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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
+771.69%
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 | |
|---|---|---|---|---|---|---|
1
Microsoft
MSFT
$3.64T
| $1.98B | 5.26% |
3,981,721
-145,482
| -4% | -$63.2M |
|
2
NVIDIA
NVDA
$5.36T
| $1.94B | 5.15% |
12,272,393
+74,755
| +0.6% | +$9.41M |
|
3
TSMC
TSM
$2.17T
| $1.5B | 3.98% |
6,622,255
-739,428
| -10% | -$137M |
|
4
Amazon
AMZN
$2.93T
| $1.18B | 3.14% |
5,400,353
-717,778
| -12% | -$142M |
|
5
Apple
AAPL
$4.52T
| $1.08B | 2.86% |
5,253,841
+14,443
| +0.3% | +$2.92M |
|
6
Meta Platforms (Facebook)
META
$1.5T
| $1.05B | 2.8% |
1,429,121
-143,109
| -9% | -$88.4M |
|
7
Broadcom
AVGO
$2.01T
| $816M | 2.16% |
2,959,172
-119,645
| -4% | -$26M |
|
8
Mastercard
MA
$500B
| $686M | 1.82% |
1,220,265
+4,951
| +0.4% | +$2.74M |
|
9
Mercado Libre
MELI
$97.1B
| $624M | 1.66% |
238,599
-16,968
| -7% | -$39.6M |
|
10
Sea Limited
SE
$70.2B
| $574M | 1.52% |
3,588,147
-89,864
| -2% | -$13M |
|
11
Carlyle Group
CG
$17.9B
| $511M | 1.36% |
9,949,455
-2,222,023
| -18% | -$95.7M |
|
12
TransUnion
TRU
$15.2B
| $417M | 1.11% |
4,739,103
+1,394,813
| +42% | +$116M |
|
13
Intuit
INTU
$88.9B
| $407M | 1.08% |
517,131
-58,484
| -10% | -$39.6M |
|
14
Costco
COST
$417B
| $373M | 0.99% |
376,485
+22,906
| +6% | +$22.8M |
|
15
Idexx Laboratories
IDXX
$46B
| $367M | 0.98% |
685,088
+47,977
| +8% | +$22.9M |
|
16
ServiceNow
NOW
$121B
| $360M | 0.96% |
1,752,845
-81,415
| -4% | -$15.4M |
|
17
Chipotle Mexican Grill
CMG
$43.5B
| $352M | 0.94% |
6,276,424
-525,921
| -8% | -$26.8M |
|
|
TLN
18
Talen Energy Corp
TLN
$15.9B
| $320M | 0.85% |
1,101,782
-11,211
| -1% | -$2.66M |
|
19
Doximity
DOCS
$3.9B
| $320M | 0.85% |
5,219,394
+634,927
| +14% | +$35.4M |
|
20
O'Reilly Automotive
ORLY
$76B
| $319M | 0.85% |
3,544,083
-338,427
| -9% | -$30.9M |
|
|
PRMB
21
Primo Brands
PRMB
$9.16B
| $314M | 0.83% |
10,602,683
-799,329
| -7% | -$25.6M |
|
22
Datadog
DDOG
$102B
| $292M | 0.77% |
2,171,076
+385,327
| +22% | +$42.7M |
|
23
Cameco
CCJ
$41.3B
| $287M | 0.76% |
3,869,291
+506,667
| +15% | +$27M |
|
24
Spotify
SPOT
$100B
| $285M | 0.76% |
371,786
-58,612
| -14% | -$37.6M |
|
|
P
25
Everpure Inc
P
$28.3B
| $284M | 0.75% |
4,926,836
+2,612,300
| +113% | +$130M |
|
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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.