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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
+2.39%
1 Year Est. Return
+25.71%
3 Year Est. Return
+88.7%
5 Year Est. Return
+104.53%
10 Year Est. Return
+665.86%
AUM
$26.5B
AUM Growth
-$769M
Cap. Flow
-$1.09B
Cap. Flow %
-4.11%
Top 10 Hldgs %
22.54%
Holding
1,941
New
123
Increased
715
Reduced
742
Closed
84

Top Buys

Rank Stock Value
1
KMX icon
CarMax
KMX
+$73M
2
OSH
Oak Street Health, Inc.
OSH
+$60.6M
3
IRTC icon
iRhythm Holdings
IRTC
+$51.2M
4
DXCM icon
DexCom
DXCM
+$39.4M
5
AON icon
Aon
AON
+$30.5M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$449M
2
VUG icon
Vanguard Morningstar Growth ETF
VUG
+$271M
3
AMZN icon
Amazon
AMZN
+$157M
4
MSFT icon
Microsoft
MSFT
+$83.3M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$78.4M

Sector Composition

Rank Sector Weight
1 Technology 25.67%
2 Healthcare 19.26%
3 Financials 11.68%
4 Consumer Discretionary 10.53%
5 Industrials 9.66%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
SCWX
1501
DELISTED
SecureWorks Corp Class A Common Stock
SCWX
$165K ﹤0.01%
12,354
– –
KIE icon
1502
State Street SPDR S&P Insurance ETF
KIE
$676M
$164K ﹤0.01%
4,475
+4,275
+2,138% +$150K
PSCE icon
1503
Invesco S&P SmallCap Energy ETF
PSCE
$104M
$163K ﹤0.01%
+5,160
New +$155K
EEMV icon
1504
iShares MSCI Emerging Markets Min Vol Factor ETF
EEMV
$3.6B
$162K ﹤0.01%
2,570
-507
-16% -$32K
EWA icon
1505
iShares MSCI Australia ETF
EWA
$1.46B
$162K ﹤0.01%
6,534
– –
IMTB icon
1506
iShares Core 5-10 Year USD Bond ETF
IMTB
$275M
$160K ﹤0.01%
3,145
– –
MRO
1507
DELISTED
Marathon Oil Corporation
MRO
$156K ﹤0.01%
14,587
-27
-0.2% -$261
ETHO icon
1508
Amplify Etho Climate Leadership US ETF
ETHO
$195M
$154K ﹤0.01%
2,680
– –
INDA icon
1509
iShares MSCI India ETF
INDA
$6.58B
$154K ﹤0.01%
3,650
– –
PVLA
1510
Palvella Therapeutics
PVLA
$2.23B
$154K ﹤0.01%
750
+125
+20% +$27.3K
SPTS icon
1511
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.11B
$153K ﹤0.01%
5,000
– –
BSM icon
1512
Black Stone Minerals
BSM
$3.08B
$152K ﹤0.01%
17,433
– –
BIV icon
1513
Vanguard Intermediate-Term Bond ETF
BIV
$28.8B
$151K ﹤0.01%
1,703
-1,204
-41% -$109K
ICSH icon
1514
iShares Ultra Short Duration Bond Active ETF
ICSH
$8.4B
$151K ﹤0.01%
2,996
+282
+10% +$14.2K
IVOL icon
1515
Quadratic Interest Rate Volatility and Inflation Hedge ETF
IVOL
$270M
$150K ﹤0.01%
+5,237
New +$149K
SHE icon
1516
State Street SPDR MSCI USA Gender Diversity ETF
SHE
$337M
$150K ﹤0.01%
1,581
+1
+0.1% +$93
TDW icon
1517
Tidewater
TDW
$4.56B
$150K ﹤0.01%
12,006
-5,000
-29% -$60.6K
OPENW
1518
DELISTED
Opendoor Technologies Inc Warrants expiring 12/18/2025
OPENW
$149K ﹤0.01%
14,564
-27,276
-65% -$378K
PWB icon
1519
Invesco Large Cap Growth ETF
PWB
$2.43B
$147K ﹤0.01%
2,157
– –
OSBC icon
1520
Old Second Bancorp
OSBC
$1.31B
$146K ﹤0.01%
11,056
-25,499
-70% -$300K
BBH icon
1521
VanEck Biotech ETF
BBH
$429M
$145K ﹤0.01%
825
+150
+22% +$27.1K
HYS icon
1522
PIMCO 0-5 Year High Yield Corporate Bond Index Exchange-Traded Fund
HYS
$1.77B
$145K ﹤0.01%
1,462
+26
+2% +$2.56K
SSRM icon
1523
SSR Mining
SSRM
$6.63B
$145K ﹤0.01%
10,133
– –
VONV icon
1524
Vanguard Russell 1000 Value ETF
VONV
$22B
$145K ﹤0.01%
+2,178
New +$138K
CLNE icon
1525
Clean Energy Fuels
CLNE
$384M
$142K ﹤0.01%
+10,350
New +$133K
59 60
61
62 63

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William Blair & Company's Q1 2021 Portfolio in Review

As of Q1 2021, William Blair & Company held 1,941 positions worth $26.5B, down 2.8% from $27.3B the previous quarter. Its ten largest holdings account for 23% of the portfolio.

William Blair & Company withdrew a net $1.09B in Q1 2021, closing 84 positions and reducing 742 holdings. Its most notable exit was HMS Holdings Corp., an estimated $7.64M position sold in full.

By sector, the portfolio is most concentrated in Technology at 26% of assets, down from 28% a quarter earlier, followed by Healthcare and Financials.

Against the trend, William Blair & Company opened a new position in Oak Street Health, Inc. worth $59.1M.

  • William Blair & Company's largest Q1 2021 buy was Oak Street Health, Inc.: 1,089,318 shares worth $59.1M.
  • William Blair & Company added most to CarMax in Q1 2021, an estimated $73M increase.
  • William Blair & Company's biggest Q1 2021 reduction was Apple, cutting an estimated $449M.
  • William Blair & Company fully exited HMS Holdings Corp. in Q1 2021, selling an estimated $7.64M.
  • William Blair & Company's ten largest holdings make up 23% of its $26.5B portfolio in Q1 2021.
  • William Blair & Company opened 123 new positions and closed 84 in Q1 2021.
  • William Blair & Company's portfolio value fell 2.8% quarter-over-quarter to $26.5B.

Based on William Blair & Company's 13F filing for Q1 2021, filed 13 May 2021.