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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
MRCY icon
376
Mercury Systems
MRCY
$5.25B
$9.51M 0.02%
77,712
-1,079
-1% -$103K
IRDM icon
377
Iridium Communications
IRDM
$4.99B
$9.46M 0.02%
172,503
-47,748
-22% -$2.04M
PRF icon
378
Invesco FTSE RAFI US 1000 ETF
PRF
$10B
$9.39M 0.02%
173,883
+20,135
+13% +$1.05M
MGK icon
379
Vanguard Morningstar Mega Cap Growth ETF
MGK
$33.2B
$9.38M 0.02%
106,666
-9,349
-8% -$798K
ET icon
380
Energy Transfer Partners
ET
$73.3B
$9.32M 0.02%
487,218
-59,841
-11% -$1.16M
CDNL
381
Cardinal Infrastructure Group
CDNL
$693M
$9.25M 0.02%
+98,193
New +$5.65M
CHWY icon
382
Chewy
CHWY
$8.53B
$9.24M 0.02%
470,371
-136,394
-22% -$3.1M
VRTX icon
383
Vertex Pharmaceuticals
VRTX
$130B
$9.14M 0.02%
18,400
+1,859
+11% +$824K
NUE icon
384
Nucor
NUE
$58.6B
$9.1M 0.02%
40,848
-27
-0.1% -$6.11K
BNY
385
Bank of New York Mellon
BNY
$105B
$9.08M 0.02%
62,802
+22,311
+55% +$3.05M
PJUN icon
386
Innovator US Equity Power Buffer ETF June
PJUN
$875M
$9.07M 0.02%
209,877
+119,414
+132% +$5.14M
NOC icon
387
Northrop Grumman
NOC
$76.1B
$9.03M 0.02%
17,726
-859
-5% -$495K
RF icon
388
Regions Financial
RF
$25.4B
$8.94M 0.02%
295,952
-4,797
-2% -$135K
HEFA icon
389
iShares Currency Hedged MSCI EAFE ETF
HEFA
$7.42B
$8.93M 0.02%
190,399
-21,290
-10% -$958K
EVR icon
390
Evercore
EVR
$10.3B
$8.87M 0.02%
25,986
+829
+3% +$284K
SOFI icon
391
SoFi Technologies
SOFI
$22.3B
$8.84M 0.02%
493,064
+87,305
+22% +$1.48M
USB icon
392
US Bancorp
USB
$97.1B
$8.77M 0.02%
145,164
-4,003
-3% -$224K
YETI icon
393
Yeti Holdings
YETI
$2.89B
$8.74M 0.02%
176,381
-10,041
-5% -$435K
NBIX icon
394
Neurocrine Biosciences
NBIX
$15.2B
$8.68M 0.02%
51,511
+47,566
+1,206% +$7.06M
SOXX icon
395
iShares Semiconductor ETF
SOXX
$42.5B
$8.67M 0.02%
13,523
-14,851
-52% -$7.54M
BN icon
396
Brookfield
BN
$82.9B
$8.62M 0.02%
202,453
+4,079
+2% +$182K
OMC icon
397
Omnicom Group
OMC
$22.2B
$8.61M 0.02%
118,244
+45
+0% +$3.39K
CGUS icon
398
Capital Group Core Equity ETF
CGUS
$11.6B
$8.57M 0.02%
192,751
+23,448
+14% +$1M
COWZ icon
399
Pacer US Cash Cows 100 ETF
COWZ
$19.8B
$8.57M 0.02%
137,765
-6,459
-4% -$408K
FTV icon
400
Fortive
FTV
$17.1B
$8.56M 0.02%
140,181
-11,974
-8% -$719K
14 15
16
17 18

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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.