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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
NUVA
1076
DELISTED
NuVasive, Inc.
NUVA
$626K ﹤0.01%
10,461
-303
-3% -$18.7K
VPL icon
1077
Vanguard FTSE Pacific ETF
VPL
$8.65B
$625K ﹤0.01%
7,710
-317
-4% -$26.1K
MANT
1078
DELISTED
Mantech International Corp
MANT
$623K ﹤0.01%
8,204
+3
+0% +$246
RDS.B
1079
DELISTED
Royal Dutch Shell PLC ADS Class B
RDS.B
$619K ﹤0.01%
13,989
-27
-0.2% -$1.07K
EXG icon
1080
Eaton Vance Tax-Managed Global Diversified Equity Income Fund
EXG
$3.09B
$617K ﹤0.01%
61,788
– –
ICVT icon
1081
iShares Convertible Bond ETF
ICVT
$7.64B
$617K ﹤0.01%
6,191
– –
PEG icon
1082
Public Service Enterprise Group
PEG
$37.8B
$616K ﹤0.01%
10,112
+348
+4% +$21.7K
HYG icon
1083
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$17.9B
$615K ﹤0.01%
7,026
-1,893
-21% -$166K
SDC
1084
DELISTED
SmileDirectClub, Inc. Class A Common Stock
SDC
$615K ﹤0.01%
115,532
-356,830
-76% -$2.22M
AXSM icon
1085
Axsome Therapeutics
AXSM
$11.2B
$612K ﹤0.01%
18,577
+10,050
+118% +$392K
LOPE icon
1086
Grand Canyon Education
LOPE
$3.79B
$612K ﹤0.01%
6,960
-561
-7% -$50K
APP icon
1087
Applovin
APP
$105B
$605K ﹤0.01%
+8,357
New +$568K
IR icon
1088
Ingersoll Rand
IR
$32.7B
$601K ﹤0.01%
11,913
-160
-1% -$8.14K
MGEE icon
1089
MGE Energy Inc
MGEE
$3.06B
$598K ﹤0.01%
8,142
– –
PNQI icon
1090
Invesco NASDAQ Internet ETF
PNQI
$544M
$596K ﹤0.01%
12,500
-1,500
-11% -$75.5K
GTIP icon
1091
Goldman Sachs Access Inflation Protected USD Bond ETF
GTIP
$296M
$595K ﹤0.01%
10,298
+180
+2% +$10.5K
NI icon
1092
NiSource
NI
$20.2B
$594K ﹤0.01%
24,533
+144
+0.6% +$3.59K
WLKP icon
1093
Westlake Chemical Partners
WLKP
$764M
$593K ﹤0.01%
24,350
-2,500
-9% -$65.4K
MTW icon
1094
Manitowoc
MTW
$753M
$590K ﹤0.01%
27,532
– –
COHU icon
1095
Cohu
COHU
$2.76B
$589K ﹤0.01%
18,428
– –
GXO icon
1096
GXO Logistics
GXO
$5.56B
$587K ﹤0.01%
+7,489
New +$587K
FBIN icon
1097
Fortune Brands Innovations
FBIN
$5.78B
$585K ﹤0.01%
7,660
-83
-1% -$6.9K
VTRS icon
1098
Viatris
VTRS
$18.4B
$580K ﹤0.01%
42,784
-22,684
-35% -$322K
WWD icon
1099
Woodward
WWD
$21.2B
$578K ﹤0.01%
5,106
+47
+0.9% +$5.58K
IRIX icon
1100
IRIDEX
IRIX
$14.3M
$575K ﹤0.01%
+75,000
New +$526K
42 43
44
45 46

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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.