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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
SRLN icon
1576
State Street Blackstone Senior Loan ETF
SRLN
$5.37B
$94K ﹤0.01%
2,062
– –
MDYG icon
1577
State Street SPDR S&P 400 Mid Cap Growth ETF
MDYG
$2.96B
$93K ﹤0.01%
1,241
+223
+22% +$16.5K
AKBA icon
1578
Akebia Therapeutics
AKBA
$248M
$91K ﹤0.01%
26,963
+1,411
+6% +$5.08K
NDRA icon
1579
ENDRA Life Sciences
NDRA
$5.68M
$91K ﹤0.01%
+1
New +$74.9K
CGW icon
1580
Invesco S&P Global Water Index ETF
CGW
$1.07B
$88K ﹤0.01%
1,794
– –
MGC icon
1581
Vanguard Morningstar Mega Cap ETF
MGC
$10.4B
$87K ﹤0.01%
619
– –
AWRE icon
1582
Aware
AWRE
$26M
$86K ﹤0.01%
23,664
– –
FXG icon
1583
First Trust Consumer Staples AlphaDEX Fund
FXG
$230M
$86K ﹤0.01%
+1,500
New +$81.3K
FXL icon
1584
First Trust Technology AlphaDEX Fund
FXL
$2.84B
$85K ﹤0.01%
751
+136
+22% +$15.7K
IGF icon
1585
iShares Global Infrastructure ETF
IGF
$10.7B
$85K ﹤0.01%
1,897
+700
+58% +$30.9K
JNK icon
1586
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.31B
$85K ﹤0.01%
780
+74
+10% +$8.04K
VBIV
1587
DELISTED
VBI Vaccines, Inc. New Common Stock (Canada)
VBIV
$84K ﹤0.01%
901
– –
PGF icon
1588
Invesco Financial Preferred ETF
PGF
$668M
$83K ﹤0.01%
4,390
-200
-4% -$3.75K
GERM
1589
DELISTED
Amplify Treatments, Testing and Advancements ETF
GERM
$83K ﹤0.01%
2,332
– –
HDSN
1590
Hudson Technologies
HDSN
$236M
$82K ﹤0.01%
50,900
+5,000
+11% +$7.26K
SMFG icon
1591
Sumitomo Mitsui Financial
SMFG
$166B
$82K ﹤0.01%
+11,342
New +$79K
VOOG icon
1592
Vanguard S&P 500 Growth ETF
VOOG
$27.2B
$82K ﹤0.01%
2,094
+324
+18% +$12.6K
SCHV
1593
Schwab US Large-Cap Value ETF
SCHV
$16.3B
$81K ﹤0.01%
3,723
+723
+24% +$15.1K
SPAB icon
1594
State Street SPDR Portfolio Aggregate Bond ETF
SPAB
$9.93B
$81K ﹤0.01%
2,722
– –
IOO icon
1595
iShares Global 100 ETF
IOO
$9.43B
$79K ﹤0.01%
1,190
-375
-24% -$24.3K
ZG icon
1596
Zillow
ZG
$7.53B
$79K ﹤0.01%
603
-133
-18% -$20.5K
XHB icon
1597
State Street SPDR S&P Homebuilders ETF
XHB
$1.58B
$78K ﹤0.01%
1,103
+576
+109% +$36.7K
ASMB icon
1598
Assembly Biosciences
ASMB
$536M
$76K ﹤0.01%
+1,375
New +$91.1K
DON icon
1599
WisdomTree US MidCap Dividend Fund
DON
$4.1B
$76K ﹤0.01%
1,877
-96
-5% -$3.65K
EES icon
1600
WisdomTree US SmallCap Earnings Fund
EES
$730M
$76K ﹤0.01%
1,611
+500
+45% +$22.3K
62 63
64
65 66

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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.