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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
DWM icon
1426
WisdomTree International Equity Fund
DWM
$693M
$227K ﹤0.01%
4,322
+6
+0.1% +$313
EWT icon
1427
iShares MSCI Taiwan ETF
EWT
$11.4B
$227K ﹤0.01%
3,784
+100
+3% +$5.81K
HWM icon
1428
Howmet Aerospace
HWM
$112B
$226K ﹤0.01%
7,026
-803
-10% -$23.1K
DLTR icon
1429
Dollar Tree
DLTR
$24.7B
$225K ﹤0.01%
1,968
-378
-16% -$40.6K
VXX icon
1430
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$141M
$225K ﹤0.01%
+308
New +$308K
TRN icon
1431
Trinity Industries
TRN
$2.3B
$224K ﹤0.01%
7,854
+28
+0.4% +$823
HCCI
1432
DELISTED
Heritage-Crystal Clean, Inc.
HCCI
$223K ﹤0.01%
+8,233
New +$206K
EWU icon
1433
iShares MSCI United Kingdom ETF
EWU
$4.14B
$222K ﹤0.01%
7,092
– –
XNTK icon
1434
State Street SPDR NYSE Technology ETF
XNTK
$2.25B
$222K ﹤0.01%
1,534
-116
-7% -$17.1K
SPWR
1435
DELISTED
SunPower Corporation Common Stock
SPWR
$222K ﹤0.01%
+6,623
New +$248K
CTIC
1436
DELISTED
CTI BioPharma Corp. (DE) Common Stock
CTIC
$222K ﹤0.01%
76,198
– –
UAA icon
1437
Under Armour
UAA
$2.26B
$221K ﹤0.01%
9,980
+395
+4% +$8.25K
ACGL icon
1438
Arch Capital
ACGL
$33.2B
$219K ﹤0.01%
+5,708
New +$203K
EWO icon
1439
iShares MSCI Austria ETF
EWO
$187M
$219K ﹤0.01%
10,000
– –
PAA icon
1440
Plains All American Pipeline
PAA
$16.4B
$219K ﹤0.01%
24,024
-7,694
-24% -$70.3K
DISCK
1441
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
$219K ﹤0.01%
5,932
-17
-0.3% -$721
OGS icon
1442
ONE Gas
OGS
$5.05B
$218K ﹤0.01%
2,837
-15
-0.5% -$1.09K
TEVA icon
1443
Teva Pharmaceuticals
TEVA
$42.8B
$218K ﹤0.01%
18,850
-838
-4% -$9.61K
BAB icon
1444
Invesco Taxable Municipal Bond ETF
BAB
$1.01B
$217K ﹤0.01%
6,786
+750
+12% +$24.7K
NVR icon
1445
NVR
NVR
$16.8B
$217K ﹤0.01%
+46
New +$206K
ICF icon
1446
iShares Select U.S. REIT ETF
ICF
$2.09B
$216K ﹤0.01%
3,740
+720
+24% +$39.7K
NSIT icon
1447
Insight Enterprises
NSIT
$4.54B
$216K ﹤0.01%
+2,265
New +$194K
VRSN icon
1448
VeriSign
VRSN
$25.6B
$216K ﹤0.01%
+1,089
New +$214K
AMN icon
1449
AMN Healthcare
AMN
$1.26B
$215K ﹤0.01%
+2,923
New +$217K
VST icon
1450
Vistra
VST
$49.2B
$214K ﹤0.01%
+12,078
New +$240K
56 57
58
59 60

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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.