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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
EMGF icon
1576
iShares Emerging Markets Equity Factor ETF
EMGF
$1.77B
$113K ﹤0.01%
1,866
+1,592
+581% +$99.3K
SPTL icon
1577
State Street SPDR Portfolio Long Term Treasury ETF
SPTL
$10.6B
$111K ﹤0.01%
4,217
-2,246
-35% -$59.8K
NULV icon
1578
Nuveen ESG Large-Cap Value ETF
NULV
$2.18B
$110K ﹤0.01%
2,428
– –
COMT icon
1579
iShares GSCI Commodity Dynamic Roll Strategy ETF
COMT
$1.19B
$110K ﹤0.01%
3,259
– –
RPAY icon
1580
Repay Holdings
RPAY
$338M
$108K ﹤0.01%
41,691
+647
+2% +$2.07K
NEPH icon
1581
Nephros
NEPH
$35.7M
$108K ﹤0.01%
36,249
– –
OPPE
1582
WisdomTree European Opportunities Fund
OPPE
$286M
$107K ﹤0.01%
2,000
– –
VERU icon
1583
Veru
VERU
$35.8M
$106K ﹤0.01%
48,000
– –
DBEU icon
1584
Xtrackers MSCI Europe Hedged Equity ETF
DBEU
$768M
$102K ﹤0.01%
2,091
– –
BOND icon
1585
PIMCO Active Bond Exchange-Traded Fund
BOND
$8.41B
$102K ﹤0.01%
1,101
+216
+24% +$20.2K
PID icon
1586
Invesco International Dividend Achievers ETF
PID
$938M
$101K ﹤0.01%
4,560
– –
LPL icon
1587
LG Display
LPL
$2.83B
$99.5K ﹤0.01%
25,655
+9,751
+61% +$41.2K
KELYA icon
1588
Kelly Services Class A
KELYA
$561M
$98.4K ﹤0.01%
11,115
+112
+1% +$1.07K
SCHH icon
1589
Schwab US REIT ETF
SCHH
$11.7B
$98K ﹤0.01%
4,558
-1,251
-22% -$27.4K
FXL icon
1590
First Trust Technology AlphaDEX Fund
FXL
$2.45B
$97.7K ﹤0.01%
615
– –
MFG icon
1591
Mizuho Financial
MFG
$121B
$97K ﹤0.01%
+12,215
New +$103K
UPRO icon
1592
ProShares UltraPro S&P 500
UPRO
$5.07B
$97K ﹤0.01%
1,000
-200
-17% -$22.6K
XHB icon
1593
State Street SPDR S&P Homebuilders ETF
XHB
$1.64B
$96.9K ﹤0.01%
982
+300
+44% +$32.9K
PFFD icon
1594
Global X US Preferred ETF
PFFD
$2.14B
$96.6K ﹤0.01%
5,250
+2,519
+92% +$48.2K
QFLR icon
1595
Innovator Nasdaq-100 Managed Floor ETF
QFLR
$515M
$94.6K ﹤0.01%
+2,841
New +$97.7K
DEM icon
1596
WisdomTree Emerging Markets High Dividend Fund
DEM
$3.83B
$94.4K ﹤0.01%
1,899
+122
+7% +$6.05K
VTHR icon
1597
Vanguard Russell 3000 ETF
VTHR
$4.63B
$93.5K ﹤0.01%
325
– –
PXH icon
1598
Invesco FTSE RAFI Emerging Markets ETF
PXH
$1.9B
$93.2K ﹤0.01%
3,464
+2
+0.1% +$55
FLRN icon
1599
State Street SPDR Bloomberg Investment Grade Floating Rate ETF
FLRN
$3.07B
$93.2K ﹤0.01%
3,028
+28
+0.9% +$862
JMIA
1600
Jumia Technologies
JMIA
$733M
$93.2K ﹤0.01%
13,500
-200
-1% -$2.02K
62 63
64
65 66

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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.