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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
DAR icon
1376
Darling Ingredients
DAR
$10.5B
$332K ﹤0.01%
6,087
+972
+19% +$58K
RJF icon
1377
Raymond James Financial
RJF
$32.6B
$332K ﹤0.01%
2,184
-546
-20% -$82.9K
OLN icon
1378
Olin
OLN
$1.93B
$331K ﹤0.01%
16,703
+4,562
+38% +$119K
EWT icon
1379
iShares MSCI Taiwan ETF
EWT
$11.6B
$331K ﹤0.01%
3,045
-250
-8% -$23.4K
ONTO icon
1380
Onto Innovation
ONTO
$12.1B
$330K ﹤0.01%
+873
New +$247K
SM icon
1381
SM Energy
SM
$9.6B
$328K ﹤0.01%
12,551
-114
-0.9% -$3.42K
CCNE icon
1382
CNB Financial Corp
CCNE
$1.02B
$327K ﹤0.01%
9,688
+130
+1% +$4.04K
VOD icon
1383
Vodafone
VOD
$40.9B
$326K ﹤0.01%
24,627
+2,104
+9% +$31.9K
NSIT icon
1384
Insight Enterprises
NSIT
$4.75B
$325K ﹤0.01%
+2,669
New +$244K
SHE icon
1385
State Street SPDR MSCI USA Gender Diversity ETF
SHE
$328M
$324K ﹤0.01%
2,096
+188
+10% +$27.7K
OTF
1386
Blue Owl Technology Finance Corp
OTF
$4.83B
$323K ﹤0.01%
31,213
+8,597
+38% +$95.6K
PBR icon
1387
Petrobras
PBR
$139B
$321K ﹤0.01%
19,838
-1,201
-6% -$23.5K
TKR icon
1388
Timken Company
TKR
$8.11B
$320K ﹤0.01%
2,203
-1,779
-45% -$214K
LW icon
1389
Lamb Weston
LW
$6.54B
$320K ﹤0.01%
7,406
+429
+6% +$18.5K
FTS icon
1390
Fortis
FTS
$27.5B
$320K ﹤0.01%
5,587
+144
+3% +$8.12K
DVA icon
1391
DaVita
DVA
$12.1B
$319K ﹤0.01%
+1,434
New +$261K
PTC icon
1392
PTC
PTC
$14.7B
$318K ﹤0.01%
2,803
-48
-2% -$6.48K
MSA icon
1393
Mine Safety
MSA
$6.9B
$318K ﹤0.01%
1,824
+448
+33% +$75K
NIC icon
1394
Nicolet Bankshares
NIC
$3.61B
$317K ﹤0.01%
1,916
-1,092
-36% -$161K
IKT icon
1395
Inhibikase Therapeutics
IKT
$325M
$317K ﹤0.01%
156,080
-1,908
-1% -$3.42K
KTOS icon
1396
Kratos Defense & Security Solutions
KTOS
$8.86B
$316K ﹤0.01%
6,342
-1,170
-16% -$70.8K
ALLE icon
1397
Allegion
ALLE
$13.1B
$315K ﹤0.01%
2,241
+72
+3% +$9.79K
CHTR icon
1398
Charter Communications
CHTR
$17.2B
$315K ﹤0.01%
+2,214
New +$369K
FUSB icon
1399
First US Bancshares
FUSB
$90.7M
$314K ﹤0.01%
19,000
– –
IQLT icon
1400
iShares MSCI Intl Quality Factor ETF
IQLT
$13.8B
$314K ﹤0.01%
6,345
-509
-7% -$24.9K
54 55
56
57 58

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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.