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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
XAR icon
1726
State Street SPDR S&P Aerospace & Defense ETF
XAR
$6.64B
$19K ﹤0.01%
148
-4
-3% -$484
ERUS
1727
DELISTED
iShares MSCI Russia ETF
ERUS
$19K ﹤0.01%
487
– –
IGM icon
1728
iShares Expanded Tech Sector ETF
IGM
$10.8B
$18K ﹤0.01%
300
-192
-39% -$11.5K
DIG icon
1729
ProShares Ultra Energy
DIG
$83.3M
$17K ﹤0.01%
1,144
– –
RGLS
1730
DELISTED
Regulus Therapeutics
RGLS
$17K ﹤0.01%
1,070
-50
-4% -$740
RZG icon
1731
Invesco S&P SmallCap 600 Pure Growth ETF
RZG
$138M
$17K ﹤0.01%
330
– –
XTL icon
1732
State Street SPDR S&P Telecom ETF
XTL
$558M
$17K ﹤0.01%
179
– –
EWD icon
1733
iShares MSCI Sweden ETF
EWD
$582M
$16K ﹤0.01%
350
– –
OXY.WS icon
1734
Occidental Petroleum Corp Warrants
OXY.WS
$34.4B
$16K ﹤0.01%
1,314
-109
-8% -$1.23K
BUZZ icon
1735
VanEck Social Sentiment ETF
BUZZ
$101M
$15K ﹤0.01%
+637
New +$15.5K
EPP icon
1736
iShares MSCI Pacific ex Japan ETF
EPP
$2.26B
$15K ﹤0.01%
292
-300
-51% -$15K
EZA icon
1737
iShares MSCI South Africa ETF
EZA
$567M
$15K ﹤0.01%
296
– –
FXU icon
1738
First Trust Utilities AlphaDEX Fund
FXU
$827M
$15K ﹤0.01%
517
+256
+98% +$7.26K
ISCV icon
1739
iShares Morningstar Small-Cap Value ETF
ISCV
$706M
$15K ﹤0.01%
261
– –
SBIO icon
1740
ALPS Medical Breakthroughs ETF
SBIO
$217M
$15K ﹤0.01%
+300
New +$16.6K
SUPN icon
1741
Supernus Pharmaceuticals
SUPN
$2.78B
$15K ﹤0.01%
590
+115
+24% +$3.22K
CUT icon
1742
Invesco MSCI Global Timber ETF
CUT
$33.4M
$14K ﹤0.01%
400
– –
XMPT icon
1743
VanEck CEF Muni Income ETF
XMPT
$219M
$14K ﹤0.01%
474
– –
CHIQ icon
1744
Global X MSCI China Consumer Discretionary ETF
CHIQ
$123M
$13K ﹤0.01%
396
– –
HYEM icon
1745
VanEck Emerging Markets High Yield Bond ETF
HYEM
$526M
$13K ﹤0.01%
+570
New +$13.5K
LQDH icon
1746
iShares Interest Rate Hedged Corporate Bond ETF
LQDH
$540M
$13K ﹤0.01%
130
+3
+2% +$286
PGJ icon
1747
Invesco Golden Dragon China ETF
PGJ
$95.1M
$13K ﹤0.01%
200
– –
MXI icon
1748
iShares Global Materials ETF
MXI
$361M
$12K ﹤0.01%
138
-10
-7% -$853
HIMS.WS
1749
DELISTED
Hims & Hers Health, Inc. Warrants, each whole warrant exercisable for one Class A Common Stock at an
HIMS.WS
$12K ﹤0.01%
+2,800
New +$18.3K
ECH icon
1750
iShares MSCI Chile ETF
ECH
$1.03B
$11K ﹤0.01%
319
-22
-6% -$714
68 69
70
71 72

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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.