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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
HOMB icon
151
Home BancShares
HOMB
$6.27B
$44.8M 0.15%
1,656,479
-202,151
-11% -$4.86M
A icon
152
Agilent Technologies
A
$42.2B
$44.7M 0.14%
351,238
-11,425
-3% -$1.41M
ROP icon
153
Roper Technologies
ROP
$39.3B
$43.5M 0.14%
107,941
+1,266
+1% +$508K
LHCG
154
DELISTED
LHC Group LLC
LHCG
$43.1M 0.14%
225,156
+19,934
+10% +$3.99M
ECPG icon
155
Encore Capital Group
ECPG
$2.15B
$41.3M 0.13%
1,026,421
+86,674
+9% +$3.08M
QNST icon
156
QuinStreet
QNST
$1.19B
$41.2M 0.13%
2,028,563
-155,614
-7% -$3.5M
GOOG icon
157
Alphabet (Google) Class C
GOOG
$4.21T
$41.1M 0.13%
397,480
-8,480
-2% -$841K
STNE icon
158
StoneCo
STNE
$2.49B
$40.2M 0.13%
657,209
-88,717
-12% -$6.92M
ISRG icon
159
Intuitive Surgical
ISRG
$142B
$39.9M 0.13%
162,036
+5,412
+3% +$1.36M
ONT
160
Onterris Inc
ONT
$615M
$39M 0.13%
777,065
+28,705
+4% +$1.21M
PLOW icon
161
Douglas Dynamics
PLOW
$967M
$38.8M 0.13%
841,518
+70,711
+9% +$3.26M
EW icon
162
Edwards Lifesciences
EW
$53.4B
$38.8M 0.13%
464,156
+4,469
+1% +$378K
HCAT icon
163
Health Catalyst
HCAT
$132M
$38.2M 0.12%
817,018
+62,581
+8% +$3.03M
STE icon
164
Steris
STE
$23B
$37.9M 0.12%
198,794
-1,008,083
-84% -$187M
ILMN icon
165
Illumina
ILMN
$29.1B
$37.3M 0.12%
99,922
+409
+0.4% +$167K
LIN icon
166
Linde
LIN
$220B
$37M 0.12%
131,901
+2,645
+2% +$686K
ECL icon
167
Ecolab
ECL
$77.4B
$36.8M 0.12%
171,701
+2,364
+1% +$503K
RVLV icon
168
Revolve Group
RVLV
$1.72B
$36.2M 0.12%
806,794
-361,516
-31% -$14.7M
CCMP
169
DELISTED
CMC Materials, Inc. Common Stock
CCMP
$36.1M 0.12%
203,956
+17,701
+10% +$2.94M
KRNT icon
170
Kornit Digital
KRNT
$827M
$35.4M 0.11%
+357,151
New +$35.3M
GBCI icon
171
Glacier Bancorp
GBCI
$6.48B
$34.2M 0.11%
598,483
-15,426
-3% -$833K
RSI icon
172
Rush Street Interactive
RSI
$2.85B
$32.9M 0.11%
2,016,022
+110,734
+6% +$2.13M
NEE icon
173
NextEra Energy
NEE
$179B
$32.6M 0.11%
430,619
+9,162
+2% +$715K
CDNS icon
174
Cadence Design Systems
CDNS
$89.2B
$32.4M 0.1%
236,557
-7,333
-3% -$984K
PAE
175
DELISTED
PAE Incorporated Class A Common Stock
PAE
$31.6M 0.1%
3,503,156
+270,726
+8% +$2.41M
5 6
7
8 9

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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.