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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
CPK icon
326
Chesapeake Utilities
CPK
$3.25B
$7M 0.02%
60,277
-35,191
-37% -$3.8M
PAR icon
327
PAR Technology
PAR
$741M
$6.97M 0.02%
106,572
-106,719
-50% -$7.93M
KBH icon
328
KB Home
KBH
$3.42B
$6.95M 0.02%
149,277
-87,097
-37% -$3.6M
ASML icon
329
ASML
ASML
$695B
$6.88M 0.02%
11,139
-944
-8% -$524K
BDC icon
330
Belden
BDC
$5.39B
$6.8M 0.02%
+153,240
New +$6.97M
FAF icon
331
First American
FAF
$7.38B
$6.51M 0.02%
114,966
-67,050
-37% -$3.66M
AROC icon
332
Archrock
AROC
$5.84B
$6.5M 0.02%
684,996
-234,778
-26% -$2.3M
MNRL
333
DELISTED
Brigham Minerals, Inc. Class A Common Stock
MNRL
$5.62M 0.02%
383,809
-224,725
-37% -$3.26M
WLY icon
334
John Wiley & Sons Class A
WLY
$2.53B
$5.39M 0.02%
99,416
-12,237
-11% -$622K
BPFH
335
DELISTED
Boston Private Financial Holdings, Inc.
BPFH
$5.32M 0.02%
399,525
-943,187
-70% -$12.6M
CVCO icon
336
Cavco Industries
CVCO
$4.6B
$5.29M 0.02%
23,440
-13,675
-37% -$2.85M
BANC icon
337
Banc of California
BANC
$3.1B
$5.27M 0.02%
291,401
-170,153
-37% -$3.16M
NXST icon
338
Nexstar Media Group
NXST
$5.7B
$5.25M 0.02%
37,349
-21,843
-37% -$2.86M
PDD icon
339
Pinduoduo
PDD
$127B
$5.21M 0.02%
38,954
-1,085
-3% -$183K
FSS icon
340
Federal Signal
FSS
$7.71B
$5.19M 0.02%
135,577
-79,156
-37% -$2.86M
DEI icon
341
Douglas Emmett
DEI
$1.95B
$5.07M 0.02%
161,546
-168,485
-51% -$5.13M
AVNS
342
DELISTED
Avanos Medical
AVNS
$4.65M 0.02%
+106,367
New +$4.99M
AZUL
343
DELISTED
Azul
AZUL
$4.52M 0.01%
+223,870
New +$4.88M
DINO icon
344
HF Sinclair
DINO
$15.6B
$4.49M 0.01%
125,452
-73,513
-37% -$2.46M
ECH icon
345
iShares MSCI Chile ETF
ECH
$1.03B
$4.34M 0.01%
126,600
-177,460
-58% -$5.76M
NVO
346
Novo Nordisk
NVO
$203B
$3.74M 0.01%
111,038
-3,276
-3% -$117K
NGMS
347
DELISTED
NeoGames S.A. Ordinary Shares
NGMS
$3.59M 0.01%
+100,269
New +$3.2M
VTWO icon
348
Vanguard Russell 2000 ETF
VTWO
$17.4B
$3.58M 0.01%
40,208
– –
WHD icon
349
Cactus
WHD
$5.8B
$3.48M 0.01%
113,797
-66,626
-37% -$2.02M
ALG icon
350
Alamo Group
ALG
$2.01B
$3.41M 0.01%
21,861
-12,747
-37% -$1.94M
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.