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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
PS
1901
DELISTED
Pluralsight, Inc. Class A Common Stock
PS
– –
-38,009
Closed -$797K
HMSY
1902
DELISTED
HMS Holdings Corp.
HMSY
– –
-207,891
Closed -$7.64M
RSI.WS
1903
DELISTED
Rush Street Interactive, Inc. Redeemable Warrants, each whole warrant exercisable for one share of C
RSI.WS
– –
-349,641
Closed -$2.68M
SINA
1904
DELISTED
Sina Corp
SINA
– –
-7,500
Closed -$318K
EV
1905
DELISTED
Eaton Vance Corp.
EV
– –
-17,026
Closed -$1.16M
VRTU
1906
DELISTED
Virtusa Corporation
VRTU
– –
-8,343
Closed -$427K
PRVL
1907
DELISTED
Prevail Therapeutics Inc. Common Stock
PRVL
– –
-15,455
Closed -$357K
AIG.WS
1908
DELISTED
American International Group, Inc.
AIG.WS
– –
-4,771
Closed -$1K
PE
1909
DELISTED
PARSLEY ENERGY INC
PE
– –
-11,137
Closed -$158K
TIF
1910
DELISTED
Tiffany & Co.
TIF
– –
-7,600
Closed -$999K
VVNT.WS
1911
DELISTED
Vivint Smart Home, Inc. Warrants, each exercisable for one Class A Common Stock at an exercise price
VVNT.WS
– –
-9,417
Closed -$86K
CHL
1912
DELISTED
China Mobile Limited
CHL
– –
-62,214
Closed -$1.78M
DCOM
1913
DELISTED
Dime Community Bancshares
DCOM
– –
-46,600
Closed -$735K
73 74 75 76
77

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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.