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William Blair Investment Management Portfolio holdings
AUM
$30.3B
1-Year Est. Return
33.75%
This Fund
S&P 500
This Quarter
Est. Return
+17.18%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+788.31%
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 | |
|---|---|---|---|---|---|---|
|
51
Oracle
ORCL
$419B
| $188M | 0.5% |
+861,343
| New | +$139M |
|
52
Lam Research
LRCX
$390B
| $186M | 0.49% |
1,908,368
-1,415,512
| -43% | -$112M |
|
53
Brookfield Asset Management
BAM
$88.4B
| $185M | 0.49% |
3,345,539
-409,579
| -11% | -$22M |
|
54
Mueller Industries
MLI
$15.1B
| $184M | 0.49% |
4,639,138
-72,804
| -2% | -$2.75M |
|
55
Q2 Holdings
QTWO
$3.95B
| $184M | 0.49% |
1,965,859
-1,328
| -0.1% | -$112K |
|
56
Insulet
PODD
$10B
| $183M | 0.49% |
583,139
-45,398
| -7% | -$13.1M |
|
57
Western Alliance Bancorporation
WAL
$8.89B
| $180M | 0.48% |
2,313,336
+20,704
| +0.9% | +$1.49M |
|
58
ACV Auctions
ACVA
$1.27B
| $180M | 0.48% |
11,109,706
+32,797
| +0.3% | +$510K |
|
59
Manhattan Associates
MANH
$11.4B
| $179M | 0.48% |
908,334
-291,677
| -24% | -$52.9M |
|
60
Bright Horizons
BFAM
$3.76B
| $179M | 0.47% |
1,446,121
-764,976
| -35% | -$93.8M |
|
61
Royal Bank of Canada
RY
$292B
| $178M | 0.47% |
1,353,389
-320,806
| -19% | -$39.2M |
|
62
Veeva Systems
VEEV
$38.4B
| $178M | 0.47% |
616,742
-11,549
| -2% | -$2.86M |
|
63
Curtiss-Wright
CW
$26.1B
| $177M | 0.47% |
362,222
-122,990
| -25% | -$48.5M |
|
64
Brink's
BCO
$4.69B
| $175M | 0.47% |
1,962,981
-256,597
| -12% | -$22.3M |
|
65
Pool Corp
POOL
$7.32B
| $171M | 0.45% |
586,310
+71,373
| +14% | +$21.6M |
|
66
Encompass Health
EHC
$12.4B
| $170M | 0.45% |
1,383,768
-379,700
| -22% | -$43.4M |
|
67
AppFolio
APPF
$7.19B
| $169M | 0.45% |
733,428
+310,834
| +74% | +$67.8M |
|
68
Insmed
INSM
$29B
| $168M | 0.44% |
1,665,602
-647,615
| -28% | -$49.5M |
|
69
Chemed
CHE
$7.02B
| $165M | 0.44% |
339,086
-102,464
| -23% | -$58.4M |
|
|
70
Stride
LRN
$3.29B
| $160M | 0.42% |
1,101,051
-1,218,542
| -53% | -$176M |
|
71
Martin Marietta Materials
MLM
$33.3B
| $157M | 0.42% |
286,715
-6,037
| -2% | -$3.19M |
|
|
72
Maplebear
CART
$11.4B
| $151M | 0.4% |
+3,345,792
| New | +$145M |
|
|
MZTI
73
The Marzetti Company
MZTI
$3.15B
| $151M | 0.4% |
873,357
+153,052
| +21% | +$26.4M |
|
74
GeneDx Holdings
WGS
$2.44B
| $151M | 0.4% |
1,631,402
+442,414
| +37% | +$34.7M |
|
75
WillScot Mobile Mini Holdings
WSC
$4.15B
| $150M | 0.4% |
5,462,958
+180,797
| +3% | +$4.82M |
|
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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.