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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
LOPE icon
251
Grand Canyon Education
LOPE
$3.77B
$26M 0.07%
118,654
+14,291
+14% +$2.75M
SIG icon
252
Signet Jewelers
SIG
$3.61B
$26M 0.07%
271,136
-33,748
-11% -$2.89M
COLB icon
253
Columbia Banking Systems
COLB
$9.18B
$25.8M 0.07%
1,003,636
-115,288
-10% -$2.93M
SLGN icon
254
Silgan Holdings
SLGN
$4.44B
$25.7M 0.07%
597,804
+61,572
+11% +$2.98M
ADTN icon
255
Adtran
ADTN
$669M
$25.7M 0.07%
2,736,430
-166,096
-6% -$1.55M
GVA icon
256
Granite Construction
GVA
$5.51B
$25.6M 0.07%
233,822
-66,208
-22% -$6.8M
BV icon
257
BrightView Holdings
BV
$1.1B
$25.6M 0.07%
+1,907,869
New +$28.3M
THG icon
258
Hanover Insurance
THG
$7.73B
$25.4M 0.07%
+139,892
New +$24M
OC icon
259
Owens Corning
OC
$12.3B
$25.4M 0.07%
179,288
+245
+0.1% +$35.9K
SITM icon
260
SiTime
SITM
$21.2B
$25.1M 0.06%
83,323
-29,466
-26% -$6.83M
CSGS
261
DELISTED
CSG Systems International
CSGS
$25.1M 0.06%
389,415
-97,248
-20% -$6.2M
DY icon
262
Dycom Industries
DY
$12.5B
$24.6M 0.06%
+84,431
New +$22.2M
UMH
263
UMH Properties
UMH
$1.41B
$24.6M 0.06%
1,656,802
-100,346
-6% -$1.61M
DFIN icon
264
Donnelley Financial Solutions
DFIN
$1.18B
$24.6M 0.06%
477,865
+67,092
+16% +$3.83M
TMCI icon
265
Treace Medical Concepts
TMCI
$311M
$24.4M 0.06%
3,634,381
+534,486
+17% +$3.49M
SHOO icon
266
Steven Madden
SHOO
$3.47B
$24.3M 0.06%
725,449
+48,234
+7% +$1.35M
JCAP
267
Jefferson Capital
JCAP
$1.33B
$24.1M 0.06%
1,394,142
+489,142
+54% +$8.69M
HUBG icon
268
HUB Group
HUBG
$2.57B
$23.8M 0.06%
690,978
-41,800
-6% -$1.49M
ESRT icon
269
Empire State Realty Trust
ESRT
$836M
$23.7M 0.06%
3,095,750
-187,682
-6% -$1.43M
BKV
270
BKV Corp
BKV
$2.84B
$23.7M 0.06%
1,025,090
+141,360
+16% +$3.08M
EMBC icon
271
Embecta
EMBC
$288M
$23.7M 0.06%
1,679,747
-312,857
-16% -$3.96M
TBBB icon
272
BBB Foods
TBBB
$5.96B
$23.5M 0.06%
871,752
-1,767,489
-67% -$45.9M
VCYT icon
273
Veracyte
VCYT
$3.45B
$23.3M 0.06%
+677,909
New +$19.4M
HAE icon
274
Haemonetics
HAE
$4.12B
$23.2M 0.06%
476,710
+57,332
+14% +$3.55M
FLS icon
275
Flowserve
FLS
$10.2B
$23M 0.06%
432,368
+3,112
+0.7% +$169K
9 10
11
12 13

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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.