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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
+10.81%
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
$38.7B
AUM Growth
+$994M
Cap. Flow
-$1.59B
Cap. Flow %
-4.12%
Top 10 Hldgs %
31.01%
Holding
462
New
45
Increased
110
Reduced
257
Closed
48

Top Buys

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$445M
2
NU icon
Nu Holdings
NU
+$175M
3
BSY icon
Bentley Systems
BSY
+$161M
4
CAVA icon
CAVA Group
CAVA
+$143M
5
SNOW icon
Snowflake
SNOW
+$111M

Top Sells

Rank Stock Value
1
DDOG icon
Datadog
DDOG
+$298M
2
AMZN icon
Amazon
AMZN
+$222M
3
META icon
Meta Platforms (Facebook)
META
+$181M
4
TLN
Talen Energy Corp
TLN
+$152M
5
EPAM icon
EPAM Systems
EPAM
+$149M

Sector Composition

Rank Sector Weight
1 Technology 38.52%
2 Consumer Discretionary 12.99%
3 Financials 12.96%
4 Healthcare 10.56%
5 Industrials 9.02%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
EXP icon
76
Eagle Materials
EXP
$6.47B
$143M 0.37%
615,250
+3,505
+0.6% +$795K
SN icon
77
SharkNinja
SN
$26.2B
$142M 0.37%
1,381,451
-810,615
-37% -$92.6M
EYE icon
78
National Vision
EYE
$1.56B
$141M 0.37%
4,840,473
+1,280,783
+36% +$31.5M
EXAS
79
DELISTED
Exact Sciences
EXAS
$140M 0.36%
2,555,051
+534,881
+26% +$26.7M
BFAM icon
80
Bright Horizons
BFAM
$3.76B
$137M 0.36%
1,265,118
-181,003
-13% -$21M
CRM icon
81
Salesforce
CRM
$158B
$135M 0.35%
568,366
-190,400
-25% -$48M
WGS icon
82
GeneDx Holdings
WGS
$2.46B
$131M 0.34%
1,220,138
-411,264
-25% -$44.8M
ONB icon
83
Old National Bancorp
ONB
$10.4B
$129M 0.33%
5,869,840
+645,288
+12% +$14.3M
EXLS icon
84
EXL Service
EXLS
$5.2B
$128M 0.33%
2,897,088
-290,440
-9% -$12.6M
EVR icon
85
Evercore
EVR
$11.5B
$126M 0.33%
373,148
-21,940
-6% -$6.88M
FOLD
86
DELISTED
Amicus Therapeutics
FOLD
$124M 0.32%
15,749,240
+1,107,083
+8% +$7.88M
FHN icon
87
First Horizon
FHN
$12.3B
$118M 0.31%
5,219,830
+1,456,820
+39% +$32.4M
MZTI
88
The Marzetti Company
MZTI
$3.18B
$118M 0.3%
680,240
-193,117
-22% -$34.6M
SNOW icon
89
Snowflake
SNOW
$115B
$117M 0.3%
+518,209
New +$111M
CART icon
90
Maplebear
CART
$11.2B
$117M 0.3%
3,177,828
-167,964
-5% -$7.73M
TWST icon
91
Twist Bioscience
TWST
$7.85B
$117M 0.3%
4,142,283
+235,679
+6% +$7.14M
CRS icon
92
Carpenter Technology
CRS
$26.3B
$114M 0.3%
466,244
-21,453
-4% -$5.49M
CAVA icon
93
CAVA Group
CAVA
$8.09B
$114M 0.3%
+1,888,723
New +$143M
WMS icon
94
Advanced Drainage Systems
WMS
$10.6B
$114M 0.29%
820,203
-113,392
-12% -$14.9M
ACVA icon
95
ACV Auctions
ACVA
$1.35B
$114M 0.29%
11,471,709
+362,003
+3% +$4.64M
WSC icon
96
WillScot Mobile Mini Holdings
WSC
$4B
$112M 0.29%
5,317,291
-145,667
-3% -$3.75M
NXT icon
97
Nextpower Inc
NXT
$15.7B
$109M 0.28%
+1,469,638
New +$94.7M
TER icon
98
Teradyne
TER
$63B
$107M 0.28%
+775,463
New +$84.7M
GTX icon
99
Garrett Motion
GTX
$5.47B
$105M 0.27%
7,715,824
+2,605,296
+51% +$33M
DBD icon
100
Diebold Nixdorf
DBD
$2.44B
$104M 0.27%
1,819,728
+197,086
+12% +$11.7M
2 3
4
5 6

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William Blair Investment Management's Q3 2025 Portfolio in Review

As of Q3 2025, William Blair Investment Management held 462 positions worth $38.7B, up 2.6% from $37.7B the previous quarter. Its ten largest holdings account for 31% of the portfolio.

William Blair Investment Management withdrew a net $1.59B in Q3 2025, closing 48 positions and reducing 257 holdings. Its most notable exit was EPAM Systems, an estimated $149M position sold in full.

By sector, the portfolio is most concentrated in Technology at 39% of assets, up from 36% a quarter earlier, followed by Consumer Discretionary and Financials.

Against the trend, William Blair Investment Management opened a new position in Bentley Systems worth $151M.

  • William Blair Investment Management's largest Q3 2025 buy was Bentley Systems: 2,931,296 shares worth $151M.
  • William Blair Investment Management added most to Alphabet (Google) Class A in Q3 2025, an estimated $445M increase.
  • William Blair Investment Management's biggest Q3 2025 reduction was Datadog, cutting an estimated $298M.
  • William Blair Investment Management fully exited EPAM Systems in Q3 2025, selling an estimated $149M.
  • William Blair Investment Management's ten largest holdings make up 31% of its $38.7B portfolio in Q3 2025.
  • William Blair Investment Management opened 45 new positions and closed 48 in Q3 2025.
  • William Blair Investment Management's portfolio value rose 2.6% quarter-over-quarter to $38.7B.

Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.