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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
+10.81%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+788.31%
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
NVDA icon
1
NVIDIA
NVDA
$5.42T
$2.16B 5.58%
11,569,001
-703,392
-6% -$123M
MSFT icon
2
Microsoft
MSFT
$3.71T
$1.99B 5.14%
3,836,826
-144,895
-4% -$73.9M
TSM icon
3
TSMC
TSM
$2.18T
$1.79B 4.64%
6,422,158
-200,097
-3% -$48.9M
AAPL icon
4
Apple
AAPL
$4.57T
$1.43B 3.7%
5,620,453
+366,612
+7% +$82.8M
AMZN icon
5
Amazon
AMZN
$2.96T
$971M 2.51%
4,421,161
-979,192
-18% -$222M
AVGO icon
6
Broadcom
AVGO
$2.04T
$927M 2.4%
2,811,124
-148,048
-5% -$45.4M
META icon
7
Meta Platforms (Facebook)
META
$1.51T
$871M 2.25%
1,186,127
-242,994
-17% -$181M
MA icon
8
Mastercard
MA
$493B
$629M 1.63%
1,105,345
-114,920
-9% -$66M
SE icon
9
Sea Limited
SE
$69.5B
$619M 1.6%
3,463,532
-124,615
-3% -$21.4M
GOOGL icon
10
Alphabet (Google) Class A
GOOGL
$4.33T
$604M 1.56%
2,486,002
+2,126,770
+592% +$445M
CG icon
11
Carlyle Group
CG
$17.2B
$549M 1.42%
8,748,975
-1,200,480
-12% -$75M
MELI icon
12
Mercado Libre
MELI
$92.3B
$537M 1.39%
229,804
-8,795
-4% -$21.1M
DOCS icon
13
Doximity
DOCS
$5B
$426M 1.1%
5,829,169
+609,775
+12% +$39.8M
TRU icon
14
TransUnion
TRU
$15.3B
$392M 1.01%
4,678,809
-60,294
-1% -$5.47M
P
15
Everpure Inc
P
$29.9B
$391M 1.01%
4,666,892
-259,944
-5% -$17.3M
CIEN icon
16
Ciena
CIEN
$58.4B
$356M 0.92%
2,440,888
-267,652
-10% -$27.3M
NOW icon
17
ServiceNow
NOW
$129B
$344M 0.89%
1,870,050
+117,205
+7% +$21.9M
INTU icon
18
Intuit
INTU
$89B
$333M 0.86%
487,232
-29,899
-6% -$21.6M
ORLY icon
19
O'Reilly Automotive
ORLY
$76.3B
$314M 0.81%
2,915,674
-628,409
-18% -$63.2M
ORCL icon
20
Oracle
ORCL
$423B
$311M 0.81%
1,107,586
+246,243
+29% +$62.7M
NU icon
21
Nu Holdings
NU
$66.9B
$311M 0.81%
19,449,424
+12,574,893
+183% +$175M
COST icon
22
Costco
COST
$420B
$299M 0.77%
322,740
-53,745
-14% -$51.5M
IDXX icon
23
Idexx Laboratories
IDXX
$46.2B
$293M 0.76%
459,019
-226,069
-33% -$137M
TLN
24
Talen Energy Corp
TLN
$16.7B
$289M 0.75%
679,697
-422,085
-38% -$152M
A icon
25
Agilent Technologies
A
$41.2B
$275M 0.71%
2,144,086
-70,401
-3% -$8.5M
1
2 3 4 5

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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.