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William Blair & Company

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
+606.62%
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 Miscellaneous 17.51%
3 Industrials 14.2%
4 Financials 12.26%
5 Healthcare 10.59%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
ACM icon
1901
Aecom
ACM
$7.84B
– –
-5,153
Closed -$491K
AGI icon
1902
Alamos Gold
AGI
$14.4B
– –
-5,651
Closed -$218K
AMCR icon
1903
Amcor
AMCR
$19.7B
– –
-2,850
Closed -$119K
ANF icon
1904
Abercrombie & Fitch
ANF
$5.76B
– –
-2,101
Closed -$264K
BAP icon
1905
Credicorp
BAP
$30.7B
– –
-796
Closed -$228K
BCS icon
1906
Barclays
BCS
$83B
– –
-17,158
Closed -$437K
BIZD icon
1907
VanEck BDC Income ETF
BIZD
$1.57B
– –
-1,188
Closed -$16.8K
BMRC icon
1908
Bank of Marin Bancorp
BMRC
$452M
– –
-7,828
Closed -$204K
BRO icon
1909
Brown & Brown
BRO
$20.4B
– –
-23,545
Closed -$1.88M
BRSP
1910
BrightSpire Capital
BRSP
$517M
– –
-370,564
Closed -$2.08M
BZFD icon
1911
BuzzFeed
BZFD
$86.7M
– –
-17,000
Closed -$15.8K
CFLT
1912
DELISTED
Confluent
CFLT
– –
-159,290
Closed -$4.82M
CHRS icon
1913
Coherus Oncology
CHRS
$175M
– –
-19,000
Closed -$27K
CMA
1914
DELISTED
Comerica
CMA
– –
-2,790
Closed -$243K
CMBM
1915
DELISTED
Cambium Networks
CMBM
– –
-10,000
Closed -$14.4K
COOK icon
1916
Traeger
COOK
$130M
– –
-1,854
Closed -$100K
CRK icon
1917
Comstock Resources
CRK
$3.85B
– –
-40,572
Closed -$940K
CSGS
1918
DELISTED
CSG Systems International
CSGS
– –
-4,571
Closed -$351K
CVLT icon
1919
Commault Systems
CVLT
$6.03B
– –
-1,856
Closed -$233K
CWEN icon
1920
Clearway Energy Class C
CWEN
$6.11B
– –
-23,820
Closed -$792K
CWEN.A
1921
DELISTED
Clearway Energy Class A
CWEN.A
– –
-70
Closed -$2.2K
CYBR
1922
DELISTED
CyberArk
CYBR
– –
-32,592
Closed -$14.5M
DFNM icon
1923
Dimensional National Municipal Bond ETF
DFNM
$2.22B
– –
-131
Closed -$6.31K
DJD icon
1924
Invesco Dow Jones Industrial Average Dividend ETF
DJD
$498M
– –
-477
Closed -$27.3K
DSGR icon
1925
Distribution Solutions Group
DSGR
$1.62B
– –
-112,870
Closed -$3.09M
75 76
77
78 79

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TWC
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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 Miscellaneous and Industrials.

  • 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.