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Latest BLAIR WILLIAM & CO/IL Stock Portfolio

$34.90Billion– No. of Holdings #1890

BLAIR WILLIAM & CO/IL Performance:
2026 Q1: -5.74%YTD: -5.74%2025: 10.15%
Performance for 2026 Q1 is -5.74%, and YTD is -5.74%, and 2025 is 10.15%.

About BLAIR WILLIAM & CO/IL and 13F Hedge Fund Stock Holdings

On 2026-05-08, the fund reported it's updated stock portfolio. In the 13F Holdings report, BLAIR WILLIAM & CO/IL reported an equity portfolio of $34.9 Billions as of 31 Mar, 2026.

The top stock holdings of BLAIR WILLIAM & CO/IL are AAPL, MSFT, AMZN. The fund has invested 4.3% of it's portfolio in APPLE INC and 3.7% of portfolio in MICROSOFT CORP.

The fund managers got completely rid off DYNAVAX TECHNOLOGIES CORP (DVAX), ASTRAZENECA PLC (AZN) and CYBERARK SOFTWARE LTD (CYBR) stocks. They significantly reduced their stock positions in ISHARES TR (AMPS), SUNOPTA INC (STKL) and CLEARWATER ANALYTICS HLDGS I (CWAN). BLAIR WILLIAM & CO/IL opened new stock positions in ASTRAZENECA PLC, SILICON MOTION TECHNOLOGY CO (SIMO) and GUARDANT HEALTH INC (GH). The fund showed a lot of confidence in some stocks as they added substantially to SPDR SERIES TRUST (BIL), ISHARES TR (DMXF) and ISHARES TR (IJR).
BLAIR WILLIAM & CO/IL Equity Portfolio Value
Last Reported on: 08 May, 2026

BLAIR WILLIAM & CO/IL Annual Return Estimates Vs S&P 500

Our best estimate is that BLAIR WILLIAM & CO/IL made a return of -5.74% in the last quarter. In trailing 12 months, it's portfolio return was 7.41%.
  • Performance
  • S&P 500

New Buys

Ticker$ Bought
astrazeneca plc19,844,600
silicon motion technology co11,586,000
guardant health inc9,573,600
New stocks bought by BLAIR WILLIAM & CO/IL

Additions

Ticker% Inc.
ishares tr7,425
medline inc2,325
digitalocean hldgs inc1,613
ishares tr880
abrdn platinum etf trust677
franco nev corp461
ati inc437
balchem corp408
Additions to existing portfolio by BLAIR WILLIAM & CO/IL

Reductions

Ticker% Reduced
procore technologies inc-78.84
spotify technology s a-75.33
workday inc-69.32
adobe inc-59.53
costar group inc-55.51
applovin corp-52.47
devon energy corp new-49.74
waste connections inc-48.02
BLAIR WILLIAM & CO/IL reduced stake in above stock

Sold off

None of the stocks were completely sold off by BLAIR WILLIAM & CO/IL

Sector Distribution

BLAIR WILLIAM & CO/IL has about 22.4% of it's holdings in Others sector.

  • Others
  • Technology
  • Industrials
  • Financial Services
  • Healthcare
  • Consumer Cyclical
  • Communication Services
  • Consumer Defensive
  • Energy
  • Basic Materials
Sector%
Others22.4
Technology21.1
Industrials11.9
Financial Services11
Healthcare10.2
Consumer Cyclical7.1
Communication Services6.9
Consumer Defensive4
Energy1.9
Basic Materials1.5

Market Cap. Distribution

BLAIR WILLIAM & CO/IL has about 74.7% of it's portfolio invested in the large-cap and mega-cap stocks.

  • MEGA-CAP
  • LARGE-CAP
  • UNALLOCATED
  • MID-CAP
Category%
MEGA-CAP38.5
LARGE-CAP36.2
UNALLOCATED22.4
MID-CAP2.5

Stocks belong to which Index?

About 68.7% of the stocks held by BLAIR WILLIAM & CO/IL either belong to S&P 500 or RUSSELL 2000 index.

  • S&P 500
  • Others
  • RUSSELL 2000
Index%
S&P 50066.3
Others31.2
RUSSELL 20002.4
Top 5 Winners (%)%
IBRX
immunitybio inc
283.4 %
KOS
kosmos energy ltd
206.2 %
sandisk corp
127.5 %
dianthus therapeutics inc
101.6 %
OCUP
opus genetics inc
91.9 %
Top 5 Winners ($)$
ge vernova inc
144.4 M
COST
costco wholesale corporation
69.9 M
XOM
exxon mobil corp
47.2 M
BWXT
bwx technologies inc
45.5 M
FAST
fastenal co
45.1 M
Top 5 Losers (%)%
OPFI
oppfi inc
-87.5 %
IMMP
immutep ltd
-69.8 %
PAR
par technology corp
-62.7 %
ALIT
alight inc
-60.9 %
SLQT
selectquote inc
-55.3 %
Top 5 Losers ($)$
MSFT
microsoft corp
-401.2 M
AMZN
amazon com inc
-136.7 M
IDXX
idexx labs inc
-111.6 M
AAPL
apple inc
-107.3 M
NOW
servicenow inc
-97.7 M

BLAIR WILLIAM & CO/IL Holdings Map

This heatmap illustrates the top 50 positions within the fund's portfolio.

Current Stock Holdings of BLAIR WILLIAM & CO/IL

BLAIR WILLIAM & CO/IL has 1890 stocks in it's portfolio. About 25.6% of the portfolio is in top 10 stocks. MSFT proved to be the most loss making stock for the portfolio. was the most profitable stock for BLAIR WILLIAM & CO/IL last quarter.

Last Reported on: 08 May, 2026
TickerNamesorted ascending% PortfolioShares Held$ ValueType% ChangeOptions