{
 "manager": "Aquamarine Capital (Guy Spier)",
 "page": "https://www.moatshark.com/m/aquamarine-capital-guy-spier",
 "form": "13F-HR",
 "period": "2026-06-30",
 "filed": "2026-07-10",
 "previous_period": "2026-03-31",
 "filing_url": "https://www.sec.gov/Archives/edgar/data/1953324/000195332426000003/0001953324-26-000003-index.htm",
 "total_value_usd": 144091000,
 "note": "Source: SEC filings via moatshark. Values and changes are estimates; not investment advice.",
 "holdings": [
  {
   "company": "Berkshire Hathaway",
   "ticker": "BRK.B",
   "moatshark_slug": "brk-b",
   "sector": "Insurance",
   "value_usd": 71304000,
   "shares": 97630,
   "portfolio_pct": 49.49,
   "previous_pct": 50.49,
   "change": "HOLD",
   "share_change_pct": 0,
   "quarters_held": 39
  },
  {
   "company": "American Express",
   "ticker": "AXP",
   "moatshark_slug": "axp",
   "sector": "Financials",
   "value_usd": 21986000,
   "shares": 65000,
   "portfolio_pct": 15.26,
   "previous_pct": 14.53,
   "change": "HOLD",
   "share_change_pct": 0,
   "quarters_held": 39
  },
  {
   "company": "Mastercard",
   "ticker": "MA",
   "moatshark_slug": "ma",
   "sector": "Financials",
   "value_usd": 20544000,
   "shares": 40000,
   "portfolio_pct": 14.26,
   "previous_pct": 14.77,
   "change": "HOLD",
   "share_change_pct": 0,
   "quarters_held": 47
  },
  {
   "company": "Moody's",
   "ticker": "MCO",
   "moatshark_slug": "mco",
   "sector": "Financials",
   "value_usd": 12229000,
   "shares": 27000,
   "portfolio_pct": 8.49,
   "previous_pct": 8.71,
   "change": "HOLD",
   "share_change_pct": 0,
   "quarters_held": 42
  },
  {
   "company": "Ferrari",
   "ticker": "RACE",
   "moatshark_slug": "race",
   "sector": "Consumer discretionary",
   "value_usd": 11114000,
   "shares": 30000,
   "portfolio_pct": 7.71,
   "previous_pct": 7.4,
   "change": "HOLD",
   "share_change_pct": 0,
   "quarters_held": 42
  },
  {
   "company": "Daily Journal",
   "ticker": "DJCO",
   "moatshark_slug": "djco",
   "sector": "Communication and media",
   "value_usd": 6914000,
   "shares": 11500,
   "portfolio_pct": 4.8,
   "previous_pct": 4.1,
   "change": "HOLD",
   "share_change_pct": 0,
   "quarters_held": 21
  }
 ]
}