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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
+5.82%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+788.31%
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 24.56%
2 Healthcare 21.08%
3 Industrials 14.45%
4 Consumer Discretionary 12.96%
5 Financials 7.45%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TSM icon
1
TSMC
TSM
$2.17T
$1.22B 3.96%
10,338,901
-1,893,220
-15% -$235M
SPY icon
2
State Street SPDR S&P 500 ETF Trust
SPY
$818B
$565M 1.83%
1,426,450
-280,540
-16% -$108M
BWXT icon
3
BWX Technologies
BWXT
$15.3B
$492M 1.59%
7,461,456
+74,584
+1% +$4.47M
MSFT icon
4
Microsoft
MSFT
$3.71T
$454M 1.47%
1,926,538
+244,392
+15% +$56.7M
CNI icon
5
Canadian National Railway
CNI
$76.5B
$443M 1.43%
3,816,219
+616,751
+19% +$68.5M
LOPE icon
6
Grand Canyon Education
LOPE
$3.88B
$439M 1.42%
4,101,633
+20,347
+0.5% +$2.02M
BCO icon
7
Brink's
BCO
$4.65B
$422M 1.37%
5,332,539
+83,819
+2% +$6.33M
MELI icon
8
Mercado Libre
MELI
$92.8B
$405M 1.31%
275,029
-69,862
-20% -$119M
AMZN icon
9
Amazon
AMZN
$2.94T
$389M 1.26%
2,516,640
+105,880
+4% +$16.8M
HZNP
10
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
$382M 1.24%
4,149,195
-1,104,803
-21% -$93.2M
EHC icon
11
Encompass Health
EHC
$12.4B
$377M 1.22%
5,782,073
-83,718
-1% -$5.46M
GOOGL icon
12
Alphabet (Google) Class A
GOOGL
$4.38T
$336M 1.09%
3,259,140
+5,680
+0.2% +$561K
CCK icon
13
Crown Holdings
CCK
$13.2B
$334M 1.08%
3,443,410
+351,373
+11% +$33.9M
P
14
Everpure Inc
P
$29B
$333M 1.08%
15,461,407
-247,708
-2% -$5.89M
MLM icon
15
Martin Marietta Materials
MLM
$32.3B
$330M 1.07%
982,332
-178,828
-15% -$57.1M
SE icon
16
Sea Limited
SE
$68B
$323M 1.05%
1,446,908
-636,886
-31% -$148M
AZTA icon
17
Azenta
AZTA
$1.42B
$318M 1.03%
3,888,759
+49,238
+1% +$3.97M
TECH icon
18
Bio-Techne
TECH
$11.2B
$316M 1.02%
3,305,748
+382,580
+13% +$34.9M
BJ icon
19
BJs Wholesale Club
BJ
$12.4B
$305M 0.99%
6,797,514
-298,943
-4% -$12.5M
ABMD
20
DELISTED
Abiomed Inc
ABMD
$299M 0.97%
937,156
+370,442
+65% +$119M
TREX icon
21
Trex
TREX
$4.93B
$291M 0.94%
3,177,744
+8,315
+0.3% +$782K
EEFT icon
22
Euronet Worldwide
EEFT
$2.73B
$290M 0.94%
2,099,206
+94,316
+5% +$13.6M
CRL icon
23
Charles River Laboratories
CRL
$12.7B
$288M 0.93%
992,180
+861,234
+658% +$239M
ACHC icon
24
Acadia Healthcare
ACHC
$2.86B
$274M 0.89%
4,803,762
+2,097,022
+77% +$113M
GNRC icon
25
Generac Holdings
GNRC
$12.5B
$270M 0.87%
825,071
-13,529
-2% -$3.99M
1
2 3 4 5

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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.