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Guy Spier / Aquamarine

Tier 2 · PRIORITY · cloneable · 31-DEC-2025 → 31-MAR-2026

AUM $135,303 · 7 positions · top-10 100.0% · SEC filing history →

13FScore 63/100 — cloning their disclosed top holdings over ~3.6y returned +19%/yr vs S&P +19%/yr (alpha -0%/yr), ahead of the market in 60% of quarters. Cloneable 13F equity book only — excludes hedges/shorts/non-US.

New positions

Issuer	% book	Value	Conviction	Business
none

Added to (≥+25% shares)

Issuer	% book	Δ shares	Conviction	Business
none

Top holdings now

Issuer	% book	Business
$BRK.B · BERKSHIRE HATHAWAY INC DEL	34.6%	Buffett conglomerate — insurance, railroads, utilities, equities
$BRK.A · BERKSHIRE HATHAWAY INC DEL	15.9%	Buffett conglomerate — insurance, railroads, utilities, equities
$MA · MASTERCARD INCORPORATED	14.8%	Global card payment network
$AXP · AMERICAN EXPRESS CO	14.5%	Card payments, lending and travel services
$DUT · MOODYS CORP	8.7%	Credit ratings and financial-risk analytics
FERRARI N V	7.4%	Luxury sports car manufacturer
$DJCO · DAILY JOURNAL CORP	4.1%	Legal publisher and software (Munger-chaired)

Generated 2026-06-27 · Alpha-Investor tracker