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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
-6.4%
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
$35.6B
AUM Growth
-$5.32B
Cap. Flow
-$1.91B
Cap. Flow %
-5.36%
Top 10 Hldgs %
26.78%
Holding
469
New
36
Increased
114
Reduced
269
Closed
46

Top Buys

Rank Stock Value
1
AVGO icon
Broadcom
AVGO
+$515M
2
SE icon
Sea Limited
SE
+$179M
3
TYL icon
Tyler Technologies
TYL
+$177M
4
WAY
Waystar Holding Corp
WAY
+$167M
5
CIEN icon
Ciena
CIEN
+$159M

Top Sells

Rank Stock Value
1
AMD icon
Advanced Micro Devices
AMD
+$229M
2
ACN icon
Accenture
ACN
+$222M
3
PEN icon
Penumbra
PEN
+$210M
4
CF icon
CF Industries
CF
+$201M
5
TXN icon
Texas Instruments
TXN
+$184M

Sector Composition

Rank Sector Weight
1 Technology 32.57%
2 Consumer Discretionary 15.58%
3 Financials 13.1%
4 Healthcare 12.15%
5 Industrials 9.67%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PGR icon
151
Progressive
PGR
$121B
$45.1M 0.13%
159,401
+25,059
+19% +$6.55M
OEC icon
152
Orion
OEC
$364M
$45.1M 0.13%
3,486,054
+24,104
+0.7% +$341K
GPOR icon
153
Gulfport Energy Corp
GPOR
$3B
$44.9M 0.13%
243,715
-11,302
-4% -$2.05M
WLY icon
154
John Wiley & Sons Class A
WLY
$2.53B
$44.9M 0.13%
1,006,818
-46,217
-4% -$1.95M
TCBI icon
155
Texas Capital Bancshares
TCBI
$4.38B
$44.8M 0.13%
600,172
-27,718
-4% -$2.15M
TMHC
156
DELISTED
Taylor Morrison
TMHC
$44.8M 0.13%
746,706
-34,299
-4% -$2.14M
ABCB icon
157
Ameris Bancorp
ABCB
$5.94B
$43.4M 0.12%
754,558
-34,713
-4% -$2.17M
CTRE icon
158
CareTrust REIT
CTRE
$9.25B
$42.8M 0.12%
1,497,757
-69,252
-4% -$1.86M
ISRG icon
159
Intuitive Surgical
ISRG
$142B
$42.8M 0.12%
86,395
+1,925
+2% +$1.06M
ELS icon
160
Equity Lifestyle Properties
ELS
$12.4B
$42.1M 0.12%
631,600
+59,319
+10% +$3.96M
EVH icon
161
Evolent Health
EVH
$471M
$41.7M 0.12%
4,403,937
-377,194
-8% -$3.81M
GTX icon
162
Garrett Motion
GTX
$5.47B
$41.7M 0.12%
4,982,049
-2,410,548
-33% -$22.4M
BANR icon
163
Banner Corp
BANR
$2.5B
$39.7M 0.11%
622,641
-11,938
-2% -$804K
EBC icon
164
Eastern Bankshares
EBC
$5.34B
$39.3M 0.11%
2,395,294
-110,245
-4% -$1.92M
KOS icon
165
Kosmos Energy
KOS
$1.49B
$39.1M 0.11%
17,169,011
-1,574,723
-8% -$4.65M
WFRD icon
166
Weatherford International
WFRD
$6.65B
$38.9M 0.11%
726,404
+226,399
+45% +$14.4M
AR icon
167
Antero Resources
AR
$11.5B
$38.8M 0.11%
959,051
-475,096
-33% -$18.2M
VRTX icon
168
Vertex Pharmaceuticals
VRTX
$133B
$38.5M 0.11%
79,332
+1,800
+2% +$839K
FCPT icon
169
Four Corners Property Trust
FCPT
$2.74B
$38.4M 0.11%
1,337,789
-61,657
-4% -$1.72M
HR icon
170
Healthcare Realty
HR
$6.58B
$38.3M 0.11%
2,264,794
+371,529
+20% +$6.17M
CACI icon
171
CACI
CACI
$15B
$38.1M 0.11%
103,958
+72,324
+229% +$27.7M
EWBC icon
172
East-West Bancorp
EWBC
$18.5B
$38M 0.11%
422,973
-67,436
-14% -$6.43M
LLY icon
173
Eli Lilly
LLY
$1.09T
$37.8M 0.11%
45,822
+467
+1% +$389K
ABM icon
174
ABM Industries
ABM
$2.84B
$37.1M 0.1%
782,810
-36,000
-4% -$1.85M
AL
175
DELISTED
Air Lease Corp
AL
$36.9M 0.1%
764,644
-34,834
-4% -$1.63M
5 6
7
8 9

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William Blair Investment Management's Q1 2025 Portfolio in Review

As of Q1 2025, William Blair Investment Management held 469 positions worth $35.6B, down 13% from $40.9B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair Investment Management withdrew a net $1.91B in Q1 2025, closing 46 positions and reducing 269 holdings. Its most notable exit was Penumbra, an estimated $210M position sold in full.

By sector, the portfolio is most concentrated in Technology at 33% of assets, down from 34% a quarter earlier, followed by Consumer Discretionary and Financials.

Against the trend, William Blair Investment Management opened a new position in Waystar Holding Corp worth $158M.

  • William Blair Investment Management's largest Q1 2025 buy was Waystar Holding Corp: 4,227,425 shares worth $158M.
  • William Blair Investment Management added most to Broadcom in Q1 2025, an estimated $515M increase.
  • William Blair Investment Management's biggest Q1 2025 reduction was Advanced Micro Devices, cutting an estimated $229M.
  • William Blair Investment Management fully exited Penumbra in Q1 2025, selling an estimated $210M.
  • William Blair Investment Management's ten largest holdings make up 27% of its $35.6B portfolio in Q1 2025.
  • William Blair Investment Management opened 36 new positions and closed 46 in Q1 2025.
  • William Blair Investment Management's portfolio value fell 13% quarter-over-quarter to $35.6B.

Based on William Blair Investment Management's 13F filing for Q1 2025, filed 9 May 2025.