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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
MDGL icon
1201
Madrigal Pharmaceuticals
MDGL
$12.1B
$542K ﹤0.01%
1,009
+8
+0.8% +$4.1K
CLH icon
1202
Clean Harbors
CLH
$16.8B
$541K ﹤0.01%
1,811
-840
-32% -$248K
GPN icon
1203
Global Payments
GPN
$23.5B
$540K ﹤0.01%
7,444
+4,860
+188% +$335K
KNX icon
1204
Knight Transportation
KNX
$11.1B
$540K ﹤0.01%
6,936
+2,407
+53% +$167K
POR icon
1205
Portland General Electric
POR
$5.58B
$535K ﹤0.01%
10,313
+1,261
+14% +$63.9K
FDN icon
1206
First Trust Dow Jones Internet Index Fund ETF
FDN
$5.31B
$534K ﹤0.01%
2,019
– –
ISTB icon
1207
iShares Core 1-5 Year USD Bond ETF
ISTB
$5.09B
$534K ﹤0.01%
11,072
+111
+1% +$5.36K
SHM icon
1208
State Street SPDR Nuveen ICE Short Term Municipal Bond ETF
SHM
$3.49B
$524K ﹤0.01%
10,931
-612
-5% -$29.3K
USMC icon
1209
Principal Exchange-Traded Funds Principal US Mega-Cap ETF
USMC
$5.05B
$524K ﹤0.01%
7,068
+263
+4% +$18.8K
UYG icon
1210
ProShares Ultra Financials
UYG
$796M
$523K ﹤0.01%
6,115
– –
SOLV icon
1211
Solventum
SOLV
$15.3B
$523K ﹤0.01%
6,779
+407
+6% +$29.7K
CBSH icon
1212
Commerce Bancshares
CBSH
$8.39B
$520K ﹤0.01%
+9,002
New +$472K
VCR icon
1213
Vanguard Consumer Discretionary ETF
VCR
$5.74B
$519K ﹤0.01%
1,308
+251
+24% +$97.5K
IVZ icon
1214
Invesco
IVZ
$13.6B
$517K ﹤0.01%
+19,608
New +$520K
THRY icon
1215
Thryv Holdings
THRY
$88.4M
$516K ﹤0.01%
130,848
-3,845
-3% -$13.7K
HEEM icon
1216
iShares Currency Hedged MSCI Emerging Markets
HEEM
$287M
$515K ﹤0.01%
11,506
+4,626
+67% +$195K
WCC
1217
WESCO International
WCC
$16.3B
$514K ﹤0.01%
1,487
+322
+28% +$109K
IYK icon
1218
iShares US Consumer Staples ETF
IYK
$1.39B
$513K ﹤0.01%
7,067
+14
+0.2% +$1K
FCCO icon
1219
First Community Corp
FCCO
$321M
$513K ﹤0.01%
15,697
+70
+0.4% +$2.15K
RRR icon
1220
Red Rock Resorts
RRR
$3.18B
$513K ﹤0.01%
+7,881
New +$448K
APLD icon
1221
Applied Digital
APLD
$6.66B
$511K ﹤0.01%
13,693
-1,512
-10% -$58.4K
THW
1222
abrdn World Healthcare Fund
THW
$542M
$509K ﹤0.01%
38,000
– –
BWIN
1223
Baldwin Insurance Group
BWIN
$3.15B
$509K ﹤0.01%
19,152
-2,802
-13% -$60.6K
EFAV icon
1224
iShares MSCI EAFE Min Vol Factor ETF
EFAV
$5.45B
$508K ﹤0.01%
5,789
+43
+0.7% +$3.9K
EWW icon
1225
iShares MSCI Mexico ETF
EWW
$1.71B
$508K ﹤0.01%
6,746
+73
+1% +$5.67K
47 48
49
50 51

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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.