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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $33.3B
1-Year Est. Return 44.76%
This Fund
S&P 500
This Quarter Est. Return
+5.82%
1 Year Est. Return
+44.76%
3 Year Est. Return
+140.8%
5 Year Est. Return
+166.51%
10 Year Est. Return
+978.6%
AUM
$30.9B
AUM Growth
+$843M
Cap. Flow
-$358M
Cap. Flow %
-1.16%
Top 10 Hldgs %
16.89%
Holding
389
New
33
Increased
152
Reduced
179
Closed
22

Top Buys

Rank Stock Value
1
CRL icon
Charles River Laboratories
CRL
+$239M
2
RYAAY icon
Ryanair
RYAAY
+$210M
3
DT icon
Dynatrace
DT
+$201M
4
CERT icon
Certara
CERT
+$155M
5
LESL icon
Leslie's
LESL
+$148M

Top Sells

Rank Stock Value
1
SEDG icon
SolarEdge
SEDG
+$265M
2
TSM icon
TSMC
TSM
+$235M
3
STE icon
Steris
STE
+$187M
4
MDB icon
MongoDB
MDB
+$173M
5
ETSY icon
Etsy
ETSY
+$170M

Sector Composition

Rank Sector Weight
1 Technology 24.51%
2 Healthcare 21.08%
3 Industrials 14.45%
4 Consumer Discretionary 12.96%
5 Financials 7.5%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
Z icon
251
Zillow
Z
$7.48B
$14.1M 0.05%
108,658
-3,185
-3% -$473K
SITM icon
252
SiTime
SITM
$20.5B
$14.1M 0.05%
142,693
+10,944
+8% +$1.28M
COLD icon
253
Americold
COLD
$4.17B
$13.9M 0.05%
361,965
-137,751
-28% -$4.95M
MTD icon
254
Mettler-Toledo International
MTD
$28.8B
$13.7M 0.04%
11,881
-345
-3% -$400K
HWC icon
255
Hancock Whitney
HWC
$6.34B
$13.6M 0.04%
324,909
-189,893
-37% -$7.47M
ROK icon
256
Rockwell Automation
ROK
$50.1B
$13.4M 0.04%
50,586
-1,555
-3% -$397K
AMBR
257
Amber International Holding Ltd
AMBR
$124M
$13.4M 0.04%
+114,024
New +$15.7M
VCEL icon
258
Vericel Corp
VCEL
$2.29B
$13.2M 0.04%
+238,331
New +$10.8M
DECK icon
259
Deckers Outdoor
DECK
$12.4B
$12.7M 0.04%
231,366
-135,114
-37% -$7.21M
BLD
260
DELISTED
TopBuild
BLD
$12.7M 0.04%
60,686
-35,517
-37% -$7.22M
WSC icon
261
WillScot Mobile Mini Holdings
WSC
$4B
$12.7M 0.04%
456,578
+46,819
+11% +$1.23M
JLL icon
262
Jones Lang LaSalle
JLL
$16.7B
$12.5M 0.04%
69,835
+7,163
+11% +$1.17M
SKIN icon
263
SkinHealth Systems
SKIN
$84.2M
$12.2M 0.04%
+1,129,063
New +$12.4M
SIGI icon
264
Selective Insurance
SIGI
$5.59B
$12.1M 0.04%
167,303
-97,947
-37% -$6.82M
EWZ icon
265
iShares MSCI Brazil ETF
EWZ
$8.57B
$12.1M 0.04%
360,600
+302,200
+517% +$10.5M
ITGR icon
266
Integer Holdings
ITGR
$4.25B
$11.9M 0.04%
129,153
-57,420
-31% -$4.85M
RDN icon
267
Radian Group
RDN
$4.87B
$11.9M 0.04%
511,037
-299,174
-37% -$6.37M
CW icon
268
Curtiss-Wright
CW
$26.7B
$11.7M 0.04%
98,775
-57,715
-37% -$6.68M
IPAR icon
269
Interparfums
IPAR
$3.78B
$11.7M 0.04%
164,728
-18,989
-10% -$1.29M
FOLD
270
DELISTED
Amicus Therapeutics
FOLD
$11.5M 0.04%
1,160,724
+89,073
+8% +$1.38M
PRMW
271
DELISTED
Primo Water Corporation
PRMW
$11.5M 0.04%
704,731
+72,256
+11% +$1.16M
AON icon
272
Aon
AON
$74.7B
$11.3M 0.04%
49,228
-1,495
-3% -$329K
WTS icon
273
Watts Water Technologies
WTS
$12.9B
$11.3M 0.04%
95,037
-55,499
-37% -$6.77M
DPZ icon
274
Domino's
DPZ
$11.7B
$11.2M 0.04%
30,429
-922
-3% -$340K
GTLS
275
DELISTED
Chart Industries
GTLS
$11.1M 0.04%
78,235
-45,613
-37% -$6.44M
9 10
11
12 13

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William Blair Investment Management's Q1 2021 Portfolio in Review

As of Q1 2021, William Blair Investment Management held 389 positions worth $30.9B, up 2.8% from $30B the previous quarter. Its ten largest holdings account for 17% of the portfolio.

William Blair Investment Management's Q1 2021 filing shows 33 new, 152 increased, 179 reduced and 22 closed positions. Its largest new stake was Dynatrace: 4,138,525 shares worth $200M. The largest sale was SolarEdge, an estimated $265M.

By sector, the portfolio is most concentrated in Technology at 25% of assets, down from 27% a quarter earlier, followed by Healthcare and Industrials.

  • William Blair Investment Management's largest Q1 2021 buy was Dynatrace: 4,138,525 shares worth $200M.
  • William Blair Investment Management added most to Charles River Laboratories in Q1 2021, an estimated $239M increase.
  • William Blair Investment Management's biggest Q1 2021 reduction was TSMC, cutting an estimated $235M.
  • William Blair Investment Management fully exited SolarEdge in Q1 2021, selling an estimated $265M.
  • William Blair Investment Management's ten largest holdings make up 17% of its $30.9B portfolio in Q1 2021.
  • William Blair Investment Management opened 33 new positions and closed 22 in Q1 2021.
  • William Blair Investment Management's portfolio value rose 2.8% quarter-over-quarter to $30.9B.

Based on William Blair Investment Management's 13F filing for Q1 2021, filed 13 May 2021.