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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
TKR icon
376
Timken Company
TKR
$9.1B
$416K ﹤0.01%
5,531
-157
-3% -$12.1K
AXTA icon
377
Axalta
AXTA
$7.94B
$411K ﹤0.01%
14,363
-436
-3% -$13.1K
LH icon
378
Labcorp
LH
$26.1B
$397K ﹤0.01%
1,384
-48
-3% -$12.9K
NTES icon
379
NetEase
NTES
$78.3B
$397K ﹤0.01%
+2,611
New +$359K
CCK icon
380
Crown Holdings
CCK
$13B
$394K ﹤0.01%
4,081
-730
-15% -$73.2K
PCTY icon
381
Paylocity
PCTY
$7.7B
$394K ﹤0.01%
2,474
-475,421
-99% -$84.2M
ICLR icon
382
Icon
ICLR
$12.7B
$384K ﹤0.01%
2,193
-71
-3% -$11.9K
LKQ icon
383
LKQ Corp
LKQ
$6.22B
$378K ﹤0.01%
12,392
-388
-3% -$12.7K
HST icon
384
Host Hotels & Resorts
HST
$15.7B
$372K ﹤0.01%
21,830
-640
-3% -$10.6K
TAP icon
385
Molson Coors Class B
TAP
$7.8B
$365K ﹤0.01%
8,057
-255
-3% -$12.6K
EXE
386
Expand Energy Corp
EXE
$22B
$354K ﹤0.01%
3,330
-118
-3% -$11.8K
JBHT icon
387
JB Hunt Transport Services
JBHT
$26.4B
$350K ﹤0.01%
2,609
-82
-3% -$11.8K
FLR icon
388
Fluor
FLR
$6.93B
$348K ﹤0.01%
+8,268
New +$381K
ACN icon
389
Accenture
ACN
$109B
$343K ﹤0.01%
1,389
-126
-8% -$32.9K
BC icon
390
Brunswick
BC
$5.24B
$327K ﹤0.01%
5,177
-165
-3% -$10.2K
AFG icon
391
American Financial Group
AFG
$12B
$320K ﹤0.01%
2,195
-116
-5% -$15.4K
INGR icon
392
Ingredion
INGR
$6.62B
$318K ﹤0.01%
2,601
-83
-3% -$10.7K
JBL icon
393
Jabil
JBL
$39.3B
$312K ﹤0.01%
1,436
-45
-3% -$9.8K
CPT icon
394
Camden Property Trust
CPT
$11.1B
$301K ﹤0.01%
2,819
-80
-3% -$8.79K
TOL icon
395
Toll Brothers
TOL
$13.9B
$266K ﹤0.01%
1,926
-22
-1% -$2.87K
WTW icon
396
Willis Towers Watson
WTW
$31.2B
$261K ﹤0.01%
756
-9
-1% -$2.92K
ETR icon
397
Entergy
ETR
$50B
$257K ﹤0.01%
2,757
-32
-1% -$2.81K
SSB icon
398
SouthState Bank Corp
SSB
$10.8B
$256K ﹤0.01%
2,587
-136
-5% -$13.4K
WBS icon
399
Webster Financial
WBS
$12.8B
$255K ﹤0.01%
4,286
-214
-5% -$12.8K
STT icon
400
State Street
STT
$52.1B
$252K ﹤0.01%
2,174
-25
-1% -$2.79K
14 15
16
17 18

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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.