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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
EXPO icon
751
Exponent
EXPO
$3.19B
$1.88M 0.01%
+28,806
New +$2.05M
IBRX icon
752
ImmunityBio
IBRX
$7.15B
$1.86M 0.01%
241,941
+1,727
+0.7% +$11.8K
OPCH icon
753
Option Care Health
OPCH
$3.76B
$1.85M 0.01%
68,624
-3,398
-5% -$110K
DLB icon
754
Dolby
DLB
$4.97B
$1.84M 0.01%
30,708
-2,667
-8% -$169K
CWAN
755
DELISTED
Clearwater Analytics
CWAN
$1.83M 0.01%
77,582
-3,295,378
-98% -$78M
IJT icon
756
iShares S&P Small-Cap 600 Growth ETF
IJT
$8.13B
$1.83M 0.01%
12,644
+1,462
+13% +$217K
FCNCA icon
757
First Citizens BancShares
FCNCA
$24.7B
$1.82M 0.01%
967
+7
+0.7% +$14K
BKR icon
758
Baker Hughes
BKR
$58.3B
$1.81M 0.01%
29,661
+5,978
+25% +$346K
WTW icon
759
Willis Towers Watson
WTW
$29.8B
$1.8M 0.01%
6,198
-118
-2% -$36.2K
RLI icon
760
RLI Corp
RLI
$6.02B
$1.8M 0.01%
+31,573
New +$1.9M
SPLV icon
761
Invesco S&P 500 Low Volatility ETF
SPLV
$7.24B
$1.8M 0.01%
24,558
-272
-1% -$20.2K
ALAB icon
762
Astera Labs
ALAB
$42.8B
$1.79M 0.01%
16,370
+1,323
+9% +$188K
EWC icon
763
iShares MSCI Canada ETF
EWC
$6.12B
$1.77M 0.01%
32,339
+982
+3% +$54.6K
HUBB icon
764
Hubbell
HUBB
$24.4B
$1.77M 0.01%
3,607
+5
+0.1% +$2.46K
FXY icon
765
Invesco CurrencyShares Japanese Yen Trust
FXY
$427M
$1.77M 0.01%
30,519
+12,383
+68% +$725K
AWK icon
766
American Water Works
AWK
$27B
$1.76M 0.01%
12,957
+1,108
+9% +$146K
NAPR icon
767
Innovator Growth-100 Power Buffer ETF April
NAPR
$207M
$1.76M 0.01%
32,273
-1,486
-4% -$80.5K
RWO icon
768
State Street SPDR Dow Jones Global Real Estate ETF
RWO
$1.32B
$1.75M 0.01%
38,231
+5,757
+18% +$272K
EIS icon
769
iShares MSCI Israel ETF
EIS
$863M
$1.75M 0.01%
15,076
+9,281
+160% +$1.11M
DTE icon
770
DTE Energy
DTE
$29.9B
$1.74M 0.01%
11,926
+1,589
+15% +$223K
NTR icon
771
Nutrien
NTR
$33.9B
$1.74M 0.01%
23,098
-1,074
-4% -$76.6K
BCO icon
772
Brink's
BCO
$5.01B
$1.74M 0.01%
16,806
-9,972
-37% -$1.2M
ZBH icon
773
Zimmer Biomet
ZBH
$18.8B
$1.74M 0.01%
19,251
+403
+2% +$37K
ES icon
774
Eversource Energy
ES
$28.1B
$1.74M 0.01%
25,080
-775
-3% -$54.8K
DASH icon
775
DoorDash
DASH
$84.3B
$1.74M 0.01%
11,556
+1,997
+21% +$369K
29 30
31
32 33

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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.