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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
+1.99%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
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
MSFT icon
1
Microsoft
MSFT
$2.93T
$1.05B 3.56%
3,710,584
+41,534
+1% +$12.1M
AAPL icon
2
Apple
AAPL
$4.99T
$918M 3.13%
6,488,626
+93,565
+1% +$13.8M
AMZN icon
3
Amazon
AMZN
$2.45T
$877M 2.99%
5,341,360
+124,920
+2% +$21.5M
IDXX icon
4
Idexx Laboratories
IDXX
$44.9B
$805M 2.74%
1,293,903
-56,062
-4% -$37.7M
DXCM icon
5
DexCom
DXCM
$29.3B
$658M 2.24%
4,812,308
-14,820
-0.3% -$1.87M
PYPL icon
6
PayPal
PYPL
$50.3B
$581M 1.98%
2,233,762
+26,520
+1% +$7.52M
GOOG icon
7
Alphabet (Google) Class C
GOOG
$4.07T
$524M 1.79%
3,935,560
+26,380
+0.7% +$3.64M
VEEV icon
8
Veeva Systems
VEEV
$33.8B
$522M 1.78%
1,812,288
-37,898
-2% -$12M
V icon
9
Visa
V
$707B
$516M 1.76%
2,317,354
+3,501
+0.2% +$821K
DHR icon
10
Danaher
DHR
$141B
$479M 1.63%
1,773,699
-43,175
-2% -$11.8M
ZTS icon
11
Zoetis
ZTS
$33B
$470M 1.6%
2,421,542
-14,435
-0.6% -$2.91M
DOCU
12
DocuSign
DOCU
$11B
$443M 1.51%
1,721,802
+63,498
+4% +$18.3M
MA icon
13
Mastercard
MA
$501B
$427M 1.45%
1,229,264
+33,662
+3% +$12.2M
SBUX icon
14
Starbucks
SBUX
$118B
$409M 1.39%
3,710,110
-28,553
-0.8% -$3.34M
ADBE icon
15
Adobe
ADBE
$104B
$381M 1.3%
661,848
-17,056
-3% -$10.7M
WDAY icon
16
Workday
WDAY
$41B
$373M 1.27%
1,491,930
+35,576
+2% +$8.81M
GOOGL icon
17
Alphabet (Google) Class A
GOOGL
$4.09T
$330M 1.12%
2,465,660
+18,440
+0.8% +$2.51M
CRM icon
18
Salesforce
CRM
$153B
$299M 1.02%
1,101,775
+68,708
+7% +$17.4M
JPM icon
19
JPMorgan Chase
JPM
$931B
$271M 0.92%
1,656,823
+37,097
+2% +$5.82M
KMX icon
20
CarMax
KMX
$8.65B
$270M 0.92%
2,112,281
+37,289
+2% +$4.96M
ECL icon
21
Ecolab
ECL
$79B
$262M 0.89%
1,257,912
-144,587
-10% -$31.7M
INTU icon
22
Intuit
INTU
$90.2B
$242M 0.82%
448,365
+2,163
+0.5% +$1.17M
CSGP icon
23
CoStar Group
CSGP
$12B
$234M 0.8%
2,723,906
+48,540
+2% +$4.2M
SPY icon
24
State Street SPDR S&P 500 ETF Trust
SPY
$777B
$234M 0.8%
544,241
+10,805
+2% +$4.77M
ABT icon
25
Abbott
ABT
$191B
$215M 0.73%
1,817,590
+46,776
+3% +$5.75M
1
2 3 4 5

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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.