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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
PR
401
Permian Resources
PR
$18B
$325K ﹤0.01%
23,470
-1,095
-4% -$15.7K
HST icon
402
Host Hotels & Resorts
HST
$15.6B
$325K ﹤0.01%
22,871
-64
-0.3% -$1.04K
AMBA icon
403
Ambarella
AMBA
$3.66B
$320K ﹤0.01%
6,351
-822,701
-99% -$56.3M
BC icon
404
Brunswick
BC
$5.21B
$292K ﹤0.01%
5,431
-16
-0.3% -$1K
USFD icon
405
US Foods
USFD
$24B
$274K ﹤0.01%
4,191
-3,340
-44% -$228K
KNX icon
406
Knight Transportation
KNX
$11.6B
$272K ﹤0.01%
6,251
-2,222
-26% -$115K
WTW icon
407
Willis Towers Watson
WTW
$31.6B
$269K ﹤0.01%
795
-4
-0.5% -$1.3K
AGCO icon
408
AGCO
AGCO
$7.11B
$267K ﹤0.01%
2,887
-7
-0.2% -$684
STAG icon
409
STAG Industrial
STAG
$7.12B
$265K ﹤0.01%
7,338
-334
-4% -$11.6K
AFG icon
410
American Financial Group
AFG
$12B
$261K ﹤0.01%
1,989
– –
ETR icon
411
Entergy
ETR
$50.3B
$247K ﹤0.01%
2,893
-17
-0.6% -$1.4K
HIG icon
412
Hartford Financial Services
HIG
$37.7B
$245K ﹤0.01%
1,979
-12
-0.6% -$1.38K
VICI icon
413
VICI Properties
VICI
$28.7B
$234K ﹤0.01%
7,180
-44
-0.6% -$1.36K
WBS icon
414
Webster Financial
WBS
$12.8B
$232K ﹤0.01%
4,500
– –
ALK icon
415
Alaska Air
ALK
$5.29B
$226K ﹤0.01%
4,582
-1,726
-27% -$113K
JCI icon
416
Johnson Controls International
JCI
$92.6B
$216K ﹤0.01%
2,702
-15
-0.6% -$1.23K
KKR icon
417
KKR & Co
KKR
$99.5B
$215K ﹤0.01%
1,861
+346
+23% +$47.6K
COR icon
418
Cencora
COR
$60B
$215K ﹤0.01%
+772
New +$194K
STT icon
419
State Street
STT
$52.2B
$204K ﹤0.01%
+2,281
New +$218K
TOL icon
420
Toll Brothers
TOL
$13.9B
$201K ﹤0.01%
+1,908
New +$229K
HBAN icon
421
Huntington Bancshares
HBAN
$36.1B
$178K ﹤0.01%
11,845
-68
-0.6% -$1.1K
HPE icon
422
Hewlett Packard
HPE
$77.8B
$158K ﹤0.01%
+10,254
New +$204K
IWP icon
423
iShares Russell Mid-Cap Growth ETF
IWP
$21B
$101K ﹤0.01%
+860
New +$111K
AAP icon
424
Advance Auto Parts
AAP
$3.23B
– –
-4,479
Closed -$212K
ADNT icon
425
Adient
ADNT
$1.44B
– –
-817,502
Closed -$14.1M
15 16
17
18 19

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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.