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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
DOX icon
1376
Amdocs
DOX
$6.08B
$262K ﹤0.01%
3,728
+92
+3% +$6.95K
TILT icon
1377
FlexShares Morningstar US Market Factors Tilt Index Fund
TILT
$2.27B
$262K ﹤0.01%
1,641
– –
BWX icon
1378
State Street SPDR Bloomberg International Treasury Bond ETF
BWX
$1.31B
$260K ﹤0.01%
8,915
-1,234
-12% -$37.4K
FTS icon
1379
Fortis
FTS
$28.8B
$260K ﹤0.01%
5,985
+88
+1% +$3.61K
WRB icon
1380
W.R. Berkley
WRB
$25.9B
$260K ﹤0.01%
7,776
-594
-7% -$18.3K
DTIL icon
1381
Precision BioSciences
DTIL
$206M
$259K ﹤0.01%
835
+110
+15% +$38.5K
IDCC icon
1382
InterDigital
IDCC
$8.87B
$259K ﹤0.01%
4,080
– –
SYBT icon
1383
Stock Yards Bancorp
SYBT
$2.64B
$259K ﹤0.01%
+5,066
New +$243K
MGV icon
1384
Vanguard Morningstar Mega Cap Value ETF
MGV
$13.7B
$258K ﹤0.01%
2,713
– –
JWN
1385
DELISTED
Nordstrom
JWN
$255K ﹤0.01%
6,724
-1,800
-21% -$66.6K
FHN icon
1386
First Horizon
FHN
$12.3B
$254K ﹤0.01%
15,050
-460
-3% -$7.28K
SCHX icon
1387
Schwab US Large- Cap ETF
SCHX
$74.8B
$253K ﹤0.01%
15,822
-29,388
-65% -$460K
FLGT icon
1388
Fulgent Genetics
FLGT
$513M
$252K ﹤0.01%
+2,605
New +$269K
AAL icon
1389
American Airlines Group
AAL
$9.96B
$249K ﹤0.01%
10,400
-2,418
-19% -$46.6K
EMLP icon
1390
First Trust North American Energy Infrastructure Fund
EMLP
$4.16B
$249K ﹤0.01%
10,899
+2,244
+26% +$49.5K
IWC icon
1391
iShares Micro-Cap ETF
IWC
$1.51B
$249K ﹤0.01%
1,695
– –
HBT icon
1392
HBT Financial
HBT
$1.35B
$248K ﹤0.01%
14,500
– –
PRFZ icon
1393
Invesco FTSE RAFI US 1500 Small-Mid ETF
PRFZ
$2.9B
$248K ﹤0.01%
7,025
+875
+14% +$29.9K
LMRK
1394
DELISTED
Landmark Infrastructure Partners LP Common Units
LMRK
$247K ﹤0.01%
20,900
– –
ATOM icon
1395
Atomera
ATOM
$218M
$245K ﹤0.01%
10,000
– –
USHY icon
1396
iShares Broad USD High Yield Corporate Bond ETF
USHY
$29.2B
$244K ﹤0.01%
5,922
-3,187
-35% -$131K
SKY icon
1397
Champion Homes
SKY
$5.17B
$243K ﹤0.01%
+5,379
New +$216K
ATO icon
1398
Atmos Energy
ATO
$28.7B
$242K ﹤0.01%
2,444
-3,318
-58% -$302K
AXS icon
1399
AXIS Capital
AXS
$7.27B
$242K ﹤0.01%
4,876
-2,458
-34% -$123K
FDD icon
1400
First Trust STOXX European Select Dividend Income Fund
FDD
$907M
$242K ﹤0.01%
17,155
-497
-3% -$6.74K
54 55
56
57 58

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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.