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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
AII
1401
American Integrity Insurance
AII
$398M
$245K ﹤0.01%
12,727
-11,673
-48% -$222K
MIDD icon
1402
Middleby
MIDD
$6.01B
$245K ﹤0.01%
1,845
-184
-9% -$27.9K
SUN icon
1403
Sunoco
SUN
$14.4B
$245K ﹤0.01%
+3,764
New +$228K
SHE icon
1404
State Street SPDR MSCI USA Gender Diversity ETF
SHE
$318M
$244K ﹤0.01%
1,908
+12
+0.6% +$1.6K
ACA icon
1405
Arcosa
ACA
$7.11B
$243K ﹤0.01%
2,294
+23
+1% +$2.62K
AIVL icon
1406
WisdomTree US AI Enhanced Value Fund
AIVL
$428M
$243K ﹤0.01%
2,103
– –
OPEN icon
1407
Opendoor
OPEN
$3.54B
$243K ﹤0.01%
51,923
– –
FNDA icon
1408
Schwab Fundamental US Small Company Index ETF
FNDA
$9.1B
$242K ﹤0.01%
7,469
-2
-0% -$67
SW
1409
Smurfit Westrock
SW
$25.3B
$242K ﹤0.01%
+6,064
New +$262K
CBT icon
1410
Cabot Corp
CBT
$4.72B
$240K ﹤0.01%
3,186
+148
+5% +$10.7K
EPR icon
1411
EPR Properties
EPR
$4.89B
$240K ﹤0.01%
4,799
+75
+2% +$4.12K
TSN icon
1412
Tyson Foods
TSN
$21.5B
$239K ﹤0.01%
3,736
-595
-14% -$36.9K
IXJ icon
1413
iShares Global Healthcare ETF
IXJ
$4.16B
$239K ﹤0.01%
2,553
-100
-4% -$9.79K
SIL icon
1414
Global X Silver Miners ETF NEW
SIL
$3.93B
$239K ﹤0.01%
2,650
+1,070
+68% +$105K
FXI icon
1415
iShares China Large-Cap ETF
FXI
$4.32B
$238K ﹤0.01%
6,640
+1,292
+24% +$49.1K
KIE icon
1416
State Street SPDR S&P Insurance ETF
KIE
$664M
$238K ﹤0.01%
4,329
– –
INVH icon
1417
Invitation Homes
INVH
$17.9B
$235K ﹤0.01%
9,448
-133
-1% -$3.48K
SLAB icon
1418
Silicon Laboratories
SLAB
$7.14B
$234K ﹤0.01%
+1,124
New +$206K
EWT icon
1419
iShares MSCI Taiwan ETF
EWT
$9.13B
$234K ﹤0.01%
3,295
– –
NTLA icon
1420
Intellia Therapeutics
NTLA
$1.51B
$233K ﹤0.01%
18,210
+50
+0.3% +$637
GSHD icon
1421
Goosehead Insurance
GSHD
$1.68B
$233K ﹤0.01%
5,459
-1,372
-20% -$76.7K
MGEE icon
1422
MGE Energy Inc
MGEE
$3.03B
$232K ﹤0.01%
3,005
-95
-3% -$7.48K
EPRT icon
1423
Essential Properties Realty Trust
EPRT
$6.92B
$232K ﹤0.01%
+7,640
New +$242K
ZS icon
1424
Zscaler
ZS
$24.9B
$232K ﹤0.01%
1,653
+629
+61% +$112K
FBNC icon
1425
First Bancorp
FBNC
$2.61B
$231K ﹤0.01%
4,106
+64
+2% +$3.65K
55 56
57
58 59

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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.