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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
MMSI icon
51
Merit Medical Systems
MMSI
$5.4B
$208M 0.67%
3,476,929
+89,564
+3% +$5.13M
TXG icon
52
10x Genomics
TXG
$7.71B
$208M 0.67%
1,149,746
-132,515
-10% -$22.9M
ARES icon
53
Ares Management
ARES
$31.7B
$208M 0.67%
3,707,398
+22,020
+0.6% +$1.11M
PODD icon
54
Insulet
PODD
$9.73B
$207M 0.67%
795,244
-109,991
-12% -$29.5M
HDB icon
55
HDFC Bank
HDB
$119B
$206M 0.67%
5,310,702
+393,922
+8% +$15.4M
AAP icon
56
Advance Auto Parts
AAP
$3.15B
$204M 0.66%
1,114,333
-186,768
-14% -$31.3M
UNH icon
57
UnitedHealth
UNH
$362B
$202M 0.65%
542,881
+47,770
+10% +$16.6M
ZNGA
58
DELISTED
ZYNGA INC. CL A COMMON
ZNGA
$201M 0.65%
19,665,341
+75,279
+0.4% +$787K
CABO icon
59
Cable One
CABO
$191M
$200M 0.65%
109,342
+209
+0.2% +$408K
DT icon
60
Dynatrace
DT
$14.3B
$200M 0.65%
+4,138,525
New +$201M
AMED
61
DELISTED
Amedisys
AMED
$198M 0.64%
748,648
-1,865
-0.2% -$526K
GDDY icon
62
GoDaddy
GDDY
$11.3B
$197M 0.64%
2,541,831
+545
+0% +$43.9K
LGND icon
63
Ligand Pharmaceuticals
LGND
$5.81B
$197M 0.64%
2,069,880
-1,201,915
-37% -$114M
VRNS icon
64
Varonis Systems
VRNS
$4.85B
$192M 0.62%
3,740,158
+25,159
+0.7% +$1.49M
FSV icon
65
FirstService
FSV
$6.22B
$191M 0.62%
1,288,068
+10,035
+0.8% +$1.46M
HELE icon
66
Helen of Troy
HELE
$664M
$189M 0.61%
896,526
-86,506
-9% -$19.5M
NATI
67
DELISTED
National Instruments Corp
NATI
$184M 0.6%
4,270,308
+661,246
+18% +$29.1M
ZEN
68
DELISTED
ZENDESK INC
ZEN
$184M 0.6%
1,390,166
+284,513
+26% +$40.8M
TEAM icon
69
Atlassian
TEAM
$38.9B
$182M 0.59%
864,019
-31,456
-4% -$7.32M
GLOB icon
70
Globant
GLOB
$1.61B
$182M 0.59%
874,812
-36,821
-4% -$7.82M
TMX
71
DELISTED
Terminix Global Holdings, Inc.
TMX
$174M 0.56%
3,657,470
+833,557
+30% +$41.1M
ENTG icon
72
Entegris
ENTG
$24.1B
$172M 0.56%
1,541,011
+7,000
+0.5% +$721K
EYE icon
73
National Vision
EYE
$1.61B
$172M 0.56%
3,926,809
+36,212
+0.9% +$1.73M
AVLR
74
DELISTED
Avalara, Inc.
AVLR
$171M 0.56%
1,284,782
-3,195
-0.2% -$493K
TFX icon
75
Teleflex
TFX
$5.86B
$168M 0.54%
404,439
-89,194
-18% -$35.7M
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.