Boston Partners

SEC CIK: 0001386060
Latest filing: Aug 4, 2026

SEC filings (opens in a new tab)

WTM holding history

White Mountains Insurance Group Ltd in every 13F filed by Boston Partners, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

WTM overview All 13F holders of WTM Full Q2 2026 holdings

Shares (Q2 2026): 55,569
Value: $115.3M
% of portfolio: 0.1%
Quarters held: 22; Since Q1 2021

Holdings of WTM by Boston Partners, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	55,569	$115.3M	0.1%	−1,890−3.3%	Reduced	Holders
Q1 2026	57,459	$126.2M	0.1%	−19,452−25.3%	Reduced	Holders
Q4 2025	76,911	$159.7M	0.2%	−7,534−8.9%	Reduced	Holders
Q3 2025	84,445	$142.5M	0.1%	−4,949−5.5%	Reduced	Holders
Q2 2025	89,394	$160.5M	0.2%	+4,158+4.9%	Added	Holders
Q1 2025	85,236	$163.3M	0.2%	−209−0.2%	Reduced	Holders
Q4 2024	85,445	$165.8M	0.2%	+348+0.4%	Added	Holders
Q3 2024	85,097	$145.0M	0.2%	−2,574−2.9%	Reduced	Holders
Q2 2024	87,671	$158.9M	0.2%	−2,923−3.2%	Reduced	Holders
Q1 2024	90,594	$162.4M	0.2%	−1,958−2.1%	Reduced	Holders
Q4 2023	92,552	$140.0M	0.2%	−21,947−19.2%	Reduced	Holders
Q3 2023	114,499	$170.7M	0.2%	−3,506−3.0%	Reduced	Holders
Q2 2023	118,005	$165.3M	0.2%	−7,532−6.0%	Reduced	Holders
Q1 2023	125,537	$173.6M	0.2%	+1,217+1.0%	Added	Holders
Q4 2022	124,320	$176.5M	0.2%	−3,692−2.9%	Reduced	Holders
Q3 2022	128,012	$167.7M	0.2%	−5,203−3.9%	Reduced	Holders
Q2 2022	133,215	$166.1M	0.2%	−2,193−1.6%	Reduced	Holders
Q1 2022	135,408	$153.7M	0.2%	−2,428−1.8%	Reduced	Holders
Q4 2021	137,836	$139.8M	0.2%	−5,996−4.2%	Reduced	Holders
Q3 2021	143,832	$154.0M	0.2%	+3,373+2.4%	Added	Holders
Q2 2021	140,459	$161.4M	0.2%	+3,264+2.4%	Added	Holders
Q1 2021	137,195	$153.6M	0.2%	–	–	Holders

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.