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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
ALSN icon
376
Allison Transmission
ALSN
$10.2B
$502K ﹤0.01%
5,243
+1,492
+40% +$158K
REG icon
377
Regency Centers
REG
$13.9B
$487K ﹤0.01%
6,600
-18
-0.3% -$1.31K
NI icon
378
NiSource
NI
$20.2B
$476K ﹤0.01%
11,864
-1,338
-10% -$51.5K
ALLE icon
379
Allegion
ALLE
$14.1B
$470K ﹤0.01%
3,599
+525
+17% +$67.9K
DOC icon
380
Healthpeak Properties
DOC
$14.4B
$464K ﹤0.01%
22,970
-60
-0.3% -$1.21K
DCI icon
381
Donaldson
DCI
$11.2B
$457K ﹤0.01%
+6,809
New +$471K
JBL icon
382
Jabil
JBL
$39B
$446K ﹤0.01%
3,280
+111
+4% +$17.1K
AXTA icon
383
Axalta
AXTA
$7.97B
$445K ﹤0.01%
13,418
-37
-0.3% -$1.31K
DAR icon
384
Darling Ingredients
DAR
$10B
$439K ﹤0.01%
14,054
-6,390
-31% -$223K
CCK icon
385
Crown Holdings
CCK
$13.1B
$436K ﹤0.01%
4,889
-1,903
-28% -$166K
GPN icon
386
Global Payments
GPN
$24.2B
$430K ﹤0.01%
4,393
-11
-0.2% -$1.15K
G icon
387
Genpact
G
$5.77B
$426K ﹤0.01%
8,450
-3,594
-30% -$178K
RGLD icon
388
Royal Gold
RGLD
$19.3B
$423K ﹤0.01%
2,588
+527
+26% +$77.3K
FLEX icon
389
Flex
FLEX
$46.6B
$419K ﹤0.01%
+12,667
New +$496K
TKR icon
390
Timken Company
TKR
$9.06B
$416K ﹤0.01%
5,789
-16
-0.3% -$1.24K
FLS icon
391
Flowserve
FLS
$10.2B
$411K ﹤0.01%
8,421
+1,919
+30% +$109K
JBHT icon
392
JB Hunt Transport Services
JBHT
$26.4B
$405K ﹤0.01%
2,735
-7
-0.3% -$1.15K
ICLR icon
393
Icon
ICLR
$12.8B
$402K ﹤0.01%
2,300
-6
-0.3% -$1.16K
WEX icon
394
WEX
WEX
$6.75B
$395K ﹤0.01%
2,513
-7
-0.3% -$1.15K
INGR icon
395
Ingredion
INGR
$6.64B
$369K ﹤0.01%
2,729
-7
-0.3% -$925
TFX icon
396
Teleflex
TFX
$5.77B
$366K ﹤0.01%
2,647
-7
-0.3% -$1.13K
CPT icon
397
Camden Property Trust
CPT
$11.1B
$361K ﹤0.01%
2,950
-8
-0.3% -$941
POWI icon
398
Power Integrations
POWI
$3.58B
$354K ﹤0.01%
7,005
-3,183
-31% -$190K
YOU icon
399
Clear Secure
YOU
$4.7B
$346K ﹤0.01%
13,357
-1,401,687
-99% -$34.9M
LH icon
400
Labcorp
LH
$26.3B
$338K ﹤0.01%
1,454
-597
-29% -$145K
14 15
16
17 18

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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.