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Guy Spier / Aquamarine

⭐ Priority · cloneable · 31-DEC-2025 → 31-MAR-2026

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

13FScore 67/100 — cloning their disclosed top holdings over ~3.7y returned +20%/yr vs S&P +19%/yr (alpha +1%/yr), ahead of the market in 67% of quarters. Cloneable 13F equity book only — excludes hedges/shorts/non-US.

New positions

Issuer% bookValueSince entryConvictionBusinessTags
none

Added to (≥+25% shares)

Issuer% bookΔ sharesSince addConvictionBusinessTags
none

Top holdings now

Issuer% bookSince entryBusinessTags
$BRK.B · BERKSHIRE HATHAWAY INC DEL34.6%+87% Q3 '22Berkshire Hathaway is a diversified holding company led by Warren Buffett, owning insurance, railroad, energy, and manufacturing businesses alongside a large portfolio of public equities.S&PBitget →
$BRK.A · BERKSHIRE HATHAWAY INC DEL15.9%+83% Q3 '22Berkshire Hathaway is a diversified holding company led by Warren Buffett, owning insurance, railroad, energy, and manufacturing businesses alongside a large portfolio of public equities.
$MA · MASTERCARD INCORPORATED14.8%+91% Q3 '22Mastercard operates a global payments technology network that processes electronic transactions between financial institutions, merchants, cardholders, and businesses, and provides related value-added services.S&P
$AXP · AMERICAN EXPRESS CO14.5%+163% Q3 '22American Express is a global payments company that issues credit and charge cards, operates a card network, and provides lending, merchant, and travel services.S&P
$DUT · MOODYS CORP8.7%Moody's provides credit ratings, research, and risk analytics, operating Moody's Investors Service for debt ratings and Moody's Analytics for financial data, software, and risk-assessment tools.
$RACE · FERRARI N V7.4%+99% Q3 '22Ferrari designs, manufactures, and sells luxury high-performance sports cars and related merchandise, and competes in Formula One racing.
$DJCO · DAILY JOURNAL CORP4.1%+131% Q3 '22Legal publisher and software (Munger-chaired)NASDAQ

Since entry / add = price change to the latest close (31-MAR-2026 book marked to market). Top holdings measure from the quarter-end when the name first entered the filer's disclosed top holdings (tagged e.g. Q1 '26); new & added positions measure from this quarter's quarter-end. Based on disclosed 13F snapshots — an approximation of entry, not the manager's actual cost basis. Generated 2026-07-20 · Alpha-Investor tracker