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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
-0.1%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+788.31%
AUM
$30.3B
AUM Growth
-$5.59B
Cap. Flow
-$4.09B
Cap. Flow %
-13.52%
Top 10 Hldgs %
30.62%
Holding
459
New
46
Increased
157
Reduced
205
Closed
46

Top Buys

Rank Stock Value
1
AZN icon
AstraZeneca
AZN
+$370M
2
AKAM icon
Akamai
AKAM
+$162M
3
BWA icon
BorgWarner
BWA
+$152M
4
APH icon
Amphenol
APH
+$152M
5
SYNA icon
Synaptics
SYNA
+$129M

Top Sells

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$309M
2
SE icon
Sea Limited
SE
+$302M
3
AMZN icon
Amazon
AMZN
+$269M
4
MSFT icon
Microsoft
MSFT
+$248M
5
CIEN icon
Ciena
CIEN
+$214M

Sector Composition

Rank Sector Weight
1 Technology 36.13%
2 Healthcare 12.59%
3 Industrials 11.81%
4 Financials 11.55%
5 Consumer Discretionary 10.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
TNET icon
351
TriNet
TNET
$3.14B
$2.31M 0.01%
63,429
-339,444
-84% -$16.2M
ASML icon
352
ASML
ASML
$669B
$2.26M 0.01%
1,713
-1,733
-50% -$2.37M
VITL icon
353
Vital Farms
VITL
$525M
$1.7M 0.01%
120,471
-678,977
-85% -$16M
SMFG icon
354
Sumitomo Mitsui Financial
SMFG
$164B
$1.5M 0.01%
76,066
-48,378
-39% -$1.02M
ELF icon
355
e.l.f. Beauty
ELF
$5.81B
$1.43M ﹤0.01%
23,625
-4,212
-15% -$343K
BABA icon
356
Alibaba
BABA
$308B
$1.39M ﹤0.01%
11,067
– –
KO icon
357
Coca-Cola
KO
$375B
$1.38M ﹤0.01%
+18,120
New +$1.37M
STEL
358
DELISTED
Stellar Bancorp
STEL
$1.27M ﹤0.01%
34,788
-479,842
-93% -$17.2M
EFSC icon
359
Enterprise Financial Services Corp
EFSC
$2.39B
$1.24M ﹤0.01%
22,933
-223,096
-91% -$12.6M
CTVA icon
360
Corteva
CTVA
$51.3B
$1.2M ﹤0.01%
14,319
– –
IHG icon
361
InterContinental Hotels
IHG
$23.2B
$1.14M ﹤0.01%
8,522
-8,624
-50% -$1.19M
BBVA icon
362
Banco Bilbao Vizcaya Argentaria
BBVA
$156B
$952K ﹤0.01%
43,965
-51,357
-54% -$1.19M
RY icon
363
Royal Bank of Canada
RY
$293B
$935K ﹤0.01%
5,778
-5,839
-50% -$977K
ICE icon
364
Intercontinental Exchange
ICE
$84.4B
$912K ﹤0.01%
5,798
-27,748
-83% -$4.53M
EPI icon
365
WisdomTree India Earnings Fund ETF
EPI
$2.06B
$857K ﹤0.01%
21,000
– –
BCS icon
366
Barclays
BCS
$94.1B
$854K ﹤0.01%
40,378
-65,214
-62% -$1.59M
ACGL icon
367
Arch Capital
ACGL
$33.6B
$707K ﹤0.01%
7,363
-581,482
-99% -$55.7M
APO icon
368
Apollo Global Management
APO
$73.4B
$699K ﹤0.01%
6,275
-116
-2% -$14.4K
NTES icon
369
NetEase
NTES
$84.7B
$679K ﹤0.01%
6,065
-972
-14% -$121K
FLEX icon
370
Flex
FLEX
$44.8B
$555K ﹤0.01%
8,476
+214
+3% +$13.7K
ALSN icon
371
Allison Transmission
ALSN
$9.82B
$553K ﹤0.01%
4,726
+119
+3% +$13.5K
ESI icon
372
Element Solutions
ESI
$9.23B
$528K ﹤0.01%
+15,476
New +$485K
TKR icon
373
Timken Company
TKR
$9.03B
$521K ﹤0.01%
5,176
+130
+3% +$12.9K
IREN icon
374
Iris Energy
IREN
$14.7B
$511K ﹤0.01%
14,913
+2,162
+17% +$97.6K
NI icon
375
NiSource
NI
$20.4B
$496K ﹤0.01%
10,638
+270
+3% +$12.2K
13 14
15
16 17

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William Blair Investment Management's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair Investment Management held 459 positions worth $30.3B, down 16% from $35.9B the previous quarter. Its ten largest holdings account for 31% of the portfolio.

William Blair Investment Management withdrew a net $4.09B in Q1 2026, closing 46 positions and reducing 205 holdings. Its most notable exit was Sea Limited, an estimated $302M position sold in full.

By sector, the portfolio is most concentrated in Technology at 36% of assets, down from 38% a quarter earlier, followed by Healthcare and Industrials.

Against the trend, William Blair Investment Management opened a new position in Akamai worth $186M.

  • William Blair Investment Management's largest Q1 2026 buy was Akamai: 1,619,060 shares worth $186M.
  • William Blair Investment Management added most to AstraZeneca in Q1 2026, an estimated $370M increase.
  • William Blair Investment Management's biggest Q1 2026 reduction was NVIDIA, cutting an estimated $309M.
  • William Blair Investment Management fully exited Sea Limited in Q1 2026, selling an estimated $302M.
  • William Blair Investment Management's ten largest holdings make up 31% of its $30.3B portfolio in Q1 2026.
  • William Blair Investment Management opened 46 new positions and closed 46 in Q1 2026.
  • William Blair Investment Management's portfolio value fell 16% quarter-over-quarter to $30.3B.

Based on William Blair Investment Management's 13F filing for Q1 2026, filed 8 May 2026.