{
  "portfolio": "Demo Fund",
  "positions": [
    { "ticker": "AAPL", "shares": 120, "price": 189.5 },
    { "ticker": "MSFT", "shares": 75, "price": 402.1 },
    { "ticker": "NVDA", "shares": 40, "price": 118.3 }
  ],
  "totals": { "cash": 15230.42, "currency": "USD" }
}