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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
PJAN icon
201
Innovator US Equity Power Buffer ETF January
PJAN
$1.42B
$29.3M 0.08%
592,986
-32,528
-5% -$1.58M
VXUS icon
202
Vanguard Total International Stock ETF
VXUS
$163B
$29.3M 0.08%
342,216
+75,288
+28% +$6.3M
MCO icon
203
Moody's
MCO
$82.8B
$28.8M 0.08%
63,605
-3,349
-5% -$1.5M
CHD icon
204
Church & Dwight Co
CHD
$22.4B
$28.6M 0.07%
295,661
-13,370
-4% -$1.28M
C icon
205
Citigroup
C
$228B
$28.6M 0.07%
204,359
+16,696
+9% +$2.17M
IRM icon
206
Iron Mountain
IRM
$33.4B
$28.3M 0.07%
224,376
-873
-0.4% -$107K
ACN icon
207
Accenture
ACN
$119B
$28M 0.07%
224,741
-101,332
-31% -$17.6M
XMTR icon
208
Xometry
XMTR
$4.87B
$27.9M 0.07%
288,858
-22,714
-7% -$1.62M
AMLP icon
209
Alerian MLP ETF
AMLP
$13.5B
$27.6M 0.07%
532,049
-2,834
-0.5% -$149K
PH icon
210
Parker-Hannifin
PH
$117B
$27.6M 0.07%
28,197
+625
+2% +$573K
IEMG icon
211
iShares Core MSCI Emerging Markets ETF
IEMG
$159B
$27.4M 0.07%
330,176
-72,287
-18% -$5.76M
BOKF icon
212
BOK Financial
BOKF
$8.29B
$27M 0.07%
194,747
-468
-0.2% -$61.9K
GH icon
213
Guardant Health
GH
$22.5B
$26.9M 0.07%
179,266
+75,622
+73% +$8.22M
NOVT icon
214
Novanta
NOVT
$5.3B
$26.7M 0.07%
164,844
+31,727
+24% +$4.59M
TWST icon
215
Twist Bioscience
TWST
$8.93B
$26.4M 0.07%
256,556
+199,139
+347% +$13M
XLK icon
216
State Street Technology Select Sector SPDR ETF
XLK
$120B
$26.2M 0.07%
137,534
-26,122
-16% -$4.46M
DVY icon
217
iShares Select Dividend ETF
DVY
$23.6B
$26.1M 0.07%
167,181
+1,833
+1% +$282K
PJUL icon
218
Innovator US Equity Power Buffer ETF July
PJUL
$1.29B
$26.1M 0.07%
533,957
-76,670
-13% -$3.69M
VZ icon
219
Verizon
VZ
$213B
$25.9M 0.07%
612,014
+5,573
+0.9% +$261K
TTAN
220
ServiceTitan Inc
TTAN
$5.69B
$25.7M 0.07%
363,384
+306,036
+534% +$19.7M
ARGX icon
221
argenx
ARGX
$62B
$25.7M 0.07%
27,666
+5,259
+23% +$4.34M
SPHQ icon
222
Invesco S&P 500 Quality ETF
SPHQ
$18.6B
$25.6M 0.07%
284,460
+15,432
+6% +$1.28M
BLBD icon
223
Blue Bird Corp
BLBD
$1.98B
$25.3M 0.07%
320,966
+230
+0.1% +$15.6K
DELL icon
224
Dell
DELL
$340B
$25.1M 0.07%
58,198
+37,230
+178% +$10.8M
APD icon
225
Air Products & Chemicals
APD
$63.9B
$24.9M 0.06%
84,963
-20,883
-20% -$6.07M
7 8
9
10 11

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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.