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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
-3.16%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
AUM
$34.9B
AUM Growth
-$2.36B
Cap. Flow
-$465K
Cap. Flow %
-0%
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97

Top Buys

Rank Stock Value
1
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$224M
2
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$113M
3
PWR icon
Quanta Services
PWR
+$75M
4
GLD icon
SPDR Gold Trust
GLD
+$58.9M
5
BA icon
Boeing
BA
+$55.5M

Top Sells

Rank Stock Value
1
WDAY icon
Workday
WDAY
+$91.2M
2
CWAN
Clearwater Analytics
CWAN
+$78M
3
APP icon
Applovin
APP
+$74.7M
4
TYL icon
Tyler Technologies
TYL
+$69.1M
5
UBER icon
Uber
UBER
+$62.2M

Sector Composition

Rank Sector Weight
1 Technology 21.79%
2 Industrials 14.2%
3 Financials 12.26%
4 Healthcare 10.59%
5 Consumer Discretionary 7.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
PAPR icon
351
Innovator US Equity Power Buffer ETF April
PAPR
$945M
$10M 0.03%
252,339
-6,905
-3% -$272K
TRGP icon
352
Targa Resources
TRGP
$56.8B
$10M 0.03%
39,927
-6,271
-14% -$1.36M
VBK icon
353
Vanguard Small-Cap Growth ETF
VBK
$22.7B
$9.95M 0.03%
32,927
-1,037
-3% -$326K
PFEB icon
354
Innovator US Equity Power Buffer ETF February
PFEB
$907M
$9.89M 0.03%
246,692
+38,024
+18% +$1.55M
LULU icon
355
lululemon athletica
LULU
$13.5B
$9.7M 0.03%
63,331
-4,425
-7% -$793K
GH icon
356
Guardant Health
GH
$19.1B
$9.57M 0.03%
+103,644
New +$10.4M
PHO icon
357
Invesco Water Resources ETF
PHO
$2.03B
$9.5M 0.03%
142,050
+5,573
+4% +$397K
ESGV icon
358
Vanguard ESG US Stock ETF
ESGV
$12.8B
$9.33M 0.03%
83,124
+2,966
+4% +$352K
SOXX icon
359
iShares Semiconductor ETF
SOXX
$38.4B
$9.33M 0.03%
28,374
+90
+0.3% +$30.7K
FROG icon
360
JFrog
FROG
$8.88B
$9.23M 0.03%
196,750
-27,624
-12% -$1.36M
SNEX icon
361
StoneX
SNEX
$8.72B
$9.22M 0.03%
171,507
+626
+0.4% +$31.7K
VLTO icon
362
Veralto
VLTO
$24.3B
$9.17M 0.03%
103,752
-11,653
-10% -$1.11M
ZM icon
363
Zoom
ZM
$27.1B
$9.13M 0.03%
113,514
-600
-0.5% -$50.3K
TT icon
364
Trane Technologies
TT
$98.8B
$9.12M 0.03%
21,876
+76
+0.3% +$32.3K
IRT icon
365
Independence Realty Trust
IRT
$3.98B
$9.11M 0.03%
611,770
-27,238
-4% -$447K
SN icon
366
SharkNinja
SN
$22.5B
$9.08M 0.03%
85,746
-20,465
-19% -$2.39M
COWZ icon
367
Pacer US Cash Cows 100 ETF
COWZ
$19B
$9.02M 0.03%
144,224
+4,725
+3% +$297K
BKNG icon
368
Booking.com
BKNG
$156B
$9M 0.03%
53,425
-8,275
-13% -$1.52M
HEFA icon
369
iShares Currency Hedged MSCI EAFE ETF
HEFA
$7.45B
$9M 0.03%
211,689
+12,426
+6% +$535K
ELF icon
370
e.l.f. Beauty
ELF
$4.77B
$8.99M 0.03%
148,341
+86,939
+142% +$7.07M
TTWO icon
371
Take-Two Interactive
TTWO
$46.1B
$8.98M 0.03%
45,491
+3,664
+9% +$797K
OMC icon
372
Omnicom Group
OMC
$23.5B
$8.9M 0.03%
118,199
-620
-0.5% -$48.1K
EFG icon
373
iShares MSCI EAFE Growth ETF
EFG
$16.2B
$8.9M 0.03%
79,893
-1,545
-2% -$182K
SMH icon
374
VanEck Semiconductor ETF
SMH
$60.8B
$8.79M 0.03%
22,924
-967
-4% -$384K
HBAN icon
375
Huntington Bancshares
HBAN
$34B
$8.76M 0.03%
559,571
+18,021
+3% +$308K
13 14
15
16 17

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William Blair & Company's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair & Company held 2,019 positions worth $34.9B, down 6.3% from $37.3B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q1 2026 filing shows 132 new, 799 increased, 746 reduced and 97 closed positions. Its largest new stake was Silicon Motion: 103,179 shares worth $11.6M. The largest sale was Workday, an estimated $91.2M.

By sector, the portfolio is most concentrated in Technology at 22% of assets, down from 26% a quarter earlier, followed by Industrials and Financials.

  • William Blair & Company's largest Q1 2026 buy was Silicon Motion: 103,179 shares worth $11.6M.
  • William Blair & Company added most to Invesco S&P 500 Equal Weight ETF in Q1 2026, an estimated $224M increase.
  • William Blair & Company's biggest Q1 2026 reduction was Workday, cutting an estimated $91.2M.
  • William Blair & Company fully exited Dynavax Technologies in Q1 2026, selling an estimated $27.4M.
  • William Blair & Company's ten largest holdings make up 26% of its $34.9B portfolio in Q1 2026.
  • William Blair & Company opened 132 new positions and closed 97 in Q1 2026.
  • William Blair & Company's portfolio value fell 6.3% quarter-over-quarter to $34.9B.

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