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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
MEDP icon
551
Medpace
MEDP
$16.7B
$3.41M 0.01%
18,023
-15
-0.1% -$2.74K
VFC icon
552
VF Corp
VFC
$5.73B
$3.41M 0.01%
50,897
+363
+0.7% +$27.9K
AMP icon
553
Ameriprise Financial
AMP
$49.9B
$3.39M 0.01%
12,843
+294
+2% +$76.9K
MPWR icon
554
Monolithic Power Systems
MPWR
$70B
$3.38M 0.01%
6,983
-3,273
-32% -$1.49M
VOOV icon
555
Vanguard S&P 500 Value ETF
VOOV
$6.77B
$3.38M 0.01%
24,068
-319
-1% -$46K
BMRN icon
556
BioMarin Pharmaceuticals
BMRN
$13.6B
$3.37M 0.01%
43,640
-1,875
-4% -$148K
DSI icon
557
iShares MSCI KLD 400 Social ETF
DSI
$5.54B
$3.33M 0.01%
39,968
-15,269
-28% -$1.31M
K
558
DELISTED
Kellanova
K
$3.32M 0.01%
55,337
+3,942
+8% +$236K
MLM icon
559
Martin Marietta Materials
MLM
$32.7B
$3.31M 0.01%
9,684
-1,418
-13% -$516K
VTIP icon
560
Vanguard Short-Term Inflation-Protected Securities Index Fund
VTIP
$19.8B
$3.3M 0.01%
62,703
-1,130
-2% -$59.3K
TTE icon
561
TotalEnergies
TTE
$194B
$3.29M 0.01%
68,701
-2,486
-3% -$110K
TASK icon
562
TaskUs
TASK
$634M
$3.29M 0.01%
+49,600
New +$2.35M
MAX icon
563
MediaAlpha
MAX
$787M
$3.27M 0.01%
175,121
+18,041
+11% +$488K
PDP icon
564
Invesco Dorsey Wright Momentum ETF
PDP
$1.52B
$3.27M 0.01%
36,500
-60
-0.2% -$5.52K
CARR icon
565
Carrier Global
CARR
$52B
$3.26M 0.01%
63,065
+9,728
+18% +$524K
AMRC icon
566
Ameresco
AMRC
$1.47B
$3.26M 0.01%
55,848
+19,830
+55% +$1.31M
PODD icon
567
Insulet
PODD
$10.1B
$3.26M 0.01%
11,481
-225
-2% -$64.2K
EQR icon
568
Equity Residential
EQR
$24.2B
$3.25M 0.01%
40,201
+11,871
+42% +$980K
LESL icon
569
Leslie's
LESL
$12.4M
$3.25M 0.01%
7,909
-586
-7% -$281K
KBE icon
570
State Street SPDR S&P Bank ETF
KBE
$1.74B
$3.24M 0.01%
61,265
+522
+0.9% +$26.5K
AEP icon
571
American Electric Power
AEP
$67.9B
$3.23M 0.01%
39,851
-585
-1% -$51.1K
ASTR
572
DELISTED
Astra Space, Inc. Class A Common Stock
ASTR
$3.19M 0.01%
+24,458
New +$3.74M
PGX icon
573
Invesco Preferred ETF
PGX
$3.76B
$3.17M 0.01%
211,235
+98,338
+87% +$1.49M
AIZ icon
574
Assurant
AIZ
$13.9B
$3.17M 0.01%
+20,089
New +$3.24M
ZEN
575
DELISTED
ZENDESK INC
ZEN
$3.13M 0.01%
26,880
-6,258
-19% -$808K
21 22
23
24 25

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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.