WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Institutional investor · Portfolio as of Q1 2021
Top Holdings367 positions
TAIWAN SEMICONDUCTOR MANUFAC | 10.3M | $1.2B | 4.0% | $31.98 | +238.76% | 10 qtrssince 2018-Q4 | Decreased 0 |
STATE STR SPDR S&P 500 ETF T | 1.4M | $565.3M | 1.8% | $231.05 | +59.40% | 10 qtrssince 2018-Q4 | Decreased 0 |
BWX TECHNOLOGIES INC | 7.5M | $492M | 1.6% | $37.76 | +64.41% | 10 qtrssince 2018-Q4 | Increased 50 |
MICROSOFT CORP | 1.9M | $454.2M | 1.5% | $142.55 | +58.07% | 10 qtrssince 2018-Q4 | Increased 56 |
CANADIAN NATL RY CO | 3.8M | $442.8M | 1.4% | $72.00 | +44.60% | 10 qtrssince 2018-Q4 | Increased 58 |
GRAND CANYON ED INC | 4.1M | $439.3M | 1.4% | $93.41 | +14.66% | 10 qtrssince 2018-Q4 | Increased 49 |
BRINKS CO | 5.3M | $422.5M | 1.4% | $59.18 | +25.93% | 10 qtrssince 2018-Q4 | Increased 50 |
MERCADOLIBRE INC | 275,029 | $404.9M | 1.3% | $753.56 | +95.36% | 8 qtrssince 2019-Q2 | Decreased 0 |
AMAZON COM INC | 125,832 | $389.3M | 1.3% | $89.29 | +73.26% | 10 qtrssince 2018-Q4 | Increased 51 |
HORIZON THERAPEUTICS PUB L | 4.1M | $381.9M | 1.2% | — | — | 8 qtrssince 2019-Q2 | Decreased 0 |
ENCOMPASS HEALTH CORP | 4.6M | $376.7M | 1.2% | $45.56 | +35.25% | 10 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC | 162,957 | $336.1M | 1.1% | $55.40 | +84.39% | 10 qtrssince 2018-Q4 | Increased 49 |
CROWN HLDGS INC | 3.4M | $334.1M | 1.1% | $62.91 | +45.46% | 9 qtrssince 2019-Q1 | Increased 54 |
PURE STORAGE INC | 15.5M | $333M | 1.1% | $17.08 | +26.09% | 10 qtrssince 2018-Q4 | Decreased 0 |
MARTIN MARIETTA MATLS INC | 982,332 | $329.9M | 1.1% | $169.62 | +91.40% | 10 qtrssince 2018-Q4 | Decreased 0 |
SEA LTD | 1.4M | $323M | 1.0% | $80.67 | +165.73% | 8 qtrssince 2019-Q2 | Decreased 0 |
Azenta, Inc | 3.9M | $317.5M | 1.0% | $34.84 | +127.45% | 5 qtrssince 2020-Q1 | Increased 49 |
BIO-TECHNE CORP | 826,437 | $315.6M | 1.0% | $79.24 | +17.60% | 2 qtrssince 2020-Q4 | Increased 55 |
BJS WHSL CLUB HLDGS INC | 6.8M | $304.9M | 1.0% | $26.58 | +68.84% | 8 qtrssince 2019-Q2 | Decreased 0 |
ABIOMED INC | 937,156 | $298.7M | 1.0% | — | — | 10 qtrssince 2018-Q4 | Increased 64 |
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC manages $30.9B across 367 positions as of Q1 2021. Top holdings: TSM (4.0%), SPY (1.8%), BWXT (1.6%). Fund DNA: Balanced Allocator. HoldingsIntel Score: 3/5.0.
Active quarter - 34 new positions, 23 exits, 151 increased. Top move: ABMD (INCREASED, conviction 64). Portfolio: $30.9B across 367 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