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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
GLDG
1676
GoldMining Inc
GLDG
$223M
$33K ﹤0.01%
20,000
– –
GSIE icon
1677
Goldman Sachs ActiveBeta International Equity ETF
GSIE
$6.14B
$33K ﹤0.01%
991
+585
+144% +$19.2K
PCRX icon
1678
Pacira BioSciences
PCRX
$945M
$33K ﹤0.01%
470
– –
NMTR
1679
DELISTED
9 Meters Biopharma
NMTR
$33K ﹤0.01%
1,400
+200
+17% +$6.15K
FPEI icon
1680
First Trust Institutional Preferred Securities and Income ETF
FPEI
$1.94B
$32K ﹤0.01%
1,555
+17
+1% +$346
FWONA icon
1681
Liberty Media Series A
FWONA
$23.7B
$32K ﹤0.01%
868
+69
+9% +$2.58K
GBF icon
1682
iShares Government/Credit Bond ETF
GBF
$128M
$32K ﹤0.01%
270
-100
-27% -$12.2K
IYG icon
1683
iShares US Financial Services ETF
IYG
$2.22B
$32K ﹤0.01%
561
-480
-46% -$26K
SOCL icon
1684
Global X Social Media ETF
SOCL
$90.3M
$32K ﹤0.01%
485
– –
ILCG icon
1685
iShares Morningstar Growth ETF
ILCG
$3.28B
$31K ﹤0.01%
540
-125
-19% -$7.32K
IXP icon
1686
iShares Global Comm Services ETF
IXP
$561M
$31K ﹤0.01%
380
+295
+347% +$23.3K
AOM icon
1687
iShares Core Moderate Allocation ETF
AOM
$1.77B
$30K ﹤0.01%
700
– –
HEZU icon
1688
iShares Currency Hedged MSCI Eurozone ETF
HEZU
$590M
$30K ﹤0.01%
880
– –
IYM icon
1689
iShares US Basic Materials ETF
IYM
$1.02B
$30K ﹤0.01%
239
– –
JETS icon
1690
US Global Jets ETF
JETS
$825M
$30K ﹤0.01%
1,104
-39,963
-97% -$981K
PBE icon
1691
Invesco Biotechnology & Genome ETF
PBE
$358M
$30K ﹤0.01%
400
– –
BLV icon
1692
Vanguard Long-Term Bond ETF
BLV
$5.7B
$29K ﹤0.01%
297
-251
-46% -$25.8K
EEMS icon
1693
iShares MSCI Emerging Markets Small-Cap ETF
EEMS
$379M
$29K ﹤0.01%
500
– –
ARI
1694
Apollo Commercial Real Estate
ARI
$885M
$28K ﹤0.01%
2,000
-200
-9% -$2.57K
BATRK icon
1695
Atlanta Braves Holdings Series B
BATRK
$3.4B
$28K ﹤0.01%
1,023
-511
-33% -$14.4K
GENZ
1696
VanEck Digital Native Economy ETF
GENZ
$17.5M
$28K ﹤0.01%
520
+20
+4% +$1.02K
IBDT icon
1697
iShares iBonds Dec 2028 Term Corporate ETF
IBDT
$4.07B
$28K ﹤0.01%
1,000
– –
MORT icon
1698
VanEck Mortgage REIT Income ETF
MORT
$373M
$28K ﹤0.01%
+1,500
New +$26.6K
RSPT icon
1699
Invesco S&P 500 Equal Weight Technology ETF
RSPT
$5.95B
$28K ﹤0.01%
1,040
– –
STZ.B
1700
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
$28K ﹤0.01%
+122
New +$27.7K
66 67
68
69 70

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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.