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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
BSV icon
226
Vanguard Short-Term Bond ETF
BSV
$46.2B
$24.7M 0.06%
317,149
-25,376
-7% -$1.98M
MLM icon
227
Martin Marietta Materials
MLM
$36.2B
$24.5M 0.06%
42,488
-1,349
-3% -$800K
GDX icon
228
VanEck Gold Miners ETF
GDX
$28.3B
$24.2M 0.06%
320,783
-323
-0.1% -$28.5K
GL icon
229
Globe Life
GL
$13.2B
$24.2M 0.06%
135,435
+982
+0.7% +$154K
RGA icon
230
Reinsurance Group of America
RGA
$16.2B
$24.2M 0.06%
113,709
-510
-0.4% -$106K
BMY icon
231
Bristol-Myers Squibb
BMY
$131B
$24M 0.06%
416,247
-1,412
-0.3% -$81.1K
RMD icon
232
ResMed
RMD
$32.2B
$23.9M 0.06%
122,521
-38,821
-24% -$8.05M
FTNT icon
233
Fortinet
FTNT
$125B
$23.6M 0.06%
153,799
-3,021
-2% -$349K
COF icon
234
Capital One
COF
$127B
$23.6M 0.06%
117,708
-3,592
-3% -$687K
HWM icon
235
Howmet Aerospace
HWM
$90.6B
$23.6M 0.06%
87,746
+2,607
+3% +$669K
EQIX icon
236
Equinix
EQIX
$102B
$23.3M 0.06%
22,372
+686
+3% +$734K
SYY icon
237
Sysco
SYY
$40B
$23.2M 0.06%
277,805
+81,277
+41% +$6.15M
ESGD icon
238
iShares ESG Aware MSCI EAFE ETF
ESGD
$12.1B
$23.2M 0.06%
225,764
-5,783
-2% -$587K
NTRS icon
239
Northern Trust
NTRS
$34.6B
$22.6M 0.06%
130,251
+808
+0.6% +$133K
SHW icon
240
Sherwin-Williams
SHW
$78.5B
$22.3M 0.06%
64,693
-11,772
-15% -$3.76M
VB icon
241
Vanguard Morningstar Small-Cap ETF
VB
$78.9B
$22.2M 0.06%
73,321
+9,749
+15% +$2.79M
ZM icon
242
Zoom
ZM
$27.8B
$22.2M 0.06%
256,974
+143,460
+126% +$13.6M
SU icon
243
Suncor Energy
SU
$80.4B
$22M 0.06%
410,120
-2,054
-0.5% -$130K
MDLN
244
Medline Inc
MDLN
$28.6B
$22M 0.06%
557,911
-607,519
-52% -$24.5M
CGGR icon
245
Capital Group Growth ETF
CGGR
$25.2B
$22M 0.06%
465,338
+43,664
+10% +$1.97M
WST icon
246
West Pharmaceutical
WST
$24.4B
$22M 0.06%
61,152
-1,314
-2% -$402K
VMC icon
247
Vulcan Materials
VMC
$32.7B
$21.3M 0.06%
72,224
+4,009
+6% +$1.15M
FDX icon
248
FedEx
FDX
$74B
$21.2M 0.06%
67,562
+38,528
+133% +$14M
DIA icon
249
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.7B
$21.1M 0.06%
40,400
-4,159
-9% -$2.08M
EME icon
250
Emcor
EME
$34.4B
$21.1M 0.05%
25,375
+11,119
+78% +$9.41M
8 9
10
11 12

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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.