BLAIR WILLIAM & CO/IL
Institutional investor · Portfolio as of Q4 2025
Top Holdings1,867 positions
Microsoft Corp | 3.6M | $1.7B | 4.6% | $123.78 | +288.24% | 29 qtrssince 2018-Q4 | Decreased 0 |
Apple Inc | 5.9M | $1.6B | 4.3% | $54.92 | +393.70% | 29 qtrssince 2018-Q4 | Decreased 0 |
Amazon.com Inc | 6.1M | $1.4B | 3.8% | $98.19 | +135.06% | 29 qtrssince 2018-Q4 | Increased 59 |
NVIDIA Corp | 5.5M | $1B | 2.8% | $50.26 | +270.17% | 29 qtrssince 2018-Q4 | Decreased 0 |
Alphabet Inc | 3.1M | $978.7M | 2.6% | $57.19 | +447.62% | 29 qtrssince 2018-Q4 | Decreased 0 |
Alphabet Inc | 2.5M | $780.5M | 2.1% | $69.20 | +351.43% | 29 qtrssince 2018-Q4 | Decreased 0 |
JPMorgan Chase & Co | 2.3M | $744.3M | 2.0% | $105.11 | +202.25% | 29 qtrssince 2018-Q4 | Increased 50 |
IDEXX Laboratories Inc | 1M | $677.5M | 1.8% | $189.80 | +256.44% | 29 qtrssince 2018-Q4 | Decreased 0 |
Visa Inc | 1.9M | $676.6M | 1.8% | $133.30 | +161.52% | 29 qtrssince 2018-Q4 | Decreased 0 |
SPDR S&P 500 ETF Trust | 857,803 | $585M | 1.6% | $323.38 | +109.24% | 29 qtrssince 2018-Q4 | Decreased 0 |
Mastercard Inc | 955,188 | $545.3M | 1.5% | $201.87 | +181.42% | 29 qtrssince 2018-Q4 | Decreased 0 |
Facebook Inc | 736,202 | $486M | 1.3% | $454.44 | +44.88% | 29 qtrssince 2018-Q4 | Increased 54 |
Costco Wholesale Corp | 521,182 | $449.4M | 1.2% | $313.56 | +173.80% | 29 qtrssince 2018-Q4 | Decreased 0 |
GE Vernova LLC | 652,306 | $426.3M | 1.1% | $403.55 | +61.66% | 7 qtrssince 2024-Q2 | Increased 51 |
Amphenol Corp | 2.7M | $358.6M | 1.0% | $10.40 | +546.47% | 29 qtrssince 2018-Q4 | Decreased 0 |
Eli Lilly & Co | 324,796 | $349.1M | 0.9% | $264.74 | +303.98% | 29 qtrssince 2018-Q4 | Increased 48 |
ServiceNow Inc | 2.2M | $339.3M | 0.9% | $109.98 | +39.29% | 29 qtrssince 2018-Q4 | Increased 71 |
Uber Technologies Inc | 4.1M | $335.6M | 0.9% | $51.69 | +58.87% | 27 qtrssince 2019-Q2 | Decreased 0 |
iShares Core S&P 500 ETF | 488,420 | $334.5M | 0.9% | $381.28 | +78.17% | 29 qtrssince 2018-Q4 | Increased 48 |
Progressive Corp/The | 1.4M | $320.4M | 0.9% | $91.06 | +134.81% | 29 qtrssince 2018-Q4 | Decreased 0 |
BLAIR WILLIAM & CO/IL manages $37.3B across 1867 positions as of Q4 2025. Top holdings: MSFT (4.6%), AAPL (4.3%), AMZN (3.8%). Fund DNA: Balanced Allocator. HoldingsIntel Score: 4.5/5.0.
Active quarter - 124 new positions, 101 exits, 764 increased. Top move: NOW (INCREASED, conviction 71). Portfolio: $37.3B across 1867 positions.
Top holdings by portfolio weight
Portfolio allocation by GICS sector
Behavioral investing profile
Position Outcomes
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Cost basis estimates based on full filing history using quarter-end prices. Actual transaction prices are not disclosed in 13F filings.
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Data sourced from SEC EDGAR 13F filings. Not financial advice. Full disclaimer
Verify source filings on SEC EDGAR