Data as of Q4 2025 (Dec 31, 2025)·Next filing deadline: May 15, 2026

BLAIR WILLIAM & CO/IL

•CIK: 902367•Filing: Q4 2025

BLAIR WILLIAM & CO/IL, managed by the seasoned Blair William, maintains a tech-heavy portfolio with top holdings in MSFT, AAPL, and AMZN, reflecting a strong focus on growth and innovation. Recently, the fund has made notable moves by adding high-growth names like ARGX and POCT, while exiting positions in SAP and FITBM, signaling a strategic pivot towards emerging opportunities in the biotech and healthcare sectors.

Total AUM

$37.3B

QoQ Performance

-0.8%

Positions

1,215

Top 10 Concentration

31.7%

Latest Filing

Q4 2025

Top Holdings Allocation

MSFT4.6%

AAPL4.3%

AMZN3.8%

NVDA2.8%

GOOG2.6%

GOOGL2.1%

JPM2.0%

IDXX1.8%

📈 Biggest Buys

SERVICENOW INC

+455.0%

0.9% of portfolio

NETFLIX INC

+902.3%

0.4% of portfolio

BWX TECHNOLOGIES INC

+20.9%

0.7% of portfolio

META PLATFORMS INC

+8.4%

1.3% of portfolio

VANGUARD INTL EQUITY INDEX F

+19.6%

0.5% of portfolio

📉 Biggest Sells

FISERV INC

-70.6%

0.1% of portfolio

CLEARWATER ANALYTICS HLDGS I

-52.7%

0.2% of portfolio

COSTAR GROUP INC

-35.3%

0.4% of portfolio

ZOETIS INC

-28.8%

0.3% of portfolio

WATSCO INC

-15.6%

0.6% of portfolio

Sector Breakdown

Other42.7%

Technology24.5%

Consumer9.6%

Financial9.5%

Healthcare5.3%

ETF3.6%

Industrial1.8%

Materials1.1%

🚪 Exited Positionssold since Q3 2025

POOL CORP

SOLD

$85.8M

CHIPOTLE MEXICAN GRILL INC

SOLD

$58.6M

GALLAGHER ARTHUR J & CO

SOLD

$35.2M

DESCARTES SYS GROUP INC

SOLD

$32.6M

IRON MTN INC DEL

SOLD

$32.5M

+1635 more exited positions

Changes from Q3 2025

↑104 increased

↓96 decreased

Historical Filings

Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023

📌 Top Holdings

NVIDIA CORPORATION

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