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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
+771.69%
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
GGG icon
326
Graco
GGG
$13B
$6.26M 0.02%
73,893
+19,387
+36% +$1.72M
GEF icon
327
Greif
GEF
$4.56B
$6.22M 0.02%
92,705
-192,377
-67% -$13.6M
PGR icon
328
Progressive
PGR
$125B
$6.11M 0.02%
30,797
-192
-0.6% -$39.6K
JPM icon
329
JPMorgan Chase
JPM
$947B
$6.05M 0.02%
20,562
-147
-0.7% -$44.6K
HUM icon
330
Humana
HUM
$45.8B
$6M 0.02%
34,577
-9,300
-21% -$1.91M
VRRM icon
331
Verra Mobility
VRRM
$636M
$5.55M 0.02%
388,617
-3,050,331
-89% -$55.9M
CRM icon
332
Salesforce
CRM
$142B
$5.41M 0.02%
28,986
+39
+0.1% +$8.08K
TJX icon
333
TJX Companies
TJX
$173B
$5.4M 0.02%
+33,796
New +$5.26M
BX icon
334
Blackstone
BX
$106B
$5.39M 0.02%
46,877
+63
+0.1% +$8.2K
TBBB icon
335
BBB Foods
TBBB
$4.9B
$5.21M 0.02%
147,358
-595,291
-80% -$20.8M
NFLX icon
336
Netflix
NFLX
$293B
$5.12M 0.02%
53,276
+12,010
+29% +$1.06M
CRH icon
337
CRH
CRH
$68.7B
$5.06M 0.02%
48,117
-21,934
-31% -$2.58M
TKO icon
338
TKO Group
TKO
$13.7B
$4.57M 0.02%
22,676
-163
-0.7% -$33.3K
CAAP icon
339
Corporacion America
CAAP
$4.28B
$4.48M 0.01%
+176,983
New +$4.81M
FIGR
340
Figure Technology Solutions
FIGR
$6.37B
$4.08M 0.01%
120,255
+14,022
+13% +$604K
V icon
341
Visa
V
$689B
$4.06M 0.01%
13,418
+18
+0.1% +$5.79K
KEYS icon
342
Keysight
KEYS
$53.6B
$3.97M 0.01%
14,048
-9,639
-41% -$2.41M
ABT icon
343
Abbott
ABT
$182B
$3.96M 0.01%
38,613
-6,522
-14% -$736K
BSX icon
344
Boston Scientific
BSX
$67.6B
$3.24M 0.01%
51,609
+70
+0.1% +$5.6K
ASHR icon
345
Xtrackers Harvest CSI 300 China A-Shares ETF
ASHR
$1.57B
$2.8M 0.01%
85,779
-4,258
-5% -$143K
INDA icon
346
iShares MSCI India ETF
INDA
$6.77B
$2.59M 0.01%
55,400
+13,500
+32% +$692K
VNET
347
VNET Group
VNET
$2.04B
$2.59M 0.01%
308,997
-571,198
-65% -$6.05M
KFY icon
348
Korn Ferry
KFY
$4.13B
$2.51M 0.01%
39,865
-374,600
-90% -$24.2M
UBER icon
349
Uber
UBER
$139B
$2.41M 0.01%
33,464
-21,071
-39% -$1.62M
AEM icon
350
Agnico Eagle Mines
AEM
$73B
$2.34M 0.01%
+11,512
New +$2.4M
12 13
14
15 16

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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.