BLAIR WILLIAM & CO/IL
Institutional investor · Portfolio as of Q1 2026
Top Holdings1,922 positions
Stock | Shares | Value | Weight | Avg Buy | Est. P&L | Held | Conviction |
|---|---|---|---|---|---|---|---|
APPLE INC | 5.9M | $1.5B | 4.3% | $103.22 | +145.44% | 30 qtrssince 2018-Q4 | Decreased 0 |
MICROSOFT CORP | 3.5M | $1.3B | 3.7% | $123.66 | +226.64% | 30 qtrssince 2018-Q4 | Decreased 0 |
AMAZON.COM INC | 6.1M | $1.3B | 3.6% | $114.59 | +82.16% | 30 qtrssince 2018-Q4 | Decreased 0 |
NVIDIA CORP | 5.4M | $946.6M | 2.7% | $118.12 | +52.43% | 30 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL C | 3M | $870.8M | 2.5% | $95.36 | +218.33% | 30 qtrssince 2018-Q4 | Decreased 0 |
ALPHABET INC-CL A | 2.4M | $700.5M | 2.0% | $101.51 | +199.07% | 30 qtrssince 2018-Q4 | Decreased 0 |
JPMORGAN CHASE & CO | 2.3M | $678.7M | 1.9% | $105.79 | +183.82% | 30 qtrssince 2018-Q4 | Decreased 0 |
GE VERNOVA LLC | 664,603 | $580.1M | 1.7% | $407.51 | +106.62% | 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 |
STATE STREET SPDR S&P 500 ETF TRUST CL USD INC | 845,294 | $549.7M | 1.6% | $325.26 | +109.17% | 30 qtrssince 2018-Q4 | Decreased 0 |
IDEXX LABORATORIES INC | 946,336 | $531.7M | 1.5% | $189.63 | +235.14% | 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% | $200.68 | +161.27% | 30 qtrssince 2018-Q4 | Decreased 0 |
META PLATFORMS INC-CLASS A | 721,720 | $412.9M | 1.2% | $457.25 | +43.26% | 30 qtrssince 2018-Q4 | Decreased 0 |
FASTENAL CO | 7.4M | $342.1M | 1.0% | $28.80 | +59.39% | 30 qtrssince 2018-Q4 | Increased 46 |
INVESCO S&P 500 EQUAL WEIGHT | 1.7M | $322.5M | 0.9% | $188.92 | +6.97% | 30 qtrssince 2018-Q4 | Increased 70 |
AMPHENOL CORP-CL A | 2.5M | $318.4M | 0.9% | $46.48 | +178.78% | 30 qtrssince 2018-Q4 | Decreased 0 |
ISHARES CORE S&P 500 ETF | 485,839 | $317.4M | 0.9% | $384.47 | +77.74% | 30 qtrssince 2018-Q4 | Decreased 0 |
VANGUARD FTSE ALL-WORLD EX-U | 4.2M | $313.1M | 0.9% | $61.35 | +26.53% | 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 Rating: 5/5.0.
Active quarter - 151 new positions, 99 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
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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