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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
DY icon
226
Dycom Industries
DY
$12.3B
$26.7M 0.07%
78,939
-5,492
-7% -$1.73M
HUBG icon
227
HUB Group
HUBG
$2.46B
$26.7M 0.07%
625,894
-65,084
-9% -$2.47M
MIRM icon
228
Mirum Pharmaceuticals
MIRM
$6.04B
$26.6M 0.07%
336,701
+23,442
+7% +$1.68M
SRAD icon
229
Sportradar
SRAD
$3.84B
$26.6M 0.07%
1,118,791
-55,243
-5% -$1.33M
ECVT icon
230
Ecovyst
ECVT
$1.09B
$26.6M 0.07%
2,728,749
-285,411
-9% -$2.49M
KN icon
231
Knowles
KN
$3.33B
$26.4M 0.07%
1,233,346
-312,949
-20% -$7.13M
UMBF icon
232
UMB Financial
UMBF
$11.4B
$26M 0.07%
225,846
-23,280
-9% -$2.64M
AVT icon
233
Avnet
AVT
$7.98B
$25.9M 0.07%
538,841
-54,866
-9% -$2.7M
VVX icon
234
V2X
VVX
$2.55B
$25.7M 0.07%
+470,846
New +$26.5M
VITL icon
235
Vital Farms
VITL
$495M
$25.5M 0.07%
+799,448
New +$28.1M
ELME
236
Elme Communities
ELME
$144M
$25.5M 0.07%
1,463,037
-151,069
-9% -$2.56M
ADC icon
237
Agree Realty
ADC
$9.25B
$25.4M 0.07%
352,710
-25,271
-7% -$1.85M
HAE icon
238
Haemonetics
HAE
$4.16B
$25.2M 0.07%
314,654
-162,056
-34% -$10.9M
PANW icon
239
Palo Alto Networks
PANW
$315B
$25.2M 0.07%
136,848
+43,089
+46% +$8.69M
BDC icon
240
Belden
BDC
$5.39B
$25.1M 0.07%
215,153
-22,143
-9% -$2.58M
AUGO
241
Aura Minerals Inc
AUGO
$6.5B
$25M 0.07%
496,303
+42,091
+9% +$1.65M
ANIP icon
242
ANI Pharmaceuticals
ANIP
$1.73B
$25M 0.07%
316,693
-31,987
-9% -$2.77M
TBBB icon
243
BBB Foods
TBBB
$5.1B
$24.8M 0.07%
742,649
-129,103
-15% -$3.86M
EXTR icon
244
Extreme Networks
EXTR
$3.2B
$24.6M 0.07%
1,479,635
+132,727
+10% +$2.44M
AIN icon
245
Albany International
AIN
$1.81B
$24.5M 0.07%
483,935
-392,520
-45% -$20.3M
GVA icon
246
Granite Construction
GVA
$5.52B
$24.4M 0.07%
211,848
-21,974
-9% -$2.36M
WLY icon
247
John Wiley & Sons Class A
WLY
$2.53B
$24.3M 0.07%
794,900
-83,693
-10% -$2.95M
FCPT icon
248
Four Corners Property Trust
FCPT
$2.74B
$24.3M 0.07%
1,055,836
-109,331
-9% -$2.6M
VERX icon
249
Vertex
VERX
$2B
$24.3M 0.07%
1,215,172
+360,791
+42% +$7.8M
DFIN icon
250
Donnelley Financial Solutions
DFIN
$1.17B
$24.2M 0.07%
518,833
+40,968
+9% +$1.98M
8 9
10
11 12

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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.