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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
HZN
1476
DELISTED
Horizon Global Corporation
HZN
$191K ﹤0.01%
18,500
– –
LBRDA icon
1477
Liberty Broadband Class A
LBRDA
$5.07B
$190K ﹤0.01%
1,306
+153
+13% +$22.7K
FDUS icon
1478
Fidus Investment
FDUS
$748M
$189K ﹤0.01%
12,139
+147
+1% +$2.1K
HEDJ icon
1479
WisdomTree Europe Hedged Equity Fund
HEDJ
$1.87B
$187K ﹤0.01%
5,132
– –
LSXMA
1480
DELISTED
Liberty Media Corporation Series A Liberty SiriusXM Common Stock
LSXMA
$184K ﹤0.01%
5,679
-122
-2% -$3.91K
EUFN icon
1481
iShares MSCI Europe Financials ETF
EUFN
$4.29B
$183K ﹤0.01%
9,483
– –
ING icon
1482
ING
ING
$102B
$183K ﹤0.01%
15,000
-319
-2% -$3.39K
SHLX
1483
DELISTED
Shell Midstream Partners, L.P.
SHLX
$181K ﹤0.01%
13,605
-3,851
-22% -$45.6K
UA icon
1484
Under Armour Class C
UA
$2.2B
$180K ﹤0.01%
9,756
-60
-0.6% -$1.05K
FNDA icon
1485
Schwab Fundamental US Small Company Index ETF
FNDA
$9.38B
$179K ﹤0.01%
7,074
-17,054
-71% -$413K
OOMA icon
1486
Ooma
OOMA
$553M
$177K ﹤0.01%
11,162
– –
ENFR icon
1487
Alerian Energy Infrastructure ETF
ENFR
$521M
$176K ﹤0.01%
+10,225
New +$169K
BXMT icon
1488
Blackstone Mortgage Trust
BXMT
$2.41B
$171K ﹤0.01%
5,525
+850
+18% +$24.7K
EWC icon
1489
iShares MSCI Canada ETF
EWC
$6.51B
$171K ﹤0.01%
5,022
– –
FTSM icon
1490
First Trust Enhanced Short Maturity ETF
FTSM
$6.54B
$171K ﹤0.01%
2,856
-138,000
-98% -$8.28M
CMBS icon
1491
iShares CMBS ETF
CMBS
$472M
$170K ﹤0.01%
+3,154
New +$172K
RPV icon
1492
Invesco S&P 500 Pure Value ETF
RPV
$1.73B
$170K ﹤0.01%
2,300
+120
+6% +$8.31K
BV icon
1493
BrightView Holdings
BV
$1.08B
$169K ﹤0.01%
+10,000
New +$160K
FBP icon
1494
First Bancorp
FBP
$4.46B
$169K ﹤0.01%
15,000
-10,000
-40% -$105K
INN
1495
Summit Hotel Properties
INN
$655M
$169K ﹤0.01%
16,644
– –
MTUM icon
1496
iShares MSCI USA Momentum Factor ETF
MTUM
$26B
$169K ﹤0.01%
1,052
+145
+16% +$24K
TBT icon
1497
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$309M
$169K ﹤0.01%
7,754
+1,600
+26% +$31K
FPX icon
1498
First Trust US Equity Opportunities ETF
FPX
$1.53B
$168K ﹤0.01%
1,410
– –
VG
1499
DELISTED
Vonage Holdings Corporation
VG
$168K ﹤0.01%
14,200
-2,800
-16% -$36.5K
ARDX icon
1500
Ardelyx
ARDX
$1.03B
$166K ﹤0.01%
25,100
+100
+0.4% +$686
58 59
60
61 62

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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.