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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
KFRC icon
1851
Kforce
KFRC
$1.03B
– –
-5,380
Closed -$226K
KN icon
1852
Knowles
KN
$3.33B
$0 ﹤0.01%
12
– –
KWR icon
1853
Quaker Houghton
KWR
$2.91B
– –
-1,200
Closed -$304K
KXI icon
1854
iShares Global Consumer Staples ETF
KXI
$1.06B
– –
-12
Closed -$1K
LAKE icon
1855
Lakeland Industries
LAKE
$119M
– –
-10,710
Closed -$292K
LAZ icon
1856
Lazard
LAZ
$4.24B
– –
-4,992
Closed -$211K
LRN icon
1857
Stride
LRN
$3.27B
– –
-12,100
Closed -$257K
MAG
1858
DELISTED
MAG Silver
MAG
– –
-16,824
Closed -$345K
MMS icon
1859
Maximus
MMS
$2.85B
– –
-4,375
Closed -$320K
NRC icon
1860
NRC Health Common Stock
NRC
$456M
– –
-10,000
Closed -$428K
OIH icon
1861
VanEck Oil Services ETF
OIH
$1.96B
– –
-45
Closed -$7K
PARAA
1862
DELISTED
Paramount Global Class A
PARAA
– –
-75
Closed -$3K
PBH icon
1863
Prestige Consumer Healthcare
PBH
$2.48B
– –
-35,004
Closed -$1.22M
PHM icon
1864
Pultegroup
PHM
$24.6B
– –
-20,210
Closed -$871K
PSL icon
1865
Invesco Dorsey Wright Consumer Staples Momentum ETF
PSL
$83.4M
– –
-44
Closed -$4K
BCIC
1866
BCP Investment Corp
BCIC
$95.6M
– –
-1,533
Closed -$29K
QID icon
1867
ProShares UltraShort QQQ
QID
$247M
– –
0
– –
REZ icon
1868
iShares Residential and Multisector Real Estate ETF
REZ
$848M
– –
-50
Closed -$3K
RRX icon
1869
Regal Rexnord
RRX
$11.5B
– –
-2,872
Closed -$353K
RVLV icon
1870
Revolve Group
RVLV
$1.69B
– –
-8,167
Closed -$255K
RZV icon
1871
Invesco S&P SmallCap 600 Pure Value ETF
RZV
$305M
– –
-500
Closed -$33K
SEE
1872
DELISTED
Sealed Air
SEE
– –
-4,489
Closed -$206K
SPTM icon
1873
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$14.1B
– –
-610
Closed -$28K
SRS icon
1874
ProShares UltraShort Real Estate
SRS
$16.1M
$0 ﹤0.01%
1
– –
SXT icon
1875
Sensient Technologies
SXT
$5.55B
– –
-2,716
Closed -$200K
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.