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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
ILMN icon
1276
Illumina
ILMN
$33.6B
$441K ﹤0.01%
2,508
+641
+34% +$93.8K
SMCI icon
1277
Super Micro Computer
SMCI
$23.7B
$439K ﹤0.01%
14,972
+3,260
+28% +$104K
DFAT icon
1278
Dimensional US Targeted Value ETF
DFAT
$14.4B
$438K ﹤0.01%
6,266
+1,334
+27% +$89.1K
LNC icon
1279
Lincoln National
LNC
$8.33B
$436K ﹤0.01%
12,331
+1,782
+17% +$64.1K
MTX icon
1280
Minerals Technologies
MTX
$2.11B
$435K ﹤0.01%
5,884
+348
+6% +$26.3K
EES icon
1281
WisdomTree US SmallCap Earnings Fund
EES
$703M
$435K ﹤0.01%
6,419
– –
UBS icon
1282
UBS Group
UBS
$156B
$430K ﹤0.01%
8,667
+70
+0.8% +$3.19K
COFS icon
1283
Choiceone Financial
COFS
$501M
$428K ﹤0.01%
12,589
+228
+2% +$7.09K
TWI icon
1284
Titan International
TWI
$467M
$425K ﹤0.01%
55,060
-68
-0.1% -$524
ARE icon
1285
Alexandria Real Estate Equities
ARE
$9.11B
$421K ﹤0.01%
+7,967
New +$381K
BAX icon
1286
Baxter International
BAX
$12.3B
$421K ﹤0.01%
19,747
-971
-5% -$18.1K
JKHY icon
1287
Jack Henry & Associates
JKHY
$11.6B
$420K ﹤0.01%
3,052
-6
-0.2% -$851
RIVN icon
1288
Rivian
RIVN
$22.7B
$415K ﹤0.01%
23,933
-1,816
-7% -$28.3K
DOCS icon
1289
Doximity
DOCS
$4.72B
$414K ﹤0.01%
19,944
-108,809
-85% -$2.41M
XENE icon
1290
Xenon Pharmaceuticals
XENE
$5.52B
$406K ﹤0.01%
+6,730
New +$374K
RWL icon
1291
Invesco S&P 500 Revenue ETF
RWL
$9.97B
$405K ﹤0.01%
3,167
+170
+6% +$21.1K
QLD icon
1292
ProShares Ultra QQQ
QLD
$13.7B
$403K ﹤0.01%
4,170
+898
+27% +$77.2K
EMBJ
1293
Embraer S.A. ADS
EMBJ
$13.4B
$403K ﹤0.01%
+6,297
New +$387K
AA icon
1294
Alcoa
AA
$12.2B
$403K ﹤0.01%
7,734
+2,005
+35% +$134K
AWR icon
1295
American States Water
AWR
$3.44B
$402K ﹤0.01%
4,871
+1,455
+43% +$113K
IYC icon
1296
iShares US Consumer Discretionary ETF
IYC
$1.15B
$402K ﹤0.01%
3,979
+2
+0.1% +$203
NVR icon
1297
NVR
NVR
$16.8B
$402K ﹤0.01%
59
+26
+79% +$165K
MRTN icon
1298
Marten Transport
MRTN
$1.14B
$402K ﹤0.01%
23,158
+358
+2% +$5.69K
GRBK icon
1299
Green Brick Partners
GRBK
$2.93B
$402K ﹤0.01%
5,018
-4
-0.1% -$276
HUBG icon
1300
HUB Group
HUBG
$2.05B
$401K ﹤0.01%
9,157
-1,070
-10% -$44.9K
50 51
52
53 54

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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.