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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
CF icon
701
CF Industries
CF
$19.6B
$2.23M 0.01%
17,181
-347
-2% -$35.4K
STZ icon
702
Constellation Brands
STZ
$22.5B
$2.23M 0.01%
14,856
+3,685
+33% +$569K
BXSL icon
703
Blackstone Secured Lending
BXSL
$5.36B
$2.22M 0.01%
93,814
+2,544
+3% +$63.4K
MPLX icon
704
MPLX
MPLX
$58.6B
$2.22M 0.01%
38,911
+1,767
+5% +$100K
AEM icon
705
Agnico Eagle Mines
AEM
$72.2B
$2.21M 0.01%
10,912
-3,881
-26% -$808K
VSEC icon
706
VSE Corp
VSEC
$5.19B
$2.2M 0.01%
11,936
+2,276
+24% +$463K
CWB icon
707
State Street SPDR Bloomberg Convertible Securities ETF
CWB
$5.41B
$2.2M 0.01%
24,004
-25,548
-52% -$2.39M
BOOT icon
708
Boot Barn
BOOT
$4.58B
$2.2M 0.01%
14,999
+11,462
+324% +$2.08M
KJUL icon
709
Innovator US Small Cap Power Buffer ETF July
KJUL
$206M
$2.19M 0.01%
68,387
-450
-0.7% -$14.5K
GBCI icon
710
Glacier Bancorp
GBCI
$6.36B
$2.19M 0.01%
49,022
+23,847
+95% +$1.13M
U icon
711
Unity
U
$14B
$2.18M 0.01%
99,493
-37,873
-28% -$1.05M
FLS icon
712
Flowserve
FLS
$8.94B
$2.18M 0.01%
29,594
-1,358
-4% -$108K
MTUM icon
713
iShares MSCI USA Momentum Factor ETF
MTUM
$23.6B
$2.17M 0.01%
9,024
+493
+6% +$124K
HEI.A icon
714
HEICO Corp Class A
HEI.A
$36B
$2.16M 0.01%
10,239
+27
+0.3% +$6.65K
ADSK icon
715
Autodesk
ADSK
$51.8B
$2.16M 0.01%
9,013
-3,937
-30% -$990K
FRPT icon
716
Freshpet
FRPT
$3.04B
$2.15M 0.01%
36,464
+544
+2% +$38.2K
GM icon
717
General Motors
GM
$80.9B
$2.15M 0.01%
28,820
+1,481
+5% +$118K
REGL icon
718
ProShares S&P MidCap 400 Dividend Aristocrats ETF
REGL
$1.77B
$2.14M 0.01%
24,769
+16,498
+199% +$1.47M
AMPX icon
719
Amprius Technologies
AMPX
$1.2B
$2.13M 0.01%
126,622
+86,470
+215% +$1.13M
UEC icon
720
Uranium Energy
UEC
$4.47B
$2.12M 0.01%
157,390
+240
+0.2% +$3.7K
EBAY icon
721
eBay
EBAY
$51.2B
$2.12M 0.01%
23,248
+1,779
+8% +$160K
FXE icon
722
Invesco CurrencyShares Euro Currency Trust
FXE
$344M
$2.11M 0.01%
19,781
+8,226
+71% +$888K
DSGX icon
723
Descartes Systems
DSGX
$6.68B
$2.1M 0.01%
29,360
-188,307
-87% -$13.9M
SNY icon
724
Sanofi
SNY
$107B
$2.1M 0.01%
43,593
+39,212
+895% +$1.83M
TOL icon
725
Toll Brothers
TOL
$14B
$2.1M 0.01%
15,357
+2,382
+18% +$350K
27 28
29
30 31

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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.