BLAIR WILLIAM & CO/IL
Institutional investor · Portfolio as of Q3 2025
Top Holdings1,844 positions
Microsoft Corp | 3.6M | $1.9B | 5.0% | $123.78 | +315.02% | 28 qtrssince 2018-Q4 | Decreased 0 |
Apple Inc | 6M | $1.5B | 4.1% | $54.92 | +361.96% | 28 qtrssince 2018-Q4 | Decreased 0 |
Amazon.com Inc | 6M | $1.3B | 3.5% | $96.92 | +126.54% | 28 qtrssince 2018-Q4 | Decreased 0 |
NVIDIA Corp | 5.6M | $1.1B | 2.8% | $50.26 | +270.31% | 28 qtrssince 2018-Q4 | Increased 55 |
Alphabet Inc | 3.1M | $766.2M | 2.0% | $57.19 | +324.75% | 28 qtrssince 2018-Q4 | Decreased 0 |
JPMorgan Chase & Co | 2.3M | $727.7M | 1.9% | $104.85 | +195.20% | 28 qtrssince 2018-Q4 | Decreased 0 |
Visa Inc | 2M | $669.8M | 1.8% | $133.30 | +154.06% | 28 qtrssince 2018-Q4 | Decreased 0 |
IDEXX Laboratories Inc | 1M | $659.2M | 1.8% | $189.80 | +236.61% | 28 qtrssince 2018-Q4 | Decreased 0 |
Alphabet Inc | 2.5M | $614.1M | 1.6% | $69.20 | +250.39% | 28 qtrssince 2018-Q4 | Increased 49 |
SPDR S&P 500 ETF Trust | 859,344 | $572.5M | 1.5% | $323.38 | +103.81% | 28 qtrssince 2018-Q4 | Decreased 0 |
Mastercard Inc | 976,597 | $555.5M | 1.5% | $201.87 | +180.03% | 28 qtrssince 2018-Q4 | Decreased 0 |
Costco Wholesale Corp | 551,558 | $510.5M | 1.4% | $313.56 | +193.48% | 28 qtrssince 2018-Q4 | Decreased 0 |
Facebook Inc | 678,857 | $498.5M | 1.3% | $437.22 | +67.40% | 28 qtrssince 2018-Q4 | Increased 58 |
Uber Technologies Inc | 4.2M | $416.1M | 1.1% | $51.69 | +92.63% | 26 qtrssince 2019-Q2 | Decreased 0 |
GE Vernova LLC | 628,121 | $386.2M | 1.0% | $393.97 | +55.73% | 6 qtrssince 2024-Q2 | Decreased 0 |
Veeva Systems Inc | 1.3M | $384.1M | 1.0% | $100.58 | +196.20% | 28 qtrssince 2018-Q4 | Increased 49 |
ServiceNow Inc | 399,081 | $367.3M | 1.0% | $105.23 | +74.91% | 28 qtrssince 2018-Q4 | Increased 53 |
Progressive Corp/The | 1.4M | $355.4M | 0.9% | $91.06 | +154.53% | 28 qtrssince 2018-Q4 | Decreased 0 |
Fastenal Co | 7M | $341.6M | 0.9% | $13.49 | +255.89% | 28 qtrssince 2018-Q4 | Increased 45 |
Amphenol Corp | 2.8M | $340.5M | 0.9% | $10.40 | +490.84% | 28 qtrssince 2018-Q4 | Decreased 0 |
BLAIR WILLIAM & CO/IL manages $37.6B across 1844 positions as of Q3 2025. Top holdings: MSFT (5.0%), AAPL (4.1%), AMZN (3.5%). Fund DNA: Balanced Allocator. HoldingsIntel Score: 4.5/5.0.
Active quarter - 101 new positions, 81 exits, 695 increased. Top move: META (INCREASED, conviction 58). Portfolio: $37.6B across 1844 positions.
Top holdings by portfolio weight
Portfolio allocation by GICS sector
Behavioral investing profile
Position Outcomes
Best and worst performing positions by estimated return
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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