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Disclosery

Aquamarine Zurich AG

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13F filer, CIK 1953324, ZURICH, Switzerland

Aquamarine Zurich AG reported $309,842,000 across 14 holdings for the quarter ended 2025-06-30, in a 13F-HR/A filed 2025-07-18. Its ten largest share positions make up 98.06% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR/A 0001953324-25-000006

Period
2025-06-30
Reported value
$310M
Holdings
14
Top 10 weight
98.06%
New
0
Sold out
0

Holdings, Q2 2025

Share positions as resolved from 13F-HR/A 0001953324-25-000006, largest first. % of portfolio is the value over $309,842,000, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
BRK-BBERKSHIRE HATHAWAY INC DELQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 140,600 shares; 2024Q4: 140,600 shares; 2025Q1: 140,600 shares; 2025Q2: 140,600 shares 140,600$68.3M22.04%0Timeline
AXPAMERICAN EXPRESS COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 210,000 shares; 2024Q4: 210,000 shares; 2025Q1: 210,000 shares; 2025Q2: 210,000 shares 210,000$67M21.62%0Timeline
MAMASTERCARD INCORPORATEDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 65,750 shares; 2024Q4: 65,750 shares; 2025Q1: 65,750 shares; 2025Q2: 65,750 shares 65,750$36.9M11.92%0Timeline
BACBANK OF AMER CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 767,845 shares; 2024Q4: 767,845 shares; 2025Q1: 767,845 shares; 2025Q2: 767,845 shares 767,845$36.3M11.73%0Timeline
RACEFERRARI N VQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 60,000 shares; 2024Q4: 60,000 shares; 2025Q1: 60,000 shares; 2025Q2: 60,000 shares 60,000$25M8.06%0Timeline
MUMICRON TECHNOLOGY INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 200,000 shares; 2024Q4: 200,000 shares; 2025Q1: 200,000 shares; 2025Q2: 200,000 shares 200,000$24.6M7.96%0Timeline
BRK-ABERKSHIRE HATHAWAY INC DELQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 30 shares; 2024Q4: 30 shares; 2025Q1: 30 shares; 2025Q2: 30 shares 30$21.9M7.06%0Timeline
MCOMOODYS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 27,000 shares; 2024Q4: 27,000 shares; 2025Q1: 27,000 shares; 2025Q2: 27,000 shares 27,000$13.5M4.37%0Timeline
BABAALIBABA GROUP HLDG LTDQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 47,500 shares; 2024Q4: 47,500 shares; 2025Q1: 47,500 shares; 2025Q2: 47,500 shares 47,500$5.39M1.74%0Timeline
DJCODAILY JOURNAL CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 11,500 shares; 2024Q4: 11,500 shares; 2025Q1: 11,500 shares; 2025Q2: 11,500 shares 11,500$4.86M1.57%0Timeline
GOOGLALPHABET INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 16,000 shares; 2024Q4: 16,000 shares; 2025Q1: 16,000 shares; 2025Q2: 16,000 shares 16,000$2.82M0.91%0Timeline
SRGSERITAGE GROWTH PPTYSQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 500,000 shares; 2024Q4: 500,000 shares; 2025Q1: 500,000 shares; 2025Q2: 500,000 shares 500,000$1.54M0.5%0Timeline
AMRALPHA METALLURGICAL RESOUR IQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 8,000 shares; 2024Q4: 8,000 shares; 2025Q1: 8,000 shares; 2025Q2: 8,000 shares 8,000$900K0.29%0Timeline
CNRCORE NATURAL RESOURCES INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 10,740 shares; 2025Q2: 10,740 shares 10,740$749K0.24%0Timeline

How Q2 2025 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001953324-25-000004 superseded2025-07-16acceptance time not in the bulk data set
13F-HR/A 0001953324-25-000006 baserestatement2025-07-18acceptance time not in the bulk data set