{
 "company": "Grayscale Bitcoin Trust Etf",
 "ticker": "GBTC",
 "page": "https://www.moatshark.com/s/gbtc",
 "note": "Source: SEC filings via moatshark. Values and changes are estimates; not investment advice.",
 "holders": [
  {
   "manager": "Horizon Kinetics",
   "moatshark_slug": "horizon-kinetics",
   "period": "2026-06-30",
   "portfolio_pct": 6.27,
   "value_usd": 552612345,
   "change": "REDUCE",
   "share_change_pct": -13.3,
   "quarters_held": 15
  }
 ]
}