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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
FCPT icon
226
Four Corners Property Trust
FCPT
$2.76B
$28.4M 0.07%
1,165,167
-70,457
-6% -$1.82M
KLIC icon
227
Kulicke & Soffa
KLIC
$5.05B
$28.4M 0.07%
698,158
-42,563
-6% -$1.58M
PBF icon
228
PBF Energy
PBF
$8.57B
$28.1M 0.07%
932,795
-56,322
-6% -$1.47M
KEX icon
229
Kirby Corp
KEX
$7.18B
$28M 0.07%
335,657
+46,287
+16% +$4.65M
XPRO icon
230
Expro Ltd
XPRO
$2.06B
$28M 0.07%
2,355,092
-142,149
-6% -$1.54M
NBIS
231
Nebius Group N.V.
NBIS
$69.7B
$28M 0.07%
+249,125
New +$17.3M
OMF icon
232
OneMain Financial
OMF
$7.39B
$27.9M 0.07%
494,816
-4,773
-1% -$282K
ICUI icon
233
ICU Medical
ICUI
$4.54B
$27.9M 0.07%
232,168
+20,829
+10% +$2.64M
KFY icon
234
Korn Ferry
KFY
$4.27B
$27.8M 0.07%
397,644
-24,116
-6% -$1.76M
EXTR icon
235
Extreme Networks
EXTR
$3.29B
$27.8M 0.07%
1,346,908
-551,699
-29% -$11M
DIOD icon
236
Diodes
DIOD
$4.59B
$27.8M 0.07%
521,825
-31,662
-6% -$1.7M
ZETA icon
237
Zeta Global
ZETA
$7.1B
$27.8M 0.07%
1,396,797
+148,927
+12% +$2.67M
JBI icon
238
Janus International
JBI
$675M
$27.4M 0.07%
2,777,240
-860,019
-24% -$8.29M
ELME
239
Elme Communities
ELME
$145M
$27.2M 0.07%
1,614,106
-97,722
-6% -$1.62M
SILA
240
DELISTED
Sila Realty Trust
SILA
$27.2M 0.07%
1,082,122
-65,651
-6% -$1.63M
VSH icon
241
Vishay Intertechnology
VSH
$5.28B
$27M 0.07%
1,761,526
-106,482
-6% -$1.69M
AEHR icon
242
Aehr Test Systems
AEHR
$4.17B
$26.9M 0.07%
+894,061
New +$19.4M
ADC icon
243
Agree Realty
ADC
$9.31B
$26.9M 0.07%
377,981
+1,482
+0.4% +$107K
NWE icon
244
NorthWestern Energy
NWE
$4.4B
$26.7M 0.07%
456,220
-27,654
-6% -$1.53M
STRL icon
245
Sterling Infrastructure
STRL
$16.8B
$26.5M 0.07%
+78,090
New +$22.2M
ECVT icon
246
Ecovyst
ECVT
$1.11B
$26.4M 0.07%
3,014,160
-182,742
-6% -$1.61M
KRYS icon
247
Krystal Biotech
KRYS
$9.86B
$26.4M 0.07%
149,302
+58,203
+64% +$8.71M
AWI icon
248
Armstrong World Industries
AWI
$7.74B
$26.3M 0.07%
134,053
-8,086
-6% -$1.5M
THR
249
DELISTED
Thermon Group Holdings
THR
$26.2M 0.07%
980,348
-59,447
-6% -$1.6M
CENTA icon
250
Central Garden & Pet Co Class A
CENTA
$2.44B
$26.1M 0.07%
884,784
+53,351
+6% +$1.78M
8 9
10
11 12

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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.