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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
DFAT icon
1326
Dimensional US Targeted Value ETF
DFAT
$14.7B
$308K ﹤0.01%
4,932
-110
-2% -$6.99K
CTRE icon
1327
CareTrust REIT
CTRE
$10B
$306K ﹤0.01%
8,345
– –
FORM icon
1328
FormFactor
FORM
$6.51B
$305K ﹤0.01%
+3,144
New +$271K
SYBT icon
1329
Stock Yards Bancorp
SYBT
$2.6B
$304K ﹤0.01%
+4,585
New +$305K
FTS icon
1330
Fortis
FTS
$29.3B
$304K ﹤0.01%
5,443
– –
CQP icon
1331
Cheniere Energy
CQP
$30.5B
$303K ﹤0.01%
4,689
+89
+2% +$5.32K
EUFN icon
1332
iShares MSCI Europe Financials ETF
EUFN
$4B
$301K ﹤0.01%
8,637
+279
+3% +$10.2K
ITIC
1333
Investors Title Co
ITIC
$560M
$301K ﹤0.01%
1,384
– –
VFC icon
1334
VF Corp
VFC
$5.92B
$301K ﹤0.01%
17,693
+1,445
+9% +$27.2K
CCEP icon
1335
Coca-Cola Europacific Partners
CCEP
$49.1B
$300K ﹤0.01%
3,314
-60
-2% -$5.76K
MRTN icon
1336
Marten Transport
MRTN
$1.22B
$299K ﹤0.01%
22,800
– –
TM icon
1337
Toyota
TM
$228B
$299K ﹤0.01%
1,452
+19
+1% +$4.29K
FLUT icon
1338
Flutter Entertainment
FLUT
$18.7B
$299K ﹤0.01%
+2,934
New +$423K
OGS icon
1339
ONE Gas
OGS
$5.01B
$299K ﹤0.01%
3,471
+385
+12% +$31.9K
IBKR icon
1340
Interactive Brokers
IBKR
$38.4B
$298K ﹤0.01%
4,449
+193
+5% +$13.8K
G icon
1341
Genpact
G
$6.22B
$298K ﹤0.01%
7,989
+255
+3% +$10.5K
FLY
1342
Firefly Aerospace
FLY
$2.93B
$298K ﹤0.01%
+10,450
New +$254K
TLH icon
1343
iShares 10-20 Year Treasury Bond ETF
TLH
$11B
$297K ﹤0.01%
2,951
+2,206
+296% +$225K
LW icon
1344
Lamb Weston
LW
$7.42B
$295K ﹤0.01%
6,977
+271
+4% +$12.1K
VIA
1345
Via Transportation Inc
VIA
$1.68B
$295K ﹤0.01%
19,649
+9,033
+85% +$180K
E icon
1346
ENI
E
$78.1B
$294K ﹤0.01%
+5,200
New +$233K
PFG icon
1347
Principal Financial Group
PFG
$24.3B
$293K ﹤0.01%
3,248
+658
+25% +$60.1K
SCHC icon
1348
Schwab International Small-Cap Equity ETF
SCHC
$5.28B
$292K ﹤0.01%
6,240
– –
FUSB icon
1349
First US Bancshares
FUSB
$91.9M
$291K ﹤0.01%
19,000
– –
EAGG icon
1350
iShares ESG Aware US Aggregate Bond ETF
EAGG
$4.97B
$291K ﹤0.01%
6,111
+4,215
+222% +$202K
52 53
54
55 56

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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.