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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
(-6.3%)
Cap. Flow
-$465K
Cap. Flow
% of AUM
-0%
Top 10 Holdings %
Top 10 Hldgs %
25.64%
Holding
2,019
New
132
Increased
799
Reduced
746
Closed
97
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco S&P 500 Equal Weight ETF
RSP
|
+$224M |
| 2 |
Vanguard FTSE All-World ex-US ETF
VEU
|
+$113M |
| 3 |
Quanta Services
PWR
|
+$75M |
| 4 |
SPDR Gold Trust
GLD
|
+$58.9M |
| 5 |
Boeing
BA
|
+$55.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Workday
WDAY
|
+$91.2M |
| 2 |
CWAN
Clearwater Analytics
CWAN
|
+$78M |
| 3 |
Applovin
APP
|
+$74.7M |
| 4 |
Tyler Technologies
TYL
|
+$69.1M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
1151
Scholar Rock
SRRK
$5.88B
| $506K | ﹤0.01% |
10,303
+294
| +3% | +$13.2K |
|
|
LINE
1152
Lineage Inc
LINE
$10.1B
| $506K | ﹤0.01% |
15,454
-2,828
| -15% | -$105K |
|
1153
JPMorgan Ultra-Short Municipal Income ETF
JMST
$7.12B
| $506K | ﹤0.01% |
9,919
+1,539
| +18% | +$78.6K |
|
1154
Ryanair
RYAAY
$30B
| $502K | ﹤0.01% |
+8,686
| New | +$573K |
|
1155
iShares MSCI Mexico ETF
EWW
$1.89B
| $502K | ﹤0.01% |
6,673
+5,000
| +299% | +$378K |
|
1156
State Street SPDR NYSE Technology ETF
XNTK
$1.94B
| $500K | ﹤0.01% |
1,960
| – | – |
|
1157
iShares US Industrials ETF
IYJ
$1.95B
| $499K | ﹤0.01% |
3,383
| – | – |
|
1158
State Street SPDR MSCI ACWI ex-US ETF
CWI
$2.7B
| $499K | ﹤0.01% |
13,631
+1,693
| +14% | +$63.8K |
|
1159
Steris
STE
$22.9B
| $498K | ﹤0.01% |
2,251
+583
| +35% | +$143K |
|
1160
Popular Inc
BPOP
$11B
| $496K | ﹤0.01% |
3,693
+6
| +0.2% | +$804 |
|
1161
iShares US Consumer Staples ETF
IYK
$1.44B
| $494K | ﹤0.01% |
7,053
-3
| -0% | -$216 |
|
|
SLDE
1162
Slide Insurance Holdings
SLDE
$2.54B
| $493K | ﹤0.01% |
27,385
| – | – |
|
|
MRP
1163
Millrose Properties Inc
MRP
$4.66B
| $491K | ﹤0.01% |
17,536
+3,520
| +25% | +$106K |
|
1164
Southwest Airlines
LUV
$21.7B
| $491K | ﹤0.01% |
13,061
+923
| +8% | +$41.7K |
|
1165
FirstCash
FCFS
$8.77B
| $487K | ﹤0.01% |
2,589
-3
| -0.1% | -$542 |
|
1166
Cheesecake Factory
CAKE
$5.03B
| $486K | ﹤0.01% |
8,883
-1,862
| -17% | -$111K |
|
|
CMTV
1167
Community BanCorp
CMTV
$229M
| $485K | ﹤0.01% |
+15,602
| New | +$526K |
|
1168
Jack Henry & Associates
JKHY
$11.4B
| $483K | ﹤0.01% |
3,058
+175
| +6% | +$30K |
|
|
BWIN
1169
Baldwin Insurance Group
BWIN
$2.75B
| $482K | ﹤0.01% |
21,954
-1,403
| -6% | -$30.3K |
|
1170
Portland General Electric
POR
$5.82B
| $478K | ﹤0.01% |
9,052
+1,779
| +24% | +$91.4K |
|
1171
BILL Holdings
BILL
$4.72B
| $476K | ﹤0.01% |
12,418
-260,324
| -95% | -$11.6M |
|
1172
Masco
MAS
$14.6B
| $474K | ﹤0.01% |
7,854
+1,521
| +24% | +$103K |
|
1173
First Trust Dow Jones Internet Index Fund ETF
FDN
$4.99B
| $473K | ﹤0.01% |
2,019
+936
| +86% | +$233K |
|
1174
Hayward Holdings
HAYW
$3.31B
| $471K | ﹤0.01% |
35,226
+5,907
| +20% | +$91.9K |
|
1175
Vanguard Mega Cap 300 Index ETF
MGC
$9.71B
| $469K | ﹤0.01% |
1,986
-777
| -28% | -$193K |
|
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SAM
VIA
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.