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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
RY icon
126
Royal Bank of Canada
RY
$297B
$70.4M 0.17%
+584,867
New +$72.2M
ITUB icon
127
Itaú Unibanco
ITUB
$81.6B
$69.9M 0.17%
15,973,191
-32,806,648
-67% -$169M
VCEL icon
128
Vericel Corp
VCEL
$2.29B
$69.1M 0.17%
1,258,416
+501,736
+66% +$25.4M
VRRM icon
129
Verra Mobility
VRRM
$714M
$69M 0.17%
2,854,284
+181,072
+7% +$4.49M
GTX icon
130
Garrett Motion
GTX
$5.47B
$66.8M 0.16%
7,392,597
-2,129,199
-22% -$17.7M
MMSI icon
131
Merit Medical Systems
MMSI
$5.45B
$66.4M 0.16%
687,031
-751,501
-52% -$74.9M
SKY icon
132
Champion Homes
SKY
$5.1B
$65M 0.16%
737,626
-336,066
-31% -$32.5M
KOS icon
133
Kosmos Energy
KOS
$1.49B
$64.1M 0.16%
18,743,734
+4,114,499
+28% +$15.7M
NU icon
134
Nu Holdings
NU
$65.5B
$62.4M 0.15%
6,026,222
+1,808,315
+43% +$24.1M
PSN icon
135
Parsons
PSN
$5.16B
$61.6M 0.15%
668,140
-208,378
-24% -$21.2M
AMBA icon
136
Ambarella
AMBA
$3.66B
$60.3M 0.15%
829,052
+68,044
+9% +$4.34M
AGYS icon
137
Agilysys
AGYS
$3.03B
$60.2M 0.15%
457,420
-8,429
-2% -$1.03M
TBBB icon
138
BBB Foods
TBBB
$5.1B
$59.9M 0.15%
2,118,138
+170,811
+9% +$5.32M
ACGL icon
139
Arch Capital
ACGL
$33.2B
$57.6M 0.14%
624,055
+157,197
+34% +$15.9M
RRC icon
140
Range Resources
RRC
$9.39B
$57.4M 0.14%
1,594,616
-700,349
-31% -$23.2M
GGAL icon
141
Galicia Financial Group
GGAL
$7.1B
$56.2M 0.14%
901,065
+798,542
+779% +$44M
VIST icon
142
Vista Energy
VIST
$7.31B
$55.3M 0.14%
1,022,172
+222,165
+28% +$11.4M
BMA icon
143
Banco Macro
BMA
$5.1B
$55.2M 0.13%
570,374
+328,800
+136% +$26.9M
DBD icon
144
Diebold Nixdorf
DBD
$2.44B
$54.8M 0.13%
1,272,763
+350,808
+38% +$15.8M
OEC icon
145
Orion
OEC
$364M
$54.7M 0.13%
3,461,950
+602,080
+21% +$10.2M
EVH icon
146
Evolent Health
EVH
$471M
$53.8M 0.13%
4,781,131
-158,175
-3% -$2.78M
TSEM icon
147
Tower Semiconductor
TSEM
$29.4B
$53.5M 0.13%
1,037,788
+25,247
+2% +$1.18M
MIR icon
148
Mirion Technologies
MIR
$3.79B
$53.1M 0.13%
+3,041,016
New +$47.2M
WNS
149
DELISTED
WNS Holdings
WNS
$52.7M 0.13%
1,112,743
+53,433
+5% +$2.64M
ASO icon
150
Academy Sports + Outdoors
ASO
$3.05B
$52.4M 0.13%
+910,869
New +$48M
4 5
6
7 8

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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.