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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
+10.81%
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
$38.7B
AUM Growth
+$994M
(+2.6%)
Cap. Flow
-$1.59B
Cap. Flow
% of AUM
-4.12%
Top 10 Holdings %
Top 10 Hldgs %
31.01%
Holding
462
New
45
Increased
110
Reduced
257
Closed
48
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$445M |
| 2 |
Nu Holdings
NU
|
+$175M |
| 3 |
Bentley Systems
BSY
|
+$161M |
| 4 |
CAVA Group
CAVA
|
+$143M |
| 5 |
Snowflake
SNOW
|
+$111M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Datadog
DDOG
|
+$298M |
| 2 |
Amazon
AMZN
|
+$222M |
| 3 |
Meta Platforms (Facebook)
META
|
+$181M |
| 4 |
TLN
Talen Energy Corp
TLN
|
+$152M |
| 5 |
EPAM Systems
EPAM
|
+$149M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 38.52% |
| 2 | Consumer Discretionary | 12.99% |
| 3 | Financials | 12.96% |
| 4 | Healthcare | 10.56% |
| 5 | Industrials | 9.02% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
451
US Foods
USFD
$24B
| – | – |
-4,114
| Closed | -$317K |
|
452
Vista Energy
VIST
$7.31B
| – | – |
-627,389
| Closed | -$30M |
|
453
Vital Farms
VITL
$495M
| – | – |
-807,968
| Closed | -$31.1M |
|
|
WCN
454
Waste Connections
WCN
$41.6B
| – | – |
-339,466
| Closed | -$63.4M |
|
455
Workday
WDAY
$43.3B
| – | – |
-27,544
| Closed | -$6.61M |
|
456
Werner Enterprises
WERN
$2.27B
| – | – |
-525,976
| Closed | -$14.4M |
|
|
WNS
457
DELISTED
WNS Holdings
WNS
| – | – |
-803,915
| Closed | -$50.8M |
|
458
Watsco Inc
WSO
$12.8B
| – | – |
-13,202
| Closed | -$5.83M |
|
459
YPF Sociedad Anonima American Depositary Shares (Each representing ten (10) Class D shares of Capital Stock)
YPF
$19.2B
| – | – |
-907,929
| Closed | -$28.6M |
|
460
Yum China
YUMC
$16.4B
| – | – |
-569,715
| Closed | -$25.5M |
|
461
Zoetis
ZTS
$30.4B
| – | – |
-12,501
| Closed | -$1.95M |
|
|
AHL
462
DELISTED
Aspen Insurance
AHL
| – | – |
-523,682
| Closed | -$16.5M |
|
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William Blair Investment Management's Q3 2025 Portfolio in Review
As of Q3 2025, William Blair Investment Management held 462 positions worth $38.7B, up 2.6% from $37.7B the previous quarter. Its ten largest holdings account for 31% of the portfolio.
William Blair Investment Management withdrew a net $1.59B in Q3 2025, closing 48 positions and reducing 257 holdings. Its most notable exit was EPAM Systems, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 39% of assets, up from 36% a quarter earlier, followed by Consumer Discretionary and Financials.
Against the trend, William Blair Investment Management opened a new position in Bentley Systems worth $151M.
- William Blair Investment Management's largest Q3 2025 buy was Bentley Systems: 2,931,296 shares worth $151M.
- William Blair Investment Management added most to Alphabet (Google) Class A in Q3 2025, an estimated $445M increase.
- William Blair Investment Management's biggest Q3 2025 reduction was Datadog, cutting an estimated $298M.
- William Blair Investment Management fully exited EPAM Systems in Q3 2025, selling an estimated $149M.
- William Blair Investment Management's ten largest holdings make up 31% of its $38.7B portfolio in Q3 2025.
- William Blair Investment Management opened 45 new positions and closed 48 in Q3 2025.
- William Blair Investment Management's portfolio value rose 2.6% quarter-over-quarter to $38.7B.
Based on William Blair Investment Management's 13F filing for Q3 2025, filed 12 Nov 2025.