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William Blair & Company

William Blair & Company Portfolio holdings

AUM $34.9B
1-Year Est. Return 18.88%
This Fund
S&P 500
This Quarter Est. Return
-3.16%
1 Year Est. Return
+18.88%
3 Year Est. Return
+73.84%
5 Year Est. Return
+90.13%
10 Year Est. Return
+512.03%
AUM
$34.9B
AUM Growth
-$2.36B
Cap. Flow
-$465K
Cap. Flow %
-0%
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97

Top Buys

Rank Stock Value
1
RSP icon
Invesco S&P 500 Equal Weight ETF
RSP
+$224M
2
VEU icon
Vanguard FTSE All-World ex-US ETF
VEU
+$113M
3
PWR icon
Quanta Services
PWR
+$75M
4
GLD icon
SPDR Gold Trust
GLD
+$58.9M
5
BA icon
Boeing
BA
+$55.5M

Top Sells

Rank Stock Value
1
WDAY icon
Workday
WDAY
+$91.2M
2
CWAN
Clearwater Analytics
CWAN
+$78M
3
APP icon
Applovin
APP
+$74.7M
4
TYL icon
Tyler Technologies
TYL
+$69.1M
5
UBER icon
Uber
UBER
+$62.2M

Sector Composition

Rank Sector Weight
1 Technology 21.79%
2 Industrials 14.2%
3 Financials 12.26%
4 Healthcare 10.59%
5 Consumer Discretionary 7.17%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ICE icon
26
Intercontinental Exchange
ICE
$82.4B
$251M 0.72%
1,593,628
-96,938
-6% -$15.8M
HD icon
27
Home Depot
HD
$332B
$250M 0.72%
761,419
+5,237
+0.7% +$1.91M
VEA icon
28
Vanguard FTSE Developed Markets ETF
VEA
$226B
$247M 0.71%
3,862,086
+713,555
+23% +$47.1M
DHR icon
29
Danaher
DHR
$135B
$246M 0.7%
1,296,804
-75,820
-6% -$16.1M
PGR icon
30
Progressive
PGR
$124B
$242M 0.69%
1,219,749
-187,283
-13% -$38.7M
VOO icon
31
Vanguard S&P 500 ETF
VOO
$968B
$237M 0.68%
397,380
+22,150
+6% +$13.9M
BRK.B icon
32
Berkshire Hathaway Class B
BRK.B
$1.07T
$237M 0.68%
495,322
+48,260
+11% +$23.7M
UBER icon
33
Uber
UBER
$134B
$237M 0.68%
3,299,596
-807,962
-20% -$62.2M
JNJ icon
34
Johnson & Johnson
JNJ
$635B
$234M 0.67%
955,632
+6,057
+0.6% +$1.41M
ECL icon
35
Ecolab
ECL
$75.6B
$230M 0.66%
866,411
+8,540
+1% +$2.41M
VTV icon
36
Vanguard Value ETF
VTV
$189B
$229M 0.66%
1,165,912
+267,888
+30% +$53.6M
WSO icon
37
Watsco Inc
WSO
$14.9B
$212M 0.61%
582,700
-92,740
-14% -$35.9M
AXP icon
38
American Express
AXP
$223B
$210M 0.6%
693,767
-6,280
-0.9% -$2.11M
PANW icon
39
Palo Alto Networks
PANW
$264B
$209M 0.6%
1,304,858
+54,486
+4% +$9.15M
ISRG icon
40
Intuitive Surgical
ISRG
$121B
$196M 0.56%
425,228
-14,142
-3% -$7.15M
TDG icon
41
TransDigm Group
TDG
$69.2B
$193M 0.55%
166,248
-3,982
-2% -$5.22M
NOW icon
42
ServiceNow
NOW
$102B
$188M 0.54%
1,800,988
-413,852
-19% -$48.7M
VEEV icon
43
Veeva Systems
VEEV
$30.3B
$188M 0.54%
1,067,576
-161,002
-13% -$31.6M
BA icon
44
Boeing
BA
$165B
$184M 0.53%
922,102
+243,515
+36% +$55.5M
QQQ icon
45
Invesco QQQ Trust
QQQ
$455B
$180M 0.51%
311,016
+29,716
+11% +$18.1M
P
46
Everpure Inc
P
$24.8B
$172M 0.49%
2,918,046
-135,576
-4% -$9.18M
NFLX icon
47
Netflix
NFLX
$292B
$170M 0.49%
1,763,451
+267,756
+18% +$23.6M
GLD icon
48
SPDR Gold Trust
GLD
$131B
$166M 0.48%
386,735
+131,532
+52% +$58.9M
CTAS icon
49
Cintas
CTAS
$82.4B
$165M 0.47%
973,553
-21,464
-2% -$4.12M
XOM icon
50
ExxonMobil
XOM
$651B
$161M 0.46%
946,386
-21,751
-2% -$3.17M
1
2
3 4 5

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William Blair & Company's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair & Company held 2,019 positions worth $34.9B, down 6.3% from $37.3B the previous quarter. Its ten largest holdings account for 26% of the portfolio.

William Blair & Company's Q1 2026 filing shows 132 new, 799 increased, 746 reduced and 97 closed positions. Its largest new stake was Silicon Motion: 103,179 shares worth $11.6M. The largest sale was Workday, an estimated $91.2M.

By sector, the portfolio is most concentrated in Technology at 22% of assets, down from 26% a quarter earlier, followed by Industrials and Financials.

  • William Blair & Company's largest Q1 2026 buy was Silicon Motion: 103,179 shares worth $11.6M.
  • William Blair & Company added most to Invesco S&P 500 Equal Weight ETF in Q1 2026, an estimated $224M increase.
  • William Blair & Company's biggest Q1 2026 reduction was Workday, cutting an estimated $91.2M.
  • William Blair & Company fully exited Dynavax Technologies in Q1 2026, selling an estimated $27.4M.
  • William Blair & Company's ten largest holdings make up 26% of its $34.9B portfolio in Q1 2026.
  • William Blair & Company opened 132 new positions and closed 97 in Q1 2026.
  • William Blair & Company's portfolio value fell 6.3% quarter-over-quarter to $34.9B.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.