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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
VTEB icon
601
Vanguard Tax-Exempt Bond Index Fund
VTEB
$45.2B
$3.7M 0.01%
73,067
-975
-1% -$49K
WAT icon
602
Waters Corp
WAT
$41.1B
$3.67M 0.01%
9,795
-409
-4% -$140K
AFRM icon
603
Affirm
AFRM
$24.2B
$3.67M 0.01%
45,008
-11,190
-20% -$731K
SCHA icon
604
Schwab U.S Small- Cap ETF
SCHA
$21.9B
$3.66M 0.01%
101,437
+23,889
+31% +$789K
RY icon
605
Royal Bank of Canada
RY
$280B
$3.59M 0.01%
17,360
-88
-0.5% -$16.3K
AIOT
606
PowerFleet Inc
AIOT
$407M
$3.59M 0.01%
936,327
+955
+0.1% +$3.35K
AKAM icon
607
Akamai
AKAM
$15B
$3.58M 0.01%
30,303
+673
+2% +$83.8K
ALNY icon
608
Alnylam Pharmaceuticals
ALNY
$32B
$3.57M 0.01%
11,853
+2,423
+26% +$731K
PDP icon
609
Invesco Dorsey Wright Momentum ETF
PDP
$1.41B
$3.56M 0.01%
23,485
+70
+0.3% +$9.75K
LFUS icon
610
Littelfuse
LFUS
$10.1B
$3.53M 0.01%
7,753
-848
-10% -$367K
ONT
611
Onterris Inc
ONT
$616M
$3.5M 0.01%
173,037
-93,943
-35% -$1.75M
OPRX icon
612
OptimizeRx
OPRX
$142M
$3.48M 0.01%
607,925
-7,067
-1% -$40.6K
ENS icon
613
EnerSys
ENS
$6.2B
$3.46M 0.01%
14,804
+7,343
+98% +$1.59M
MTUM icon
614
iShares MSCI USA Momentum Factor ETF
MTUM
$24.1B
$3.46M 0.01%
10,091
+1,067
+12% +$318K
LH icon
615
Labcorp
LH
$26.3B
$3.46M 0.01%
12,347
+234
+2% +$61.5K
GRID
616
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$11.6B
$3.41M 0.01%
17,800
+10,420
+141% +$1.96M
SCHO icon
617
Schwab Short-Term US Treasury ETF
SCHO
$15.2B
$3.37M 0.01%
139,784
+18,897
+16% +$457K
DD icon
618
DuPont de Nemours
DD
$17.2B
$3.37M 0.01%
24,846
-405
-2% -$57.5K
SNY icon
619
Sanofi
SNY
$102B
$3.36M 0.01%
78,850
+35,257
+81% +$1.58M
BIIB icon
620
Biogen
BIIB
$31.9B
$3.36M 0.01%
15,539
+2,685
+21% +$514K
CAVA icon
621
CAVA Group
CAVA
$5.81B
$3.35M 0.01%
42,680
+6,255
+17% +$524K
CRWV
622
CoreWeave
CRWV
$46B
$3.33M 0.01%
33,483
+12,327
+58% +$1.33M
TOL icon
623
Toll Brothers
TOL
$12.2B
$3.33M 0.01%
20,224
+4,867
+32% +$692K
ENVX icon
624
Enovix
ENVX
$641M
$3.33M 0.01%
548,779
-5,455
-1% -$36.2K
XLY icon
625
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21B
$3.3M 0.01%
28,149
-11,171
-28% -$1.3M
23 24
25
26 27

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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.