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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
-3.16%
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
$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 | |
|---|---|---|---|---|---|---|
1251
iShare MSCI Eurozone ETF
EZU
$9.96B
| $371K | ﹤0.01% |
5,923
+1,228
| +26% | +$80.4K |
|
1252
CDW
CDW
$17.4B
| $371K | ﹤0.01% |
3,064
+102
| +3% | +$12.9K |
|
1253
Thryv Holdings
THRY
$95.5M
| $369K | ﹤0.01% |
134,693
-96,608
| -42% | -$380K |
|
1254
HUB Group
HUBG
$2.58B
| $369K | ﹤0.01% |
10,227
-2,978
| -23% | -$126K |
|
1255
Unum
UNM
$14.7B
| $368K | ﹤0.01% |
5,038
-13
| -0.3% | -$970 |
|
1256
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$15B
| $364K | ﹤0.01% |
3,874
+33
| +0.9% | +$3.17K |
|
1257
Applied Digital
APLD
$8.84B
| $361K | ﹤0.01% |
15,205
-1,654
| -10% | -$51.8K |
|
1258
Olin
OLN
$2.17B
| $361K | ﹤0.01% |
+12,141
| New | +$297K |
|
1259
IonQ
IONQ
$18.6B
| $361K | ﹤0.01% |
12,517
+149
| +1% | +$5.72K |
|
1260
Appian
APPN
$2.53B
| $360K | ﹤0.01% |
14,949
+151
| +1% | +$4.1K |
|
1261
Monster Beverage
MNST
$91.6B
| $360K | ﹤0.01% |
9,934
-27,000
| -73% | -$1.06M |
|
1262
First Horizon
FHN
$12.3B
| $360K | ﹤0.01% |
15,807
+967
| +7% | +$23.1K |
|
1263
ABM Industries
ABM
$2.82B
| $359K | ﹤0.01% |
9,315
+1,048
| +13% | +$45.3K |
|
1264
Duluth Holdings
DLTH
$152M
| $359K | ﹤0.01% |
113,510
| – | – |
|
1265
Concrete Pumping Holdings
BBCP
$480M
| $358K | ﹤0.01% |
50,073
+73
| +0.1% | +$486 |
|
1266
Oil-Dri
ODC
$1.27B
| $357K | ﹤0.01% |
5,486
+6
| +0.1% | +$365 |
|
1267
International Flavors & Fragrances
IFF
$21.5B
| $354K | ﹤0.01% |
4,885
+104
| +2% | +$7.63K |
|
1268
Vanguard Global ex-US Real Estate ETF
VNQI
$3.53B
| $353K | ﹤0.01% |
7,942
-246
| -3% | -$11.7K |
|
1269
iShares Russell Top 200 Value ETF
IWX
$4.04B
| $353K | ﹤0.01% |
3,808
+265
| +7% | +$25.2K |
|
1270
Fastly Inc
FSLY
$4.63B
| $352K | ﹤0.01% |
+12,119
| New | +$199K |
|
1271
Oceaneering
OII
$5.13B
| $352K | ﹤0.01% |
9,910
-20
| -0.2% | -$647 |
|
1272
Cincinnati Financial
CINF
$26.5B
| $349K | ﹤0.01% |
2,220
+209
| +10% | +$34K |
|
1273
Morningstar
MORN
$7.59B
| $349K | ﹤0.01% |
2,063
-321
| -13% | -$59.6K |
|
1274
Invesco CurrencyShares Swiss Franc Trust
FXF
$395M
| $349K | ﹤0.01% |
+3,159
| New | +$356K |
|
1275
Willdan Group
WLDN
$1.29B
| $348K | ﹤0.01% |
4,550
+1,300
| +40% | +$138K |
|
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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.