BLAIR WILLIAM & CO/IL
Institutional investor · Portfolio as of Q4 2025
Top Holdings1,867 positions
Stock | Shares | Value | Weight | Avg Buy | Est. P&L | Held | Conviction |
|---|---|---|---|---|---|---|---|
MICROSOFT CORP | 3.6M | $1.7B | 4.6% | $123.66 | +294.21% | 29 qtrssince 2018-Q4 | Decreased 0 |
APPLE INC | 5.9M | $1.6B | 4.3% | $103.22 | +162.67% | 29 qtrssince 2018-Q4 | Decreased 0 |
AMAZON.COM INC | 6.1M | $1.4B | 3.8% | $114.59 | +102.93% | 29 qtrssince 2018-Q4 | Increased 59 |
NVIDIA CORP | 5.5M | $1B | 2.8% | $118.12 | +58.77% | 29 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL C | 3.1M | $978.7M | 2.6% | $95.36 | +229.86% | 29 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL A | 2.5M | $780.5M | 2.1% | $101.51 | +209.18% | 29 qtrssince 2018-Q4 | Decreased 0 |
JPMORGAN CHASE & CO | 2.3M | $744.3M | 2.0% | $105.79 | +204.34% | 29 qtrssince 2018-Q4 | Increased 50 |
IDEXX LABORATORIES INC | 1M | $677.5M | 1.8% | $189.63 | +259.81% | 29 qtrssince 2018-Q4 | Decreased 0 |
VISA INC-CLASS A SHARES | 1.9M | $676.6M | 1.8% | $133.30 | +161.52% | 29 qtrssince 2018-Q4 | Decreased 0 |
STATE STREET SPDR S&P 500 ETF TRUST CL USD INC | 857,803 | $585M | 1.6% | $325.26 | +111.22% | 29 qtrssince 2018-Q4 | Decreased 0 |
MASTERCARD INC - A | 955,188 | $545.3M | 1.5% | $200.68 | +187.29% | 29 qtrssince 2018-Q4 | Decreased 0 |
META PLATFORMS INC-CLASS A | 736,202 | $486M | 1.3% | $457.25 | +45.64% | 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% | $399.32 | +65.07% | 7 qtrssince 2024-Q2 | Increased 51 |
AMPHENOL CORP-CL A | 2.7M | $358.6M | 1.0% | $46.39 | +190.28% | 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% | $145.58 | +5.94% | 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% | $384.47 | +79.45% | 29 qtrssince 2018-Q4 | Increased 48 |
PROGRESSIVE CORP | 1.4M | $320.4M | 0.9% | $90.99 | +137.65% | 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 Rating: 4.5/5.0.
Active quarter - 122 new positions, 99 exits, 763 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
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.
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Data sourced from SEC EDGAR 13F filings. Not financial advice. Full disclaimer