Mastercard Inc (MA) is 15.29% of Guy Spier's Aquamarine Capital portfolio as of September 30, 2026, according to the 13F-HR filed with the SEC on November 10, 2026: 40K shares worth about $22.1M, the 3rd largest of 7 stock positions. Guy Spier left the share count unchanged from the prior quarter.
What did the 2026 Q3 filing report for MA?
As of September 30, 2026, from the 13F-HR filed November 10, 2026.
| Value | |
|---|---|
| Portfolio weight | 15.29% |
| Shares | 40K |
| Reported value | $22.1M |
| Rank in portfolio | 3rd of 7 |
| Largest holding | BRK-B at 33.66% |
| Top three holdings | 64.49% of the book |
| Change this quarter | unchanged |
How concentrated is Guy Spier in MA?
MA at 15.29% is 1.1 times the average stock position in the Guy Spier portfolio, which is 14%. The largest holding is BRK-B at 33.66%. The three largest stocks together are 64.49% of the reported book. A quarter earlier MA was 14.26% of the book.
Where does MA sit in the Guy Spier portfolio?
MA ranks 3rd of 7 stock positions in the Guy Spier portfolio at 15.29%, about the fund's average stock position of 14%. Across the 2026 Q3 portfolio, Guy Spier reported 7 stock positions, with no position opened or closed. The total portfolio value is about $144M, little changed from the prior quarter.
How long has Guy Spier held MA?
Guy Spier first reported MA in the quarter ended December 31, 2014. The weight peaked at 15.48% in 2025 Q4. The share count was unchanged the quarter before. Every reported trade is on the Guy Spier MA trade history page.
Did other funds buy or sell MA in 2026 Q3?
Among the other tracked funds that had filed for 2026 Q3 as of November 10, 2026, 4 hold MA. The largest buyers of MA this quarter were Lewis Sanders and Donald Yacktman. The largest sellers were Vulcan Value Partners and John Armitage. Every tracked holder of MA is on the MA ownership page.
FAQ
What share of the Guy Spier portfolio is MA?
MA is 15.29% of the Guy Spier portfolio as of 2026 Q3, the 3rd largest of 7 stock positions.
What is the MA stake of Guy Spier worth?
Guy Spier holds 40K shares of MA, worth about $22.1M at September 30, 2026 prices, 15.29% of the reported portfolio.
What are the largest holdings of Guy Spier?
The largest stock positions of Guy Spier as of 2026 Q3 are BRK-B (33.66%), BRK-A (15.53%) and MA (15.29%), together 64.49% of the book.
Did Guy Spier's Aquamarine Capital change its MA position in 2026 Q3?
Guy Spier left the share count unchanged from the prior quarter.