BLAIR WILLIAM & CO/IL

Q1 2026 13F-HR Holdings

Location
Chicago, IL
Holdings as of
3/31/2026
Date filed
5/8/2026
Form type
13F-HR
Num holdings
1,922
Total value ($000)
$34,895,892
Net value change ($000)
-2,363,614 (-6.3%)
New positions
134
Sold out positions
97
Turnover %
0.6%
Sector allocation + QoQ delta (equities-only)
Prev filing: 2/17/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q4 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
RSP 217,187 206.1%
GEV 153,805 36.1%
VEU 113,611 57.0%
PWR 90,104 265.9%
COST 69,981 15.6%
GLD 65,269 64.5%
FAST 60,641 21.5%
VTV 57,238 33.4%
VEA 50,793 25.8%
MDLN 49,844 2470.0%
Top Reduces (Value $000, Stocks/ETFs)
MSFT -433,837 -25.1%
NOW -150,998 -44.5%
IDXX -145,723 -21.5%
WDAY -145,015 -81.4%
APP -142,698 -71.9%
AMZN -138,103 -9.9%
V -119,096 -17.6%
AAPL -112,346 -6.9%
TYL -109,567 -58.5%
GOOGL -107,828 -11.0%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type