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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
+5.41%
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
$40.9B
AUM Growth
+$405M
Cap. Flow
-$285M
Cap. Flow %
-0.7%
Top 10 Hldgs %
27.41%
Holding
463
New
51
Increased
220
Reduced
159
Closed
30

Top Buys

Rank Stock Value
1
PRMB
Primo Brands
PRMB
+$331M
2
YUMC icon
Yum China
YUMC
+$240M
3
TLN
Talen Energy Corp
TLN
+$232M
4
MLI icon
Mueller Industries
MLI
+$206M
5
BAM icon
Brookfield Asset Management
BAM
+$203M

Top Sells

Rank Stock Value
1
ISRG icon
Intuitive Surgical
ISRG
+$315M
2
ICLR icon
Icon
ICLR
+$294M
3
ZTS icon
Zoetis
ZTS
+$230M
4
BWXT icon
BWX Technologies
BWXT
+$222M
5
PRMW
Primo Water Corporation
PRMW
+$197M

Sector Composition

Rank Sector Weight
1 Technology 34.12%
2 Consumer Discretionary 14.8%
3 Financials 12.22%
4 Healthcare 11.93%
5 Industrials 10.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WINA icon
226
Winmark
WINA
$1.24B
$33.3M 0.08%
84,803
+12,755
+18% +$5.01M
KLIC icon
227
Kulicke & Soffa
KLIC
$4.98B
$33.1M 0.08%
708,441
+15,010
+2% +$704K
GEF icon
228
Greif
GEF
$5B
$32.8M 0.08%
535,932
+11,210
+2% +$732K
FRME icon
229
First Merchants
FRME
$2.72B
$32.7M 0.08%
820,649
+19,932
+2% +$806K
PPBI
230
DELISTED
Pacific Premier Bancorp
PPBI
$32.7M 0.08%
1,313,437
+30,647
+2% +$812K
SHOO icon
231
Steven Madden
SHOO
$3.49B
$32.6M 0.08%
767,547
+18,668
+2% +$841K
LXP icon
232
LXP Industrial Trust
LXP
$3.58B
$32.6M 0.08%
801,995
+19,438
+2% +$901K
HWC icon
233
Hancock Whitney
HWC
$6.34B
$32.5M 0.08%
594,814
+14,545
+3% +$805K
MTG icon
234
MGIC Investment
MTG
$6.29B
$32.4M 0.08%
1,364,725
+32,980
+2% +$824K
PGR icon
235
Progressive
PGR
$121B
$32.2M 0.08%
134,342
-4,737
-3% -$1.19M
BDC icon
236
Belden
BDC
$5.39B
$32.2M 0.08%
285,634
-123,037
-30% -$14.7M
KFY icon
237
Korn Ferry
KFY
$4.28B
$32.1M 0.08%
476,624
+11,634
+3% +$846K
HR icon
238
Healthcare Realty
HR
$6.58B
$32.1M 0.08%
1,893,265
+495
+0% +$8.7K
SBCF icon
239
Seacoast Banking Corp of Florida
SBCF
$3.44B
$31.9M 0.08%
1,160,182
+27,825
+2% +$783K
HURN icon
240
Huron Consulting
HURN
$2.39B
$31.9M 0.08%
256,971
+6,338
+3% +$743K
SITM icon
241
SiTime
SITM
$20.5B
$31.9M 0.08%
148,605
-23,710
-14% -$4.83M
THS
242
DELISTED
Treehouse Foods
THS
$31.6M 0.08%
898,536
+17,225
+2% +$628K
AAMI
243
Acadian Asset Management
AAMI
$3.27B
$31.4M 0.08%
1,192,974
+28,937
+2% +$811K
SR icon
244
Spire
SR
$4.89B
$31.3M 0.08%
460,769
+11,109
+2% +$744K
VRTX icon
245
Vertex Pharmaceuticals
VRTX
$133B
$31.2M 0.08%
77,532
+983
+1% +$456K
OC icon
246
Owens Corning
OC
$12.3B
$31.1M 0.08%
182,804
-539
-0.3% -$101K
MTDR icon
247
Matador Resources
MTDR
$6.5B
$31M 0.08%
551,106
+11,256
+2% +$620K
IPAR icon
248
Interparfums
IPAR
$3.78B
$30.7M 0.08%
233,724
-180
-0.1% -$23.1K
WAFD icon
249
WaFd
WAFD
$2.79B
$30M 0.07%
929,760
+22,716
+3% +$798K
GVA icon
250
Granite Construction
GVA
$5.52B
$29.7M 0.07%
339,167
+8,230
+2% +$742K
8 9
10
11 12

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William Blair Investment Management's Q4 2024 Portfolio in Review

As of Q4 2024, William Blair Investment Management held 463 positions worth $40.9B, up 1% from $40.5B the previous quarter. Its ten largest holdings account for 27% of the portfolio.

William Blair Investment Management's Q4 2024 filing shows 51 new, 220 increased, 159 reduced and 30 closed positions. Its largest new stake was Primo Brands: 11,161,870 shares worth $343M. The largest sale was Intuitive Surgical, an estimated $315M.

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

  • William Blair Investment Management's largest Q4 2024 buy was Primo Brands: 11,161,870 shares worth $343M.
  • William Blair Investment Management added most to West Pharmaceutical in Q4 2024, an estimated $177M increase.
  • William Blair Investment Management's biggest Q4 2024 reduction was Intuitive Surgical, cutting an estimated $315M.
  • William Blair Investment Management fully exited Primo Water Corporation in Q4 2024, selling an estimated $197M.
  • William Blair Investment Management's ten largest holdings make up 27% of its $40.9B portfolio in Q4 2024.
  • William Blair Investment Management opened 51 new positions and closed 30 in Q4 2024.
  • William Blair Investment Management's portfolio value rose 1% quarter-over-quarter to $40.9B.

Based on William Blair Investment Management's 13F filing for Q4 2024, filed 10 Feb 2025.