– Aquamarine Zurich AG Portfolio Activity & Recent Trades (Sep 30, 2025)

As of Sep 30, 2025, the Aquamarine Zurich AG portfolio activity showed several notable changes in holdings, according to the latest SEC 13F filing reported on Oct 20, 2025. The activity included new positions, additions to existing holdings, reductions, and complete exits, providing a clear view of how the portfolio evolved during the quarter.

During Q3 2025, the filing reported:

New Buys –

None reported

Increases – Core Natural Resources

Reductions – Micron Technology, Inc.

Complete Exits –

None reported

These updates highlight how the portfolio adjusted across different sectors and market conditions, offering insights into allocation shifts and investment trends.

Date	Symbol	Name	Type	Change Qty	% Change	Value	Remaining
Q3 2025	CEIX Core Natural Resources	Core Natural Resources	Buy	+2,640	+32.6%	$897.00	10,740
Q3 2025	MU Micron Technology, Inc.	Micron Technology, Inc.	Sell	-120,000	-60.0%	$13.39K	80,000
Q1 2025	ARCH Arch Resources, Inc.	Arch Resources, Inc.	Sell - Position Exit	-8,100	-100.0%	$0.00	-
Q1 2025	CEIX Core Natural Resources	Core Natural Resources	Buy - Position Entry	+8,100	-	$828.00	8,100
Q2 2024	AMR Alpha Metallurgical Resources,	Alpha Metallurgical Resources,	Buy - Position Entry	+8,000	-	$2.24K	8,000
Q2 2024	ARCH Arch Resources, Inc.	Arch Resources, Inc.	Buy - Position Entry	+8,100	-	$1.23K	8,100
Q1 2024	RACE Ferrari	Ferrari	Sell	-20,000	-25.0%	$26.16K	60,000
Q4 2022	GOOGL Alphabet Inc.	Alphabet Inc.	Buy	+15,200	+1900.0%	$1.41K	16,000
Q3 2022	AXP American Express Company	American Express Company	Buy - Position Entry	+210,000	-	$28.33K	210,000
Q3 2022	BABA Alibaba Group Holding Limited	Alibaba Group Holding Limited	Buy - Position Entry	+47,500	-	$3.80K	47,500
Q3 2022	BAC Bank of America Corporation	Bank of America Corporation	Buy - Position Entry	+767,845	-	$23.19K	767,845
Q3 2022	BRK-A Berkshire Hathaway Inc.	Berkshire Hathaway Inc.	Buy - Position Entry	+30	-	$12.19K	30
Q3 2022	BRK-B Berkshire Hathaway Inc. New	Berkshire Hathaway Inc. New	Buy - Position Entry	+140,600	-	$37.54K	140,600
Q3 2022	DJCO Daily Journal Corp. (S.C.)	Daily Journal Corp. (S.C.)	Buy - Position Entry	+11,500	-	$2.95K	11,500
Q3 2022	GOOGL Alphabet Inc.	Alphabet Inc.	Buy - Position Entry	+800	-	$1.53K	800
Q3 2022	MA Mastercard Incorporated	Mastercard Incorporated	Buy - Position Entry	+65,750	-	$18.70K	65,750
Q3 2022	MCO Moody's Corporation	Moody's Corporation	Buy - Position Entry	+27,000	-	$6.56K	27,000
Q3 2022	MU Micron Technology, Inc.	Micron Technology, Inc.	Buy - Position Entry	+200,000	-	$10.02K	200,000
Q3 2022	RACE Ferrari	Ferrari	Buy - Position Entry	+80,000	-	$15.03K	80,000
Q3 2022	SRG Seritage Growth Properties	Seritage Growth Properties	Buy - Position Entry	+500,000	-	$4.51K	500,000