Guy Spier 13F Holdings
Aquamarine Fund. Value investor, Education of a Value Investor author.
As of the latest Q1 2026 filing, Guy Spier (managing Aquamarine Fund) reported a public portfolio value of $135.3K with 7 positions.
Open interactive portfolioGuy Spier 13F portfolio 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, or Aquamarine Fund holdings, 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 88.5% 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.
Top reported holdings
| Holding | Reported value | Weight | Quarter change |
|---|---|---|---|
| BRK.B whale holders BERKSHIRE HATHAWAY INC DEL | $46.8K | 34.6% | Held |
| BRK-A whale holders BERKSHIRE HATHAWAY INC DEL | $21.5K | 15.9% | Held |
| MA whale holders MASTERCARD INCORPORATED | $20.0K | 14.8% | Held |
| AXP whale holders AMERICAN EXPRESS CO | $19.7K | 14.5% | Held |
| MCO whale holders MOODYS CORP | $11.8K | 8.7% | Held |
| RACE whale holders FERRARI N V | $10.0K | 7.4% | Held |
| DJCO whale holders DAILY JOURNAL CORP | $5.5K | 4.1% | Held |
Top buys
No reported items for this period.
Top sells
No reported items for this period.
Allocation
- Financials: 88.5%
- Consumer Discretionary: 7.4%
- Other: 4.1%
Data notes
Report date: 2026-03-31
Disclosure source: SEC 13F
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
What is Guy Spier buying?
The latest tracked change data for Guy Spier highlights reported buys such as notable reported positions. Because 13F data is historical, use it as a research trail rather than a live trade alert.
Guy Spier 13F portfolio
The Q1 2026 SEC 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.
Aquamarine Fund holdings
Aquamarine Fund holdings are summarized from public disclosures with reported values, weights, top buys, top sells, and filing metadata where available.
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.