Vault-13

WHITE MTNS INS GROUP LTD WTM

COM · Common Stock · CUSIP G9618E107

258 institutional holders -4 vs Q1 2023
2,218,5542.2m shares reported held*
86.6% of all shares outstanding*
$3.1bnreported value*
26 new 70 added 91 reduced 28 sold out net sold ≈ $11.2m (-10.8k 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 ($70.3m this quarter). Holder counts are more reliable. Shares outstanding: 2.6m as of 2023-08-03, 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 ≈ $1391.81.

Trends to Q2 2023

Institutional holders

Managers reporting a position, each quarter

0100200300Q3 22: 253Q4 22: 264Q1 23: 262Q2 23: 258258Q3 22Q4 22Q1 23Q2 23
Numbers
QuarterHolders
Q3 2022253
Q4 2022264
Q1 2023262
Q2 2023258

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 outQ1 23Q2 23: 96 bought or addedQ2 23: 119 cut or sold outQ2 23
Numbers
QuarterBought or addedCut or sold out
Q4 202296110
Q1 2023100106
Q2 202396119

Biggest buyers

LORD, ABBETT & CO. LLC New +47,318+47.3k
T. Rowe Price Investment Management, Inc. New +9,652+9.7k
WELLINGTON MANAGEMENT GROUP LLP Added +8,911+8.9k
Wallace Capital Management Inc. Added +8,357+8.4k
FRANKLIN RESOURCES INC New +4,143+4.1k
AQR CAPITAL MANAGEMENT LLC Added +2,566+2.6k
FIDUCIARY MANAGEMENT INC /WI/ Added +2,072+2.1k
MILLENNIUM MANAGEMENT LLC Added +1,819+1.8k
Man Group plc New +1,756+1.8k
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Added +1,612+1.6k

Biggest sellers

FMR LLC Reduced -21,671-21.7k
SOUTHEASTERN ASSET MANAGEMENT INC/TN/ Reduced -11,316-11.3k
Brookfield Corp /ON/ Sold out -8,687-8.7k
Boston Partners Reduced -7,532-7.5k
SCOUT INVESTMENTS, INC. Reduced -6,853-6.9k
River Road Asset Management, LLC Reduced -5,733-5.7k
Brandywine Global Investment Management, LLC Reduced -5,209-5.2k
STRS OHIO Reduced -5,060-5.1k
RAYMOND JAMES & ASSOCIATES Reduced -4,510-4.5k
VANGUARD GROUP INC Reduced -4,362-4.4k

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 2023

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 21: 0 buyingQ3 21: 0 sellingQ4 21: 0 buyingQ4 21: 0 sellingQ4 21Q1 22: 0 buyingQ1 22: 0 sellingQ2 22: 0 buyingQ2 22: 1 sellingQ2 22Q3 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 23
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q3 20210—0——
Q4 20210—0——
Q1 20220—0——
Q2 20220—1$127.1k—
Q3 20220—2$1.6m—
Q4 20220—1$137.2k—
Q1 20230—0——
Q2 20230—0——

None reported in Q2 2023.

Holders, Q2 2023

#ManagerLocationShares Value% of their portfolioChangeShares change
1 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 253,615253.6k $352.2m $352.2m 0.01% Reduced -4.4k -4,362
2 MORGAN STANLEY 0.03% of their portfolio NEW YORK, NY 202,009202.0k $280.6m $280.6m 0.03% Added +1.1k +1,110
3 DIMENSIONAL FUND ADVISORS LP 0.07% of their portfolio AUSTIN, TX 158,625158.6k $220.3m $220.3m 0.07% Reduced -1.3k -1,313
4 FULLER & THALER ASSET MANAGEMENT, INC. 1.11% of their portfolio SAN MATEO, CA 140,277140.3k $194.8m $194.8m 1.11% Reduced -3.5k -3,461
5 River Road Asset Management, LLC 2.55% of their portfolio LOUISVILLE, KY 132,956133.0k $184.7m $184.7m 2.55% Reduced -5.7k -5,733
6 Boston Partners 0.22% of their portfolio BOSTON, MA 118,005118.0k $165.3m $165.3m 0.22% Reduced -7.5k -7,532
7 BlackRock Inc. 0.00% of their portfolio New York, NY 111,759111.8k $155.2m $155.2m 0.00% Added +227 +227
8 Wallace Capital Management Inc. 17.47% of their portfolio DALLAS, TX 81,48581.5k $113.2m $113.2m 17.47% Added +8.4k +8,357
9 WELLINGTON MANAGEMENT GROUP LLP 0.02% of their portfolio Boston, MA 79,63579.6k $110.6m $110.6m 0.02% Added +8.9k +8,911
10 LONDON CO OF VIRGINIA 0.51% of their portfolio RICHMOND, VA 65,30165.3k $90.7m $90.7m 0.51% Added +267 +267
11 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 47,62947.6k $66.2m $66.2m 0.00% Reduced -244 -244
12 LORD, ABBETT & CO. LLC 0.11% of their portfolio JERSEY CITY, NJ 47,31847.3k $65.7m $65.7m 0.11% New
13 SOUTHEASTERN ASSET MANAGEMENT INC/TN/ 2.07% of their portfolio MEMPHIS, TN 42,21742.2k $58.6m $58.6m 2.07% Reduced -11.3k -11,316
14 BANK OF AMERICA CORP /DE/ 0.01% of their portfolio CHARLOTTE, NC 41,89741.9k $58.2m $58.2m 0.01% Reduced -490 -490
15 REINHART PARTNERS, LLC. 2.82% of their portfolio MEQUON, WI 40,12640.1k $55.7m $55.7m 2.82% Added +7 +7
16 FIDUCIARY MANAGEMENT INC /WI/ 0.51% of their portfolio MILWAUKEE, WI 36,49636.5k $50.7m $50.7m 0.51% Added +2.1k +2,072
17 GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio BOSTON, MA 36,18036.2k $50.3m $50.3m 0.01% Added +957 +957
18 Cannell & Co. 1.47% of their portfolio New York, NY 31,89931.9k $44.3m $44.3m 1.47% Reduced -1.3k -1,341
19 Robeco Institutional Asset Management B.V. 0.12% of their portfolio ROTTERDAM, P7 31,67831.7k $44.0m $44.0m 0.12% Reduced -489 -489
20 NORGES BANK 0.01% of their portfolio OSLO, Q8 27,04227.0k $37.6m $37.6m 0.01% Added +661 +661
21 RAYMOND JAMES & ASSOCIATES 0.03% of their portfolio ST PETERSBURG, FL 24,67624.7k $34.3m $34.3m 0.03% Reduced -4.5k -4,510
22 SCOUT INVESTMENTS, INC. 0.78% of their portfolio KANSAS CITY, MO 23,75823.8k $38.2m $38.2m 0.78% Reduced -6.9k -6,853
23 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio SAN FRANCISCO, CA 23,11323.1k $32.1m $32.1m 0.01% Reduced -27 -27
24 FMR LLC 0.00% of their portfolio BOSTON, MA 22,55122.6k $31.3m $31.3m 0.00% Reduced -21.7k -21,671
25 Mraz, Amerine & Associates, Inc. 7.31% of their portfolio Modesto, CA 22,39822.4k $31.1m $31.1m 7.31% Added +36 +36
26 ELKHORN PARTNERS LIMITED PARTNERSHIP 16.04% of their portfolio OMAHA, NE 18,08518.1k $25.1m $25.1m 16.04% Added +65 +65
27 THOMPSON SIEGEL & WALMSLEY LLC 0.39% of their portfolio RICHMOND, VA 17,41017.4k $24.2m $24.2m 0.39% Reduced -7 -7
28 VICTORY CAPITAL MANAGEMENT INC 0.02% of their portfolio San Antonio, TX 15,54115.5k $21.6m $21.6m 0.02% Reduced -556 -556
29 Perpetual Ltd 0.18% of their portfolio SYDNEY, NEW SOUTH WALES, C3 15,47615.5k $21.5m $21.5m 0.18% Unchanged
30 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 15,41015.4k $21.4m $21.4m 0.00% Added +289 +289
31 WELLS FARGO & COMPANY/MN 0.01% of their portfolio SAN FRANCISCO, CA 13,91013.9k $19.3m $19.3m 0.01% Reduced -571 -571
32 California Public Employees Retirement System 0.02% of their portfolio Sacramento, CA 13,88213.9k $19.3m $19.3m 0.02% Added +7 +7
33 SPEECE THORSON CAPITAL GROUP INC 3.68% of their portfolio MINNETONKA, MN 12,93012.9k $18.0m $18.0m 3.68% Reduced -165 -165
34 ROYCE & ASSOCIATES LP 0.17% of their portfolio New York, NY 12,53612.5k $17.4m $17.4m 0.17% Reduced -1.1k -1,120
35 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 11,47811.5k $15.9m $15.9m 0.00% Reduced -316 -316
36 Cove Street Capital, LLC 4.39% of their portfolio El Segundo, CA 10,17610.2k $14.1m $14.1m 4.39% Reduced -769 -769
37 T. Rowe Price Investment Management, Inc. 0.01% of their portfolio BALTIMORE, MD 9,6529.7k $13.4m $13.4m 0.01% New
38 BROWN ADVISORY INC 0.02% of their portfolio BALTIMORE, MD 9,4499.4k $13.1m $13.1m 0.02% Reduced -623 -623
39 AQR CAPITAL MANAGEMENT LLC 0.03% of their portfolio Greenwich, CT 9,2639.3k $12.8m $12.8m 0.03% Added +2.6k +2,566
40 FEDERATED HERMES, INC. 0.03% of their portfolio PITTSBURGH, PA 8,8008.8k $12.2m $12.2m 0.03% Reduced -122 -122
41 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 8,2778.3k $11.5m $11.5m 0.00% Reduced -947 -947
42 AMERICAN CENTURY COMPANIES INC 0.01% of their portfolio KANSAS CITY, MO 7,3497.3k $10.2m $10.2m 0.01% Added +1.4k +1,396
43 ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio Berwyn, PA 7,2087.2k $10.0m $10.0m 0.00% Added +186 +186
44 EAGLE ASSET MANAGEMENT INC 0.06% of their portfolio ST PETERSBURG, FL 7,1227.1k $9.9m $9.9m 0.06% Added +547 +547
45 GW&K Investment Management, LLC 0.08% of their portfolio BOSTON, MA 6,0246.0k $8.4m $8.4m 0.08% Added +218 +218
46 HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC 0.03% of their portfolio Los Angeles, CA 5,7965.8k $8.1m $8.1m 0.03% Added +253 +253
47 Swiss National Bank 0.01% of their portfolio ZURICH, V8 5,5465.5k $7.7m $7.7m 0.01% Unchanged
48 Williams Jones Wealth Management, LLC. 0.11% of their portfolio NEW YORK, NY 5,3435.3k $7.4m $7.4m 0.11% Unchanged
49 Alaska Permanent Fund Corp 0.14% of their portfolio JUNEAU, AK 5,2185.2k $7.2m $7.2m 0.14% First filing
50 Brandywine Global Investment Management, LLC 0.06% of their portfolio PHILADELPHIA, PA 5,2095.2k $7.2m $7.2m 0.06% Reduced -5.2k -5,209
51 Phocas Financial Corp. 0.95% of their portfolio ALAMEDA, CA 5,0225.0k $7.0m $7.0m 0.95% Reduced -35 -35
52 Legal & General Group Plc 0.00% of their portfolio London, X0 4,9124.9k $6.8m $6.8m 0.00% Reduced -41 -41
53 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 4,6994.7k $6.5m $6.5m 0.00% Unchanged
54 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 4,6864.7k $6.5m $6.5m 0.00% Reduced -171 -171
55 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio TALLAHASSEE, FL 4,6824.7k $6.5m $6.5m 0.01% Added +1.6k +1,612
56 RHUMBLINE ADVISERS 0.01% of their portfolio BOSTON, MA 4,6534.7k $6.5m $6.5m 0.01% Added +261 +261
57 D. E. Shaw & Co., Inc. 0.01% of their portfolio New York, NY 4,6064.6k $6.4m $6.4m 0.01% Reduced -400 -400
58 CREDIT SUISSE AG/ 0.01% of their portfolio ZURICH, V8 4,3954.4k $6.1m $6.1m 0.01% Added +420 +420
59 LAZARD ASSET MANAGEMENT LLC 0.01% of their portfolio NEW YORK, NY 4,3924.4k $6.1m $6.1m 0.01% Reduced -1.5k -1,534
60 FRANKLIN RESOURCES INC 0.00% of their portfolio San Mateo, CA 4,1434.1k $5.8m $5.8m 0.00% New
61 LEE DANNER & BASS INC 0.44% of their portfolio NASHVILLE, TN 3,6833.7k $5.1m $5.1m 0.44% Unchanged
62 NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio ALBANY, NY 3,5823.6k $5.0m $5.0m 0.01% Added +20 +20
63 MARTINGALE ASSET MANAGEMENT L P 0.10% of their portfolio BOSTON, MA 3,5673.6k $5.0m $5.0m 0.10% Reduced -244 -244
64 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 3,4363.4k $4.8m $4.8m 0.00% Reduced -185 -185
65 PROSPECTOR PARTNERS LLC 0.63% of their portfolio GUILFORD, CT 3,2273.2k $4.5m $4.5m 0.63% Added +970 +970
66 Qube Research & Technologies Ltd 0.02% of their portfolio LONDON, X0 3,1493.1k $4.4m $4.4m 0.02% Added +698 +698
67 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 3,0903.1k $4.3m $4.3m 0.01% Reduced -109 -109
68 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 3,0773.1k $4.3m $4.3m 0.00% Added +1.8k +1,819
69 Allianz Asset Management GmbH 0.01% of their portfolio MUNICH, 2M 2,8362.8k $3.9m $3.9m 0.01% Reduced -399 -399
70 RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio NEW YORK, NY 2,8002.8k $3.9m $3.9m 0.01% Added +1.1k +1,100
71 AGF MANAGEMENT LTD 0.03% of their portfolio TORONTO, A6 2,5832.6k $3.6m $3.6m 0.03% Reduced -32 -32
72 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 2,5722.6k $3.6m $3.6m 0.00% Added +178 +178
73 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 2,4202.4k $3.4m $3.4m 0.00% Added +64 +64
74 DAVENPORT & Co LLC 0.02% of their portfolio RICHMOND, VA 2,2382.2k $3.1m $3.1m 0.02% Added +6 +6
75 STRS OHIO 0.01% of their portfolio COLUMBUS, OH 2,1432.1k $3.0m $3.0m 0.01% Reduced -5.1k -5,060
76 TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY 0.03% of their portfolio FRANKFORT, KY 2,0832.1k $2.9m $2.9m 0.03% Unchanged
77 Creative Planning 0.00% of their portfolio OVERLAND PARK, KS 2,0042.0k $2.8m $2.8m 0.00% Added +63 +63
78 DEAN INVESTMENT ASSOCIATES, LLC 0.42% of their portfolio BEAVERCREEK, OH 1,8431.8k $2.6m $2.6m 0.42% Added +1.2k +1,199
79 State of New Jersey Common Pension Fund D 0.01% of their portfolio TRENTON, NJ 1,8271.8k $2.5m $2.5m 0.01% Unchanged
80 SEI INVESTMENTS CO 0.00% of their portfolio OAKS, PA 1,7591.8k $2.4m $2.4m 0.00% Reduced -16 -16
81 Man Group plc 0.01% of their portfolio LONDON, X0 1,7561.8k $2.4m $2.4m 0.01% New
82 STIFEL FINANCIAL CORP 0.00% of their portfolio ST. LOUIS, MO 1,7551.8k $2.4m $2.4m 0.00% Reduced -44 -44
83 Cerity Partners LLC 0.01% of their portfolio NEW YORK, NY 1,7281.7k $2.4m $2.4m 0.01% Added +147 +147
84 Triad Investment Management 3.34% of their portfolio NEWPORT BEACH, CA 1,7261.7k $2.4m $2.4m 3.34% Reduced -3 -3
85 OPPENHEIMER ASSET MANAGEMENT INC. 0.04% of their portfolio NEW YORK, NY 1,7221.7k $2.4m $2.4m 0.04% Reduced -10 -10
86 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 1,6571.7k $2.3m $2.3m 0.00% Added +8 +8
87 PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio BALTIMORE, MD 1,2861.3k $1.8m $1.8m 0.00% Reduced -8 -8
88 JANUS HENDERSON GROUP PLC 0.00% of their portfolio LONDON, X0 1,2381.2k $1.7m $1.7m 0.00% Reduced -1 -1
89 TRUIST FINANCIAL CORP 0.00% of their portfolio CHARLOTTE, NC 1,2191.2k $1.7m $1.7m 0.00% Reduced -34 -34
90 PECAUT & CO. 0.69% of their portfolio SIOUX CITY, IA 1,1791.2k $1.6m $1.6m 0.69% Unchanged
91 1834 INVESTMENT ADVISORS CO 0.19% of their portfolio Milwaukee, WI 1,1761.2k $1.6m $1.6m 0.19% Unchanged
92 UBS Group AG 0.00% of their portfolio ZURICH, V8 1,1721.2k $1.6m $1.6m 0.00% Reduced -738 -738
93 PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO 0.01% of their portfolio COLUMBUS, OH 1,1621.2k $1.6m $1.6m 0.01% Reduced -123 -123
94 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 1,1401.1k $1.6m $1.6m 0.00% Added +38 +38
95 NISA INVESTMENT ADVISORS, LLC 0.01% of their portfolio ST. LOUIS, MO 1,1001.1k $1.5m $1.5m 0.01% Unchanged
96 Corient Private Wealth LP 0.00% of their portfolio MIAMI, FL 1,0971.1k $1.5m $1.5m 0.00% Added +774 +774
97 Forum Financial Management, LP 0.03% of their portfolio LOMBARD, IL 1,0921.1k $1.5m $1.5m 0.03% Added +89 +89
98 Treasurer of the State of North Carolina 0.01% of their portfolio RALEIGH, NC 1,0851.1k $1.5m $1.5m 0.01% Reduced -10 -10
99 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 1,0811.1k $1.5m $1.5m 0.00% Added +360 +360
100 Autumn Glory Partners, LLC 1.10% of their portfolio DALLAS, TX 1,0801.1k $1.5m $1.5m 1.10% Reduced -960 -960