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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
COHR icon
526
Coherent
COHR
$56.8B
$4.9M 0.01%
12,424
+4,411
+55% +$1.56M
LEU icon
527
Centrus Energy
LEU
$2.84B
$4.89M 0.01%
29,140
+9,489
+48% +$1.77M
GBTC icon
528
Grayscale Bitcoin Trust
GBTC
$11.4B
$4.86M 0.01%
106,864
-215
-0.2% -$12K
XLU icon
529
State Street Utilities Select Sector SPDR ETF
XLU
$21.5B
$4.85M 0.01%
107,004
-35,618
-25% -$1.61M
DIVO icon
530
Amplify CWP Enhanced Dividend Income ETF
DIVO
$7.75B
$4.84M 0.01%
105,925
+4,586
+5% +$210K
IOT icon
531
Samsara
IOT
$23.8B
$4.82M 0.01%
148,771
-967
-0.6% -$29.9K
SCHG icon
532
Schwab US Large-Cap Growth ETF
SCHG
$62B
$4.77M 0.01%
140,828
-9,201
-6% -$305K
ITT icon
533
ITT
ITT
$17.4B
$4.76M 0.01%
24,073
-38
-0.2% -$7.68K
FSS icon
534
Federal Signal
FSS
$7.04B
$4.75M 0.01%
36,958
-5,901
-14% -$677K
IMCG icon
535
iShares Morningstar Mid-Cap Growth ETF
IMCG
$3.95B
$4.73M 0.01%
48,132
+5,838
+14% +$527K
O icon
536
Realty Income
O
$54.1B
$4.72M 0.01%
76,246
+5,087
+7% +$317K
KNSL icon
537
Kinsale Capital Group
KNSL
$8.22B
$4.71M 0.01%
14,293
-23,214
-62% -$7.47M
DXJ icon
538
WisdomTree Japan Hedged Equity Fund
DXJ
$7.1B
$4.71M 0.01%
27,142
-9,737
-26% -$1.64M
SPDW icon
539
State Street SPDR Portfolio Developed World ex-US ETF
SPDW
$41.3B
$4.69M 0.01%
93,163
+8,754
+10% +$434K
REGL icon
540
ProShares S&P MidCap 400 Dividend Aristocrats ETF
REGL
$1.71B
$4.68M 0.01%
51,132
+26,363
+106% +$2.36M
IP icon
541
International Paper
IP
$18B
$4.68M 0.01%
122,711
-423
-0.3% -$14.5K
VHT icon
542
Vanguard Health Care ETF
VHT
$19B
$4.68M 0.01%
15,636
+2,470
+19% +$687K
YUM icon
543
Yum! Brands
YUM
$37.6B
$4.63M 0.01%
28,950
-1,650
-5% -$256K
ROST icon
544
Ross Stores
ROST
$71.8B
$4.63M 0.01%
21,735
+1,510
+7% +$340K
NGNE icon
545
Neurogene
NGNE
$694M
$4.62M 0.01%
146,905
-21,313
-13% -$587K
DKS icon
546
Dick's Sporting Goods
DKS
$11B
$4.56M 0.01%
20,106
+3,204
+19% +$708K
TTEK icon
547
Tetra Tech
TTEK
$9.34B
$4.55M 0.01%
157,326
-1,116
-0.7% -$32.8K
LPLA icon
548
LPL Financial
LPLA
$26.2B
$4.49M 0.01%
15,924
-1,246
-7% -$374K
TSCO icon
549
Tractor Supply
TSCO
$17.1B
$4.48M 0.01%
141,625
-776
-0.5% -$26.8K
SHAK icon
550
Shake Shack
SHAK
$2.29B
$4.47M 0.01%
79,743
-17,832
-18% -$1.34M
20 21
22
23 24

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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.