Aquamarine Capital

Guy Spier ⓘ

$144.1M Portfolio Value

7 Stocks

+1.05% YTD Return ⓘ

Jul 10, 2026 Last Updated

Portfolio Value Over Time

Stock Click to search	Shares	Value	% of Portfolio	Change	Est. Return ⓘ
BRK-B\|Berkshire Hathaway Inc	97.6K	$48.8M	33.89%	—	—
BRK-A\|Berkshire Hathaway Inc	30	$22.5M	15.59%	—	—
AXP\|American Express Co	65.0K	$22.0M	15.26%	—	—
MA\|Mastercard Incorporated	40.0K	$20.5M	14.26%	—	—
MCO\|Moodys Corp	27.0K	$12.2M	8.49%	—	—
RACE\|Ferrari N V	30.0K	$11.1M	7.71%	—	—
DJCO\|Daily Journal Corp	11.5K	$6.9M	4.80%	—	—

13F Filing:

Stock Click to search	Action	Change	Shares After	Value	Est. Return ⓘ
2026-Q2
No position changes reported in this filing.
2026-Q1
No position changes reported in this filing.
2025-Q4
BRK-B\|Berkshire Hathaway Inc	SELL	-30.58%	97.6K	$49M	—
AXP\|American Express Co	SELL	-69.05%	65.0K	$24M	—
BAC\|Bank America Corp	SELL	EXIT	—	—	—
MA\|Mastercard Incorporated	SELL	-39.16%	40.0K	$23M	—
RACE\|Ferrari N V	SELL	-50.00%	30.0K	$10M	—
MU\|Micron Technology Inc	SELL	EXIT	—	—	—
BABA\|Alibaba Group Hldg Ltd	SELL	EXIT	—	—	—
GOOGL\|Alphabet Inc	SELL	EXIT	—	—	—
SRG\|Seritage Growth Pptys	SELL	EXIT	—	—	—
AMR\|Alpha Metallurgical Resour I	SELL	EXIT	—	—	-45.6%
CNR\|Core Natural Resources Inc	SELL	EXIT	—	—	+2.8%
2025-Q3
MU\|Micron Technology Inc	SELL	-60.00%	80.0K	$13M	—
2025-Q2
No position changes reported in this filing.
2025-Q1
ARCH1USD\|Arch Resources Inc	SELL	EXIT	—	—	—
CNR\|Core Natural Resources Inc	BUY	NEW	10.7K	$828000	+8.2%
2024-Q4
No position changes reported in this filing.
2024-Q3
No position changes reported in this filing.
2024-Q2
AMR\|Alpha Metallurgical Resour I	BUY	NEW	8.0K	$2M	-41.1%
ARCH1USD\|Arch Resources Inc	BUY	NEW	8.1K	$1M	—
2024-Q1
RACE\|Ferrari N V	SELL	-25.00%	60.0K	$26M	—
2023-Q4
No position changes reported in this filing.
2023-Q3
No position changes reported in this filing.
2023-Q2
No position changes reported in this filing.
2023-Q1
No position changes reported in this filing.
2022-Q4
No position changes reported in this filing.

Stock Click to search	Held Period	Cost Basis	Sale Proceeds	Realized Gain	Return ⓘ	CAGR ⓘ
AMR\|Alpha Metallurgical Resour I	2024-Q2 → 2025-Q4 (1.5y)	$2.5M	$1.3M	$-1.1M	-45.6%	-33.4%
CNR\|Core Natural Resources Inc	2025-Q1 → 2025-Q4 (0.7y)	$878.4K	$902.6K	$+24.2K	+2.8%	+3.7%

Current Holdings for Aquamarine Capital