BLAIR WILLIAM & CO/IL
Long book
$34.89B
Q1 2026
Positions
1899
Top-10 weight
26%
concentration
Last quarter
+13.1%
SPY +14.8%
Turnover
12%
of book per quarter
Strategy in plain words
auto-generated from filingsBLAIR WILLIAM & CO/IL is a mechanically diversified allocator, running a $34.89B US long book across 1899 positions.
The portfolio is moderately concentrated (top 10 ≈ 26% of the book). Turnover is modest: positions are typically held for years. Current anchor positions: APPLE INC, MICROSOFT CORP, AMAZON.COM INC, NVIDIA CORP, ALPHABET INC-CL C.
Over the last 9 quarters its long book ran on average 1.8pp per quarter behind the S&P 500, beating the index in 1 of 9 quarters. Its holdings are mechanical (indexing / client flows), so position changes carry no stock-picking signal.
Implied long-book return vs S&P 500
methodology: positions priced quarterly, no shorts/options Fund long book S&P 500
Q1 2024
-0.1%
Q2 2024
+5.7%
Q3 2024
+1.2%
Q4 2024
-3.2%
Q1 2025
+9.4%
Q2 2025
+5.0%
Q3 2025
-0.2%
Q4 2025
-6.5%
Q1 2026
+13.1%
Sector allocation
Technology 34%
Consumer discretionary 14%
Industrials 12%
Financials 11%
Healthcare 9%
Services media 8%
Other 3%
Materials 3%
Long book by quarter
What does BLAIR WILLIAM own?
Q1 2026 13F| Company | Sector | Shares | Value | % of book | Change |
|---|---|---|---|---|---|
| AAPL APPLE INC | Technology | 5.9M | $1.51B | 4.3% | -0.3% |
| MSFT MICROSOFT CORP | Technology | 3.5M | $1.29B | 3.7% | -2.1% |
| AMZN AMAZON.COM INC | Consumer discretionary | 6.1M | $1.26B | 3.6% | -0.1% |
| NVDA NVIDIA CORP | Technology | 5.4M | $946.6M | 2.7% | -1.2% |
| GOOG ALPHABET INC-CL C | Technology | 3.0M | $870.8M | 2.5% | -2.7% |
| GOOGL ALPHABET INC-CL A | Technology | 2.4M | $700.5M | 2.0% | -2.3% |
| JPM JPMORGAN CHASE & CO | Financials | 2.3M | $678.7M | 1.9% | -0.1% |
| GEV GE VERNOVA INC | Industrials | 664.6K | $580.1M | 1.7% | +1.9% |
| V VISA INC-CLASS A SHARES | Services media | 1.8M | $557.5M | 1.6% | -4.4% |
| IDXX IDEXX LABORATORIES INC | Materials | 946.3K | $531.7M | 1.5% | -5.5% |
| COST COSTCO WHOLESALE CORP | Consumer discretionary | 521.3K | $519.4M | 1.5% | 0.0% |
| MA MASTERCARD INC - A | Services media | 923.4K | $461.4M | 1.3% | -3.3% |
| META META PLATFORMS INC-CLASS A | Technology | 721.7K | $412.9M | 1.2% | -2.0% |
| FAST FASTENAL CO | Consumer discretionary | 7.4M | $342.1M | 1.0% | +5.1% |
| APH AMPHENOL CORP-CL A | Technology | 2.5M | $318.4M | 0.9% | -5.0% |
| LLY ELI LILLY & CO | Healthcare | 324.0K | $298.0M | 0.9% | -0.2% |
| WMT WALMART INC | Consumer discretionary | 2.4M | $295.1M | 0.8% | -1.6% |
| BWXT BWX TECHNOLOGIES INC | Industrials | 1.4M | $294.1M | 0.8% | -0.1% |
| ABBV ABBVIE INC | Healthcare | 1.3M | $290.2M | 0.8% | -0.3% |
| AVGO BROADCOM INC | Technology | 918.3K | $284.2M | 0.8% | +2.4% |
| SYK STRYKER CORP | Healthcare | 847.7K | $278.5M | 0.8% | +0.3% |
| ICE INTERCONTINENTAL EXCHANGE IN | Financials | 1.6M | $250.6M | 0.7% | -5.7% |
| HD HOME DEPOT INC | Consumer discretionary | 761.4K | $250.4M | 0.7% | +0.7% |
| DHR DANAHER CORP | Technology | 1.3M | $245.9M | 0.7% | -5.5% |
| PGR PROGRESSIVE CORP | Financials | 1.2M | $241.8M | 0.7% | -13.3% |
| BRK/B BERKSHIRE HATHAWAY INC-CL B | Financials | 495.3K | $237.4M | 0.7% | +10.8% |
| UBER UBER TECHNOLOGIES INC | Services media | 3.3M | $237.3M | 0.7% | -19.7% |
| JNJ JOHNSON & JOHNSON | Healthcare | 955.6K | $233.6M | 0.7% | +0.6% |
| ECL ECOLAB INC | Other | 866.4K | $230.5M | 0.7% | +1.0% |
| WSO WATSCO INC | Consumer discretionary | 582.7K | $212.0M | 0.6% | -13.7% |
| AXP AMERICAN EXPRESS CO | Financials | 693.8K | $209.9M | 0.6% | -0.9% |
| PANW PALO ALTO NETWORKS INC | Technology | 1.3M | $209.2M | 0.6% | +4.4% |
| ISRG INTUITIVE SURGICAL INC | Healthcare | 425.2K | $196.0M | 0.6% | -3.2% |
| TDG TRANSDIGM GROUP INC | Industrials | 166.2K | $192.7M | 0.6% | -2.3% |
| NOW SERVICENOW INC | Technology | 1.8M | $188.3M | 0.5% | -18.7% |
| VEEV VEEVA SYSTEMS INC-CLASS A | Technology | 1.1M | $187.5M | 0.5% | -13.1% |
| BA BOEING CO/THE | Industrials | 922.1K | $183.5M | 0.5% | +35.9% |
| P EVERPURE INC-A | Technology | 2.9M | $172.3M | 0.5% | -4.4% |
| NFLX NETFLIX INC | Services media | 1.8M | $169.6M | 0.5% | +17.9% |
| CTAS CINTAS CORP | Other | 973.6K | $164.7M | 0.5% | -2.2% |
| XOM EXXON MOBIL CORP | Energy | 946.4K | $160.6M | 0.5% | -2.2% |
| CVX CHEVRON CORP | Energy | 716.0K | $148.1M | 0.4% | +7.4% |
| GWRE GUIDEWIRE SOFTWARE INC | Technology | 975.3K | $145.9M | 0.4% | -14.0% |
| ANET ARISTA NETWORKS INC | Technology | 1.2M | $141.3M | 0.4% | +2.4% |
| ABT ABBOTT LABORATORIES | Healthcare | 1.3M | $136.3M | 0.4% | -15.8% |
| AON AON PLC-CLASS A | Financials | 421.6K | $136.1M | 0.4% | -15.1% |
| BX BLACKSTONE INC | Financials | 1.2M | $135.5M | 0.4% | -13.9% |
| CPRT COPART INC | Consumer discretionary | 4.1M | $135.2M | 0.4% | -7.8% |
| AAON AAON INC | Industrials | 1.6M | $134.2M | 0.4% | -3.4% |
| GS GOLDMAN SACHS GROUP INC | Financials | 156.3K | $132.2M | 0.4% | +0.8% |
13F filing history
| Period | Form | Filed | Entries | Reported value | Flags | Source |
|---|---|---|---|---|---|---|
| Q1 2026 | 13F-HR | May 8, 2026 | 1922 | $34.90B | canonical | SEC ↗ |
| Q4 2025 | 13F-HR | Feb 17, 2026 | 1920 | $37.26B | canonical | SEC ↗ |
| Q3 2025 | 13F-HR | Nov 12, 2025 | 1844 | $37.57B | canonical | SEC ↗ |
| Q2 2025 | 13F-HR | Jul 24, 2025 | 1824 | $36.00B | canonical | SEC ↗ |
| Q1 2025 | 13F-HR | May 9, 2025 | 1801 | $33.16B | canonical | SEC ↗ |
| Q4 2024 | 13F-HR | Feb 12, 2025 | 1816 | $34.38B | canonical | SEC ↗ |
| Q3 2024 | 13F-HR | Nov 12, 2024 | 1821 | $34.05B | canonical | SEC ↗ |
| Q2 2024 | 13F-HR | Aug 12, 2024 | 1822 | $32.42B | canonical | SEC ↗ |
| Q1 2024 | 13F-HR | May 9, 2024 | 1787 | $31.84B | canonical | SEC ↗ |
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