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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
MDB icon
76
MongoDB
MDB
$35.3B
$90.5M 0.31%
191,955
+4,356
+2% +$1.75M
ISRG icon
77
Intuitive Surgical
ISRG
$142B
$90.4M 0.31%
272,775
+6,009
+2% +$2.02M
VRSK icon
78
Verisk Analytics
VRSK
$23.4B
$89.1M 0.3%
444,914
-23,557
-5% -$4.56M
ROK icon
79
Rockwell Automation
ROK
$50.1B
$88.5M 0.3%
300,918
+9,901
+3% +$3.04M
VIG icon
80
Vanguard Dividend Appreciation ETF
VIG
$115B
$87.3M 0.3%
568,223
+3,155
+0.6% +$503K
ALGN icon
81
Align Technology
ALGN
$12.4B
$86.4M 0.29%
129,776
+208
+0.2% +$141K
TMO icon
82
Thermo Fisher Scientific
TMO
$223B
$86.1M 0.29%
150,765
-1,289
-0.8% -$707K
BRK.B icon
83
Berkshire Hathaway Class B
BRK.B
$1.09T
$85.7M 0.29%
314,155
+7,665
+3% +$2.15M
MCD icon
84
McDonald's
MCD
$195B
$85.1M 0.29%
353,071
+9,314
+3% +$2.22M
LIN icon
85
Linde
LIN
$222B
$83M 0.28%
282,827
-922
-0.3% -$280K
U icon
86
Unity
U
$19.4B
$79.5M 0.27%
629,398
+197,184
+46% +$23.3M
EVH icon
87
Evolent Health
EVH
$481M
$79.3M 0.27%
2,558,185
+39,296
+2% +$943K
NKE icon
88
Nike
NKE
$60.4B
$79.2M 0.27%
545,413
+3,874
+0.7% +$632K
RMD icon
89
ResMed
RMD
$32.8B
$78.9M 0.27%
299,428
+4,934
+2% +$1.35M
NFLX icon
90
Netflix
NFLX
$309B
$78M 0.27%
1,278,680
+22,820
+2% +$1.26M
TRMB icon
91
Trimble
TRMB
$13.2B
$75.3M 0.26%
915,329
+23,909
+3% +$2.1M
XYZ
92
Block Inc
XYZ
$46.7B
$75.2M 0.26%
313,695
+11,603
+4% +$2.98M
BMY icon
93
Bristol-Myers Squibb
BMY
$131B
$74.6M 0.25%
1,260,503
-174,033
-12% -$11.5M
MCHP icon
94
Microchip Technology
MCHP
$43.4B
$74.2M 0.25%
966,606
+9,778
+1% +$733K
GNRC icon
95
Generac Holdings
GNRC
$13.1B
$73.6M 0.25%
180,061
+5,266
+3% +$2.26M
ATVI
96
DELISTED
Activision Blizzard
ATVI
$73.2M 0.25%
946,025
-64,164
-6% -$5.36M
ROKU icon
97
Roku
ROKU
$22.5B
$71.3M 0.24%
227,628
+28,400
+14% +$10.7M
ZBRA icon
98
Zebra Technologies
ZBRA
$18.1B
$69.7M 0.24%
135,252
-1,653
-1% -$921K
PEP icon
99
PepsiCo
PEP
$189B
$69.7M 0.24%
463,128
+1,108
+0.2% +$172K
INFO
100
DELISTED
IHS Markit Ltd. Common Shares
INFO
$68.9M 0.23%
590,826
+13,761
+2% +$1.62M
2 3
4
5 6

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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.