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Built from publicly disclosed institutional and insider activity. Informational purposes only - not investment advice.OpenStocks · v0.1
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  1. Home/
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  3. Guy Spier (Aquamarine Zurich)
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  • Portfolio7
  • Performance8Q
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Guy Spier

Aquamarine Zurich
Share
  • Hedge Fund · CIK 0001953324
  • Financials-Focused
  • Highly Concentrated
  • Boutique

Guy Spier runs Aquamarine Zurich, a hedge fund overseeing $135K in disclosed equity holdings (SEC CIK 0001953324). The latest portfolio (2026Q1) discloses 7 positions across 2 sectors, with the largest positions in BRK.B, BRK.A and MA. On a mark-to-market basis the tracked portfolio has returned 53.6% since 2024Q2. OpenStocks tracks 8 consecutive quarterly snapshots for this manager — every position change, new entry, and exit is logged below.

Track Guy's filingsView holdings↓
Portfolio
$135.3K
Positions
7
Quarter
2026Q1
Filings tracked
8
Since filing+53.6%Full performance →
Quarter
2026Q12025Q42025Q32025Q22025Q12024Q42024Q32024Q2
Capital flow per quarter
BuysSellsNet
+$70M+$35M$0-$35M-$70M'24Q3'24Q4'25Q1'25Q2'25Q3'25Q4'26Q1
Latest · 2026Q1
$0
Lifetime buys
$828K
Lifetime sells
$91M

Recent transactions

Last 14 moves
SOLD
B
Guy Spier (Aquamarine Zurich) exited BABA
ALIBABA GROUP HLDG LTD
−47,500
~$178.74 · 2025Q4
2026-01-15
SOLD
A
Guy Spier (Aquamarine Zurich) exited AMR
ALPHA METALLURGICAL RESOUR I
−8,000
~$164.13 · 2025Q4
2026-01-15
SOLD
G
Guy Spier (Aquamarine Zurich) exited GOOGL
ALPHABET INC
−16,000
~$243.13 · 2025Q4
2026-01-15
TRIM
A
Guy Spier (Aquamarine Zurich) trimmed AXP
AMERICAN EXPRESS CO
−145,000
~$0.37 · 2025Q4
2026-01-15
SOLD
M
Guy Spier (Aquamarine Zurich) exited MU
MICRON TECHNOLOGY INC
−80,000
~$167.32 · 2025Q4
2026-01-15
SOLD
S
Guy Spier (Aquamarine Zurich) exited SRG
SERITAGE GROWTH PPTYS
−500,000
~$4.25 · 2025Q4
2026-01-15
TRIM
N
Guy Spier (Aquamarine Zurich) trimmed N3167Y103
FERRARI N V
−30,000
~$0.32 · 2025Q4
2026-01-15
SOLD
B
Guy Spier (Aquamarine Zurich) exited BAC
BK OF AMERICA CORP
−767,845
~$51.59 · 2025Q4
2026-01-15
TRIM
B
Guy Spier (Aquamarine Zurich) trimmed BRK.B
BERKSHIRE HATHAWAY INC DEL
−43,000
~$0.50 · 2025Q4
2026-01-15
SOLD
C
Guy Spier (Aquamarine Zurich) exited CNR
CORE NATURAL RESOURCES INC
−10,740
~$83.52 · 2025Q4
2026-01-15
TRIM
M
Guy Spier (Aquamarine Zurich) trimmed MA
MASTERCARD INCORPORATED
−25,750
~$0.57 · 2025Q4
2026-01-15
TRIM
M
Guy Spier (Aquamarine Zurich) trimmed MU
MICRON TECHNOLOGY INC
−120,000
~$167.32 · 2025Q3
2025-10-20
SOLD
A
Guy Spier (Aquamarine Zurich) exited ARCH1USD
ARCH RESOURCES INC
−8,100
~$141.23 · 2025Q1
2025-07-18
NEW
C
Guy Spier (Aquamarine Zurich) opened a new position in CNR
CORE NATURAL RESOURCES INC
+10,740
~$77.09 · 2025Q1
2025-07-18