We are live on ! Find out more
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
ADM icon
476
Archer Daniels Midland
ADM
$38.7B
$5.75M 0.02%
79,108
-3,774
-5% -$255K
MRCY icon
477
Mercury Systems
MRCY
$5.41B
$5.74M 0.02%
78,791
-4,981
-6% -$434K
VT icon
478
Vanguard Total World Stock ETF
VT
$75.3B
$5.7M 0.02%
41,191
+94
+0.2% +$13.5K
GBTC icon
479
Grayscale Bitcoin Trust
GBTC
$9.54B
$5.65M 0.02%
107,079
-250
-0.2% -$14.9K
BP icon
480
BP
BP
$112B
$5.64M 0.02%
120,032
-108,616
-48% -$4.26M
QUAL icon
481
iShares MSCI USA Quality Factor ETF
QUAL
$45.7B
$5.61M 0.02%
29,232
+623
+2% +$125K
SHEL icon
482
Shell
SHEL
$244B
$5.6M 0.02%
60,233
-1,098
-2% -$88.7K
PHM icon
483
Pultegroup
PHM
$25.2B
$5.55M 0.02%
47,220
+9,419
+25% +$1.21M
CP icon
484
Canadian Pacific Kansas City
CP
$81B
$5.54M 0.02%
70,406
+3,878
+6% +$306K
CSX icon
485
CSX Corp
CSX
$94B
$5.53M 0.02%
134,788
-4,435
-3% -$174K
IXUS icon
486
iShares Core MSCI Total International Stock ETF
IXUS
$56.8B
$5.52M 0.02%
63,758
+40,720
+177% +$3.63M
FNDX icon
487
Schwab Fundamental US Large Company Index ETF
FNDX
$26.5B
$5.51M 0.02%
198,002
+26,487
+15% +$751K
CARR icon
488
Carrier Global
CARR
$49.8B
$5.41M 0.02%
96,003
-9,669
-9% -$572K
AMP icon
489
Ameriprise Financial
AMP
$47.8B
$5.38M 0.02%
12,112
-496
-4% -$239K
SPOT icon
490
Spotify
SPOT
$108B
$5.38M 0.02%
11,087
-33,858
-75% -$17M
MET icon
491
MetLife
MET
$62.4B
$5.35M 0.02%
75,718
-5,390
-7% -$404K
IYW icon
492
iShares US Technology ETF
IYW
$22.6B
$5.33M 0.02%
29,377
-923
-3% -$178K
WEC icon
493
WEC Energy
WEC
$36.3B
$5.27M 0.02%
45,512
+4,050
+10% +$455K
DHI icon
494
D.R. Horton
DHI
$41.2B
$5.26M 0.02%
38,317
-1,139
-3% -$172K
KDEC
495
Innovator U.S. Small Cap Power Buffer ETF - December
KDEC
$72.1M
$5.25M 0.02%
204,482
-600
-0.3% -$15.7K
CASY icon
496
Casey's General Stores
CASY
$32.1B
$5.23M 0.02%
7,182
+192
+3% +$125K
URI icon
497
United Rentals
URI
$65.7B
$5.22M 0.02%
7,168
-164
-2% -$138K
VONV icon
498
Vanguard Russell 1000 Value ETF
VONV
$20.5B
$5.2M 0.01%
55,488
+7,190
+15% +$691K
AIR icon
499
AAR Corp
AIR
$5.4B
$5.2M 0.01%
47,475
-12,100
-20% -$1.3M
LPLA icon
500
LPL Financial
LPLA
$27B
$5.17M 0.01%
17,170
+11,593
+208% +$3.89M
18 19
20
21 22

Similar funds

SAM
Storebrand Asset Management Lysaker, Norway $34.8B AUM 25.49% 1-Year Est. Return
Daiwa Securities Group
Daiwa Securities Group Tokyo, Japan $34.8B AUM 20.7% 1-Year Est. Return
Chevy Chase Trust
Chevy Chase Trust Bethesda, Maryland $34.7B AUM 29.45% 1-Year Est. Return
VIA
Vanguard Investments Australia Victoria, Australia $34.6B AUM
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return
Pacer Advisors
Pacer Advisors Malvern, Pennsylvania $35.6B AUM 18.19% 1-Year Est. Return
Kayne Anderson Rudnick Investment Management
Kayne Anderson Rudnick Investment Management Los Angeles, California $34B AUM 6.31% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return

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.