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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
IYF icon
826
iShares US Financials ETF
IYF
$4.35B
$1.66M ﹤0.01%
12,996
+7
+0.1% +$869
RKT icon
827
Rocket Companies
RKT
$37.3B
$1.66M ﹤0.01%
105,151
+1,436
+1% +$20.7K
URTH icon
828
iShares MSCI World ETF
URTH
$8.14B
$1.65M ﹤0.01%
8,124
+695
+9% +$137K
AEM icon
829
Agnico Eagle Mines
AEM
$99.7B
$1.64M ﹤0.01%
10,584
-328
-3% -$60.8K
WTW icon
830
Willis Towers Watson
WTW
$29.9B
$1.63M ﹤0.01%
6,230
+32
+0.5% +$8.56K
SPSB icon
831
State Street SPDR Portfolio Short Term Corporate Bond ETF
SPSB
$11.3B
$1.63M ﹤0.01%
54,217
+1,379
+3% +$41.4K
ZBH icon
832
Zimmer Biomet
ZBH
$18.8B
$1.63M ﹤0.01%
18,882
-369
-2% -$32.4K
PFF icon
833
iShares Preferred and Income Securities ETF
PFF
$12.6B
$1.61M ﹤0.01%
52,946
-2,171
-4% -$67.6K
FLJP icon
834
Franklin FTSE Japan ETF
FLJP
$4.14B
$1.61M ﹤0.01%
40,460
+12,599
+45% +$489K
DRI icon
835
Darden Restaurants
DRI
$23.7B
$1.6M ﹤0.01%
7,773
-211
-3% -$42.3K
QDEF icon
836
Northern Trust Quality Dividend Defensive ETF
QDEF
$553M
$1.59M ﹤0.01%
18,224
+57
+0.3% +$4.87K
KAI icon
837
Kadant
KAI
$3.14B
$1.58M ﹤0.01%
5,043
-6,100
-55% -$1.9M
RIG icon
838
Transocean
RIG
$6.63B
$1.58M ﹤0.01%
324,002
-14,801
-4% -$92.5K
TFC icon
839
Truist Financial
TFC
$61.6B
$1.58M ﹤0.01%
31,790
+1,937
+6% +$95.3K
JBHT icon
840
JB Hunt Transport Services
JBHT
$25.6B
$1.57M ﹤0.01%
5,435
+1,862
+52% +$478K
ICLR icon
841
Icon
ICLR
$13.3B
$1.57M ﹤0.01%
9,048
+251
+3% +$32K
XLB icon
842
State Street Materials Select Sector SPDR ETF
XLB
$8.39B
$1.56M ﹤0.01%
30,786
+2,340
+8% +$120K
BSY icon
843
Bentley Systems
BSY
$9.63B
$1.56M ﹤0.01%
52,076
+6,846
+15% +$223K
BLDR icon
844
Builders FirstSource
BLDR
$6.48B
$1.55M ﹤0.01%
17,296
+3,846
+29% +$307K
AIG icon
845
American International
AIG
$39.7B
$1.54M ﹤0.01%
20,707
+3,374
+19% +$256K
DIOD icon
846
Diodes
DIOD
$4.16B
$1.53M ﹤0.01%
13,960
-45
-0.3% -$4.57K
XSD icon
847
State Street SPDR S&P Semiconductor ETF
XSD
$2.59B
$1.51M ﹤0.01%
2,427
+1,061
+78% +$556K
MINT icon
848
PIMCO Enhanced Short Maturity Active Exchange-Traded Fund
MINT
$17.6B
$1.5M ﹤0.01%
14,844
-343
-2% -$34.5K
MXL icon
849
MaxLinear
MXL
$6.09B
$1.5M ﹤0.01%
11,679
-2,436
-17% -$172K
XLRE icon
850
State Street Real Estate Select Sector SPDR ETF
XLRE
$8B
$1.49M ﹤0.01%
33,828
+2,780
+9% +$122K
32 33
34
35 36

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TWC
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PIF
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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.