Guy Spier Holdings 13F: Latest Aquamarine Fund Portfolio Changes
Aquamarine Fund. Value investor, Education of a Value Investor author.
As of the latest Q1 2026 13F filing, Guy Spier (managing Aquamarine Fund) reported a public portfolio value of $135.3K with 7 positions. This page tracks latest holdings, latest 13F changes, top buys, top sells, and top holdings from the public filing.
Open interactive portfolioLatest 13F portfolio changes
Guy Spier holdings 13F summary: the latest Aquamarine Fund portfolio changes show top holdings including Berkshire Hathaway, BERKSHIRE HATHAWAY INC DEL, MASTERCARD INCORPORATED, AMERICAN EXPRESS, and MOODYS, reported top buys such as notable reported positions, and top sells or reductions such as notable reported positions.
Latest filing metadata: quarter Q1 2026; report date 2026-03-31; filing date 2026-04-17; disclosure source SEC 13F.
Guy Spier 13F portfolio and latest holdings overview
Guy Spier's Q1 2026 13F holdings show Aquamarine Fund reporting 7 positions with a disclosed portfolio value of $135.3K. For readers searching Guy Spier 13F holdings, Guy Spier portfolio, Aquamarine Fund holdings, or latest 13F changes, the latest top holdings include Berkshire Hathaway, BERKSHIRE HATHAWAY INC DEL, MASTERCARD INCORPORATED, AMERICAN EXPRESS, and MOODYS.
The three largest reported positions add up to roughly 65.3%, which helps readers judge portfolio concentration rather than just headline AUM. The largest reported sector exposure is Financials at 79.8% of the disclosed portfolio. This makes the page useful for comparing the manager's actual disclosed exposure with market narratives around the same names.
The latest change data highlights reported buys such as notable reported positions and reported reductions or exits such as notable reported positions. Those changes should be read as historical disclosure signals, not as real-time trade alerts.
The filing metadata lists report date 2026-03-31, filing date 2026-04-17, SEC accession 0001953324-26-000002. SEC 13F reports are normally published up to 45 days after quarter end, so the data is best used to understand institutional positioning after the fact rather than to infer today's exact portfolio.
Guy Spier portfolio analytics
the top five positions account for 88.5% of disclosed value; the largest sector exposure is Financials at 79.8%; reported buy and sell activity implies roughly 0.0% turnover this period; cost-basis P&L across 7 tracked positions averages 160.8% (5/5 currently in profit).
Top reported holdings
| Holding | Reported value | Weight | Quarter change |
|---|---|---|---|
| BRK.B whale holders BERKSHIRE HATHAWAY INC DEL | $46.8M | 34.6% | Held |
| BRK-A whale holders BERKSHIRE HATHAWAY INC DEL | $21.5M | 15.9% | Held |
| MA whale holders MASTERCARD INCORPORATED | $20.0M | 14.8% | Held |
| AXP whale holders AMERICAN EXPRESS CO | $19.7M | 14.5% | Held |
| MCO whale holders MOODYS CORP | $11.8M | 8.7% | Held |
| RACE whale holders FERRARI N V | $10.0M | 7.4% | Held |
| DJCO whale holders DAILY JOURNAL CORP | $5.5M | 4.1% | Held |
Top buys
No reported items for this period.
Top sells
No reported items for this period.
Allocation
- Financials: 79.8%
- Other: 12.8%
- Consumer Discretionary: 7.4%
Data notes
Report date: 2026-03-31
Disclosure source: SEC 13F
SEC 13F filings are delayed public disclosures and do not include every asset class, short positions, or real-time trades.
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Frequently asked questions
Guy Spier 13F Holdings
The Q1 2026 13F profile for Guy Spier and Aquamarine Fund shows 7 reported positions, $135.3K in disclosed portfolio value, and top holdings including Berkshire Hathaway, BERKSHIRE HATHAWAY INC DEL, MASTERCARD INCORPORATED, AMERICAN EXPRESS, and MOODYS.
What is Guy Spier buying? Latest 13F changes
The latest tracked change data for Guy Spier highlights reported buys such as notable reported positions and reported sells or reductions such as notable reported positions.
Aquamarine Fund top holdings
Aquamarine Fund top holdings are summarized from public disclosures with reported values, weights, portfolio concentration, top buys, top sells, and filing metadata where available.
Guy Spier buys and sells
Use the top buys and top sells sections above to compare Guy Spier's reported additions, reductions, exits, and latest portfolio activity against other tracked investors.
How delayed is Guy Spier's 13F data?
SEC Form 13F requires institutional investment managers with $100M+ in US equities to disclose their holdings quarterly. Read our comprehensive 13F guide for timing, coverage, and limitations. Read the Whale Analyzer 13F guide.