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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+1.99%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$29.4B
AUM Growth
+$519M
Cap. Flow
+$281M
Cap. Flow %
0.96%
Top 10 Hldgs %
23.58%
Holding
1,987
New
99
Increased
752
Reduced
666
Closed
108

Top Buys

Rank Stock Value
1
ABNB icon
Airbnb
ABNB
+$45.2M
2
CHWY icon
Chewy
CHWY
+$31.5M
3
U icon
Unity
U
+$23.3M
4
RYAN icon
Ryan Specialty Holdings
RYAN
+$22.4M
5
AMZN icon
Amazon
AMZN
+$21.5M

Top Sells

Rank Stock Value
1
IDXX icon
Idexx Laboratories
IDXX
+$37.7M
2
GD icon
General Dynamics
GD
+$33.5M
3
ECL icon
Ecolab
ECL
+$31.7M
4
JNJ icon
Johnson & Johnson
JNJ
+$20.9M
5
UBER icon
Uber
UBER
+$19.2M

Sector Composition

Rank Sector Weight
1 Technology 26.19%
2 Healthcare 19.81%
3 Financials 11.61%
4 Consumer Discretionary 10.68%
5 Industrials 9.37%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
COLI
801
DELISTED
Colicity Inc. Class A Common Stock
COLI
$1.38M ﹤0.01%
+141,169
New +$1.37M
CRON
802
Cronos Group
CRON
$1.16B
$1.37M ﹤0.01%
242,567
-200
-0.1% -$1.36K
HURN icon
803
Huron Consulting
HURN
$2.47B
$1.37M ﹤0.01%
+26,352
New +$1.28M
SCHF icon
804
Schwab International Equity ETF
SCHF
$69.3B
$1.37M ﹤0.01%
70,812
+30,486
+76% +$606K
IPG
805
DELISTED
Interpublic Group of Companies
IPG
$1.36M ﹤0.01%
37,171
-1,008
-3% -$36.1K
CIEN icon
806
Ciena
CIEN
$62.3B
$1.36M ﹤0.01%
26,458
-167
-0.6% -$9.28K
CIBR icon
807
First Trust NASDAQ Cybersecurity ETF
CIBR
$16B
$1.35M ﹤0.01%
27,775
+6,452
+30% +$319K
LH icon
808
Labcorp
LH
$26.2B
$1.35M ﹤0.01%
5,567
-182
-3% -$45.9K
IBDN
809
DELISTED
iShares iBonds Dec 2022 Term Corporate ETF
IBDN
$1.34M ﹤0.01%
52,860
+4,000
+8% +$101K
LL
810
DELISTED
LL Flooring Holdings, Inc.
LL
$1.33M ﹤0.01%
71,345
+20,750
+41% +$410K
GPC icon
811
Genuine Parts
GPC
$18.7B
$1.33M ﹤0.01%
10,934
-571
-5% -$71.2K
KSS icon
812
Kohl's
KSS
$2.21B
$1.32M ﹤0.01%
28,143
+203
+0.7% +$10.8K
CERT icon
813
Certara
CERT
$1.24B
$1.32M ﹤0.01%
39,985
-4,145
-9% -$125K
XSW icon
814
State Street SPDR S&P Software & Services ETF
XSW
$514M
$1.32M ﹤0.01%
7,708
-60
-0.8% -$10.4K
HPQ icon
815
HP
HPQ
$28.5B
$1.32M ﹤0.01%
48,115
+6,848
+17% +$197K
DTD icon
816
WisdomTree US Total Dividend Fund
DTD
$1.7B
$1.31M ﹤0.01%
22,276
+8
+0% +$484
BLDR icon
817
Builders FirstSource
BLDR
$7.97B
$1.3M ﹤0.01%
25,225
+460
+2% +$22.5K
ALLK
818
DELISTED
Allakos
ALLK
$1.3M ﹤0.01%
12,300
+3,185
+35% +$285K
IXN icon
819
iShares Global Tech ETF
IXN
$9.48B
$1.3M ﹤0.01%
22,891
+139
+0.6% +$8.14K
ACHC icon
820
Acadia Healthcare
ACHC
$2.82B
$1.3M ﹤0.01%
20,314
-1,686
-8% -$106K
DBEF icon
821
Xtrackers MSCI EAFE Hedged Equity ETF
DBEF
$9.45B
$1.3M ﹤0.01%
34,317
-2,000
-6% -$76.3K
GSK icon
822
GSK
GSK
$101B
$1.29M ﹤0.01%
27,091
-18,332
-40% -$921K
ARWR icon
823
Arrowhead Research
ARWR
$12.1B
$1.29M ﹤0.01%
20,702
-212
-1% -$13.7K
CDXS icon
824
Codexis
CDXS
$177M
$1.29M ﹤0.01%
55,325
– –
FRC
825
DELISTED
First Republic Bank
FRC
$1.28M ﹤0.01%
6,633
+1,478
+29% +$291K
31 32
33
34 35

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William Blair & Company's Q3 2021 Portfolio in Review

As of Q3 2021, William Blair & Company held 1,987 positions worth $29.4B, up 1.8% from $28.9B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

William Blair & Company's Q3 2021 filing shows 99 new, 752 increased, 666 reduced and 108 closed positions. Its largest new stake was Ryan Specialty Holdings: 709,555 shares worth $24M. The largest sale was Idexx Laboratories, an estimated $37.7M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, up from 26% a quarter earlier, followed by Healthcare and Financials.

  • William Blair & Company's largest Q3 2021 buy was Ryan Specialty Holdings: 709,555 shares worth $24M.
  • William Blair & Company added most to Airbnb in Q3 2021, an estimated $45.2M increase.
  • William Blair & Company's biggest Q3 2021 reduction was Idexx Laboratories, cutting an estimated $37.7M.
  • William Blair & Company fully exited Slack Technologies, Inc. in Q3 2021, selling an estimated $13.8M.
  • William Blair & Company's ten largest holdings make up 24% of its $29.4B portfolio in Q3 2021.
  • William Blair & Company opened 99 new positions and closed 108 in Q3 2021.
  • William Blair & Company's portfolio value rose 1.8% quarter-over-quarter to $29.4B.

Based on William Blair & Company's 13F filing for Q3 2021, filed 12 Nov 2021.