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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
NTES icon
351
NetEase
NTES
$79.5B
$3.27M 0.01%
31,670
-6,235
-16% -$706K
KMX icon
352
CarMax
KMX
$8.33B
$3.2M 0.01%
24,133
– –
MDRX
353
DELISTED
Veradigm Inc. Common Stock
MDRX
$3.14M 0.01%
+209,263
New +$3.35M
SMTC icon
354
Semtech
SMTC
$13B
$3.02M 0.01%
43,813
-25,631
-37% -$1.88M
IBN icon
355
ICICI Bank
IBN
$107B
$2.96M 0.01%
185,171
-102,203
-36% -$1.67M
BABA icon
356
Alibaba
BABA
$300B
$2.78M 0.01%
12,270
-135
-1% -$33.2K
NVR icon
357
NVR
NVR
$16.8B
$2.63M 0.01%
558
-125
-18% -$561K
XLU icon
358
State Street Utilities Select Sector SPDR ETF
XLU
$22.8B
$2.6M 0.01%
81,280
-9,200
-10% -$285K
DCI icon
359
Donaldson
DCI
$11.2B
$2.14M 0.01%
36,849
– –
INDA icon
360
iShares MSCI India ETF
INDA
$6.58B
$1.63M 0.01%
+38,700
New +$1.62M
BAH icon
361
Booz Allen Hamilton
BAH
$9.43B
$1.6M 0.01%
19,842
-1,492,585
-99% -$125M
ANET icon
362
Arista Networks
ANET
$265B
$1.3M ﹤0.01%
69,024
-2,296,016
-97% -$42.9M
HUM icon
363
Humana
HUM
$46.7B
$949K ﹤0.01%
+2,264
New +$904K
SIVB
364
DELISTED
SVB Financial Group
SIVB
$477K ﹤0.01%
966
-1,009
-51% -$496K
DIS icon
365
Walt Disney
DIS
$178B
$461K ﹤0.01%
+2,496
New +$460K
IWP icon
366
iShares Russell Mid-Cap Growth ETF
IWP
$21B
$360K ﹤0.01%
3,530
+1,740
+97% +$182K
EMB icon
367
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$14.9B
$59K ﹤0.01%
540
+100
+23% +$11.2K
AGYS icon
368
Agilysys
AGYS
$3.03B
– –
-294,943
Closed -$11.3M
CAG icon
369
Conagra Brands
CAG
$7.16B
– –
-360,189
Closed -$13.1M
EFA icon
370
iShares MSCI EAFE ETF
EFA
$80.2B
– –
-6,438
Closed -$470K
ELD icon
371
WisdomTree Emerging Markets Local Debt Fund
ELD
$143M
– –
-1,540
Closed -$54K
EPI icon
372
WisdomTree India Earnings Fund ETF
EPI
$2.04B
– –
-315,717
Closed -$9.22M
FND icon
373
Floor & Decor
FND
$6.32B
– –
-160,144
Closed -$14.9M
HRMY icon
374
Harmony Biosciences
HRMY
$2.32B
– –
-154,012
Closed -$5.57M
IPG
375
DELISTED
Interpublic Group of Companies
IPG
– –
-176,963
Closed -$4.16M
12 13 14
15
16

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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.