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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
+5.41%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+788.31%
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
SN icon
26
SharkNinja
SN
$26.4B
$275M 0.67%
2,827,340
+590,632
+26% +$60.3M
MRCY icon
27
Mercury Systems
MRCY
$6.55B
$270M 0.66%
6,432,601
-866,911
-12% -$33.1M
DT icon
28
Dynatrace
DT
$14.4B
$264M 0.65%
4,862,487
-135,803
-3% -$7.41M
BFAM icon
29
Bright Horizons
BFAM
$3.76B
$263M 0.64%
2,370,336
+532,644
+29% +$64.1M
ACVA icon
30
ACV Auctions
ACVA
$1.27B
$261M 0.64%
12,099,686
+3,652,871
+43% +$73.9M
CWAN
31
DELISTED
Clearwater Analytics
CWAN
$259M 0.63%
9,411,306
-971,876
-9% -$27.6M
LRN icon
32
Stride
LRN
$3.29B
$256M 0.63%
2,467,019
+375,686
+18% +$35.7M
AMD icon
33
Advanced Micro Devices
AMD
$774B
$256M 0.62%
2,118,127
-333,754
-14% -$48M
RACE icon
34
Ferrari
RACE
$72.1B
$253M 0.62%
594,657
+35,525
+6% +$16M
CHE icon
35
Chemed
CHE
$7.02B
$251M 0.61%
473,523
-12,259
-3% -$6.91M
LRCX icon
36
Lam Research
LRCX
$390B
$246M 0.6%
3,410,320
+315,500
+10% +$23.9M
YUMC icon
37
Yum China
YUMC
$16.3B
$244M 0.6%
+5,063,332
New +$240M
TLN
38
Talen Energy Corp
TLN
$17.1B
$240M 0.59%
+1,191,166
New +$232M
SE icon
39
Sea Limited
SE
$80.5B
$237M 0.58%
2,233,158
+547,509
+32% +$57.5M
NFE icon
40
New Fortress Energy
NFE
$94.1M
$235M 0.57%
15,567,055
+4,509,177
+41% +$46.7M
LYV icon
41
Live Nation Entertainment
LYV
$42.7B
$234M 0.57%
1,809,949
+284,623
+19% +$35.8M
EG icon
42
Everest Group
EG
$14B
$233M 0.57%
642,813
+61,026
+10% +$22.9M
APO icon
43
Apollo Global Management
APO
$82.8B
$231M 0.56%
1,399,360
-334,048
-19% -$52.9M
PANW icon
44
Palo Alto Networks
PANW
$313B
$230M 0.56%
1,263,629
-321,769
-20% -$60.8M
SHOP icon
45
Shopify
SHOP
$196B
$229M 0.56%
2,150,751
+347,230
+19% +$33.8M
EXLS icon
46
EXL Service
EXLS
$5.29B
$229M 0.56%
5,152,040
-1,328,655
-21% -$57.5M
MLM icon
47
Martin Marietta Materials
MLM
$33.3B
$226M 0.55%
438,202
+22,727
+5% +$12.9M
UBER icon
48
Uber
UBER
$160B
$225M 0.55%
3,722,571
-1,224,586
-25% -$87.4M
A icon
49
Agilent Technologies
A
$42.2B
$223M 0.54%
1,660,319
-1,599
-0.1% -$219K
BCO icon
50
Brink's
BCO
$4.69B
$216M 0.53%
2,323,668
-432,397
-16% -$43.2M
1
2
3 4 5

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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.