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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
+9.84%
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
$31.2B
AUM Growth
+$2.49B
Cap. Flow
+$357M
Cap. Flow %
1.14%
Top 10 Hldgs %
20.4%
Holding
426
New
33
Increased
232
Reduced
127
Closed
31

Top Buys

Rank Stock Value
1
TECH icon
Bio-Techne
TECH
+$186M
2
TYL icon
Tyler Technologies
TYL
+$171M
3
NVDA icon
NVIDIA
NVDA
+$167M
4
NOW icon
ServiceNow
NOW
+$128M
5
BFAM icon
Bright Horizons
BFAM
+$109M

Top Sells

Rank Stock Value
1
PD icon
PagerDuty
PD
+$171M
2
BLDR icon
Builders FirstSource
BLDR
+$157M
3
PYPL icon
PayPal
PYPL
+$135M
4
NATI
National Instruments Corp
NATI
+$122M
5
LECO icon
Lincoln Electric
LECO
+$116M

Sector Composition

Rank Sector Weight
1 Technology 25.63%
2 Industrials 16.13%
3 Healthcare 15.71%
4 Consumer Discretionary 14.7%
5 Financials 8.24%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
AMBA icon
76
Ambarella
AMBA
$3.64B
$140M 0.45%
1,678,140
+264,377
+19% +$19.3M
FOXF icon
77
Fox Factory Holding Corp
FOXF
$905M
$138M 0.44%
1,270,019
-104,998
-8% -$10.7M
ORLY icon
78
O'Reilly Automotive
ORLY
$74.9B
$136M 0.44%
2,143,065
+77,370
+4% +$4.72M
GMED icon
79
Globus Medical
GMED
$11.4B
$135M 0.43%
2,273,185
+409,873
+22% +$23.4M
RGEN icon
80
Repligen
RGEN
$9.3B
$134M 0.43%
945,869
+34,501
+4% +$5.53M
VIRT icon
81
Virtu Financial
VIRT
$4.86B
$133M 0.43%
7,758,562
+1,605,132
+26% +$29.4M
APO icon
82
Apollo Global Management
APO
$82.8B
$131M 0.42%
1,711,091
-336,405
-16% -$22.5M
ALRM icon
83
Alarm.com
ALRM
$2.77B
$131M 0.42%
2,527,718
-4,538
-0.2% -$223K
CERT icon
84
Certara
CERT
$1.24B
$129M 0.41%
7,073,109
+46,323
+0.7% +$978K
WOLF icon
85
Wolfspeed
WOLF
$1.57B
$128M 0.41%
2,303,525
+670,154
+41% +$34.1M
WSC icon
86
WillScot Mobile Mini Holdings
WSC
$4.15B
$123M 0.4%
2,580,274
+183,081
+8% +$8.19M
MNST icon
87
Monster Beverage
MNST
$89.2B
$122M 0.39%
4,248,606
+975,562
+30% +$27.7M
TW icon
88
Tradeweb Markets
TW
$22B
$121M 0.39%
1,773,761
+968,685
+120% +$68.6M
SHLS icon
89
Shoals Technologies Group
SHLS
$1.47B
$121M 0.39%
4,744,370
+1,254,232
+36% +$29M
WAL icon
90
Western Alliance Bancorporation
WAL
$8.89B
$121M 0.39%
3,318,007
+1,476,194
+80% +$51.2M
CNI icon
91
Canadian National Railway
CNI
$76.4B
$120M 0.39%
994,301
-7,360
-0.7% -$873K
BAP icon
92
Credicorp
BAP
$30B
$119M 0.38%
805,299
+9,868
+1% +$1.35M
MKSI icon
93
MKS Inc
MKSI
$19.9B
$111M 0.36%
1,028,945
+131,898
+15% +$12.1M
FIVE icon
94
Five Below
FIVE
$13B
$108M 0.35%
547,644
-15,863
-3% -$3.1M
SBUX icon
95
Starbucks
SBUX
$122B
$108M 0.34%
1,085,258
-260,182
-19% -$27M
ELF icon
96
e.l.f. Beauty
ELF
$5.61B
$103M 0.33%
+900,365
New +$86.7M
NATI
97
DELISTED
National Instruments Corp
NATI
$101M 0.32%
1,763,212
-2,137,396
-55% -$122M
NEOG icon
98
Neogen
NEOG
$2.51B
$97.6M 0.31%
+4,489,415
New +$81.2M
TENB icon
99
Tenable Holdings
TENB
$4.17B
$96.6M 0.31%
2,217,479
+394,264
+22% +$16.1M
BPMC
100
DELISTED
Blueprint Medicines
BPMC
$93.2M 0.3%
1,474,490
+392,041
+36% +$21.3M
2 3
4
5 6

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William Blair Investment Management's Q2 2023 Portfolio in Review

As of Q2 2023, William Blair Investment Management held 426 positions worth $31.2B, up 8.7% from $28.7B the previous quarter. Its ten largest holdings account for 20% of the portfolio.

William Blair Investment Management's Q2 2023 filing shows 33 new, 232 increased, 127 reduced and 31 closed positions. Its largest new stake was Bio-Techne: 2,314,458 shares worth $189M. The largest sale was PagerDuty, an estimated $171M.

By sector, the portfolio is most concentrated in Technology at 26% of assets, up from 25% a quarter earlier, followed by Industrials and Healthcare.

  • William Blair Investment Management's largest Q2 2023 buy was Bio-Techne: 2,314,458 shares worth $189M.
  • William Blair Investment Management added most to NVIDIA in Q2 2023, an estimated $167M increase.
  • William Blair Investment Management's biggest Q2 2023 reduction was Builders FirstSource, cutting an estimated $157M.
  • William Blair Investment Management fully exited PagerDuty in Q2 2023, selling an estimated $171M.
  • William Blair Investment Management's ten largest holdings make up 20% of its $31.2B portfolio in Q2 2023.
  • William Blair Investment Management opened 33 new positions and closed 31 in Q2 2023.
  • William Blair Investment Management's portfolio value rose 8.7% quarter-over-quarter to $31.2B.

Based on William Blair Investment Management's 13F filing for Q2 2023, filed 11 Aug 2023.