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William Blair & Company

William Blair & Company Portfolio holdings

AUM $38.4B
1-Year Est. Return 25.71%
This Fund
S&P 500
This Quarter Est. Return
+19.08%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+606.62%
AUM
$38.4B
AUM Growth
+$3.49B
Cap. Flow
-$792M
Cap. Flow %
-2.06%
Top 10 Hldgs %
26.32%
Holding
2,083
New
163
Increased
891
Reduced
708
Closed
85

Top Buys

Rank Stock Value
1
HONA
Honeywell Aerospace
HONA
+$100M
2
ANET icon
Arista Networks
ANET
+$71.2M
3
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$61.8M
4
VTI icon
Vanguard Morningstar Total Stock Market ETF
VTI
+$55.8M
5
MIAX
Miami International Holdings
MIAX
+$49.4M

Top Sells

Rank Stock Value
1
XOM icon
ExxonMobil
XOM
+$161M
2
CPRT icon
Copart
CPRT
+$62M
3
DHR icon
Danaher
DHR
+$59.1M
4
AAPL icon
Apple
AAPL
+$57M
5
VEEV icon
Veeva Systems
VEEV
+$52.2M

Sector Composition

Rank Sector Weight
1 Technology 24.38%
2 Miscellaneous 18.67%
3 Industrials 15.24%
4 Financials 11.07%
5 Healthcare 9.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
FHLC icon
1626
Fidelity MSCI Health Care Index ETF
FHLC
$3.43B
$144K ﹤0.01%
1,863
-207
-10% -$14.9K
MFG icon
1627
Mizuho Financial
MFG
$137B
$144K ﹤0.01%
14,993
+2,778
+23% +$25K
UPRO icon
1628
ProShares UltraPro S&P 500
UPRO
$5.34B
$142K ﹤0.01%
1,000
– –
VSECU
1629
VSE Corp Tangible Equity Units
VSECU
$1.4B
$141K ﹤0.01%
2,443
– –
VGLT icon
1630
Vanguard Long-Term Treasury ETF
VGLT
$10.4B
$141K ﹤0.01%
2,551
-304
-11% -$16.7K
SONO icon
1631
Sonos
SONO
$1.79B
$141K ﹤0.01%
+10,400
New +$152K
EWA icon
1632
iShares MSCI Australia ETF
EWA
$1.29B
$139K ﹤0.01%
4,922
+546
+12% +$15.8K
KELYA icon
1633
Kelly Services Class A
KELYA
$552M
$137K ﹤0.01%
11,192
+77
+0.7% +$801
IWC icon
1634
iShares Micro-Cap ETF
IWC
$1.44B
$136K ﹤0.01%
680
+325
+92% +$59.5K
ARDX icon
1635
Ardelyx
ARDX
$909M
$136K ﹤0.01%
26,635
+289
+1% +$1.76K
PHR icon
1636
Phreesia
PHR
$647M
$136K ﹤0.01%
+13,179
New +$122K
DUHP icon
1637
Dimensional US High Profitability ETF
DUHP
$12.6B
$135K ﹤0.01%
3,244
– –
RPV icon
1638
Invesco S&P 500 Pure Value ETF
RPV
$1.75B
$135K ﹤0.01%
1,183
– –
FEZ icon
1639
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.36B
$134K ﹤0.01%
1,956
+1
+0.1% +$67
USIG icon
1640
iShares Broad USD Investment Grade Corporate Bond ETF
USIG
$17.6B
$134K ﹤0.01%
2,605
-20
-0.8% -$1.02K
FXL icon
1641
First Trust Technology AlphaDEX Fund
FXL
$2.73B
$134K ﹤0.01%
615
– –
HLLY icon
1642
Holley
HLLY
$326M
$133K ﹤0.01%
52,333
+13,473
+35% +$38.2K
NXE icon
1643
NexGen Energy
NXE
$6.35B
$131K ﹤0.01%
13,921
– –
PFM icon
1644
Invesco Dividend Achievers ETF
PFM
$789M
$130K ﹤0.01%
+2,343
New +$127K
NEPH icon
1645
Nephros
NEPH
$48.5M
$129K ﹤0.01%
36,249
– –
CQQQ icon
1646
Invesco China Technology ETF
CQQQ
$2.84B
$129K ﹤0.01%
2,269
+500
+28% +$25.8K
LPL icon
1647
LG Display
LPL
$3.13B
$128K ﹤0.01%
32,300
+6,645
+26% +$30.5K
NB
1648
NioCorp Developments
NB
$528M
$123K ﹤0.01%
25,604
+11,274
+79% +$61.7K
BLV icon
1649
Vanguard Long-Term Bond ETF
BLV
$5.62B
$123K ﹤0.01%
1,788
– –
TALK
1650
DELISTED
Talkspace
TALK
$123K ﹤0.01%
23,679
+59
+0.2% +$306
64 65
66
67 68

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William Blair & Company's Q2 2026 Portfolio in Review

As of Q2 2026, William Blair & Company held 2,083 positions worth $38.4B, up 10% from $34.9B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q2 2026 filing shows 163 new, 891 increased, 708 reduced and 85 closed positions. Its largest new stake was Honeywell Aerospace: 454,071 shares worth $100M. The largest sale was ExxonMobil, an estimated $161M.

By sector, the portfolio is most concentrated in Technology at 24% of assets, up from 22% a quarter earlier, followed by Miscellaneous and Industrials.

  • William Blair & Company's largest Q2 2026 buy was Honeywell Aerospace: 454,071 shares worth $100M.
  • William Blair & Company added most to Arista Networks in Q2 2026, an estimated $71.2M increase.
  • William Blair & Company's biggest Q2 2026 reduction was Copart, cutting an estimated $62M.
  • William Blair & Company fully exited ExxonMobil in Q2 2026, selling an estimated $161M.
  • William Blair & Company's ten largest holdings make up 26% of its $38.4B portfolio in Q2 2026.
  • William Blair & Company opened 163 new positions and closed 85 in Q2 2026.
  • William Blair & Company's portfolio value rose 10% quarter-over-quarter to $38.4B.

Based on William Blair & Company's 13F filing for Q2 2026, filed 11 Aug 2026.