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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
GLTR icon
1226
abrdn Physical Precious Metals Basket Shares ETF
GLTR
$2.66B
$507K ﹤0.01%
2,798
-109
-4% -$23K
EZM icon
1227
WisdomTree US MidCap Fund
EZM
$924M
$506K ﹤0.01%
6,682
-110
-2% -$7.97K
CINF icon
1228
Cincinnati Financial
CINF
$26.3B
$506K ﹤0.01%
2,733
+513
+23% +$85.1K
OBDC icon
1229
Blue Owl Capital
OBDC
$5.46B
$504K ﹤0.01%
46,380
+567
+1% +$6.34K
CLOV icon
1230
Clover Health Investments
CLOV
$2.48B
$501K ﹤0.01%
95,624
+831
+0.9% +$2.82K
VIA
1231
Via Transportation Inc
VIA
$2.13B
$500K ﹤0.01%
27,587
+7,938
+40% +$124K
BCS icon
1232
Barclays
BCS
$85.3B
$499K ﹤0.01%
+18,594
New +$448K
RIOT icon
1233
Riot Platforms
RIOT
$7.39B
$498K ﹤0.01%
18,191
+454
+3% +$10.2K
FRT icon
1234
Federal Realty Investment Trust
FRT
$9.9B
$498K ﹤0.01%
4,034
+1,036
+35% +$121K
EGP icon
1235
EastGroup Properties
EGP
$10.7B
$496K ﹤0.01%
2,447
-60
-2% -$12K
BILL icon
1236
BILL Holdings
BILL
$4.26B
$495K ﹤0.01%
13,680
+1,262
+10% +$46.5K
CUBE icon
1237
CubeSmart
CUBE
$8.99B
$494K ﹤0.01%
+12,432
New +$495K
FWONK icon
1238
Liberty Media Series C
FWONK
$23.8B
$494K ﹤0.01%
5,189
+218
+4% +$19.5K
MORN icon
1239
Morningstar
MORN
$7.57B
$493K ﹤0.01%
3,162
+1,099
+53% +$191K
PRIM icon
1240
Primoris Services
PRIM
$4.13B
$491K ﹤0.01%
4,953
-177
-3% -$23.3K
MAGS icon
1241
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$4.32B
$490K ﹤0.01%
7,625
+1,216
+19% +$80.3K
UGA icon
1242
United States Gasoline Fund
UGA
$188M
$489K ﹤0.01%
4,750
+2,750
+138% +$298K
CGW icon
1243
Invesco S&P Global Water Index ETF
CGW
$1.02B
$489K ﹤0.01%
7,434
+4,490
+153% +$288K
FE icon
1244
FirstEnergy
FE
$26.2B
$485K ﹤0.01%
10,200
+120
+1% +$5.7K
IX icon
1245
ORIX
IX
$41.3B
$483K ﹤0.01%
+12,703
New +$452K
STLD icon
1246
Steel Dynamics
STLD
$34.3B
$482K ﹤0.01%
2,102
-356
-14% -$83.4K
CDW icon
1247
CDW
CDW
$19.2B
$481K ﹤0.01%
3,420
+356
+12% +$44.7K
RVMD icon
1248
Revolution Medicines
RVMD
$43.9B
$479K ﹤0.01%
+2,556
New +$373K
XYLD icon
1249
Global X S&P 500 Covered Call ETF
XYLD
$3.33B
$476K ﹤0.01%
11,678
+42
+0.4% +$1.69K
NEO icon
1250
NeoGenomics
NEO
$2.43B
$476K ﹤0.01%
32,622
+1,911
+6% +$18.4K
48 49
50
51 52

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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.