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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
MSFT icon
1
Microsoft
MSFT
$3.73T
$1.87B 4.56%
4,431,154
-131,324
-3% -$55.9M
NVDA icon
2
NVIDIA
NVDA
$5.38T
$1.78B 4.36%
13,279,405
+520,024
+4% +$71.7M
TSM icon
3
TSMC
TSM
$2.16T
$1.52B 3.72%
7,722,040
-496,086
-6% -$96M
AMZN icon
4
Amazon
AMZN
$2.99T
$1.5B 3.66%
6,834,497
-13,499
-0.2% -$2.76M
AAPL icon
5
Apple
AAPL
$4.55T
$1.28B 3.12%
5,104,490
-604,655
-11% -$143M
META icon
6
Meta Platforms (Facebook)
META
$1.5T
$974M 2.38%
1,663,794
+82,981
+5% +$48.7M
MA icon
7
Mastercard
MA
$499B
$756M 1.85%
1,436,404
+6,685
+0.5% +$3.46M
CG icon
8
Carlyle Group
CG
$17.8B
$669M 1.63%
13,249,941
+1,773,465
+15% +$89.9M
MELI icon
9
Mercado Libre
MELI
$92.3B
$440M 1.07%
258,476
-70,480
-21% -$137M
NOW icon
10
ServiceNow
NOW
$128B
$428M 1.05%
2,020,880
-460,825
-19% -$93.4M
LIN icon
11
Linde
LIN
$227B
$413M 1.01%
985,404
-209,834
-18% -$95.6M
CRM icon
12
Salesforce
CRM
$157B
$394M 0.96%
1,177,866
+21,410
+2% +$6.83M
CPRT icon
13
Copart
CPRT
$26.9B
$383M 0.94%
6,671,424
+889,989
+15% +$50.7M
CMG icon
14
Chipotle Mexican Grill
CMG
$41.8B
$375M 0.92%
6,225,731
+38,212
+0.6% +$2.3M
INTU icon
15
Intuit
INTU
$89.6B
$367M 0.9%
583,581
+56,160
+11% +$35.9M
PRMB
16
Primo Brands
PRMB
$8.62B
$343M 0.84%
+11,161,870
New +$331M
UNH icon
17
UnitedHealth
UNH
$368B
$335M 0.82%
662,775
+50,945
+8% +$28.9M
DOCS icon
18
Doximity
DOCS
$5.86B
$332M 0.81%
6,225,933
-244,283
-4% -$12M
ACN icon
19
Accenture
ACN
$105B
$330M 0.81%
939,423
-199,314
-18% -$71.7M
TRU icon
20
TransUnion
TRU
$15.4B
$313M 0.76%
3,370,742
+789,497
+31% +$80M
COST icon
21
Costco
COST
$419B
$309M 0.75%
337,185
-4,680
-1% -$4.34M
CFLT
22
DELISTED
Confluent
CFLT
$302M 0.74%
10,799,681
-29,609
-0.3% -$794K
ELF icon
23
e.l.f. Beauty
ELF
$5.68B
$289M 0.71%
2,305,349
+669,321
+41% +$80.3M
CWST icon
24
Casella Waste Systems
CWST
$5.7B
$279M 0.68%
2,640,498
-11,614
-0.4% -$1.23M
ORLY icon
25
O'Reilly Automotive
ORLY
$75.7B
$279M 0.68%
3,528,840
-56,475
-2% -$4.55M
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.