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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
GXO icon
326
GXO Logistics
GXO
$5.52B
$15.5M 0.04%
356,910
-113,594
-24% -$6.25M
SHC icon
327
Sotera Health
SHC
$5.39B
$15.4M 0.04%
1,127,583
-864
-0.1% -$12.5K
EMBC icon
328
Embecta
EMBC
$269M
$15.3M 0.04%
+739,461
New +$12.1M
AJG icon
329
Arthur J. Gallagher & Co
AJG
$65.5B
$14.9M 0.04%
+52,624
New +$15.3M
KNSL icon
330
Kinsale Capital Group
KNSL
$8.51B
$14.8M 0.04%
+31,767
New +$15M
MYE icon
331
Myers Industries
MYE
$1.23B
$14.5M 0.04%
1,310,361
-20,150
-2% -$243K
ADNT icon
332
Adient
ADNT
$1.44B
$14.1M 0.03%
817,502
+8,645
+1% +$173K
TITN icon
333
Titan Machinery
TITN
$431M
$13M 0.03%
920,090
+17,689
+2% +$256K
CACI icon
334
CACI
CACI
$15B
$12.8M 0.03%
31,634
-28,225
-47% -$13.8M
ASR icon
335
Grupo Aeroportuario del Sureste
ASR
$8.24B
$12.7M 0.03%
49,333
-1,576
-3% -$423K
HIMS icon
336
Hims & Hers Health
HIMS
$6.99B
$12.3M 0.03%
+506,706
New +$12.6M
ABT icon
337
Abbott
ABT
$192B
$11.9M 0.03%
105,057
-3,586
-3% -$414K
KRNT icon
338
Kornit Digital
KRNT
$817M
$11.9M 0.03%
383,252
-932,065
-71% -$26.7M
QTRX icon
339
Quanterix
QTRX
$139M
$11.3M 0.03%
+1,062,105
New +$12.9M
IWO icon
340
iShares Russell 2000 Growth ETF
IWO
$15B
$9.65M 0.02%
33,512
-9,302
-22% -$2.75M
WDAY icon
341
Workday
WDAY
$43.3B
$9.12M 0.02%
35,355
-1,181
-3% -$302K
LAR
342
Lithium Argentina AG
LAR
$1.12B
$8.46M 0.02%
3,230,750
+58,481
+2% +$190K
EAF icon
343
GrafTech
EAF
$201M
$7.72M 0.02%
446,191
+9,373
+2% +$175K
TYL icon
344
Tyler Technologies
TYL
$13B
$6.25M 0.02%
10,831
-308,841
-97% -$187M
MDB icon
345
MongoDB
MDB
$35.2B
$6.02M 0.01%
25,840
-1,807
-7% -$510K
TGS icon
346
Transportadora de Gas del Sur
TGS
$4.23B
$5.25M 0.01%
+179,225
New +$4.52M
EDN
347
Edenor
EDN
$994M
$5.01M 0.01%
+116,791
New +$3.99M
HUM icon
348
Humana
HUM
$46.7B
$4.58M 0.01%
18,045
+2,172
+14% +$583K
ETN icon
349
Eaton
ETN
$179B
$4.26M 0.01%
+12,850
New +$4.51M
SAP icon
350
SAP
SAP
$236B
$4.26M 0.01%
17,286
-3,109
-15% -$740K
12 13
14
15 16

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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.