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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
+3.11%
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
$35.9B
AUM Growth
-$2.82B
Cap. Flow
-$3B
Cap. Flow %
-8.37%
Top 10 Hldgs %
32.55%
Holding
459
New
45
Increased
106
Reduced
259
Closed
46

Top Buys

Rank Stock Value
1
SNOW icon
Snowflake
SNOW
+$202M
2
ARGX icon
argenx
ARGX
+$191M
3
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$191M
4
HQY icon
HealthEquity
HQY
+$178M
5
FFIV icon
F5
FFIV
+$148M

Top Sells

Rank Stock Value
1
LRCX icon
Lam Research
LRCX
+$270M
2
CIEN icon
Ciena
CIEN
+$260M
3
UBER icon
Uber
UBER
+$233M
4
LYV icon
Live Nation Entertainment
LYV
+$229M
5
LRN icon
Stride
LRN
+$225M

Sector Composition

Rank Sector Weight
1 Technology 37.93%
2 Financials 12.94%
3 Healthcare 12.67%
4 Consumer Discretionary 10.8%
5 Industrials 9.43%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
STEP icon
151
StepStone Group
STEP
$4.28B
$43M 0.12%
670,192
+46,273
+7% +$2.93M
SMPL icon
152
Simply Good Foods
SMPL
$989M
$42.7M 0.12%
2,124,640
+469,903
+28% +$9.78M
TCBI icon
153
Texas Capital Bancshares
TCBI
$4.38B
$42.4M 0.12%
468,000
+68,539
+17% +$6.02M
CECO icon
154
Ceco Environmental
CECO
$4.5B
$42.3M 0.12%
706,273
+20,531
+3% +$1.1M
BANR icon
155
Banner Corp
BANR
$2.5B
$41.6M 0.12%
664,138
-45,527
-6% -$2.87M
PODD icon
156
Insulet
PODD
$10.2B
$41.4M 0.12%
145,811
-147,692
-50% -$46.2M
JBTM
157
JBT Marel
JBTM
$6.1B
$40.6M 0.11%
269,712
-18,792
-7% -$2.65M
CCEP icon
158
Coca-Cola Europacific Partners
CCEP
$47.5B
$40.6M 0.11%
447,848
-44,396
-9% -$4.01M
CACI icon
159
CACI
CACI
$14.8B
$40.5M 0.11%
75,968
-16,555
-18% -$9.36M
HWC icon
160
Hancock Whitney
HWC
$6.37B
$40.4M 0.11%
634,468
+47,297
+8% +$2.87M
SBCF icon
161
Seacoast Banking Corp of Florida
SBCF
$3.48B
$40.3M 0.11%
1,282,535
+59,780
+5% +$1.86M
GPOR icon
162
Gulfport Energy Corp
GPOR
$3.01B
$40M 0.11%
192,340
-19,805
-9% -$3.95M
AUB icon
163
Atlantic Union Bankshares
AUB
$6.09B
$39.2M 0.11%
1,111,244
+89,794
+9% +$3.09M
PDFS icon
164
PDF Solutions
PDFS
$2.13B
$38.8M 0.11%
1,358,481
+9,040
+0.7% +$250K
LTM
165
LATAM Airlines Group S.A.
LTM
$15.1B
$37.9M 0.11%
+702,358
New +$33.3M
CGNX icon
166
Cognex
CGNX
$10.4B
$37.9M 0.11%
1,053,280
+165,005
+19% +$6.68M
EWBC icon
167
East-West Bancorp
EWBC
$18.6B
$37.2M 0.1%
330,834
-23,126
-7% -$2.45M
COLD icon
168
Americold
COLD
$4.32B
$36.9M 0.1%
2,872,561
+12,357
+0.4% +$151K
PI icon
169
Impinj
PI
$5.46B
$36.9M 0.1%
212,003
+11,398
+6% +$2.03M
ITGR icon
170
Integer Holdings
ITGR
$4.25B
$36.7M 0.1%
468,377
+192,956
+70% +$15.4M
REXR icon
171
Rexford Industrial Realty
REXR
$8.12B
$36.2M 0.1%
935,111
+67,276
+8% +$2.77M
HR icon
172
Healthcare Realty
HR
$6.58B
$36.2M 0.1%
2,134,580
-153,811
-7% -$2.74M
ELS icon
173
Equity Lifestyle Properties
ELS
$12.6B
$36.1M 0.1%
596,359
-41,996
-7% -$2.6M
CMC icon
174
Commercial Metals
CMC
$7.98B
$35.8M 0.1%
516,792
-54,039
-9% -$3.38M
AIT icon
175
Applied Industrial Technologies
AIT
$13.2B
$35.4M 0.1%
138,003
+22,446
+19% +$5.74M
5 6
7
8 9

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William Blair Investment Management's Q4 2025 Portfolio in Review

As of Q4 2025, William Blair Investment Management held 459 positions worth $35.9B, down 7.3% from $38.7B the previous quarter. Its ten largest holdings account for 33% of the portfolio.

William Blair Investment Management withdrew a net $3B in Q4 2025, closing 46 positions and reducing 259 holdings. Its most notable exit was Live Nation Entertainment, an estimated $229M position sold in full.

By sector, the portfolio is most concentrated in Technology at 38% of assets, down from 39% a quarter earlier, followed by Financials and Healthcare.

Against the trend, William Blair Investment Management opened a new position in argenx worth $188M.

  • William Blair Investment Management's largest Q4 2025 buy was argenx: 223,666 shares worth $188M.
  • William Blair Investment Management added most to Snowflake in Q4 2025, an estimated $202M increase.
  • William Blair Investment Management's biggest Q4 2025 reduction was Lam Research, cutting an estimated $270M.
  • William Blair Investment Management fully exited Live Nation Entertainment in Q4 2025, selling an estimated $229M.
  • William Blair Investment Management's ten largest holdings make up 33% of its $35.9B portfolio in Q4 2025.
  • William Blair Investment Management opened 45 new positions and closed 46 in Q4 2025.
  • William Blair Investment Management's portfolio value fell 7.3% quarter-over-quarter to $35.9B.

Based on William Blair Investment Management's 13F filing for Q4 2025, filed 9 Feb 2026.