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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
RAMP icon
76
LiveRamp
RAMP
$2.3B
$162M 0.53%
3,125,769
-30,111
-1% -$2.05M
NFE icon
77
New Fortress Energy
NFE
$93.9M
$159M 0.51%
3,455,302
+871,216
+34% +$42.7M
TME icon
78
Tencent Music
TME
$14.1B
$159M 0.51%
7,737,783
-414,045
-5% -$10.5M
WOLF icon
79
Wolfspeed
WOLF
$1.64B
$156M 0.51%
1,444,501
-202,606
-12% -$22.8M
LECO icon
80
Lincoln Electric
LECO
$15.4B
$153M 0.49%
1,241,804
+24,965
+2% +$2.98M
FCFS icon
81
FirstCash
FCFS
$9.26B
$152M 0.49%
2,319,721
-23,394
-1% -$1.48M
ADBE icon
82
Adobe
ADBE
$107B
$144M 0.47%
303,582
+3,591
+1% +$1.68M
NKE icon
83
Nike
NKE
$61.4B
$142M 0.46%
1,070,258
+22,994
+2% +$3.2M
LESL icon
84
Leslie's
LESL
$7.34M
$142M 0.46%
+289,136
New +$148M
STEM icon
85
Stem
STEM
$56M
$141M 0.46%
265,815
-8,877
-3% -$5.7M
EL icon
86
Estee Lauder
EL
$31.8B
$138M 0.45%
473,782
+37,536
+9% +$10.3M
CRM icon
87
Salesforce
CRM
$164B
$135M 0.44%
638,855
+3,103
+0.5% +$691K
NOVT icon
88
Novanta
NOVT
$6.35B
$135M 0.44%
1,023,579
+8,373
+0.8% +$1.1M
INSP icon
89
Inspire Medical Systems
INSP
$1.68B
$133M 0.43%
643,181
+115,100
+22% +$24.5M
CERT icon
90
Certara
CERT
$1.25B
$132M 0.43%
4,839,715
+4,657,379
+2,554% +$155M
GWRE icon
91
Guidewire Software
GWRE
$15.1B
$130M 0.42%
1,279,393
+72,754
+6% +$8.46M
INSM icon
92
Insmed
INSM
$27.9B
$128M 0.42%
3,764,236
+60,610
+2% +$2.32M
PFPT
93
DELISTED
Proofpoint, Inc.
PFPT
$118M 0.38%
934,928
-2,379
-0.3% -$310K
PEGA icon
94
Pegasystems
PEGA
$5.47B
$112M 0.36%
+1,962,766
New +$128M
ZTS icon
95
Zoetis
ZTS
$31B
$112M 0.36%
712,090
+74,793
+12% +$11.9M
FIS icon
96
Fidelity National Information Services
FIS
$22.6B
$111M 0.36%
791,518
+49,625
+7% +$6.78M
TXN icon
97
Texas Instruments
TXN
$250B
$108M 0.35%
574,023
+11,549
+2% +$2.01M
HEI.A icon
98
HEICO Corp Class A
HEI.A
$38.2B
$107M 0.35%
943,681
-2,384
-0.3% -$277K
WK icon
99
Workiva
WK
$3.92B
$104M 0.34%
+1,173,654
New +$116M
CPRT icon
100
Copart
CPRT
$27.3B
$103M 0.33%
3,804,208
+9,568
+0.3% +$270K
2 3
4
5 6

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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.