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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
LQD icon
176
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$32.7B
$31.5M 0.1%
242,350
-20,110
-8% -$2.68M
DLB icon
177
Dolby
DLB
$5.75B
$30.7M 0.1%
311,270
+12,299
+4% +$1.18M
CYBR
178
DELISTED
CyberArk
CYBR
$30.7M 0.1%
237,109
-278,015
-54% -$42.1M
ACH
179
Accendra Health
ACH
$93.1M
$30.7M 0.1%
815,823
+398,051
+95% +$12.4M
BALL icon
180
Ball Corp
BALL
$16.4B
$30.6M 0.1%
360,876
+46,874
+15% +$4.1M
PLD icon
181
Prologis
PLD
$134B
$30.5M 0.1%
288,097
+4,776
+2% +$487K
TTWO icon
182
Take-Two Interactive
TTWO
$45.4B
$30.3M 0.1%
171,550
-5,412
-3% -$1.03M
KN icon
183
Knowles
KN
$3.33B
$30.3M 0.1%
1,447,622
+122,290
+9% +$2.49M
AIN icon
184
Albany International
AIN
$1.81B
$30M 0.1%
359,841
+27,472
+8% +$2.18M
AXGN icon
185
Axogen
AXGN
$2.67B
$29.7M 0.1%
1,465,047
+113,276
+8% +$2.24M
PRCH icon
186
Porch Group
PRCH
$1.83B
$29.4M 0.1%
1,662,946
+249,070
+18% +$4.43M
AERI
187
DELISTED
Aerie Pharmaceuticals
AERI
$29.3M 0.09%
1,637,872
+125,831
+8% +$2.17M
ALGN icon
188
Align Technology
ALGN
$12.4B
$28.9M 0.09%
53,375
-1,623
-3% -$897K
UPLD icon
189
Upland Software
UPLD
$14.9M
$28.9M 0.09%
61,172
+4,741
+8% +$2.29M
IAA
190
DELISTED
IAA, Inc. Common Stock
IAA
$28.6M 0.09%
518,561
+40,671
+9% +$2.41M
VMC icon
191
Vulcan Materials
VMC
$36.3B
$28.3M 0.09%
167,960
-5,089
-3% -$825K
ESE icon
192
ESCO Technologies
ESE
$7.78B
$27.3M 0.09%
251,113
-22,519
-8% -$2.38M
IDA icon
193
Idacorp
IDA
$8.21B
$26.4M 0.09%
264,070
-23,831
-8% -$2.18M
ALLE icon
194
Allegion
ALLE
$14.1B
$26.2M 0.09%
208,906
+2,238
+1% +$258K
LFUS icon
195
Littelfuse
LFUS
$11.7B
$26.1M 0.08%
98,701
+7,258
+8% +$1.93M
WNS
196
DELISTED
WNS Holdings
WNS
$25.4M 0.08%
350,905
+24,449
+7% +$1.78M
DIN icon
197
Dine Brands
DIN
$462M
$24.3M 0.08%
+269,361
New +$20.9M
MCHP icon
198
Microchip Technology
MCHP
$43.1B
$24.2M 0.08%
311,276
-8,552
-3% -$638K
AJG icon
199
Arthur J. Gallagher & Co
AJG
$65.5B
$23.6M 0.08%
189,172
-5,751
-3% -$694K
CDNA icon
200
CareDx
CDNA
$2.45B
$23.6M 0.08%
346,366
-69,055
-17% -$5.36M
6 7
8
9 10

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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.