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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
GKOS icon
101
Glaukos
GKOS
$10.8B
$121M 0.3%
+809,589
New +$112M
TPG icon
102
TPG
TPG
$8.07B
$121M 0.29%
1,920,311
-698,394
-27% -$45.9M
WMS icon
103
Advanced Drainage Systems
WMS
$10.5B
$120M 0.29%
1,040,099
-103,380
-9% -$14.3M
ONB icon
104
Old National Bancorp
ONB
$10.3B
$119M 0.29%
5,493,490
+3,474,578
+172% +$72.3M
SPOT icon
105
Spotify
SPOT
$101B
$117M 0.29%
+261,255
New +$112M
RVLV icon
106
Revolve Group
RVLV
$1.7B
$117M 0.28%
3,482,852
-1,637,349
-32% -$50.7M
MDGL icon
107
Madrigal Pharmaceuticals
MDGL
$12.5B
$115M 0.28%
+371,771
New +$105M
LPX icon
108
Louisiana-Pacific
LPX
$5.16B
$110M 0.27%
1,060,762
-27,703
-3% -$3.01M
IBN icon
109
ICICI Bank
IBN
$107B
$107M 0.26%
3,589,675
+84,344
+2% +$2.55M
GWRE icon
110
Guidewire Software
GWRE
$14.3B
$106M 0.26%
627,361
-493,707
-44% -$92.2M
MMYT icon
111
MakeMyTrip
MMYT
$5.72B
$105M 0.26%
935,751
+34,919
+4% +$3.74M
TENB icon
112
Tenable Holdings
TENB
$4.06B
$104M 0.25%
2,640,029
-1,433,485
-35% -$59.4M
EXP icon
113
Eagle Materials
EXP
$6.42B
$102M 0.25%
413,188
-172,997
-30% -$49.9M
GMED icon
114
Globus Medical
GMED
$11.3B
$102M 0.25%
1,232,643
-344,020
-22% -$27.1M
VRNS icon
115
Varonis Systems
VRNS
$4.85B
$102M 0.25%
2,290,114
+52,971
+2% +$2.76M
AVTR icon
116
Avantor
AVTR
$9.27B
$100M 0.24%
4,748,915
-116,501
-2% -$2.62M
BURL icon
117
Burlington
BURL
$22.2B
$99.8M 0.24%
350,110
-53,097
-13% -$14.3M
TEVA icon
118
Teva Pharmaceuticals
TEVA
$42.8B
$93.5M 0.23%
4,241,547
-105,451
-2% -$1.92M
LSCC icon
119
Lattice Semiconductor
LSCC
$18.3B
$93.4M 0.23%
1,649,212
-1,745,659
-51% -$95.8M
FOXF icon
120
Fox Factory Holding Corp
FOXF
$887M
$90.3M 0.22%
2,983,482
+434,998
+17% +$15M
BAP icon
121
Credicorp
BAP
$29.8B
$87.8M 0.21%
478,867
+67,602
+16% +$12.6M
TGLS icon
122
Tecnoglass Holdings Inc.
TGLS
$1.88B
$81.6M 0.2%
1,028,174
-593,029
-37% -$45.1M
MRX
123
Marex Group Limited Ordinary Shares
MRX
$4.87B
$78.1M 0.19%
2,504,726
+1,067,136
+74% +$29.9M
TECH icon
124
Bio-Techne
TECH
$11.2B
$77.4M 0.19%
1,074,883
-35,352
-3% -$2.6M
CP icon
125
Canadian Pacific Kansas City
CP
$81.2B
$74.7M 0.18%
1,032,180
-1,342,915
-57% -$103M
3 4
5
6 7

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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.