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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
DG icon
901
Dollar General
DG
$28.4B
$1.14M ﹤0.01%
9,591
+3,689
+63% +$526K
FLEX icon
902
Flex
FLEX
$37.7B
$1.13M ﹤0.01%
17,265
-5,700
-25% -$365K
EXPD icon
903
Expeditors International
EXPD
$22.3B
$1.13M ﹤0.01%
7,885
+118
+2% +$17.9K
FIG
904
Figma
FIG
$13.1B
$1.13M ﹤0.01%
53,408
+11,300
+27% +$310K
PPG icon
905
PPG Industries
PPG
$24.9B
$1.13M ﹤0.01%
10,527
+291
+3% +$33K
HIG icon
906
Hartford Financial Services
HIG
$39.9B
$1.12M ﹤0.01%
8,311
-1,110
-12% -$152K
WPC icon
907
W.P. Carey
WPC
$17B
$1.12M ﹤0.01%
16,462
+354
+2% +$24.8K
EQR icon
908
Equity Residential
EQR
$25.8B
$1.12M ﹤0.01%
18,890
+6,350
+51% +$392K
DBEF icon
909
Xtrackers MSCI EAFE Hedged Equity ETF
DBEF
$9.1B
$1.12M ﹤0.01%
22,603
+1,226
+6% +$61.4K
PDBC icon
910
Invesco Actively Managed Exch-Traded Commodity Fd Tr Invesco Optimum Yield Diversified Commodity Strategy No K-1 ETF
PDBC
$6.38B
$1.11M ﹤0.01%
64,193
+329
+0.5% +$4.97K
ARKK icon
911
ARK Innovation ETF
ARKK
$5.59B
$1.11M ﹤0.01%
16,443
-2,171
-12% -$161K
BLDR icon
912
Builders FirstSource
BLDR
$7.29B
$1.11M ﹤0.01%
+13,450
New +$1.44M
PAR icon
913
PAR Technology
PAR
$716M
$1.11M ﹤0.01%
83,029
-1,394
-2% -$32.7K
IR icon
914
Ingersoll Rand
IR
$33.1B
$1.09M ﹤0.01%
13,621
+481
+4% +$42.5K
ALC icon
915
Alcon
ALC
$34B
$1.09M ﹤0.01%
14,483
-157
-1% -$12.5K
MGTX icon
916
MeiraGTx Holdings
MGTX
$1.08B
$1.09M ﹤0.01%
125,422
+22
+0% +$167
VICI icon
917
VICI Properties
VICI
$29.9B
$1.08M ﹤0.01%
39,647
-53,787
-58% -$1.54M
HASI icon
918
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.81B
$1.08M ﹤0.01%
29,404
+1,257
+4% +$44.7K
SUSB icon
919
iShares ESG Aware 1-5 Year USD Corporate Bond ETF
SUSB
$1.3B
$1.07M ﹤0.01%
42,885
-24
-0.1% -$605
NACP icon
920
Impact Shares NAACP Minority Empowerment ETF
NACP
$71.3M
$1.07M ﹤0.01%
22,159
+4,521
+26% +$228K
FIX icon
921
Comfort Systems
FIX
$53.5B
$1.07M ﹤0.01%
775
+98
+14% +$124K
MOO icon
922
VanEck Agribusiness ETF
MOO
$992M
$1.07M ﹤0.01%
12,618
-40
-0.3% -$3.26K
ERIE icon
923
Erie Indemnity
ERIE
$13B
$1.06M ﹤0.01%
4,233
-142
-3% -$38.1K
CSW
924
CSW Industrials
CSW
$4.44B
$1.06M ﹤0.01%
3,500
+2,405
+220% +$699K
SFM icon
925
Sprouts Farmers Market
SFM
$7.44B
$1.06M ﹤0.01%
13,732
+1,333
+11% +$99.5K
35 36
37
38 39

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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.