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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
AVIR icon
601
Atea Pharmaceuticals
AVIR
$424M
$2.9M 0.01%
82,813
+57,395
+226% +$1.59M
PFF icon
602
iShares Preferred and Income Securities ETF
PFF
$13.3B
$2.9M 0.01%
74,776
+1,148
+2% +$45K
EGRX
603
DELISTED
Eagle Pharmaceuticals, Inc.
EGRX
$2.89M 0.01%
51,827
-2,160
-4% -$106K
WCN
604
Waste Connections
WCN
$41.6B
$2.88M 0.01%
22,866
+441
+2% +$55.8K
IZRL icon
605
ARK Israel Innovative Technology ETF
IZRL
$140M
$2.84M 0.01%
97,105
-750
-0.8% -$22.7K
YUMC icon
606
Yum China
YUMC
$16.2B
$2.84M 0.01%
48,877
+36
+0.1% +$2.21K
LUV icon
607
Southwest Airlines
LUV
$22.2B
$2.84M 0.01%
55,145
-29,399
-35% -$1.48M
NSSC icon
608
Napco Security Technologies
NSSC
$1.38B
$2.81M 0.01%
130,626
+2,130
+2% +$39.9K
CPB icon
609
Campbell Soup
CPB
$6.93B
$2.81M 0.01%
67,262
-4,601
-6% -$200K
SGI
610
Somnigroup International
SGI
$13.7B
$2.81M 0.01%
60,596
+1,513
+3% +$66.1K
IYR icon
611
iShares US Real Estate ETF
IYR
$4.57B
$2.78M 0.01%
27,118
+8,776
+48% +$934K
EFX icon
612
Equifax
EFX
$21.2B
$2.78M 0.01%
10,955
+5,482
+100% +$1.42M
RGLD icon
613
Royal Gold
RGLD
$19.3B
$2.77M 0.01%
29,065
+30
+0.1% +$3.36K
PNC icon
614
PNC Financial Services
PNC
$102B
$2.77M 0.01%
14,135
-689
-5% -$130K
TRHC
615
DELISTED
Tabula Rasa HealthCare, Inc. Common Stock
TRHC
$2.74M 0.01%
104,526
+7,025
+7% +$259K
A icon
616
Agilent Technologies
A
$42B
$2.72M 0.01%
17,292
-500
-3% -$80.9K
SSTI icon
617
SoundThinking
SSTI
$105M
$2.71M 0.01%
74,412
+603
+0.8% +$25.3K
DMTK
618
DELISTED
DermTech, Inc. Common Stock
DMTK
$2.7M 0.01%
84,124
+39,394
+88% +$1.38M
PEN icon
619
Penumbra
PEN
$12.9B
$2.69M 0.01%
10,092
+213
+2% +$57.3K
IBB icon
620
iShares Biotechnology ETF
IBB
$9.83B
$2.68M 0.01%
16,566
+19
+0.1% +$3.2K
PARA
621
DELISTED
Paramount Global Class B
PARA
$2.67M 0.01%
67,595
+5,774
+9% +$235K
IYW icon
622
iShares US Technology ETF
IYW
$25.7B
$2.66M 0.01%
26,293
+135
+0.5% +$14.1K
VERU icon
623
Veru
VERU
$45.4M
$2.64M 0.01%
30,988
-5
-0% -$397
AVTR icon
624
Avantor
AVTR
$9.33B
$2.63M 0.01%
64,313
+10,683
+20% +$417K
HZNP
625
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
$2.63M 0.01%
24,010
-4,321
-15% -$449K
23 24
25
26 27

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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.