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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
ACRS icon
1501
Aclaris Therapeutics
ACRS
$860M
$181K ﹤0.01%
+10,050
New +$161K
OIH icon
1502
VanEck Oil Services ETF
OIH
$1.96B
$180K ﹤0.01%
914
+814
+814% +$155K
SRLN icon
1503
State Street Blackstone Senior Loan ETF
SRLN
$5.37B
$180K ﹤0.01%
3,922
+675
+21% +$31K
TEVA icon
1504
Teva Pharmaceuticals
TEVA
$42.8B
$179K ﹤0.01%
18,350
– –
AG icon
1505
First Majestic Silver
AG
$9.44B
$178K ﹤0.01%
15,768
+900
+6% +$11.6K
CTLP
1506
DELISTED
Cantaloupe
CTLP
$178K ﹤0.01%
16,485
-1,500
-8% -$15.5K
INDA icon
1507
iShares MSCI India ETF
INDA
$6.58B
$178K ﹤0.01%
3,650
– –
BWX icon
1508
State Street SPDR Bloomberg International Treasury Bond ETF
BWX
$1.31B
$177K ﹤0.01%
6,155
– –
UA icon
1509
Under Armour Class C
UA
$2.2B
$176K ﹤0.01%
10,060
-88
-0.9% -$1.69K
EUFN icon
1510
iShares MSCI Europe Financials ETF
EUFN
$4.29B
$174K ﹤0.01%
8,866
-561
-6% -$11.1K
FPX icon
1511
First Trust US Equity Opportunities ETF
FPX
$1.53B
$174K ﹤0.01%
1,410
– –
SBIO icon
1512
ALPS Medical Breakthroughs ETF
SBIO
$217M
$174K ﹤0.01%
+3,824
New +$176K
GRFS
1513
Grifois
GRFS
$5.4B
$173K ﹤0.01%
11,874
– –
CLLS
1514
Cellectis
CLLS
$296M
$172K ﹤0.01%
13,650
-1,500
-10% -$20.8K
KIE icon
1515
State Street SPDR S&P Insurance ETF
KIE
$676M
$169K ﹤0.01%
4,475
– –
BBH icon
1516
VanEck Biotech ETF
BBH
$429M
$168K ﹤0.01%
833
+8
+1% +$1.68K
EAGG icon
1517
iShares ESG Aware US Aggregate Bond ETF
EAGG
$4.97B
$166K ﹤0.01%
3,016
-3,797
-56% -$211K
EWA icon
1518
iShares MSCI Australia ETF
EWA
$1.46B
$162K ﹤0.01%
6,530
-4
-0.1% -$103
TEF
1519
DELISTED
Telefonica
TEF
$162K ﹤0.01%
+36,846
New +$164K
EEMV icon
1520
iShares MSCI Emerging Markets Min Vol Factor ETF
EEMV
$3.6B
$161K ﹤0.01%
2,570
– –
IMTB icon
1521
iShares Core 5-10 Year USD Bond ETF
IMTB
$275M
$161K ﹤0.01%
3,145
– –
SWN
1522
DELISTED
Southwestern Energy Company
SWN
$161K ﹤0.01%
29,035
– –
INN
1523
Summit Hotel Properties
INN
$655M
$160K ﹤0.01%
16,644
– –
PWB icon
1524
Invesco Large Cap Growth ETF
PWB
$2.43B
$160K ﹤0.01%
2,157
– –
SHE icon
1525
State Street SPDR MSCI USA Gender Diversity ETF
SHE
$337M
$160K ﹤0.01%
1,583
+1
+0.1% +$104
59 60
61
62 63

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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.