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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
AIN icon
151
Albany International
AIN
$1.81B
$51.7M 0.13%
647,095
-70,385
-10% -$5.53M
WGS icon
152
GeneDx Holdings
WGS
$2.44B
$51.5M 0.13%
+669,995
New +$46.8M
CB icon
153
Chubb
CB
$134B
$51.4M 0.13%
186,045
+932
+0.5% +$265K
AR icon
154
Antero Resources
AR
$11.5B
$50.3M 0.12%
1,434,147
+59,439
+4% +$1.8M
ABCB icon
155
Ameris Bancorp
ABCB
$5.93B
$49.4M 0.12%
789,271
+19,150
+2% +$1.26M
TCBI icon
156
Texas Capital Bancshares
TCBI
$4.37B
$49.1M 0.12%
627,890
+15,320
+3% +$1.24M
WK icon
157
Workiva
WK
$3.71B
$48.8M 0.12%
445,628
+49,549
+13% +$4.57M
ADC icon
158
Agree Realty
ADC
$9.25B
$48.7M 0.12%
691,517
+180
+0% +$13.4K
COLB icon
159
Columbia Banking Systems
COLB
$9.04B
$47.9M 0.12%
1,774,443
+42,527
+2% +$1.22M
TMHC
160
DELISTED
Taylor Morrison
TMHC
$47.8M 0.12%
781,005
+18,903
+2% +$1.29M
GPOR icon
161
Gulfport Energy Corp
GPOR
$3B
$47M 0.11%
255,017
+5,980
+2% +$960K
EWBC icon
162
East-West Bancorp
EWBC
$18.4B
$47M 0.11%
490,409
-125,024
-20% -$12.3M
OMF icon
163
OneMain Financial
OMF
$7.35B
$46.2M 0.11%
+886,149
New +$45.9M
WLY icon
164
John Wiley & Sons Class A
WLY
$2.51B
$46M 0.11%
1,053,035
+25,667
+2% +$1.26M
YPF icon
165
YPF Sociedad Anonima American Depositary Shares (Each representing ten (10) Class D shares of Capital Stock)
YPF
$19B
$45.7M 0.11%
+1,074,249
New +$35.2M
BCPC
166
Balchem Corp
BCPC
$5.67B
$44.7M 0.11%
274,545
+38,806
+16% +$6.73M
KN icon
167
Knowles
KN
$3.32B
$44.4M 0.11%
2,226,761
+54,404
+3% +$1.01M
ISRG icon
168
Intuitive Surgical
ISRG
$142B
$44.1M 0.11%
84,470
-604,245
-88% -$315M
LZB icon
169
La-Z-Boy
LZB
$1.66B
$43.5M 0.11%
999,523
+24,125
+2% +$1.02M
EBC icon
170
Eastern Bankshares
EBC
$5.32B
$43.2M 0.11%
2,505,539
+60,746
+2% +$1.06M
CODI icon
171
Compass Diversified
CODI
$898M
$43.1M 0.11%
1,866,533
+45,725
+3% +$1.03M
KRG icon
172
Kite Realty
KRG
$5.28B
$43M 0.1%
1,702,276
-198,898
-10% -$5.23M
CTRE icon
173
CareTrust REIT
CTRE
$9.26B
$42.4M 0.1%
1,567,009
+37,963
+2% +$1.13M
BANR icon
174
Banner Corp
BANR
$2.48B
$42.4M 0.1%
634,579
+628,426
+10,213% +$43M
ABM icon
175
ABM Industries
ABM
$2.82B
$41.9M 0.1%
818,810
+19,783
+2% +$1.08M
5 6
7
8 9

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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.