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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
STWD icon
351
Starwood Property Trust
STWD
$5.63B
$11.1M 0.03%
677,305
+4,889
+0.7% +$85.1K
MPC icon
352
Marathon Petroleum
MPC
$115B
$11M 0.03%
43,095
+1,963
+5% +$482K
SNOW icon
353
Snowflake
SNOW
$114B
$10.9M 0.03%
42,885
+16,439
+62% +$3.03M
AVY icon
354
Avery Dennison
AVY
$13B
$10.9M 0.03%
67,137
+3,886
+6% +$633K
EFX icon
355
Equifax
EFX
$19.6B
$10.8M 0.03%
68,080
+1,016
+2% +$173K
LNG icon
356
Cheniere Energy
LNG
$56B
$10.8M 0.03%
45,210
-4,647
-9% -$1.16M
IGV icon
357
iShares Expanded Tech-Software Sector ETF
IGV
$13.9B
$10.7M 0.03%
118,279
+41,822
+55% +$3.72M
VCYT icon
358
Veracyte
VCYT
$3.23B
$10.6M 0.03%
179,712
-15,175
-8% -$636K
VTWO icon
359
Vanguard Russell 2000 ETF
VTWO
$16.8B
$10.5M 0.03%
86,277
+3,542
+4% +$402K
ARES icon
360
Ares Management
ARES
$29.4B
$10.3M 0.03%
92,893
-8,242
-8% -$989K
EQT icon
361
EQT Corp
EQT
$33.2B
$10.3M 0.03%
194,272
-126,920
-40% -$7.12M
HBAN icon
362
Huntington Bancshares
HBAN
$33.8B
$10.3M 0.03%
578,787
+19,216
+3% +$317K
NOBL icon
363
ProShares S&P 500 Dividend Aristocrats ETF
NOBL
$11.4B
$10.2M 0.03%
181,990
+23,602
+15% +$1.28M
TPL icon
364
Texas Pacific Land
TPL
$25.6B
$10.2M 0.03%
23,330
+66
+0.3% +$26.8K
PFEB icon
365
Innovator US Equity Power Buffer ETF February
PFEB
$925M
$10.2M 0.03%
236,401
-10,291
-4% -$435K
SPCX
366
SpaceX
SPCX
$1.89T
$10.2M 0.03%
+59,525
New +$10.1M
IRT icon
367
Independence Realty Trust
IRT
$3.58B
$10.1M 0.03%
603,622
-8,148
-1% -$132K
BE icon
368
Bloom Energy
BE
$76.4B
$10M 0.03%
33,153
+821
+3% +$210K
PHO icon
369
Invesco Water Resources ETF
PHO
$1.93B
$9.98M 0.03%
144,533
+2,483
+2% +$168K
EFG icon
370
iShares MSCI EAFE Growth ETF
EFG
$16.4B
$9.95M 0.03%
79,949
+56
+0.1% +$6.75K
CIEN icon
371
Ciena
CIEN
$47.4B
$9.91M 0.03%
20,201
+706
+4% +$360K
BKNG icon
372
Booking.com
BKNG
$129B
$9.89M 0.03%
55,479
+2,054
+4% +$350K
TEL icon
373
TE Connectivity
TEL
$58.3B
$9.89M 0.03%
49,035
+463
+1% +$98.7K
MDT icon
374
Medtronic
MDT
$120B
$9.71M 0.03%
124,119
-29,128
-19% -$2.35M
CCJ icon
375
Cameco
CCJ
$39.7B
$9.61M 0.03%
94,389
+61,861
+190% +$6.94M
13 14
15
16 17

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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.