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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
IVOG icon
826
Vanguard S&P Mid-Cap 400 Growth ETF
IVOG
$1.6B
$1.48M ﹤0.01%
11,849
-4,006
-25% -$511K
RKT icon
827
Rocket Companies
RKT
$38.8B
$1.48M ﹤0.01%
103,715
+34,726
+50% +$632K
WBD icon
828
Warner Bros
WBD
$64.3B
$1.47M ﹤0.01%
53,433
-1,218
-2% -$34.1K
PCYO icon
829
Pure Cycle
PCYO
$255M
$1.46M ﹤0.01%
145,276
-6,916
-5% -$74.9K
OSIS icon
830
OSI Systems
OSIS
$3.53B
$1.46M ﹤0.01%
5,493
+32
+0.6% +$8.85K
FTEC icon
831
Fidelity MSCI Information Technology Index ETF
FTEC
$18.9B
$1.45M ﹤0.01%
6,985
+1,925
+38% +$423K
QDEF icon
832
FlexShares Quality Dividend Defensive Index Fund
QDEF
$545M
$1.45M ﹤0.01%
18,167
-228
-1% -$18.7K
APA icon
833
APA Corp
APA
$13B
$1.44M ﹤0.01%
33,856
+6,699
+25% +$203K
XLB icon
834
State Street Materials Select Sector SPDR ETF
XLB
$8.72B
$1.42M ﹤0.01%
28,446
+2,200
+8% +$110K
COO icon
835
Cooper Companies
COO
$14.2B
$1.42M ﹤0.01%
19,865
+275
+1% +$21.8K
PSLV icon
836
Sprott Physical Silver Trust
PSLV
$11.8B
$1.42M ﹤0.01%
58,203
-3,188
-5% -$87K
TEAM icon
837
Atlassian
TEAM
$26.5B
$1.41M ﹤0.01%
20,730
-18,077
-47% -$1.78M
FLOT icon
838
iShares Floating Rate Bond ETF
FLOT
$10.2B
$1.41M ﹤0.01%
27,741
-303
-1% -$15.4K
XLP icon
839
State Street Consumer Staples Select Sector SPDR ETF
XLP
$14.6B
$1.41M ﹤0.01%
17,204
-2,475
-13% -$208K
VTR icon
840
Ventas
VTR
$47.5B
$1.4M ﹤0.01%
17,072
-335
-2% -$27.4K
VONG icon
841
Vanguard Russell 1000 Growth ETF
VONG
$41.2B
$1.39M ﹤0.01%
12,705
+100
+0.8% +$11.7K
OGE icon
842
OGE Energy
OGE
$9.87B
$1.39M ﹤0.01%
29,025
+1,367
+5% +$62.5K
KVUE icon
843
Kenvue
KVUE
$38B
$1.39M ﹤0.01%
80,673
+2,193
+3% +$39.1K
CHDN icon
844
Churchill Downs
CHDN
$6.17B
$1.38M ﹤0.01%
15,399
+1,332
+9% +$127K
TFC icon
845
Truist Financial
TFC
$63.9B
$1.37M ﹤0.01%
29,853
+678
+2% +$33.5K
CRS icon
846
Carpenter Technology
CRS
$26.4B
$1.36M ﹤0.01%
3,460
-137
-4% -$49.9K
HEDG
847
Equable Shares Hedged Equity ETF
HEDG
$419M
$1.36M ﹤0.01%
46,945
-5,237
-10% -$154K
ALB icon
848
Albemarle
ALB
$13.4B
$1.34M ﹤0.01%
7,453
+979
+15% +$167K
URTH icon
849
iShares MSCI World ETF
URTH
$7.83B
$1.34M ﹤0.01%
7,429
+415
+6% +$77.7K
NTRA icon
850
Natera
NTRA
$36.4B
$1.33M ﹤0.01%
6,632
+797
+14% +$172K
32 33
34
35 36

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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.