portfolio ST. LOUIS, MO 1,6511.7k $3.0m $3.0m 0.00% Added +14 +14
78 Qube Research & Technologies Ltd 0.01% of their portfolio LONDON, X0 1,6441.6k $3.0m $3.0m 0.01% Added +75 +75
79 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 1,5421.5k $2.8m $2.8m 0.00% Reduced -198 -198
80 PARSONS CAPITAL MANAGEMENT INC/RI 0.18% of their portfolio PROVIDENCE, RI 1,4731.5k $2.7m $2.7m 0.18% Added +332 +332
81 OPPENHEIMER ASSET MANAGEMENT INC. 0.03% of their portfolio NEW YORK, NY 1,4521.5k $2.6m $2.6m 0.03% Added +47 +47
82 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 1,3731.4k $2.5m $2.5m 0.00% Added +57 +57
83 HORIZON KINETICS ASSET MANAGEMENT LLC 0.04% of their portfolio NEW YORK, NY 1,3651.4k $2.5m $2.5m 0.04% New
84 STRS OHIO 0.01% of their portfolio COLUMBUS, OH 1,3471.3k $2.4m $2.4m 0.01% Reduced -120 -120
85 Quantinno Capital Management LP 0.04% of their portfolio NEW YORK, NY 1,3271.3k $2.4m $2.4m 0.04% Added +81 +81
86 TD Asset Management Inc 0.00% of their portfolio Toronto, A6 1,3001.3k $2.4m $2.4m 0.00% Unchanged
87 MARTINGALE ASSET MANAGEMENT L P 0.05% of their portfolio BOSTON, MA 1,2531.3k $2.3m $2.3m 0.05% Reduced -2.0k -2,002
88 JANUS HENDERSON GROUP PLC 0.00% of their portfolio LONDON, X0 1,2231.2k $2.2m $2.2m 0.00% Reduced -12 -12
89 Forum Financial Management, LP 0.04% of their portfolio LOMBARD, IL 1,1981.2k $2.2m $2.2m 0.04% Unchanged
90 HARBOR CAPITAL ADVISORS, INC. 0.17% of their portfolio CHICAGO, IL 1,1921.2k $2.2m $2.2m 0.17% Added +880 +880
91 State of New Jersey Common Pension Fund D 0.01% of their portfolio TRENTON, NJ 1,1891.2k $2.2m $2.2m 0.01% Reduced -472 -472
92 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 1,1831.2k $2.2m $2.2m 0.00% Reduced -48 -48
93 1834 INVESTMENT ADVISORS CO 0.26% of their portfolio Milwaukee, WI 1,1761.2k $2.1m $2.1m 0.26% Unchanged
94 PECAUT & CO. 0.80% of their portfolio SIOUX CITY, IA 1,1671.2k $2.1m $2.1m 0.80% Unchanged
95 NISA INVESTMENT ADVISORS, LLC 0.01% of their portfolio ST. LOUIS, MO 1,1001.1k $2.0m $2.0m 0.01% Unchanged
96 Ensign Peak Advisors, Inc 0.00% of their portfolio SALT LAKE CITY, UT 1,0951.1k $2.0m $2.0m 0.00% Added +95 +95
97 LPL Financial LLC 0.00% of their portfolio FORT MILL, SC 1,0901.1k $2.0m $2.0m 0.00% Added +35 +35
98 Treasurer of the State of North Carolina 0.01% of their portfolio RALEIGH, NC 1,0861.1k $2.0m $2.0m 0.01% Reduced -164 -164
99 Autumn Glory Partners, LLC 1.00% of their portfolio DALLAS, TX 1,0801.1k $2.0m $2.0m 1.00% Unchanged
100 AGF MANAGEMENT LTD 0.01% of their portfolio TORONTO, A6 1,0701.1k $1.9m $1.9m 0.01% Reduced -18 -18