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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
NN icon
976
NextNav
NN
$2.52B
$1.02M ﹤0.01%
57,071
+71
+0.1% +$1.37K
XPO icon
977
XPO
XPO
$20.9B
$1.01M ﹤0.01%
4,920
-36
-0.7% -$7.62K
IYH icon
978
iShares US Healthcare ETF
IYH
$3.64B
$1.01M ﹤0.01%
15,040
+1,608
+12% +$101K
LOB icon
979
Live Oak Bancshares
LOB
$1.81B
$1M ﹤0.01%
24,576
+53
+0.2% +$1.98K
HII icon
980
Huntington Ingalls Industries
HII
$11B
$1M ﹤0.01%
3,581
+235
+7% +$78.5K
HYGV icon
981
Northern Trust High Yield Value-Scored Bond ETF
HYGV
$1.06B
$993K ﹤0.01%
24,653
+22,729
+1,181% +$915K
SUSB icon
982
iShares ESG Aware 1-5 Year USD Corporate Bond ETF
SUSB
$1.29B
$992K ﹤0.01%
39,706
-3,179
-7% -$79.5K
RMAX
983
DELISTED
RE/MAX Holdings
RMAX
$992K ﹤0.01%
100,627
-6,210
-6% -$54.2K
ATMP icon
984
iPath Select MLP ETN
ATMP
$640M
$986K ﹤0.01%
28,574
-513
-2% -$17.7K
BFEB icon
985
Innovator US Equity Buffer ETF February
BFEB
$258M
$981K ﹤0.01%
18,642
– –
HSBC icon
986
HSBC
HSBC
$350B
$980K ﹤0.01%
10,307
+461
+5% +$42.1K
RBLX icon
987
Roblox
RBLX
$35.9B
$980K ﹤0.01%
18,016
-3,423
-16% -$170K
CIGI icon
988
Colliers International
CIGI
$4.63B
$977K ﹤0.01%
10,421
-21,932
-68% -$2.21M
MOO icon
989
VanEck Agribusiness ETF
MOO
$1.16B
$976K ﹤0.01%
12,318
-300
-2% -$24.4K
ASX icon
990
ASE Group
ASX
$96.6B
$975K ﹤0.01%
21,601
+11,196
+108% +$376K
RPG icon
991
Invesco S&P 500 Pure Growth ETF
RPG
$1.85B
$975K ﹤0.01%
15,264
– –
LB
992
LandBridge Co
LB
$2.48B
$973K ﹤0.01%
12,279
-297
-2% -$20.4K
BKSY icon
993
BlackSky Technology
BKSY
$875M
$967K ﹤0.01%
+34,630
New +$1.25M
VTES icon
994
Vanguard Short-Term Tax-Exempt Bond ETF
VTES
$2.39B
$953K ﹤0.01%
9,407
-885
-9% -$89.5K
MMSI icon
995
Merit Medical Systems
MMSI
$5.15B
$953K ﹤0.01%
13,744
+1,685
+14% +$111K
ALB icon
996
Albemarle
ALB
$13.4B
$951K ﹤0.01%
7,041
-412
-6% -$72.7K
COLD icon
997
Americold
COLD
$4.28B
$949K ﹤0.01%
60,398
+3,707
+7% +$50.9K
U icon
998
Unity
U
$18.9B
$945K ﹤0.01%
33,073
-66,420
-67% -$1.77M
PCG icon
999
PG&E
PCG
$29B
$943K ﹤0.01%
56,059
+37,778
+207% +$636K
DB icon
1000
Deutsche Bank
DB
$72.7B
$942K ﹤0.01%
27,893
+1,493
+6% +$48.4K
38 39
40
41 42

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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.