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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
CDNS icon
726
Cadence Design Systems
CDNS
$91.8B
$2.08M 0.01%
7,501
+1,746
+30% +$521K
GAIN icon
727
Gladstone Investment Corp
GAIN
$642M
$2.07M 0.01%
145,754
-8,728
-6% -$122K
MAIN icon
728
Main Street Capital
MAIN
$5.05B
$2.07M 0.01%
39,040
+244
+0.6% +$14.5K
RIO icon
729
Rio Tinto
RIO
$152B
$2.06M 0.01%
22,132
-1,866
-8% -$170K
KEYS icon
730
Keysight
KEYS
$50.7B
$2.06M 0.01%
7,293
-1,489
-17% -$373K
AFL icon
731
Aflac
AFL
$65.5B
$2.06M 0.01%
18,747
-453
-2% -$50.2K
WAL icon
732
Western Alliance Bancorporation
WAL
$8.81B
$2.04M 0.01%
28,819
-6,686
-19% -$557K
SCZ icon
733
iShares MSCI EAFE Small-Cap ETF
SCZ
$13.1B
$2.03M 0.01%
25,855
+942
+4% +$76.6K
B
734
Barrick Mining
B
$60.9B
$1.97M 0.01%
48,236
-43,135
-47% -$1.99M
UAL icon
735
United Airlines
UAL
$38.8B
$1.97M 0.01%
21,355
+897
+4% +$94K
WY icon
736
Weyerhaeuser
WY
$17.6B
$1.96M 0.01%
80,249
+26,930
+51% +$677K
VFH icon
737
Vanguard Financials ETF
VFH
$13.4B
$1.95M 0.01%
16,168
+688
+4% +$87.7K
USAR
738
USA Rare Earth Inc
USAR
$3.2B
$1.94M 0.01%
128,321
+62,912
+96% +$1.22M
PEG icon
739
Public Service Enterprise Group
PEG
$38.7B
$1.94M 0.01%
23,991
+3,102
+15% +$254K
EPI icon
740
WisdomTree India Earnings Fund ETF
EPI
$2.04B
$1.92M 0.01%
47,054
-3,155
-6% -$140K
COHR icon
741
Coherent
COHR
$43.4B
$1.91M 0.01%
8,013
+877
+12% +$201K
OTIS icon
742
Otis Worldwide
OTIS
$27.9B
$1.91M 0.01%
24,744
+2,157
+10% +$189K
MTB icon
743
M&T Bank
MTB
$36.3B
$1.9M 0.01%
9,200
+237
+3% +$51K
LEN icon
744
Lennar Class A
LEN
$20.4B
$1.9M 0.01%
21,873
-177
-0.8% -$19.1K
CALF icon
745
Pacer US Small Cap Cash Cows 100 ETF
CALF
$3.75B
$1.9M 0.01%
42,262
+19,853
+89% +$903K
EL icon
746
Estee Lauder
EL
$30.4B
$1.89M 0.01%
26,374
-139
-0.5% -$14.2K
BND icon
747
Vanguard Total Bond Market
BND
$158B
$1.89M 0.01%
25,694
+2,922
+13% +$217K
ADPT icon
748
Adaptive Biotechnologies
ADPT
$3.61B
$1.89M 0.01%
136,089
+49,623
+57% +$791K
EA icon
749
Electronic Arts
EA
$52.4B
$1.88M 0.01%
9,244
-1,950
-17% -$394K
MLPA icon
750
Global X MLP ETF
MLPA
$2.26B
$1.88M 0.01%
34,907
+5,220
+18% +$273K
28 29
30
31 32

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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.