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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
IPAY icon
1601
Amplify Mobile Payments ETF
IPAY
$181M
$71K ﹤0.01%
1,069
+250
+31% +$16.9K
PBW icon
1602
Invesco WilderHill Clean Energy ETF
PBW
$458M
$71K ﹤0.01%
726
+326
+82% +$37.3K
PSQ icon
1603
ProShares Short QQQ
PSQ
$642M
$70K ﹤0.01%
1,010
-24
-2% -$1.68K
SJNK icon
1604
State Street SPDR Bloomberg Short Term High Yield Bond ETF
SJNK
$4.8B
$69K ﹤0.01%
2,532
-1,813
-42% -$49.1K
EWX icon
1605
State Street SPDR S&P Emerging Markets Small Cap ETF
EWX
$702M
$68K ﹤0.01%
1,220
– –
SLYV icon
1606
State Street SPDR S&P 600 Small Cap Value ETF
SLYV
$5.08B
$68K ﹤0.01%
824
– –
NCNA
1607
NuCana
NCNA
$5.95M
$67K ﹤0.01%
3
-1
-25% -$27.9K
IYY icon
1608
iShares Dow Jones US ETF
IYY
$3.07B
$66K ﹤0.01%
660
-2,030
-75% -$198K
PAYS icon
1609
Paysign
PAYS
$723M
$66K ﹤0.01%
15,120
– –
SHYG icon
1610
iShares 0-5 Year High Yield Corporate Bond ETF
SHYG
$7.61B
$66K ﹤0.01%
1,448
-4,206
-74% -$191K
BGY icon
1611
BlackRock Enhanced International Dividend Trust
BGY
$532M
$65K ﹤0.01%
10,787
– –
DBEU icon
1612
Xtrackers MSCI Europe Hedged Equity ETF
DBEU
$798M
$65K ﹤0.01%
2,000
– –
HEWG
1613
DELISTED
iShares Currency Hedged MSCI Germany ETF
HEWG
$65K ﹤0.01%
2,039
– –
RESE
1614
DELISTED
WisdomTree Emerging Markets ESG Fund
RESE
$65K ﹤0.01%
1,722
+3
+0.2% +$114
ADRE
1615
DELISTED
Invesco BLDRS Emerging Markets 50 ADR Index Fund
ADRE
$65K ﹤0.01%
+1,152
New +$69.4K
AIVI icon
1616
WisdomTree International AI Enhanced Value Fund
AIVI
$63.1M
$62K ﹤0.01%
1,450
– –
SPYD icon
1617
State Street SPDR Portfolio S&P 500 High Dividend ETF
SPYD
$7.69B
$62K ﹤0.01%
1,603
– –
JHML icon
1618
John Hancock Multifactor Large Cap ETF
JHML
$1.2B
$61K ﹤0.01%
1,207
+650
+117% +$32K
SAN icon
1619
Banco Santander
SAN
$211B
$60K ﹤0.01%
17,408
+6,063
+53% +$20.5K
SPMD icon
1620
State Street SPDR Portfolio S&P 400 Mid Cap ETF
SPMD
$19B
$59K ﹤0.01%
1,300
+29
+2% +$1.27K
GUNR icon
1621
FlexShares Global Upstream Natural Resources Index Fund
GUNR
$7.09B
$58K ﹤0.01%
1,599
-75
-4% -$2.67K
ITEQ icon
1622
Amplify BlueStar Israel Technology ETF
ITEQ
$118M
$58K ﹤0.01%
900
-200
-18% -$14.2K
PSK icon
1623
State Street SPDR ICE Preferred Securities ETF
PSK
$683M
$58K ﹤0.01%
1,330
– –
SCHO icon
1624
Schwab Short-Term US Treasury ETF
SCHO
$12.9B
$57K ﹤0.01%
2,230
– –
VDE icon
1625
Vanguard Energy ETF
VDE
$10.4B
$57K ﹤0.01%
833
+55
+7% +$3.52K
63 64
65
66 67

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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.