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William Blair Investment Management Portfolio holdings
AUM
$33.3B
1-Year Est. Return
44.76%
This Fund
S&P 500
This Quarter
Est. Return
+17.18%
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
$37.7B
AUM Growth
+$2.06B
(+5.8%)
Cap. Flow
-$2.27B
Cap. Flow
% of AUM
-6.03%
Top 10 Holdings %
Top 10 Hldgs %
30.35%
Holding
461
New
38
Increased
117
Reduced
257
Closed
44
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
BWX Technologies
BWXT
|
+$149M |
| 2 |
Maplebear
CART
|
+$145M |
| 3 |
BellRing Brands
BRBR
|
+$144M |
| 4 |
Oracle
ORCL
|
+$139M |
| 5 |
P
Everpure Inc
P
|
+$130M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Yum China
YUMC
|
+$217M |
| 2 |
Palo Alto Networks
PANW
|
+$192M |
| 3 |
e.l.f. Beauty
ELF
|
+$177M |
| 4 |
Stride
LRN
|
+$176M |
| 5 |
GTLS
Chart Industries
GTLS
|
+$153M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 35.89% |
| 2 | Consumer Discretionary | 15.09% |
| 3 | Financials | 13.13% |
| 4 | Healthcare | 10.3% |
| 5 | Industrials | 9.46% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
101
Clean Harbors
CLH
$16.4B
| $95.1M | 0.25% |
+411,432
| New | +$90.1M |
|
102
Nu Holdings
NU
$65.9B
| $94.3M | 0.25% |
6,874,531
+585,621
| +9% | +$7.01M |
|
103
Churchill Downs
CHDN
$6.18B
| $94.1M | 0.25% |
931,801
-17,914
| -2% | -$1.75M |
|
104
Nice
NICE
$5.95B
| $93M | 0.25% |
550,714
-159,952
| -23% | -$25.8M |
|
105
TPG
TPG
$8.12B
| $91.4M | 0.24% |
1,742,956
-32,557
| -2% | -$1.56M |
|
106
Diebold Nixdorf
DBD
$2.4B
| $89.9M | 0.24% |
1,622,642
+140,290
| +9% | +$6.58M |
|
107
FirstService
FSV
$6.3B
| $89.3M | 0.24% |
511,487
+5,542
| +1% | +$960K |
|
108
Paylocity
PCTY
$7.7B
| $86.6M | 0.23% |
477,895
-209,110
| -30% | -$39.3M |
|
109
Advanced Micro Devices
AMD
$774B
| $86.1M | 0.23% |
606,904
+551,021
| +986% | +$60M |
|
110
Louisiana-Pacific
LPX
$5.28B
| $84M | 0.22% |
976,348
-13,114
| -1% | -$1.17M |
|
|
FOLD
111
DELISTED
Amicus Therapeutics
FOLD
| $83.9M | 0.22% |
14,642,157
-136,494
| -0.9% | -$881K |
|
112
Gogo Inc
GOGO
$392M
| $83.3M | 0.22% |
5,673,833
+3,149,585
| +125% | +$32M |
|
113
National Vision
EYE
$1.77B
| $81.9M | 0.22% |
+3,559,690
| New | +$60.7M |
|
114
West Pharmaceutical
WST
$24.7B
| $80.1M | 0.21% |
366,152
+13,314
| +4% | +$2.85M |
|
115
First Horizon
FHN
$12B
| $79.8M | 0.21% |
+3,763,010
| New | +$71.7M |
|
116
HDFC Bank
HDB
$120B
| $77.6M | 0.21% |
2,023,416
-295,180
| -13% | -$10.7M |
|
117
Chubb
CB
$134B
| $77.4M | 0.21% |
267,172
+7,487
| +3% | +$2.15M |
|
118
Burlington
BURL
$22.6B
| $73.9M | 0.2% |
317,729
-5,915
| -2% | -$1.41M |
|
119
Idacorp
IDA
$8.11B
| $73.6M | 0.2% |
637,110
+160,717
| +34% | +$18.6M |
|
120
BBB Foods
TBBB
$5B
| $73.3M | 0.19% |
2,639,241
-633,836
| -19% | -$17.8M |
|
121
Reliance Steel & Aluminium
RS
$21.6B
| $72.4M | 0.19% |
+230,562
| New | +$68.1M |
|
122
Tecnoglass Holdings Inc.
TGLS
$1.9B
| $71M | 0.19% |
917,392
-63,544
| -6% | -$4.93M |
|
123
Merit Medical Systems
MMSI
$5.44B
| $69.1M | 0.18% |
739,600
+137,956
| +23% | +$13.1M |
|
124
Arch Capital
ACGL
$33.5B
| $68.5M | 0.18% |
752,324
+28,175
| +4% | +$2.6M |
|
125
Verra Mobility
VRRM
$726M
| $65.6M | 0.17% |
2,582,884
+352,942
| +16% | +$8.22M |
|
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William Blair Investment Management's Q2 2025 Portfolio in Review
As of Q2 2025, William Blair Investment Management held 461 positions worth $37.7B, up 5.8% from $35.6B the previous quarter. Its ten largest holdings account for 30% of the portfolio.
William Blair Investment Management withdrew a net $2.27B in Q2 2025, closing 44 positions and reducing 257 holdings. Its most notable exit was The AZEK Co, an estimated $123M position sold in full.
By sector, the portfolio is most concentrated in Technology at 36% of assets, up from 33% a quarter earlier, followed by Consumer Discretionary and Financials.
Against the trend, William Blair Investment Management opened a new position in Maplebear worth $151M.
- William Blair Investment Management's largest Q2 2025 buy was Maplebear: 3,345,792 shares worth $151M.
- William Blair Investment Management added most to BWX Technologies in Q2 2025, an estimated $149M increase.
- William Blair Investment Management's biggest Q2 2025 reduction was Yum China, cutting an estimated $217M.
- William Blair Investment Management fully exited The AZEK Co in Q2 2025, selling an estimated $123M.
- William Blair Investment Management's ten largest holdings make up 30% of its $37.7B portfolio in Q2 2025.
- William Blair Investment Management opened 38 new positions and closed 44 in Q2 2025.
- William Blair Investment Management's portfolio value rose 5.8% quarter-over-quarter to $37.7B.
Based on William Blair Investment Management's 13F filing for Q2 2025, filed 29 Jul 2025.