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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
ICE icon
326
Intercontinental Exchange
ICE
$85.7B
$8.18M 0.02%
48,528
-47,282
-49% -$8.45M
MUSA icon
327
Murphy USA
MUSA
$10.2B
$7.2M 0.02%
18,550
-21,042
-53% -$8.33M
NFLX icon
328
Netflix
NFLX
$319B
$7.19M 0.02%
59,970
-38,390
-39% -$4.69M
QTRX icon
329
Quanterix
QTRX
$144M
$7.14M 0.02%
1,315,280
+187,299
+17% +$996K
ATAT icon
330
Atour Lifestyle Holdings
ATAT
$4.51B
$7.12M 0.02%
+189,481
New +$6.92M
PGR icon
331
Progressive
PGR
$121B
$7.09M 0.02%
28,699
-25,490
-47% -$6.28M
GGG icon
332
Graco
GGG
$13.1B
$6.71M 0.02%
78,940
-43,042
-35% -$3.68M
TKO icon
333
TKO Group
TKO
$14.3B
$6.7M 0.02%
33,196
-21,345
-39% -$3.9M
ABT icon
334
Abbott
ABT
$192B
$6.27M 0.02%
46,827
-457
-1% -$60K
TIGO icon
335
Millicom
TIGO
$16B
$6.23M 0.02%
128,350
+16,695
+15% +$733K
ODD icon
336
ODDITY Tech
ODD
$603M
$5.4M 0.01%
86,745
-55,803
-39% -$3.62M
HIMS icon
337
Hims & Hers Health
HIMS
$6.85B
$4.54M 0.01%
80,035
-142,452
-64% -$7.3M
AJG icon
338
Arthur J. Gallagher & Co
AJG
$64.5B
$4.18M 0.01%
13,511
-19,874
-60% -$5.99M
ELF icon
339
e.l.f. Beauty
ELF
$5.41B
$3.8M 0.01%
28,695
-173,230
-86% -$21.4M
TIGR
340
UP Fintech Holding
TIGR
$813M
$3.79M 0.01%
+355,392
New +$3.81M
ASHR icon
341
Xtrackers Harvest CSI 300 China A-Shares ETF
ASHR
$1.59B
$3.35M 0.01%
101,579
– –
BBVA icon
342
Banco Bilbao Vizcaya Argentaria
BBVA
$158B
$3.31M 0.01%
171,824
+14,362
+9% +$251K
ASML icon
343
ASML
ASML
$714B
$3.1M 0.01%
3,207
-8
-0.2% -$6.29K
KNSL icon
344
Kinsale Capital Group
KNSL
$8.49B
$3.04M 0.01%
7,144
-9,517
-57% -$4.31M
UL icon
345
Unilever
UL
$134B
$2.68M 0.01%
40,196
-74
-0.2% -$5.11K
SAP icon
346
SAP
SAP
$233B
$2.54M 0.01%
9,515
-3,006
-24% -$845K
AZN icon
347
AstraZeneca
AZN
$245B
$2.52M 0.01%
16,406
-33
-0.2% -$5K
SMFG icon
348
Sumitomo Mitsui Financial
SMFG
$167B
$2.19M 0.01%
131,093
-133
-0.1% -$2.13K
KEYS icon
349
Keysight
KEYS
$61.1B
$2.13M 0.01%
12,157
+129
+1% +$21.5K
INDA icon
350
iShares MSCI India ETF
INDA
$6.58B
$1.95M 0.01%
37,400
-5,800
-13% -$310K
12 13
14
15 16

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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.