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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
MOD icon
176
Modine Manufacturing
MOD
$10.1B
$36.4M 0.09%
136,155
+54,379
+66% +$14.3M
FERG icon
177
Ferguson
FERG
$43.1B
$36.3M 0.09%
153,047
+5,740
+4% +$1.38M
TECH icon
178
Bio-Techne
TECH
$11.3B
$36.3M 0.09%
513,573
-350,756
-41% -$18.9M
SXI icon
179
Standex International
SXI
$3.31B
$36.2M 0.09%
101,198
+83,666
+477% +$23.4M
ACWX icon
180
iShares MSCI ACWI ex US ETF
ACWX
$12.3B
$35.9M 0.09%
471,227
-56,392
-11% -$4.2M
SCHD icon
181
Schwab US Dividend Equity ETF
SCHD
$112B
$35.2M 0.09%
1,108,518
+12,725
+1% +$404K
PSX icon
182
Phillips 66
PSX
$103B
$34.5M 0.09%
204,103
-2,821
-1% -$486K
WFC icon
183
Wells Fargo
WFC
$273B
$34.5M 0.09%
417,307
-49,905
-11% -$4.01M
GILD icon
184
Gilead Sciences
GILD
$182B
$34.5M 0.09%
272,940
-67,405
-20% -$8.88M
PFE icon
185
Pfizer
PFE
$158B
$33.9M 0.09%
1,406,138
+36,041
+3% +$943K
DIS icon
186
Walt Disney
DIS
$188B
$33.8M 0.09%
351,627
+8,369
+2% +$853K
BCPC
187
Balchem Corp
BCPC
$5.32B
$33.4M 0.09%
197,933
-5,586
-3% -$928K
SPXC icon
188
SPX Corp
SPXC
$9.61B
$33.1M 0.09%
134,956
-986
-0.7% -$216K
IWB icon
189
iShares Russell 1000 ETF
IWB
$48.7B
$33.1M 0.09%
80,773
-122
-0.2% -$48.4K
FNV icon
190
Franco-Nevada
FNV
$51.3B
$32.6M 0.08%
156,208
-2,048
-1% -$477K
PDEC icon
191
Innovator US Equity Power Buffer ETF December
PDEC
$986M
$32.6M 0.08%
709,499
-25,491
-3% -$1.15M
VOE icon
192
Vanguard Morningstar Mid-Cap Value ETF
VOE
$23.9B
$32.2M 0.08%
163,166
-14,384
-8% -$2.78M
CME icon
193
CME Group
CME
$101B
$32.2M 0.08%
145,845
-58,689
-29% -$16.2M
EW icon
194
Edwards Lifesciences
EW
$49.3B
$32.2M 0.08%
356,032
+40,342
+13% +$3.38M
MTD icon
195
Mettler-Toledo International
MTD
$25.9B
$31.8M 0.08%
24,905
-699
-3% -$843K
INTU icon
196
Intuit
INTU
$90.6B
$31.5M 0.08%
120,609
-31,945
-21% -$11.1M
RSG icon
197
Republic Services
RSG
$68.2B
$31M 0.08%
145,683
+4,021
+3% +$841K
ZBRA icon
198
Zebra Technologies
ZBRA
$16.6B
$30.3M 0.08%
114,936
-9,924
-8% -$2.33M
UNH icon
199
UnitedHealth
UNH
$344B
$29.9M 0.08%
72,052
-2,471
-3% -$916K
VYM icon
200
Vanguard High Dividend Yield ETF
VYM
$82.1B
$29.7M 0.08%
188,188
+3,489
+2% +$545K
6 7
8
9 10

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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.