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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
DCI icon
401
Donaldson
DCI
$10.1B
$8.46M 0.02%
94,285
-5,635
-6% -$485K
BABA icon
402
Alibaba
BABA
$273B
$8.44M 0.02%
87,910
+1,743
+2% +$218K
VLTO icon
403
Veralto
VLTO
$23.5B
$8.4M 0.02%
94,752
-9,000
-9% -$782K
URI icon
404
United Rentals
URI
$61.1B
$8.38M 0.02%
7,397
+229
+3% +$218K
SJM icon
405
J.M. Smucker
SJM
$12.8B
$8.34M 0.02%
74,150
-1,961
-3% -$200K
BJ icon
406
BJs Wholesale Club
BJ
$12B
$8.34M 0.02%
95,585
-92,713
-49% -$8.49M
MKC icon
407
McCormick & Company Non-Voting
MKC
$13.5B
$8.31M 0.02%
164,908
-5,892
-3% -$289K
BIV icon
408
Vanguard Intermediate-Term Bond ETF
BIV
$28.4B
$8.31M 0.02%
108,356
-1,082
-1% -$83.1K
ALAB icon
409
Astera Labs
ALAB
$44.6B
$8.28M 0.02%
17,145
+775
+5% +$206K
STRL icon
410
Sterling Infrastructure
STRL
$14.2B
$8.23M 0.02%
9,806
-343
-3% -$241K
SMG icon
411
ScottsMiracle-Gro
SMG
$3.28B
$8.18M 0.02%
120,151
-7,808
-6% -$484K
PCTY icon
412
Paylocity
PCTY
$7.84B
$8.18M 0.02%
78,249
+1,119
+1% +$119K
ARCC icon
413
Ares Capital
ARCC
$13.9B
$8.16M 0.02%
440,202
+3,526
+0.8% +$65.8K
TRV icon
414
Travelers Companies
TRV
$78.7B
$8.14M 0.02%
24,655
+1,139
+5% +$345K
STIP icon
415
iShares 0-5 Year TIPS Bond ETF
STIP
$16.3B
$8.09M 0.02%
79,189
-2,730
-3% -$282K
DGRO icon
416
iShares Core Dividend Growth ETF
DGRO
$42.7B
$8.05M 0.02%
106,210
+13,985
+15% +$1.03M
BROS icon
417
Dutch Bros
BROS
$5.83B
$7.99M 0.02%
111,286
-101,032
-48% -$5.8M
OEF icon
418
iShares S&P 100 ETF
OEF
$20.1B
$7.99M 0.02%
21,831
-100
-0.5% -$35.8K
VUSB icon
419
Vanguard Ultra-Short Bond ETF
VUSB
$10.2B
$7.87M 0.02%
158,180
-14,542
-8% -$723K
TTWO icon
420
Take-Two Interactive
TTWO
$40.2B
$7.83M 0.02%
31,318
-14,173
-31% -$3.13M
ELF icon
421
e.l.f. Beauty
ELF
$5.71B
$7.83M 0.02%
105,784
-42,557
-29% -$2.59M
T icon
422
AT&T
T
$183B
$7.77M 0.02%
375,495
-64,724
-15% -$1.61M
VIOO icon
423
Vanguard S&P Small-Cap 600 ETF
VIOO
$4.11B
$7.76M 0.02%
56,442
+20,625
+58% +$2.62M
BOTZ icon
424
Global X Robotics & Artificial Intelligence ETF
BOTZ
$3.46B
$7.68M 0.02%
202,343
+18,574
+10% +$707K
UCB
425
United Community Banks
UCB
$4.26B
$7.63M 0.02%
217,555
-293
-0.1% -$9.79K
15 16
17
18 19

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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.