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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
MA icon
26
Mastercard
MA
$492B
$269M 0.87%
755,068
+137,538
+22% +$48M
BFAM icon
27
Bright Horizons
BFAM
$3.76B
$266M 0.86%
1,550,964
+321,792
+26% +$53M
LYV icon
28
Live Nation Entertainment
LYV
$42.7B
$265M 0.86%
3,133,968
-48,282
-2% -$3.89M
NICE icon
29
Nice
NICE
$5.95B
$265M 0.86%
1,214,859
-61,301
-5% -$15.3M
CCJ icon
30
Cameco
CCJ
$43B
$260M 0.84%
15,628,923
+218,233
+1% +$3.35M
HQY icon
31
HealthEquity
HQY
$8.83B
$258M 0.84%
3,792,641
+138,278
+4% +$10.9M
BLDR icon
32
Builders FirstSource
BLDR
$8.08B
$257M 0.83%
5,544,194
+81,461
+1% +$3.47M
AXON
33
Axon Enterprise
AXON
$51.7B
$256M 0.83%
1,797,363
-11,140
-0.6% -$1.74M
NBIS
34
Nebius Group N.V.
NBIS
$49.1B
$251M 0.81%
3,920,651
-173,357
-4% -$11.6M
VCYT icon
35
Veracyte
VCYT
$3.73B
$247M 0.8%
4,595,602
-612,337
-12% -$35.3M
ZD icon
36
Ziff Davis
ZD
$1.83B
$242M 0.78%
2,319,982
-7,526
-0.3% -$709K
LULU icon
37
lululemon athletica
LULU
$14.3B
$239M 0.77%
778,093
-26,334
-3% -$8.64M
ETSY icon
38
Etsy
ETSY
$7.29B
$239M 0.77%
1,182,940
-809,861
-41% -$170M
PEN icon
39
Penumbra
PEN
$12.9B
$234M 0.76%
866,553
-469,710
-35% -$121M
RBA icon
40
RB Global
RBA
$16.6B
$234M 0.76%
4,004,208
+24,400
+0.6% +$1.43M
MRCY icon
41
Mercury Systems
MRCY
$6.55B
$231M 0.75%
3,268,644
+19,080
+0.6% +$1.38M
ALRM icon
42
Alarm.com
ALRM
$2.77B
$229M 0.74%
2,648,293
-220,337
-8% -$20.8M
RYAAY icon
43
Ryanair
RYAAY
$30.8B
$227M 0.73%
4,929,948
+4,876,653
+9,150% +$210M
AZPN
44
DELISTED
ASPEN TECHNOLOGY INC
AZPN
$223M 0.72%
1,546,971
+10,823
+0.7% +$1.56M
WAL icon
45
Western Alliance Bancorporation
WAL
$8.89B
$223M 0.72%
2,359,871
-152,978
-6% -$12.7M
HALO icon
46
Halozyme
HALO
$11.6B
$223M 0.72%
5,337,462
-1,024,882
-16% -$46.8M
VIRT icon
47
Virtu Financial
VIRT
$4.86B
$220M 0.71%
7,099,836
+962,145
+16% +$26.5M
BURL icon
48
Burlington
BURL
$22.6B
$220M 0.71%
736,035
+130,843
+22% +$35.6M
PYPL icon
49
PayPal
PYPL
$50.5B
$213M 0.69%
876,328
-32,369
-4% -$8.17M
TAL icon
50
TAL Education Group
TAL
$6.75B
$210M 0.68%
3,906,664
-688,693
-15% -$50.4M
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.