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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
MTG icon
301
MGIC Investment
MTG
$6.29B
$14.6M 0.04%
515,948
-413,949
-45% -$11.3M
DSGX icon
302
Descartes Systems
DSGX
$6.65B
$14.3M 0.04%
151,523
+585
+0.4% +$59.8K
ASR icon
303
Grupo Aeroportuario del Sureste
ASR
$8.24B
$13.9M 0.04%
42,912
-1,616
-4% -$520K
WGO icon
304
Winnebago Industries
WGO
$915M
$13.8M 0.04%
413,082
-24,906
-6% -$822K
PRCT icon
305
Procept Biorobotics
PRCT
$1.22B
$13.7M 0.04%
383,017
+54,396
+17% +$2.48M
AAMI
306
Acadian Asset Management
AAMI
$3.27B
$13.5M 0.04%
281,318
-430,764
-60% -$19.2M
TITN icon
307
Titan Machinery
TITN
$431M
$12.9M 0.03%
770,035
-46,694
-6% -$916K
MRX
308
Marex Group Limited Ordinary Shares
MRX
$5.12B
$12.4M 0.03%
368,449
-442,342
-55% -$16M
INVX
309
Innovex International
INVX
$2.13B
$12.3M 0.03%
662,449
-533,049
-45% -$8.87M
CRH icon
310
CRH
CRH
$65.2B
$12.1M 0.03%
100,718
-60,908
-38% -$6.43M
MNRO icon
311
Monro
MNRO
$359M
$12M 0.03%
669,478
-324,400
-33% -$5.32M
CBRL icon
312
Cracker Barrel
CBRL
$1.31B
$11.8M 0.03%
268,281
-236,076
-47% -$13.6M
LLY icon
313
Eli Lilly
LLY
$1.09T
$11.7M 0.03%
15,375
-5,192
-25% -$3.86M
IWO icon
314
iShares Russell 2000 Growth ETF
IWO
$15B
$11.6M 0.03%
36,160
-10,321
-22% -$3.11M
LOCO icon
315
El Pollo Loco
LOCO
$463M
$11.4M 0.03%
1,171,235
-71,328
-6% -$748K
CGNT icon
316
Cognyte Software
CGNT
$675M
$11.3M 0.03%
1,343,872
-81,416
-6% -$721K
COR icon
317
Cencora
COR
$60B
$10.9M 0.03%
34,905
-2,760
-7% -$812K
WST icon
318
West Pharmaceutical
WST
$24.8B
$10.7M 0.03%
40,805
-325,347
-89% -$79.1M
HUM icon
319
Humana
HUM
$46.7B
$10M 0.03%
38,495
+27,684
+256% +$7.28M
ISRG icon
320
Intuitive Surgical
ISRG
$142B
$9.87M 0.03%
22,072
-13,703
-38% -$6.58M
JPM icon
321
JPMorgan Chase
JPM
$971B
$9.5M 0.02%
30,103
-44,855
-60% -$13.3M
GDEN
322
DELISTED
Golden Entertainment
GDEN
$9.33M 0.02%
395,547
-155,126
-28% -$4.13M
AMAT icon
323
Applied Materials
AMAT
$435B
$9.11M 0.02%
44,500
-1,438
-3% -$261K
CLBT icon
324
Cellebrite
CLBT
$3.8B
$8.95M 0.02%
482,817
-69,729
-13% -$1.1M
BVN icon
325
Compañía de Minas Buenaventura
BVN
$8.79B
$8.51M 0.02%
+349,743
New +$6.56M
11 12
13
14 15

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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.