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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
TKR icon
401
Timken Company
TKR
$9.03B
$414K ﹤0.01%
5,805
+7
+0.1% +$550
ALK icon
402
Alaska Air
ALK
$5.29B
$408K ﹤0.01%
6,308
-5,013
-44% -$264K
MIDD icon
403
Middleby
MIDD
$5.38B
$407K ﹤0.01%
3,006
+4
+0.1% +$552
ALSN icon
404
Allison Transmission
ALSN
$10.2B
$405K ﹤0.01%
3,751
-939
-20% -$103K
HST icon
405
Host Hotels & Resorts
HST
$15.6B
$402K ﹤0.01%
22,935
+29
+0.1% +$521
ALLE icon
406
Allegion
ALLE
$14.1B
$402K ﹤0.01%
3,074
+4
+0.1% +$566
SHLS icon
407
Shoals Technologies Group
SHLS
$1.4B
$378K ﹤0.01%
68,406
-1,867,411
-96% -$9.48M
SNA icon
408
Snap-on
SNA
$21.1B
$378K ﹤0.01%
1,114
-407
-27% -$137K
INGR icon
409
Ingredion
INGR
$6.54B
$376K ﹤0.01%
2,736
-935
-25% -$132K
FLS icon
410
Flowserve
FLS
$10.3B
$374K ﹤0.01%
6,502
-2,984
-31% -$171K
WHR icon
411
Whirlpool
WHR
$2.79B
$370K ﹤0.01%
3,234
+3
+0.1% +$331
PR
412
Permian Resources
PR
$18B
$353K ﹤0.01%
24,565
-6,950
-22% -$101K
BC icon
413
Brunswick
BC
$5.21B
$352K ﹤0.01%
5,447
+2,043
+60% +$160K
CPT icon
414
Camden Property Trust
CPT
$10.9B
$343K ﹤0.01%
2,958
+4
+0.1% +$479
QRVO icon
415
Qorvo
QRVO
$8.67B
$320K ﹤0.01%
4,573
+3
+0.1% +$240
SLGN icon
416
Silgan Holdings
SLGN
$4.3B
$279K ﹤0.01%
5,362
– –
AFG icon
417
American Financial Group
AFG
$12B
$272K ﹤0.01%
1,989
+482
+32% +$66.3K
RGLD icon
418
Royal Gold
RGLD
$19.7B
$272K ﹤0.01%
2,061
+2
+0.1% +$289
AGCO icon
419
AGCO
AGCO
$7.11B
$271K ﹤0.01%
2,894
-823
-22% -$79.7K
STAG icon
420
STAG Industrial
STAG
$7.12B
$259K ﹤0.01%
7,672
+635
+9% +$23.2K
WTW icon
421
Willis Towers Watson
WTW
$31.6B
$250K ﹤0.01%
799
– –
WBS icon
422
Webster Financial
WBS
$12.8B
$248K ﹤0.01%
4,500
-1,101
-20% -$60.5K
PPL
423
PPL Corp
PPL
$26.7B
$231K ﹤0.01%
7,116
+18
+0.3% +$593
KKR icon
424
KKR & Co
KKR
$99.5B
$224K ﹤0.01%
1,515
-547
-27% -$80.3K
ETR icon
425
Entergy
ETR
$50.3B
$221K ﹤0.01%
2,910
-290
-9% -$20.9K
15 16
17
18 19

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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.