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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
+665.86%
AUM
$38.4B
AUM Growth
+$3.49B
(+10%)
Cap. Flow
-$792M
Cap. Flow
% of AUM
-2.06%
Top 10 Holdings %
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 |
Arista Networks
ANET
|
+$71.2M |
| 3 |
Invesco S&P 500 Equal Weight ETF
RSP
|
+$61.8M |
| 4 |
Vanguard Morningstar Total Stock Market ETF
VTI
|
+$55.8M |
| 5 |
MIAX
Miami International Holdings
MIAX
|
+$49.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
ExxonMobil
XOM
|
+$161M |
| 2 |
Copart
CPRT
|
+$62M |
| 3 |
Danaher
DHR
|
+$59.1M |
| 4 |
Apple
AAPL
|
+$57M |
| 5 |
Veeva Systems
VEEV
|
+$52.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 24.43% |
| 2 | Industrials | 15.24% |
| 3 | Financials | 11.07% |
| 4 | Healthcare | 9.11% |
| 5 | Communication Services | 6.98% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
1
Apple
AAPL
$4.43T
| $1.66B | 4.32% |
5,731,525
-199,389
| -3% | -$57M |
|
2
Amazon
AMZN
$2.93T
| $1.4B | 3.65% |
5,875,124
-182,814
| -3% | -$45.9M |
|
3
Microsoft
MSFT
$3.73T
| $1.28B | 3.35% |
3,442,574
-55,536
| -2% | -$22.5M |
|
4
NVIDIA
NVDA
$5.25T
| $1.08B | 2.8% |
5,374,424
-53,451
| -1% | -$11M |
|
5
Alphabet (Google) Class C
GOOG
$4.22T
| $1.04B | 2.72% |
2,953,724
-82,041
| -3% | -$29.3M |
|
|
6
Alphabet (Google) Class A
GOOGL
$4.23T
| $859M | 2.24% |
2,402,621
-33,496
| -1% | -$12.1M |
|
7
GE Vernova
GEV
$268B
| $775M | 2.02% |
659,673
-4,930
| -0.7% | -$5.03M |
|
8
JPMorgan Chase
JPM
$964B
| $743M | 1.94% |
2,270,360
-36,893
| -2% | -$11.5M |
|
9
State Street SPDR S&P 500 ETF Trust
SPY
$807B
| $633M | 1.65% |
848,034
+2,740
| +0.3% | +$1.99M |
|
10
Visa
V
$678B
| $632M | 1.65% |
1,841,604
-2,979
| -0.2% | -$956K |
|
11
Costco
COST
$417B
| $491M | 1.28% |
524,692
+3,415
| +0.7% | +$3.4M |
|
12
Idexx Laboratories
IDXX
$46.6B
| $484M | 1.26% |
918,556
-27,780
| -3% | -$15.6M |
|
13
Amphenol
APH
$207B
| $442M | 1.15% |
2,504,409
-15,910
| -0.6% | -$2.29M |
|
14
Mastercard
MA
$494B
| $433M | 1.13% |
842,350
-81,055
| -9% | -$40.4M |
|
|
15
Invesco S&P 500 Equal Weight ETF
RSP
$99.4B
| $422M | 1.1% |
1,982,392
+301,788
| +18% | +$61.8M |
|
16
Palo Alto Networks
PANW
$312B
| $418M | 1.09% |
1,226,519
-78,339
| -6% | -$17.9M |
|
17
Eli Lilly
LLY
$1.09T
| $416M | 1.08% |
347,098
+23,080
| +7% | +$23.6M |
|
18
Meta Platforms (Facebook)
META
$1.54T
| $378M | 0.98% |
670,881
-50,839
| -7% | -$31.1M |
|
19
Vanguard FTSE All-World ex-US ETF
VEU
$69.9B
| $375M | 0.98% |
4,479,218
+310,593
| +7% | +$25.4M |
|
20
Micron Technology
MU
$969B
| $365M | 0.95% |
315,878
-16,433
| -5% | -$12.3M |
|
21
iShares Core S&P 500 ETF
IVV
$901B
| $363M | 0.95% |
484,704
-1,135
| -0.2% | -$827K |
|
22
Fastenal
FAST
$60.3B
| $356M | 0.93% |
7,407,059
+33,352
| +0.5% | +$1.51M |
|
23
Broadcom
AVGO
$1.97T
| $351M | 0.91% |
929,716
+11,388
| +1% | +$4.57M |
|
24
AbbVie
ABBV
$443B
| $324M | 0.84% |
1,287,857
-46,252
| -3% | -$9.95M |
|
25
Vanguard FTSE Developed Markets ETF
VEA
$236B
| $306M | 0.8% |
4,291,023
+428,937
| +11% | +$29.9M |
|
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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 Industrials and Financials.
- 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.