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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
EZU icon
1251
iShare MSCI Eurozone ETF
EZU
$9.38B
$371K ﹤0.01%
5,923
+1,228
+26% +$80.4K
CDW icon
1252
CDW
CDW
$18.9B
$371K ﹤0.01%
3,064
+102
+3% +$12.9K
THRY icon
1253
Thryv Holdings
THRY
$184M
$369K ﹤0.01%
134,693
-96,608
-42% -$380K
HUBG icon
1254
HUB Group
HUBG
$2.92B
$369K ﹤0.01%
10,227
-2,978
-23% -$126K
UNM icon
1255
Unum
UNM
$13.2B
$368K ﹤0.01%
5,038
-13
-0.3% -$970
EMB icon
1256
iShares JPMorgan USD Emerging Markets Bond ETF
EMB
$14.9B
$364K ﹤0.01%
3,874
+33
+0.9% +$3.17K
APLD icon
1257
Applied Digital
APLD
$6.68B
$361K ﹤0.01%
15,205
-1,654
-10% -$51.8K
OLN icon
1258
Olin
OLN
$2.53B
$361K ﹤0.01%
+12,141
New +$297K
IONQ icon
1259
IonQ
IONQ
$11.9B
$361K ﹤0.01%
12,517
+149
+1% +$5.72K
APPN icon
1260
Appian
APPN
$2.11B
$360K ﹤0.01%
14,949
+151
+1% +$4.1K
MNST icon
1261
Monster Beverage
MNST
$95.1B
$360K ﹤0.01%
4,967
-13,500
-73% -$1.06M
FHN icon
1262
First Horizon
FHN
$12.2B
$360K ﹤0.01%
15,807
+967
+7% +$23.1K
ABM icon
1263
ABM Industries
ABM
$2.89B
$359K ﹤0.01%
9,315
+1,048
+13% +$45.3K
DLTH icon
1264
Duluth Holdings
DLTH
$152M
$359K ﹤0.01%
113,510
– –
BBCP icon
1265
Concrete Pumping Holdings
BBCP
$491M
$358K ﹤0.01%
50,073
+73
+0.1% +$486
ODC icon
1266
Oil-Dri
ODC
$1.43B
$357K ﹤0.01%
5,486
+6
+0.1% +$365
IFF icon
1267
International Flavors & Fragrances
IFF
$20.3B
$354K ﹤0.01%
4,885
+104
+2% +$7.63K
VNQI icon
1268
Vanguard Global ex-US Real Estate ETF
VNQI
$3.51B
$353K ﹤0.01%
7,942
-246
-3% -$11.7K
IWX icon
1269
iShares Russell Top 200 Value ETF
IWX
$3.92B
$353K ﹤0.01%
3,808
+265
+7% +$25.2K
FSLY icon
1270
Fastly Inc
FSLY
$3.24B
$352K ﹤0.01%
+12,119
New +$199K
OII icon
1271
Oceaneering
OII
$4.64B
$352K ﹤0.01%
9,910
-20
-0.2% -$647
CINF icon
1272
Cincinnati Financial
CINF
$27.8B
$349K ﹤0.01%
2,220
+209
+10% +$34K
MORN icon
1273
Morningstar
MORN
$7.55B
$349K ﹤0.01%
2,063
-321
-13% -$59.6K
FXF icon
1274
Invesco CurrencyShares Swiss Franc Trust
FXF
$411M
$349K ﹤0.01%
+3,159
New +$356K
WLDN icon
1275
Willdan Group
WLDN
$1.02B
$348K ﹤0.01%
4,550
+1,300
+40% +$138K
49 50
51
52 53

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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.