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ROCKWOOD RESEARCH · A CORPORATE FILINGS WEBSITE|STRAIGHT FROM THE SOURCE · SEC EDGAR|SPONSOREDYour message on this tape — bid on the Rockwood Ad Exchange · Rockwood Ad Exchange|
Rockwood Research
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Punch Card Management

Long Only
Manager
Norbert Lou
Quarter
Q2 2026
13F value
$256.0M
Positions
5
CIK
0001631664
SHARE:XLINKEDINEMAIL
Berkshire Hathaway Inc DelBRK-AHISTORY42.42%—
Crocs IncCROXHISTORY27.20%(2.9%)
PDD Holdings IncPDDHISTORY12.37%—
PayPal Hldgs IncPYPLHISTORY10.61%—
iShares TRSGOVHISTORY7.39%(59.1%)
Positions are from the latest 13F-HR (period end 2026-06-30). Weights are calculated: position value ÷ the 13F book. Schedule 13D/13G stakes are merged in when present (shares and percent of class, no dollar value). Chg Shares and % Chg compare with the adjacent prior quarter's 13F only. % Out is either calculated (position shares ÷ issuer shares outstanding from the issuer's XBRL cover page; weighted-average basic shares as a fallback) or reported (percent of class on a Schedule 13D/13G newer than the 13F period) — hover a value for its source and date. Unavailable figures show “—”, never an estimate. Methodology