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Guy Spier recent buys & sells (2026 Q3)

Aquamarine Capital

Aquamarine Capital Portfolio Changes

Purchase & sale details

Portfolio value:
$144.26M (+$173K)
Previous value:
$144.09M
# of changes:
0
New positions:
0
Reported for:
30 Sep 2026 (Q3)
Latest filing date:
10 Nov 2026
Aquamarine Capital has not disclosed any changes to the portfolio in the latest (2026 Q3) SEC report(s).

What stocks is Guy Spier buying now?

In the recent quarter Guy Spier has not purchased any securities.

What does Guy Spier invest in?

Guy Spier's top 5 holdings (by % of portfolio) are (BRK-B) Berkshire Hathaway Inc (33.66%), (BRK-A) Berkshire Hathaway Inc (15.53%), (MA) Mastercard Inc (15.29%), (AXP) American Express Company (13.70%) and (MCO) Moodys Corp (8.50%).
In the latest report(s) no changes have been made to any of these investments.
No results
History Ticker Name % or
activity 		Shares
change 		Shares
held after* 		% change
to portfolio 		Reported
price* 		% difference
current price* 		% of
portfolio 		Held since* Held for*

No changed positions

Insights | News

All 26/Q3 insights
Insight
BRK-B is 33.66% of Guy Spier's portfolio as of 2026 Q3.
—
Outsized position · 2026 Q3
Insight
MA is 15.29% of Guy Spier's portfolio as of 2026 Q3.
—
Outsized position · 2026 Q3
Insight
BRK-A is 15.53% of Guy Spier's portfolio as of 2026 Q3.
—
Outsized position · 2026 Q3
Insight
AXP is 13.7% of Guy Spier's portfolio as of 2026 Q3.
—
Outsized position · 2026 Q3
* Shares, change to shares, sold shares, shares held after: split-adjusted.
* Reported price: this doesn't represent the actual buy or sell price. It is the split-adjusted price of the security as of the last day of the reported period.
* Current price: this can be a delayed price and may not reflect the real-time market value, however it is too close.
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* Held since / Held for: calculated since the latest "new buy" position. If the security was previously exited and re-entered, only the most recent holding period is counted. 2013 Q2 is the earliest period we have data for, so "2013 Q2*" means "2013 Q2 or earlier".