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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
REXR icon
176
Rexford Industrial Realty
REXR
$8.11B
$35.7M 0.09%
867,835
+5,522
+0.6% +$216K
WLY icon
177
John Wiley & Sons Class A
WLY
$2.53B
$35.6M 0.09%
878,593
-53,159
-6% -$2.15M
BANC icon
178
Banc of California
BANC
$3.1B
$35.2M 0.09%
2,129,364
-128,972
-6% -$2.02M
VRNS icon
179
Varonis Systems
VRNS
$4.82B
$35.2M 0.09%
612,673
-330,329
-35% -$18.3M
FBNC icon
180
First Bancorp
FBNC
$2.72B
$35.2M 0.09%
665,017
-40,326
-6% -$2.07M
WINA icon
181
Winmark
WINA
$1.24B
$35.2M 0.09%
70,635
+9,800
+16% +$4.21M
CECO icon
182
Ceco Environmental
CECO
$4.43B
$35.1M 0.09%
685,742
-260,155
-28% -$11M
STEL
183
DELISTED
Stellar Bancorp
STEL
$35M 0.09%
1,154,945
+86,363
+8% +$2.62M
COLD icon
184
Americold
COLD
$4.17B
$35M 0.09%
2,860,204
+195,606
+7% +$2.91M
GXO icon
185
GXO Logistics
GXO
$5.52B
$35M 0.09%
660,919
+129,920
+24% +$6.68M
PDFS icon
186
PDF Solutions
PDFS
$2.19B
$34.8M 0.09%
1,349,441
+162,358
+14% +$3.55M
XP icon
187
XP
XP
$7.98B
$34.8M 0.09%
+1,852,597
New +$33.2M
EVH icon
188
Evolent Health
EVH
$471M
$34.1M 0.09%
4,035,475
-289,408
-7% -$2.81M
ATMU icon
189
Atmus Filtration Technologies
ATMU
$4.06B
$33.9M 0.09%
751,757
-45,526
-6% -$1.91M
TCBI icon
190
Texas Capital Bancshares
TCBI
$4.38B
$33.8M 0.09%
399,461
-154,907
-28% -$13.2M
NEOG icon
191
Neogen
NEOG
$2.5B
$33.7M 0.09%
5,907,034
-3,495,986
-37% -$18.7M
EFSC icon
192
Enterprise Financial Services Corp
EFSC
$2.41B
$33.5M 0.09%
577,965
-35,054
-6% -$2.04M
WAFD icon
193
WaFd
WAFD
$2.79B
$33.3M 0.09%
1,100,312
+137,525
+14% +$4.21M
WMT icon
194
Walmart Inc
WMT
$923B
$32.9M 0.09%
318,930
-43,152
-12% -$4.3M
CMC icon
195
Commercial Metals
CMC
$8B
$32.7M 0.08%
570,831
-34,512
-6% -$1.91M
OPLN
196
Openlane
OPLN
$4.34B
$32.2M 0.08%
1,118,685
-202,954
-15% -$5.53M
TPH
197
DELISTED
Tri Pointe Homes
TPH
$32.2M 0.08%
947,416
-57,394
-6% -$1.95M
INTR icon
198
Inter&Co
INTR
$2.23B
$32.2M 0.08%
3,484,335
+1,816,322
+109% +$14.3M
SIGI icon
199
Selective Insurance
SIGI
$5.59B
$32M 0.08%
394,861
-23,812
-6% -$1.92M
CTRE icon
200
CareTrust REIT
CTRE
$9.25B
$32M 0.08%
921,332
-462,643
-33% -$15.2M
6 7
8
9 10

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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.