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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
ELVA
1551
Electrovaya
ELVA
$374M
$124K ﹤0.01%
+15,850
New +$137K
BLV icon
1552
Vanguard Long-Term Bond ETF
BLV
$5.78B
$123K ﹤0.01%
1,788
– –
VSECU
1553
VSE Corp Tangible Equity Units
VSECU
$1.45B
$123K ﹤0.01%
+2,443
New +$131K
SCHP icon
1554
Schwab US TIPS ETF
SCHP
$16.3B
$122K ﹤0.01%
4,601
-102
-2% -$2.72K
TALK icon
1555
Talkspace
TALK
$874M
$122K ﹤0.01%
23,620
– –
BBDC icon
1556
Barings BDC
BBDC
$874M
$122K ﹤0.01%
+14,833
New +$130K
EWA icon
1557
iShares MSCI Australia ETF
EWA
$1.38B
$121K ﹤0.01%
4,376
+1,928
+79% +$54.2K
FEZ icon
1558
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.27B
$121K ﹤0.01%
1,955
+200
+11% +$13.1K
AEF
1559
abrdn Emerging Markets Equity Income Fund
AEF
$329M
$121K ﹤0.01%
16,538
-9
-0.1% -$70
XJR icon
1560
iShares ESG Screened S&P Small-Cap ETF
XJR
$185M
$120K ﹤0.01%
2,753
+335
+14% +$15K
PSEC icon
1561
Prospect Capital
PSEC
$1.11B
$120K ﹤0.01%
45,900
+200
+0.4% +$548
STUB
1562
StubHub Holdings
STUB
$3.15B
$120K ﹤0.01%
+19,158
New +$199K
HLLY icon
1563
Holley
HLLY
$331M
$119K ﹤0.01%
38,860
+310
+0.8% +$1.18K
DUHP icon
1564
Dimensional US High Profitability ETF
DUHP
$12.2B
$119K ﹤0.01%
+3,244
New +$124K
CGBD icon
1565
Carlyle Secured Lending
CGBD
$715M
$119K ﹤0.01%
+10,894
New +$129K
BTBT icon
1566
Bit Digital
BTBT
$421M
$118K ﹤0.01%
90,000
– –
TAN icon
1567
Invesco Solar ETF
TAN
$1.37B
$118K ﹤0.01%
2,114
– –
UMC icon
1568
United Microelectronic
UMC
$42.8B
$118K ﹤0.01%
+13,098
New +$128K
AVPT icon
1569
AvePoint
AVPT
$2.76B
$117K ﹤0.01%
12,300
-1,400
-10% -$15.8K
EVEX icon
1570
Eve Holding
EVEX
$791M
$117K ﹤0.01%
47,036
+19
+0% +$65
RSPG icon
1571
Invesco S&P 500 Equal Weight Energy ETF
RSPG
$555M
$115K ﹤0.01%
1,055
+2
+0.2% +$191
SPHD icon
1572
Invesco S&P 500 High Dividend Low Volatility ETF
SPHD
$3.43B
$115K ﹤0.01%
2,324
+415
+22% +$20.9K
VMBS icon
1573
Vanguard Mortgage-Backed Securities ETF
VMBS
$15.4B
$114K ﹤0.01%
2,430
-1,352
-36% -$63.8K
PNQI icon
1574
Invesco NASDAQ Internet ETF
PNQI
$527M
$114K ﹤0.01%
2,545
– –
NUS icon
1575
Nu Skin
NUS
$255M
$113K ﹤0.01%
15,515
+361
+2% +$3.27K
61 62
63
64 65

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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.