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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
+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
Cap. Flow
-$1.59B
Cap. Flow %
-4.12%
Top 10 Hldgs %
31.01%
Holding
462
New
45
Increased
110
Reduced
257
Closed
48

Top Buys

Rank Stock Value
1
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$445M
2
NU icon
Nu Holdings
NU
+$175M
3
BSY icon
Bentley Systems
BSY
+$161M
4
CAVA icon
CAVA Group
CAVA
+$143M
5
SNOW icon
Snowflake
SNOW
+$111M

Top Sells

Rank Stock Value
1
DDOG icon
Datadog
DDOG
+$298M
2
AMZN icon
Amazon
AMZN
+$222M
3
META icon
Meta Platforms (Facebook)
META
+$181M
4
TLN
Talen Energy Corp
TLN
+$152M
5
EPAM icon
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
TCOM icon
351
Trip.com Group
TCOM
$28.7B
$1.75M ﹤0.01%
23,287
-68
-0.3% -$4.54K
SHOP icon
352
Shopify
SHOP
$194B
$1.69M ﹤0.01%
11,340
-12
-0.1% -$1.63K
MRVL icon
353
Marvell Technology
MRVL
$195B
$1.57M ﹤0.01%
18,674
+3,271
+21% +$241K
BCS icon
354
Barclays
BCS
$94.4B
$1.56M ﹤0.01%
+75,493
New +$1.49M
MSI icon
355
Motorola Solutions
MSI
$77.7B
$1.33M ﹤0.01%
+2,905
New +$1.31M
CTVA icon
356
Corteva
CTVA
$50.4B
$1.12M ﹤0.01%
16,553
-4,699
-22% -$341K
RELX icon
357
RELX
RELX
$60.2B
$1.02M ﹤0.01%
21,310
-14,151
-40% -$700K
SMIN icon
358
iShares MSCI India Small-Cap ETF
SMIN
$771M
$939K ﹤0.01%
13,092
-1,350
-9% -$100K
EPI icon
359
WisdomTree India Earnings Fund ETF
EPI
$2.04B
$928K ﹤0.01%
21,000
– –
APO icon
360
Apollo Global Management
APO
$81.9B
$879K ﹤0.01%
6,597
-919,898
-99% -$130M
CBZ icon
361
CBIZ
CBZ
$2.96B
$808K ﹤0.01%
15,257
-287,889
-95% -$18.6M
ALLE icon
362
Allegion
ALLE
$14.1B
$608K ﹤0.01%
3,428
-114
-3% -$18.8K
DDOG icon
363
Datadog
DDOG
$86.5B
$582K ﹤0.01%
4,084
-2,166,992
-100% -$298M
RGLD icon
364
Royal Gold
RGLD
$19.7B
$560K ﹤0.01%
2,791
+242
+9% +$41.9K
DCI icon
365
Donaldson
DCI
$11.2B
$531K ﹤0.01%
6,485
-213
-3% -$16.1K
FLEX icon
366
Flex
FLEX
$46B
$515K ﹤0.01%
8,884
-1,576
-15% -$83.7K
PPL
367
PPL Corp
PPL
$26.7B
$497K ﹤0.01%
13,371
-418
-3% -$15K
WEX icon
368
WEX
WEX
$6.48B
$491K ﹤0.01%
3,117
-105
-3% -$17.4K
NI icon
369
NiSource
NI
$20.1B
$489K ﹤0.01%
11,297
-373
-3% -$15.4K
REG icon
370
Regency Centers
REG
$13.9B
$479K ﹤0.01%
6,575
-198
-3% -$14.1K
DOX icon
371
Amdocs
DOX
$6.08B
$450K ﹤0.01%
5,482
-168
-3% -$14.6K
DOV icon
372
Dover
DOV
$28B
$439K ﹤0.01%
+2,631
New +$472K
ALSN icon
373
Allison Transmission
ALSN
$10.2B
$424K ﹤0.01%
4,990
-172
-3% -$15.3K
G icon
374
Genpact
G
$5.7B
$421K ﹤0.01%
10,056
-337
-3% -$14.8K
DOC icon
375
Healthpeak Properties
DOC
$14.2B
$419K ﹤0.01%
21,885
-716
-3% -$12.8K
13 14
15
16 17

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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.