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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
CNTN
951
Canton Strategic Holdings
CNTN
$163M
$1.08M ﹤0.01%
384,692
+10,000
+3% +$31.6K
FDS icon
952
Factset
FDS
$9.85B
$1.08M ﹤0.01%
4,707
+2,941
+167% +$675K
APA icon
953
APA Corp
APA
$16.6B
$1.08M ﹤0.01%
33,142
-714
-2% -$26.8K
IXN icon
954
iShares Global Tech ETF
IXN
$9.18B
$1.08M ﹤0.01%
7,466
-132
-2% -$17K
PSLV icon
955
Sprott Physical Silver Trust
PSLV
$13.1B
$1.07M ﹤0.01%
56,771
-1,432
-2% -$33.7K
LAMR icon
956
Lamar Advertising Co
LAMR
$15B
$1.06M ﹤0.01%
6,821
+955
+16% +$138K
APG icon
957
APi Group
APG
$16B
$1.06M ﹤0.01%
25,093
+646
+3% +$28.2K
CSW
958
CSW Industrials
CSW
$4.72B
$1.06M ﹤0.01%
3,502
+2
+0.1% +$555
WTRG icon
959
Essential Utilities
WTRG
$11.8B
$1.05M ﹤0.01%
27,420
+6,943
+34% +$265K
VPL icon
960
Vanguard FTSE Pacific ETF
VPL
$8.56B
$1.05M ﹤0.01%
9,062
+362
+4% +$40K
ONB icon
961
Old National Bancorp
ONB
$9.87B
$1.05M ﹤0.01%
40,442
+1,655
+4% +$39.8K
AOM icon
962
iShares Core Moderate Allocation ETF
AOM
$1.78B
$1.05M ﹤0.01%
20,981
– –
DCOM icon
963
Dime Commercial Bancshares
DCOM
$1.81B
$1.04M ﹤0.01%
25,614
+217
+0.9% +$8.07K
ALGN icon
964
Align Technology
ALGN
$10.4B
$1.04M ﹤0.01%
6,171
-2,881
-32% -$500K
KVYO icon
965
Klaviyo
KVYO
$4.83B
$1.03M ﹤0.01%
68,288
+7,317
+12% +$121K
AR icon
966
Antero Resources
AR
$11.9B
$1.03M ﹤0.01%
29,332
+10,312
+54% +$380K
BSX icon
967
Boston Scientific
BSX
$63.6B
$1.03M ﹤0.01%
24,066
+3,026
+14% +$164K
IQV icon
968
IQVIA
IQV
$44.4B
$1.03M ﹤0.01%
5,310
-626
-11% -$109K
PAA icon
969
Plains All American Pipeline
PAA
$18.2B
$1.03M ﹤0.01%
46,083
+14,062
+44% +$313K
VICI icon
970
VICI Properties
VICI
$27.3B
$1.03M ﹤0.01%
38,610
-1,037
-3% -$29.1K
H icon
971
Hyatt Hotels
H
$15.1B
$1.02M ﹤0.01%
5,287
+3,071
+139% +$538K
PDBC icon
972
Invesco Actively Managed Exch-Traded Commodity Fd Tr Invesco Optimum Yield Diversified Commodity Strategy No K-1 ETF
PDBC
$7.93B
$1.02M ﹤0.01%
64,505
+312
+0.5% +$5.48K
WRB icon
973
W.R. Berkley
WRB
$26.5B
$1.02M ﹤0.01%
14,522
+2,479
+21% +$166K
UFPI icon
974
UFP Industries
UFPI
$4.55B
$1.02M ﹤0.01%
11,279
+97
+0.9% +$8.45K
TRU icon
975
TransUnion
TRU
$14.8B
$1.02M ﹤0.01%
14,175
+2,762
+24% +$194K
37 38
39
40 41

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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.