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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
CGW icon
1501
Invesco S&P Global Water Index ETF
CGW
$1.05B
$188K ﹤0.01%
2,944
+3
+0.1% +$197
LYFT icon
1502
Lyft
LYFT
$6.01B
$186K ﹤0.01%
13,950
-1,585
-10% -$24.5K
DOC icon
1503
Healthpeak Properties
DOC
$15.6B
$183K ﹤0.01%
11,141
-2,707
-20% -$46.4K
IGIB icon
1504
iShares 5-10 Year Investment Grade Corporate Bond ETF
IGIB
$18.5B
$183K ﹤0.01%
3,435
+994
+41% +$53.5K
PDSB icon
1505
PDS Biotechnology
PDSB
$37.5M
$182K ﹤0.01%
300,000
+50,000
+20% +$37.6K
RGT
1506
Royce Global Value Trust
RGT
$97.3M
$181K ﹤0.01%
13,520
– –
SUSC icon
1507
iShares ESG Aware USD Corporate Bond ETF
SUSC
$1.29B
$175K ﹤0.01%
7,547
-313
-4% -$7.32K
GPN icon
1508
Global Payments
GPN
$24.1B
$174K ﹤0.01%
+2,584
New +$191K
VOX icon
1509
Vanguard Communication Services ETF
VOX
$5.73B
$173K ﹤0.01%
960
-618
-39% -$117K
TFI icon
1510
State Street SPDR Nuveen ICE Municipal Bond ETF
TFI
$3.06B
$172K ﹤0.01%
3,804
-400
-10% -$18.4K
PXF icon
1511
Invesco FTSE RAFI Developed Markets ex-US ETF
PXF
$2.85B
$170K ﹤0.01%
2,430
+2
+0.1% +$141
VRP icon
1512
Invesco Variable Rate Preferred ETF
VRP
$2.98B
$168K ﹤0.01%
6,992
+6
+0.1% +$146
NRGV icon
1513
Energy Vault
NRGV
$471M
$167K ﹤0.01%
50,700
– –
CLOV icon
1514
Clover Health Investments
CLOV
$2.24B
$167K ﹤0.01%
94,793
+15,293
+19% +$33.2K
UPWK icon
1515
Upwork
UPWK
$1.17B
$165K ﹤0.01%
15,025
+4,995
+50% +$78.7K
CMPX icon
1516
Compass Therapeutics
CMPX
$364M
$163K ﹤0.01%
+30,760
New +$178K
WU icon
1517
Western Union
WU
$2.54B
$163K ﹤0.01%
18,626
-6,814
-27% -$64.5K
NXE icon
1518
NexGen Energy
NXE
$5.99B
$161K ﹤0.01%
13,921
– –
LMBS icon
1519
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
$6.35B
$159K ﹤0.01%
3,200
-191
-6% -$9.58K
VGLT icon
1520
Vanguard Long-Term Treasury ETF
VGLT
$10.2B
$158K ﹤0.01%
2,855
+2,521
+755% +$142K
ARDX icon
1521
Ardelyx
ARDX
$1.25B
$158K ﹤0.01%
26,346
+1,839
+8% +$12.2K
RUN icon
1522
Sunrun
RUN
$2.32B
$157K ﹤0.01%
+11,601
New +$193K
MKC.V icon
1523
McCormick & Company Voting
MKC.V
$14B
$157K ﹤0.01%
3,121
– –
RSPF icon
1524
Invesco S&P 500 Equal Weight Financials ETF
RSPF
$309M
$157K ﹤0.01%
2,200
– –
IYT icon
1525
iShares US Transportation ETF
IYT
$2.29B
$156K ﹤0.01%
2,097
+2,065
+6,453% +$161K
59 60
61
62 63

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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.