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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
LSCC icon
101
Lattice Semiconductor
LSCC
$18.5B
$102M 0.26%
+1,393,692
New +$84.8M
EHC icon
102
Encompass Health
EHC
$12.3B
$102M 0.26%
803,283
-580,485
-42% -$69.1M
CHDN icon
103
Churchill Downs
CHDN
$6.16B
$98.7M 0.26%
1,017,726
+85,925
+9% +$8.84M
INSP icon
104
Inspire Medical Systems
INSP
$1.68B
$96.3M 0.25%
1,297,573
+528,404
+69% +$53.5M
NOVT icon
105
Novanta
NOVT
$6.39B
$96.2M 0.25%
960,573
-19,320
-2% -$2.3M
CADE
106
DELISTED
Cadence Bank
CADE
$95.5M 0.25%
2,544,499
+1,687,329
+197% +$60.8M
TECH icon
107
Bio-Techne
TECH
$11.3B
$95.1M 0.25%
1,709,662
+737,577
+76% +$39.5M
FSV icon
108
FirstService
FSV
$6.21B
$94.8M 0.25%
497,441
-14,046
-3% -$2.72M
TPG icon
109
TPG
TPG
$8.23B
$93.4M 0.24%
1,626,321
-116,635
-7% -$6.89M
GWRE icon
110
Guidewire Software
GWRE
$14.4B
$93.3M 0.24%
405,950
-72,498
-15% -$16.5M
BRBR icon
111
BellRing Brands
BRBR
$1.27B
$91.6M 0.24%
2,520,053
+366,121
+17% +$16.5M
PODD icon
112
Insulet
PODD
$10B
$90.6M 0.23%
293,503
-289,636
-50% -$90.7M
CLH icon
113
Clean Harbors
CLH
$16.8B
$89.3M 0.23%
384,358
-27,074
-7% -$6.41M
GKOS icon
114
Glaukos
GKOS
$10.9B
$89.2M 0.23%
1,093,744
-42,351
-4% -$3.89M
TME icon
115
Tencent Music
TME
$13.7B
$88.2M 0.23%
+3,777,985
New +$87.6M
VRRM icon
116
Verra Mobility
VRRM
$711M
$85.9M 0.22%
3,479,448
+896,564
+35% +$22.2M
FN icon
117
Fabrinet
FN
$20.8B
$82.7M 0.21%
226,677
+137,622
+155% +$45.3M
IDA icon
118
Idacorp
IDA
$8.21B
$82.3M 0.21%
623,057
-14,053
-2% -$1.74M
LPX icon
119
Louisiana-Pacific
LPX
$5.17B
$82.3M 0.21%
926,427
-49,921
-5% -$4.61M
FRPT icon
120
Freshpet
FRPT
$3.5B
$82.2M 0.21%
1,491,323
-35,745
-2% -$2.21M
IWF icon
121
iShares Russell 1000 Growth ETF
IWF
$128B
$79.2M 0.2%
+676,488
New +$75.3M
FLUT icon
122
Flutter Entertainment
FLUT
$16.9B
$78.1M 0.2%
307,612
-362,786
-54% -$106M
SKY icon
123
Champion Homes
SKY
$5.06B
$76.8M 0.2%
1,005,203
+237,037
+31% +$16.7M
PWP icon
124
Perella Weinberg Partners
PWP
$1.31B
$76M 0.2%
3,566,511
+1,298,246
+57% +$27.7M
MMYT icon
125
MakeMyTrip
MMYT
$5.65B
$72.9M 0.19%
778,584
-277,774
-26% -$27M
3 4
5
6 7

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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.