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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
BOOT icon
126
Boot Barn
BOOT
$4.9B
$61M 0.2%
979,468
-263,834
-21% -$15.5M
UNP icon
127
Union Pacific
UNP
$174B
$58.5M 0.19%
265,312
+35,403
+15% +$7.43M
DEN
128
DELISTED
Denbury Inc.
DEN
$58.2M 0.19%
+1,214,257
New +$44.5M
CPNG icon
129
Coupang
CPNG
$29.6B
$57.8M 0.19%
+1,171,533
New +$54.2M
LMT icon
130
Lockheed Martin
LMT
$140B
$57.7M 0.19%
156,040
+65,242
+72% +$22.4M
LXFR icon
131
Luxfer Holdings
LXFR
$457M
$56.7M 0.18%
2,663,512
+962,915
+57% +$18.1M
BLK icon
132
Blackrock
BLK
$179B
$56.5M 0.18%
74,888
+911
+1% +$661K
ABT icon
133
Abbott
ABT
$192B
$55.8M 0.18%
466,020
-101,510
-18% -$12M
DCO icon
134
Ducommun
DCO
$3.06B
$55.6M 0.18%
927,455
+59,000
+7% +$3.3M
EFX icon
135
Equifax
EFX
$21.2B
$55.1M 0.18%
304,038
-17,314
-5% -$3.06M
GOOS
136
Canada Goose Holdings
GOOS
$844M
$54.4M 0.18%
+1,385,831
New +$54.8M
CDXS icon
137
Codexis
CDXS
$172M
$53.9M 0.17%
2,353,106
+202,257
+9% +$4.73M
TMO icon
138
Thermo Fisher Scientific
TMO
$222B
$53M 0.17%
116,196
+1,489
+1% +$711K
GDYN icon
139
Grid Dynamics Holdings
GDYN
$625M
$52.5M 0.17%
3,295,809
-305,276
-8% -$4.39M
HNGR
140
DELISTED
Hanger Inc.
HNGR
$52.4M 0.17%
2,295,272
+193,781
+9% +$4.44M
EWBC icon
141
East-West Bancorp
EWBC
$18.5B
$51.9M 0.17%
703,565
+43,872
+7% +$2.98M
OEC icon
142
Orion
OEC
$367M
$51.7M 0.17%
2,619,457
+220,052
+9% +$3.96M
INMD icon
143
InMode
INMD
$875M
$50.9M 0.16%
+1,405,720
New +$45.6M
CWST icon
144
Casella Waste Systems
CWST
$5.83B
$50.6M 0.16%
795,807
+64,819
+9% +$3.92M
APO icon
145
Apollo Global Management
APO
$82B
$49.6M 0.16%
1,055,310
+73,253
+7% +$3.56M
MAR icon
146
Marriott International
MAR
$92.6B
$49.5M 0.16%
334,547
+108,936
+48% +$14.9M
LPLA icon
147
LPL Financial
LPLA
$29.5B
$49.1M 0.16%
345,072
+27,679
+9% +$3.53M
ICE icon
148
Intercontinental Exchange
ICE
$84.8B
$47.4M 0.15%
424,328
+4,023
+1% +$456K
HHR
149
DELISTED
HeadHunter Group PLC American Depositary Shares
HHR
$47M 0.15%
1,385,497
+1,175,449
+560% +$37.8M
IDXX icon
150
Idexx Laboratories
IDXX
$45.1B
$46.6M 0.15%
95,238
-14,203
-13% -$7.12M
4 5
6
7 8

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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.