BLAIR WILLIAM & CO/IL
Institutional investor · Portfolio as of Q1 2026
Top Holdings1,922 positions
APPLE INC | 5.9M | $1.5B | 4.3% | $54.92 | +361.32% | 30 qtrssince 2018-Q4 | Decreased 0 |
MICROSOFT CORP | 3.5M | $1.3B | 3.7% | $123.78 | +197.84% | 30 qtrssince 2018-Q4 | Decreased 0 |
AMAZON.COM INC | 6.1M | $1.3B | 3.6% | $98.19 | +112.10% | 30 qtrssince 2018-Q4 | Decreased 0 |
NVIDIA CORP | 5.4M | $946.6M | 2.7% | $50.26 | +246.17% | 30 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL C | 3M | $870.8M | 2.5% | $57.19 | +400.96% | 30 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL A | 2.4M | $700.5M | 2.0% | $69.20 | +315.03% | 30 qtrssince 2018-Q4 | Decreased 0 |
JPMORGAN CHASE & CO | 2.3M | $678.7M | 1.9% | $105.11 | +177.17% | 30 qtrssince 2018-Q4 | Decreased 0 |
GE VERNOVA INC | 664,603 | $580.1M | 1.7% | $412.22 | +111.65% | 8 qtrssince 2024-Q2 | Increased 50 |
VISA INC-CLASS A SHARES | 1.8M | $557.5M | 1.6% | $133.30 | +125.84% | 30 qtrssince 2018-Q4 | Decreased 0 |
SPDR S&P 500 ETF TRUST | 845,294 | $549.7M | 1.6% | $323.38 | +100.09% | 30 qtrssince 2018-Q4 | Decreased 0 |
IDEXX LABORATORIES INC | 946,336 | $531.7M | 1.5% | $189.80 | +196.04% | 30 qtrssince 2018-Q4 | Decreased 0 |
COSTCO WHOLESALE CORP | 521,277 | $519.4M | 1.5% | $313.69 | +216.69% | 30 qtrssince 2018-Q4 | Increased 49 |
MASTERCARD INC - A | 923,405 | $461.4M | 1.3% | $201.87 | +146.68% | 30 qtrssince 2018-Q4 | Decreased 0 |
FACEBOOK INC-CLASS A | 721,720 | $412.9M | 1.2% | $454.44 | +25.68% | 30 qtrssince 2018-Q4 | Decreased 0 |
FASTENAL CO | 7.4M | $342.1M | 1.0% | $15.24 | +201.23% | 30 qtrssince 2018-Q4 | Increased 46 |
INVESCO S&P 500 EQUAL WEIGHT | 1.7M | $322.5M | 0.9% | $180.40 | +5.58% | 30 qtrssince 2018-Q4 | Increased 70 |
AMPHENOL CORP-CL A | 2.5M | $318.4M | 0.9% | $10.40 | +505.62% | 30 qtrssince 2018-Q4 | Decreased 0 |
ISHARES TR | 485,839 | $317.4M | 0.9% | $381.28 | +70.37% | 30 qtrssince 2018-Q4 | Decreased 0 |
VANGUARD INTL EQUITY INDEX F | 4.2M | $313.1M | 0.9% | $59.95 | +24.40% | 30 qtrssince 2018-Q4 | Increased 61 |
ELI LILLY & CO | 324,018 | $298M | 0.9% | $264.74 | +246.33% | 30 qtrssince 2018-Q4 | Decreased 0 |
BLAIR WILLIAM & CO/IL manages $34.9B across 1922 positions as of Q1 2026. Top holdings: AAPL (4.3%), MSFT (3.7%), AMZN (3.6%). Fund DNA: Balanced Allocator. HoldingsIntel Score: 4.5/5.0.
Active quarter - 155 new positions, 100 exits, 799 increased. Top move: RSP (INCREASED, conviction 70). Portfolio: $34.9B across 1922 positions.
Top holdings by portfolio weight
Portfolio allocation by GICS sector
Behavioral investing profile
Position Outcomes
Best and worst performing positions by estimated return
Top Winners
Top Losers
Cost basis estimates based on full filing history using quarter-end prices. Actual transaction prices are not disclosed in 13F filings.
Similar Funds
Funds with similar investing DNA
Explore More
Accumulation Streaks
Positions with 2+ consecutive quarters of increases - persistent directional conviction.
Continue exploring
Data sourced from SEC EDGAR 13F filings. Not financial advice. Full disclaimer
Verify source filings on SEC EDGAR