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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
EWJ icon
526
iShares MSCI Japan ETF
EWJ
$21.2B
$4.46M 0.01%
52,782
-4,911
-9% -$425K
CVS icon
527
CVS Health
CVS
$135B
$4.43M 0.01%
61,734
-3,684
-6% -$284K
CBZ icon
528
CBIZ
CBZ
$2.95B
$4.42M 0.01%
164,674
+15,318
+10% +$540K
IP icon
529
International Paper
IP
$22.6B
$4.4M 0.01%
123,134
+1,233
+1% +$51.2K
ROST icon
530
Ross Stores
ROST
$80.8B
$4.38M 0.01%
20,225
-97
-0.5% -$19.3K
BE icon
531
Bloom Energy
BE
$46.6B
$4.38M 0.01%
32,332
+1,429
+5% +$210K
SCHG icon
532
Schwab US Large-Cap Growth ETF
SCHG
$58.2B
$4.37M 0.01%
150,029
+2,565
+2% +$79.7K
CORZ icon
533
Core Scientific
CORZ
$5.79B
$4.37M 0.01%
292,069
– –
BDX icon
534
Becton Dickinson
BDX
$46.4B
$4.36M 0.01%
27,714
+658
+2% +$121K
O icon
535
Realty Income
O
$61.1B
$4.35M 0.01%
71,159
+7,787
+12% +$487K
ROKU icon
536
Roku
ROKU
$21.6B
$4.31M 0.01%
45,584
-4,864
-10% -$474K
DLR icon
537
Digital Realty Trust
DLR
$69.6B
$4.29M 0.01%
23,808
+291
+1% +$49.7K
XLY icon
538
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21.7B
$4.29M 0.01%
39,320
-645
-2% -$75.4K
HYG icon
539
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
$15.9B
$4.27M 0.01%
53,623
-514
-0.9% -$41.3K
SNDK
540
Sandisk
SNDK
$150B
$4.26M 0.01%
6,699
+1,412
+27% +$798K
FVD icon
541
First Trust Value Line Dividend Fund
FVD
$8.44B
$4.18M 0.01%
88,861
-59,665
-40% -$2.87M
KGS icon
542
Kodiak Gas Services
KGS
$5.55B
$4.15M 0.01%
71,108
+55,873
+367% +$2.71M
WSM icon
543
Williams-Sonoma
WSM
$27.5B
$4.14M 0.01%
22,714
-222
-1% -$44.3K
STRL icon
544
Sterling Infrastructure
STRL
$15.2B
$4.13M 0.01%
10,149
-511
-5% -$200K
SPIB icon
545
State Street SPDR Portfolio Intermediate Term Corporate Bond ETF
SPIB
$11.5B
$4.12M 0.01%
122,969
+1,870
+2% +$63.2K
VIOO icon
546
Vanguard S&P Small-Cap 600 ETF
VIOO
$4.12B
$4.11M 0.01%
35,817
+25,298
+240% +$2.97M
Q
547
Qnity Electronics Inc
Q
$25.8B
$4.11M 0.01%
35,587
-1,198
-3% -$127K
CACC icon
548
Credit Acceptance
CACC
$5.82B
$4.09M 0.01%
9,670
+4
+0% +$1.89K
IBN icon
549
ICICI Bank
IBN
$107B
$4.06M 0.01%
156,828
-1,499
-0.9% -$44K
DOW icon
550
Dow Inc
DOW
$22B
$4.04M 0.01%
97,108
-1,992
-2% -$63.2K
20 21
22
23 24

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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.