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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
BPMC
101
DELISTED
Blueprint Medicines
BPMC
$103M 0.33%
1,059,271
+76,457
+8% +$7.63M
MASI
102
DELISTED
Masimo
MASI
$101M 0.33%
438,283
-1,161
-0.3% -$292K
ACN icon
103
Accenture
ACN
$109B
$96.8M 0.31%
350,570
+29,572
+9% +$7.64M
LRCX icon
104
Lam Research
LRCX
$411B
$89.3M 0.29%
1,500,480
+100,210
+7% +$5.46M
WIX icon
105
WIX.com
WIX
$2.75B
$89M 0.29%
318,572
+80,431
+34% +$23M
ICLR icon
106
Icon
ICLR
$12.9B
$87.9M 0.28%
447,815
-31,472
-7% -$6.21M
QTWO icon
107
Q2 Holdings
QTWO
$3.86B
$87.5M 0.28%
+872,889
New +$109M
SYK icon
108
Stryker
SYK
$132B
$87.4M 0.28%
358,613
+38,884
+12% +$9.32M
BAP icon
109
Credicorp
BAP
$29.8B
$85.8M 0.28%
628,220
-46,039
-7% -$7.15M
AMD icon
110
Advanced Micro Devices
AMD
$795B
$83.4M 0.27%
1,062,326
+74,262
+8% +$6.39M
TWST icon
111
Twist Bioscience
TWST
$7.81B
$81.2M 0.26%
655,960
-95,295
-13% -$14.5M
META icon
112
Meta Platforms (Facebook)
META
$1.48T
$80.2M 0.26%
272,198
-13,784
-5% -$3.71M
SBUX icon
113
Starbucks
SBUX
$123B
$78.7M 0.25%
719,937
+74,230
+11% +$7.79M
BFLY icon
114
Butterfly Network
BFLY
$2.47B
$78.4M 0.25%
+4,659,536
New +$92.2M
APTV icon
115
Aptiv
APTV
$10.1B
$77.8M 0.25%
564,526
-66,140
-10% -$9.62M
CELH icon
116
Celsius Holdings
CELH
$6.94B
$76.8M 0.25%
+4,796,133
New +$90.1M
COST icon
117
Costco
COST
$421B
$76M 0.25%
215,550
+35,925
+20% +$12.5M
ULTA icon
118
Ulta Beauty
ULTA
$23.1B
$74.8M 0.24%
241,911
-319,753
-57% -$99.4M
CSGP icon
119
CoStar Group
CSGP
$12.4B
$74.6M 0.24%
908,070
-11,010
-1% -$951K
INTU icon
120
Intuit
INTU
$91B
$73.6M 0.24%
192,169
+19,926
+12% +$7.67M
FTV icon
121
Fortive
FTV
$18.5B
$71.5M 0.23%
1,343,310
+222,229
+20% +$11.5M
WDAY icon
122
Workday
WDAY
$43.1B
$67.2M 0.22%
270,623
-14,773
-5% -$3.65M
ATVI
123
DELISTED
Activision Blizzard
ATVI
$65.9M 0.21%
708,414
-73,082
-9% -$6.87M
SKY icon
124
Champion Homes
SKY
$5.09B
$62.8M 0.2%
1,388,071
+99,173
+8% +$3.98M
VRRM icon
125
Verra Mobility
VRRM
$717M
$62.5M 0.2%
4,614,040
+1,426,136
+45% +$19.8M
3 4
5
6 7

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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.