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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
HLT icon
1226
Hilton Worldwide
HLT
$72.1B
$400K ﹤0.01%
1,317
+298
+29% +$90.3K
BDSX icon
1227
Biodesix
BDSX
$220M
$400K ﹤0.01%
+27,583
New +$342K
GEF icon
1228
Greif
GEF
$4.92B
$400K ﹤0.01%
5,960
+56
+0.9% +$3.97K
EMN icon
1229
Eastman Chemical
EMN
$8B
$399K ﹤0.01%
5,229
+205
+4% +$14.8K
WES icon
1230
Western Midstream Partners
WES
$19.2B
$399K ﹤0.01%
9,684
+94
+1% +$3.89K
CTSH icon
1231
Cognizant
CTSH
$24.9B
$398K ﹤0.01%
6,487
+223
+4% +$16K
RJF icon
1232
Raymond James Financial
RJF
$33.8B
$395K ﹤0.01%
2,730
-158
-5% -$25.1K
SM icon
1233
SM Energy
SM
$7.8B
$395K ﹤0.01%
12,665
-164
-1% -$3.74K
MTX icon
1234
Minerals Technologies
MTX
$2.36B
$393K ﹤0.01%
5,536
+106
+2% +$7.29K
BL icon
1235
BlackLine
BL
$1.84B
$391K ﹤0.01%
10,573
-74,450
-88% -$3.21M
DKNG icon
1236
DraftKings
DKNG
$11.6B
$388K ﹤0.01%
17,967
-6,845
-28% -$185K
RIVN icon
1237
Rivian
RIVN
$22B
$388K ﹤0.01%
25,749
-3,587
-12% -$57.3K
IYC icon
1238
iShares US Consumer Discretionary ETF
IYC
$1.17B
$385K ﹤0.01%
3,977
+3
+0.1% +$306
PRVA icon
1239
Privia Health
PRVA
$2.98B
$385K ﹤0.01%
18,722
-1,277
-6% -$28.8K
FDS icon
1240
Factset
FDS
$9.36B
$383K ﹤0.01%
1,766
-1,444
-45% -$337K
TDVG icon
1241
T. Rowe Price Dividend Growth ETF
TDVG
$1.42B
$383K ﹤0.01%
8,572
+23
+0.3% +$1.05K
TWI icon
1242
Titan International
TWI
$466M
$381K ﹤0.01%
55,128
+28
+0.1% +$252
AA icon
1243
Alcoa
AA
$11.9B
$380K ﹤0.01%
5,729
+1,123
+24% +$68.9K
VCR icon
1244
Vanguard Consumer Discretionary ETF
VCR
$6.15B
$379K ﹤0.01%
1,057
-232
-18% -$89.5K
LNC icon
1245
Lincoln National
LNC
$8.73B
$374K ﹤0.01%
10,549
+244
+2% +$9.38K
MRNA icon
1246
Moderna
MRNA
$21.8B
$373K ﹤0.01%
7,338
+392
+6% +$18.3K
EES icon
1247
WisdomTree US SmallCap Earnings Fund
EES
$719M
$373K ﹤0.01%
6,419
– –
EPAC icon
1248
Enerpac Tool Group
EPAC
$1.83B
$372K ﹤0.01%
10,197
+37
+0.4% +$1.47K
ACGL icon
1249
Arch Capital
ACGL
$34.3B
$372K ﹤0.01%
3,872
-648
-14% -$62K
MAGS icon
1250
Listed Funds Trust Roundhill Magnificent Seven ETF
MAGS
$3.98B
$371K ﹤0.01%
+6,409
New +$401K
48 49
50
51 52

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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.