Mattern Capital Management, LLC

SEC CIK: 0001803227
Latest filing: Jul 24, 2026

SEC filings (opens in a new tab)

WRB holding history

Berkley W R Corp in every 13F filed by Mattern Capital Management, LLC, including the quarters it was sold out or no filing was made. Changes compare share counts with the previous calendar quarter.

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

Shares (Q2 2026): 126,077
Value: $8.89M
% of portfolio: 1.0%
Quarters held: 6; Since Q1 2025

Holdings of WRB by Mattern Capital Management, LLC, by quarter
Quarter	Shares	Value	% of portfolio	Share change	Action	All holders
Q2 2026	126,077	$8.89M	1.0%	+13,205+11.7%	Added	Holders
Q1 2026	112,872	$7.48M	0.9%	+6,013+5.6%	Added	Holders
Q4 2025	106,859	$7.49M	0.9%	+5,258+5.2%	Added	Holders
Q3 2025	101,601	$7.78M	0.9%	+20,381+25.1%	Added	Holders
Q2 2025	81,220	$5.97M	0.7%	+7,630+10.4%	Added	Holders
Q1 2025	73,590	$5.24M	0.7%	+73,590	New	Holders