American Express retired 2.0% of its shares in twelve months, so this stake grew 2.0% without buying a share.
Shares held, 8 quarters
Superinvestors › Guy Spier
Guy Spier’s cannibal stocks
Aquamarine Zurich · 13F for Q2 2026
3cannibals held
$55Kin these positions
Q2 2026latest 13F filing
Mastercard retired 3.9% of its shares in twelve months, so this stake grew 4.1% without buying a share.
Shares held, 8 quarters
Moody's retired 2.9% of its shares in twelve months, so this stake grew 3.0% without buying a share.
Shares held, 8 quarters
Values as reported in the 13F at quarter end. See the Q2 2026 filing on EDGAR.
Questions
Which cannibal stocks does Guy Spier own?
In the Q2 2026 13F, Aquamarine Zurich held AXP, MA, MCO. 3 of them are on the Buyback Radar leaderboard.
Where does this data come from?
From Aquamarine Zurich's 13F filings with the SEC, the last eight quarters, amendments applied, options excluded. A 13F shows US-listed stock positions at quarter end and is filed up to 45 days later, so it is a record, not a live portfolio.
How do buybacks help Guy Spier?
Mastercard retired 3.9% of its shares in the last twelve months. That alone made every remaining share, including Guy Spier's 40,000, 4.1% bigger as a slice of the company, without buying anything.
Guy Spier’s moves in companies like these are covered on Cannibal Stocks.
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