{
  "data": {
    "slug": "andreas-halvorsen",
    "name": "Andreas Halvorsen",
    "fund": "Viking Global Investors",
    "role": "Co-Founder & CIO",
    "philosophy": "Long-short equity, deep fundamental research, Tiger Cub pedigree.",
    "bio": "Co-founded Viking Global in 1999 after leaving Julian Robertson's Tiger Management. Runs one of the largest and most respected long-short equity hedge funds, famous for patient fundamental research and concentrated positions.",
    "longest_holding": "Visa (since 2015)",
    "quality_score": 8,
    "cagr_10y": 9.6,
    "holdings": [
      {
        "ticker": "META",
        "name": "Meta Platforms",
        "pct": 6.4,
        "shares_mn": 3.5,
        "thesis": "Top position. Built aggressively through 2025."
      },
      {
        "ticker": "V",
        "name": "Visa",
        "pct": 5.8,
        "shares_mn": 4.2,
        "thesis": "Payment network compounder — decade-long hold."
      },
      {
        "ticker": "MSFT",
        "name": "Microsoft",
        "pct": 4.8,
        "shares_mn": 1.9,
        "thesis": "Quality AI infrastructure play."
      },
      {
        "ticker": "NVDA",
        "name": "NVIDIA",
        "pct": 6.2,
        "shares_mn": 3.4,
        "thesis": "AI compute leader."
      },
      {
        "ticker": "UNH",
        "name": "UnitedHealth",
        "pct": 4.1,
        "shares_mn": 0.8,
        "thesis": "Healthcare scale."
      },
      {
        "ticker": "MA",
        "name": "Mastercard",
        "pct": 3.7,
        "shares_mn": 0.6,
        "thesis": "The other payment network."
      }
    ],
    "recent_moves": [
      {
        "quarter": "2025-Q4",
        "ticker": "META",
        "action": "add",
        "delta_pct": 78,
        "portfolio_impact_pct": 1.02
      },
      {
        "quarter": "2025-Q4",
        "ticker": "MSFT",
        "action": "add",
        "delta_pct": 22,
        "portfolio_impact_pct": 4.8
      },
      {
        "quarter": "2025-Q4",
        "ticker": "NVDA",
        "action": "add",
        "delta_pct": 18,
        "portfolio_impact_pct": 6.2
      },
      {
        "quarter": "2025-Q3",
        "ticker": "META",
        "action": "add",
        "delta_pct": 45,
        "portfolio_impact_pct": 1.13
      },
      {
        "quarter": "2025-Q2",
        "ticker": "META",
        "action": "add",
        "delta_pct": 25,
        "portfolio_impact_pct": 0.8
      },
      {
        "quarter": "2025-Q2",
        "ticker": "MSFT",
        "action": "add",
        "delta_pct": 15,
        "portfolio_impact_pct": 3.8
      },
      {
        "quarter": "2025-Q1",
        "ticker": "META",
        "action": "new",
        "delta_pct": null,
        "portfolio_impact_pct": 0.6
      },
      {
        "quarter": "2024-Q4",
        "ticker": "META",
        "action": "add",
        "delta_pct": 32,
        "portfolio_impact_pct": 0.7
      },
      {
        "quarter": "2024-Q4",
        "ticker": "MSFT",
        "action": "add",
        "delta_pct": 18,
        "portfolio_impact_pct": 4.2
      },
      {
        "quarter": "2024-Q3",
        "ticker": "META",
        "action": "add",
        "delta_pct": 22,
        "portfolio_impact_pct": 0.6
      },
      {
        "quarter": "2024-Q2",
        "ticker": "META",
        "action": "new",
        "delta_pct": null,
        "portfolio_impact_pct": 0.5
      },
      {
        "quarter": "2026-Q1",
        "ticker": "V",
        "action": "add",
        "delta_pct": 59,
        "portfolio_impact_pct": 5.4
      },
      {
        "quarter": "2026-Q1",
        "ticker": "TSM",
        "action": "trim",
        "delta_pct": -9,
        "portfolio_impact_pct": 4.2
      },
      {
        "quarter": "2026-Q1",
        "ticker": "SCHW",
        "action": "add",
        "delta_pct": 6,
        "portfolio_impact_pct": 3.9
      },
      {
        "quarter": "2026-Q1",
        "ticker": "DHR",
        "action": "add",
        "delta_pct": 19,
        "portfolio_impact_pct": 3.6
      },
      {
        "quarter": "2026-Q1",
        "ticker": "FTV",
        "action": "add",
        "delta_pct": 17,
        "portfolio_impact_pct": 3.5
      },
      {
        "quarter": "2026-Q1",
        "ticker": "AAPL",
        "action": "new",
        "delta_pct": 100,
        "portfolio_impact_pct": 2.6
      },
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        "quarter": "2026-Q1",
        "ticker": "TSLA",
        "action": "add",
        "delta_pct": 47,
        "portfolio_impact_pct": 2.6
      },
      {
        "quarter": "2026-Q1",
        "ticker": "BBIO",
        "action": "trim",
        "delta_pct": -18,
        "portfolio_impact_pct": 2.5
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      {
        "quarter": "2026-Q1",
        "ticker": "CVNA",
        "action": "add",
        "delta_pct": 162,
        "portfolio_impact_pct": 2.4
      },
      {
        "quarter": "2026-Q1",
        "ticker": "MSFT",
        "action": "trim",
        "delta_pct": -28,
        "portfolio_impact_pct": 2.4
      },
      {
        "quarter": "2026-Q1",
        "ticker": "TMO",
        "action": "add",
        "delta_pct": 110,
        "portfolio_impact_pct": 2.3
      },
      {
        "quarter": "2026-Q1",
        "ticker": "JPM",
        "action": "add",
        "delta_pct": 42,
        "portfolio_impact_pct": 2.2
      },
      {
        "quarter": "2026-Q1",
        "ticker": "CSX",
        "action": "add",
        "delta_pct": 35,
        "portfolio_impact_pct": 2.1
      },
      {
        "quarter": "2026-Q1",
        "ticker": "GOOGL",
        "action": "trim",
        "delta_pct": -10,
        "portfolio_impact_pct": 1.9
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        "quarter": "2026-Q1",
        "ticker": "FEDEX",
        "action": "new",
        "delta_pct": 100,
        "portfolio_impact_pct": 1.9
      },
      {
        "quarter": "2026-Q1",
        "ticker": "GM",
        "action": "add",
        "delta_pct": 35,
        "portfolio_impact_pct": 1.9
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      {
        "quarter": "2026-Q1",
        "ticker": "META",
        "action": "new",
        "delta_pct": 100,
        "portfolio_impact_pct": 1.7
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      {
        "quarter": "2026-Q1",
        "ticker": "TMUS",
        "action": "trim",
        "delta_pct": -21,
        "portfolio_impact_pct": 1.7
      },
      {
        "quarter": "2026-Q1",
        "ticker": "ATI",
        "action": "new",
        "delta_pct": 100,
        "portfolio_impact_pct": 1.4
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        "quarter": "2026-Q1",
        "ticker": "HCA",
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        "delta_pct": 8,
        "portfolio_impact_pct": 1.4
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      {
        "quarter": "2026-Q1",
        "ticker": "CB",
        "action": "add",
        "delta_pct": 28,
        "portfolio_impact_pct": 1.2
      },
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        "quarter": "2026-Q1",
        "ticker": "BMRN",
        "action": "add",
        "delta_pct": 17,
        "portfolio_impact_pct": 1.1
      },
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        "quarter": "2026-Q1",
        "ticker": "SEA",
        "action": "add",
        "delta_pct": 29,
        "portfolio_impact_pct": 1.1
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        "quarter": "2026-Q1",
        "ticker": "AON",
        "action": "add",
        "delta_pct": 39,
        "portfolio_impact_pct": 1
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        "quarter": "2026-Q1",
        "ticker": "WAT",
        "action": "new",
        "delta_pct": 100,
        "portfolio_impact_pct": 1
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        "quarter": "2026-Q1",
        "ticker": "PGR",
        "action": "add",
        "delta_pct": 21,
        "portfolio_impact_pct": 0.9
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        "quarter": "2026-Q1",
        "ticker": "COF",
        "action": "trim",
        "delta_pct": -45,
        "portfolio_impact_pct": 0.8
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        "quarter": "2026-Q1",
        "ticker": "AMZN",
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        "portfolio_impact_pct": 0.7
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        "ticker": "API",
        "action": "trim",
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        "ticker": "BSX",
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    "quarter_label": "Q1 2026",
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