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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
EHC icon
76
Encompass Health
EHC
$12.3B
$172M 0.42%
1,862,219
-1,441,607
-44% -$142M
BPMC
77
DELISTED
Blueprint Medicines
BPMC
$170M 0.41%
1,944,695
+269,896
+16% +$24.7M
INSM icon
78
Insmed
INSM
$29.4B
$168M 0.41%
2,433,443
+12,535
+0.5% +$903K
VEEV icon
79
Veeva Systems
VEEV
$38.3B
$167M 0.41%
796,304
+120,661
+18% +$26.5M
INSP icon
80
Inspire Medical Systems
INSP
$1.67B
$167M 0.41%
902,611
-3,738
-0.4% -$726K
EPAM icon
81
EPAM Systems
EPAM
$5.1B
$167M 0.41%
+713,824
New +$159M
NICE icon
82
Nice
NICE
$5.77B
$163M 0.4%
958,733
-170,799
-15% -$30.4M
AZEK
83
DELISTED
The AZEK Co
AZEK
$162M 0.4%
3,407,329
-136,522
-4% -$6.52M
HDB icon
84
HDFC Bank
HDB
$119B
$159M 0.39%
4,978,302
-355,938
-7% -$11.4M
GOOGL icon
85
Alphabet (Google) Class A
GOOGL
$4.17T
$157M 0.38%
830,704
-111,906
-12% -$19.6M
P
86
Everpure Inc
P
$36.1B
$155M 0.38%
2,525,208
+2,386,864
+1,725% +$133M
BWXT icon
87
BWX Technologies
BWXT
$15.6B
$150M 0.37%
1,351,036
-1,813,026
-57% -$222M
AVGO icon
88
Broadcom
AVGO
$2T
$150M 0.37%
647,615
+433,787
+203% +$80.2M
NOVT icon
89
Novanta
NOVT
$6.32B
$149M 0.36%
975,841
+11,361
+1% +$1.92M
FOLD
90
DELISTED
Amicus Therapeutics
FOLD
$147M 0.36%
15,597,698
+14,736
+0.1% +$153K
MZTI
91
The Marzetti Company
MZTI
$3.16B
$145M 0.35%
838,368
-134,118
-14% -$24.5M
ACHC icon
92
Acadia Healthcare
ACHC
$2.97B
$144M 0.35%
3,628,043
-1,661
-0% -$74.9K
FLUT icon
93
Flutter Entertainment
FLUT
$16.9B
$138M 0.34%
+533,788
New +$135M
CHDN icon
94
Churchill Downs
CHDN
$6.11B
$138M 0.34%
1,032,920
-33,632
-3% -$4.66M
TWST icon
95
Twist Bioscience
TWST
$7.77B
$137M 0.33%
2,949,723
-527,572
-15% -$23.8M
FSV icon
96
FirstService
FSV
$6.21B
$134M 0.33%
737,551
-128,601
-15% -$24M
CW icon
97
Curtiss-Wright
CW
$26.6B
$133M 0.32%
+373,730
New +$135M
RRX icon
98
Regal Rexnord
RRX
$11.4B
$132M 0.32%
847,841
-36,633
-4% -$6.19M
FRPT icon
99
Freshpet
FRPT
$3.5B
$131M 0.32%
886,618
-579,910
-40% -$84.5M
CRDO icon
100
Credo Technology Group
CRDO
$50.5B
$126M 0.31%
1,876,758
-1,127,383
-38% -$56M
2 3
4
5 6

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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.