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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
MBB icon
926
iShares MBS ETF
MBB
$38.9B
$1.17M ﹤0.01%
12,371
+6,778
+121% +$641K
WFC.PRL icon
927
Wells Fargo 7.5% Non Cumv Perp Conv
WFC.PRL
$4.41B
$1.16M ﹤0.01%
1,006
-10
-1% -$11.8K
DG icon
928
Dollar General
DG
$27.5B
$1.16M ﹤0.01%
10,110
+519
+5% +$59K
ALC icon
929
Alcon
ALC
$32.8B
$1.16M ﹤0.01%
17,304
+2,821
+19% +$198K
HAS icon
930
Hasbro
HAS
$12.7B
$1.16M ﹤0.01%
14,047
+359
+3% +$32.3K
WPC icon
931
W.P. Carey
WPC
$15.6B
$1.16M ﹤0.01%
16,187
-275
-2% -$20.2K
CNOB icon
932
Center Bancorp
CNOB
$1.6B
$1.16M ﹤0.01%
34,572
+617
+2% +$18.5K
MNST icon
933
Monster Beverage
MNST
$87.4B
$1.15M ﹤0.01%
23,992
+14,058
+142% +$591K
W icon
934
Wayfair
W
$14.2B
$1.15M ﹤0.01%
12,463
+1,788
+17% +$132K
LIFE
935
Ethos Technologies Inc
LIFE
$2.57B
$1.15M ﹤0.01%
+63,365
New +$1.14M
MP icon
936
MP Materials
MP
$8.76B
$1.14M ﹤0.01%
20,350
+7,859
+63% +$478K
SCHE icon
937
Schwab Emerging Markets Equity ETF
SCHE
$12.7B
$1.14M ﹤0.01%
31,384
+670
+2% +$23.9K
SUSL icon
938
iShares ESG MSCI USA Leaders ETF
SUSL
$1.2B
$1.14M ﹤0.01%
8,559
+125
+1% +$16K
DTM icon
939
DT Midstream
DTM
$12.8B
$1.14M ﹤0.01%
7,738
+160
+2% +$22.6K
RRX icon
940
Regal Rexnord
RRX
$10.2B
$1.13M ﹤0.01%
4,761
+2
+0% +$418
HRZN icon
941
Horizon Technology Finance
HRZN
$314M
$1.13M ﹤0.01%
+239,073
New +$1.03M
VGSH icon
942
Vanguard Short-Term Treasury ETF
VGSH
$34.5B
$1.13M ﹤0.01%
19,396
+2,715
+16% +$158K
TENB icon
943
Tenable Holdings
TENB
$4.2B
$1.12M ﹤0.01%
30,395
-228
-0.7% -$5.36K
IR icon
944
Ingersoll Rand
IR
$27.9B
$1.12M ﹤0.01%
13,656
+35
+0.3% +$2.71K
KRE icon
945
State Street SPDR S&P Regional Banking ETF
KRE
$4.31B
$1.12M ﹤0.01%
14,937
+10,762
+258% +$753K
BATRA icon
946
Atlanta Braves Holdings Series A
BATRA
$3.59B
$1.11M ﹤0.01%
19,653
+49
+0.2% +$2.61K
BCO icon
947
Brink's
BCO
$4.48B
$1.1M ﹤0.01%
11,685
-5,121
-30% -$533K
XPH icon
948
State Street SPDR S&P Pharmaceuticals ETF
XPH
$581M
$1.1M ﹤0.01%
16,556
+5,601
+51% +$328K
KEY icon
949
KeyCorp
KEY
$23.2B
$1.09M ﹤0.01%
47,429
+271
+0.6% +$5.9K
CFG icon
950
Citizens Financial Group
CFG
$29.6B
$1.09M ﹤0.01%
15,486
+156
+1% +$10.1K
36 37
38
39 40

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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.