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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
+13.98%
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
$27.3B
AUM Growth
+$3.7B
Cap. Flow
+$865M
Cap. Flow %
3.17%
Top 10 Hldgs %
25.38%
Holding
1,900
New
178
Increased
749
Reduced
623
Closed
72

Top Buys

Rank Stock Value
1
SPLK
Splunk Inc
SPLK
+$77.8M
2
GD icon
General Dynamics
GD
+$49.6M
3
ROK icon
Rockwell Automation
ROK
+$43.3M
4
LMBS icon
First Trust Exchange-Traded Fund IV First Trust Low Duration Opportunities ETF
LMBS
+$32.3M
5
JPM icon
JPMorgan Chase
JPM
+$30.6M

Top Sells

Rank Stock Value
1
WORK
Slack Technologies, Inc.
WORK
+$24.2M
2
NTRS icon
Northern Trust
NTRS
+$24.1M
3
BKNG icon
Booking.com
BKNG
+$22.5M
4
EXEL icon
Exelixis
EXEL
+$17.5M
5
DOCU
DocuSign
DOCU
+$15M

Sector Composition

Rank Sector Weight
1 Technology 27.82%
2 Healthcare 18.6%
3 Financials 11.15%
4 Consumer Discretionary 10.38%
5 Industrials 8.96%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
WSO icon
51
Watsco Inc
WSO
$12.8B
$127M 0.47%
560,026
-1,613
-0.3% -$371K
PGR icon
52
Progressive
PGR
$121B
$126M 0.46%
1,269,790
+86,555
+7% +$8.19M
PG icon
53
Procter & Gamble
PG
$335B
$119M 0.43%
851,740
+36,703
+5% +$5.13M
KMX icon
54
CarMax
KMX
$8.33B
$118M 0.43%
1,251,743
+171,081
+16% +$16M
UNH icon
55
UnitedHealth
UNH
$364B
$116M 0.42%
330,403
+6,388
+2% +$2.14M
TDG icon
56
TransDigm Group
TDG
$68.3B
$115M 0.42%
185,894
-4,491
-2% -$2.47M
SPLK
57
DELISTED
Splunk Inc
SPLK
$113M 0.42%
666,477
+406,902
+157% +$77.8M
XYZ
58
Block Inc
XYZ
$47B
$112M 0.41%
514,881
+62,455
+14% +$12.2M
COUP
59
DELISTED
Coupa Software Incorporated
COUP
$107M 0.39%
314,331
+36,988
+13% +$11.4M
APH icon
60
Amphenol
APH
$210B
$105M 0.38%
3,201,536
+104,280
+3% +$3.2M
WMT icon
61
Walmart Inc
WMT
$923B
$104M 0.38%
2,168,016
+101,076
+5% +$4.91M
ITW icon
62
Illinois Tool Works
ITW
$83.3B
$101M 0.37%
497,697
+18,952
+4% +$3.87M
NOW icon
63
ServiceNow
NOW
$129B
$101M 0.37%
914,610
+55,615
+6% +$5.78M
VEA icon
64
Vanguard FTSE Developed Markets ETF
VEA
$238B
$99.7M 0.37%
2,111,231
-6,963
-0.3% -$306K
UNP icon
65
Union Pacific
UNP
$174B
$99M 0.36%
475,328
-2,665
-0.6% -$532K
GSHD icon
66
Goosehead Insurance
GSHD
$2.33B
$96.9M 0.36%
776,785
-9,955
-1% -$1.14M
ATVI
67
DELISTED
Activision Blizzard
ATVI
$93.4M 0.34%
1,005,855
+89,800
+10% +$7.29M
IVV icon
68
iShares Core S&P 500 ETF
IVV
$904B
$92M 0.34%
245,047
+11,889
+5% +$4.23M
CTAS icon
69
Cintas
CTAS
$81.4B
$91.1M 0.33%
1,031,496
+55,396
+6% +$4.81M
EXAS
70
DELISTED
Exact Sciences
EXAS
$91.1M 0.33%
687,567
-3,615
-0.5% -$437K
AME icon
71
Ametek
AME
$59.3B
$90.6M 0.33%
749,370
+3,494
+0.5% +$393K
NKE icon
72
Nike
NKE
$60.1B
$89M 0.33%
628,826
+191,754
+44% +$25.4M
AON icon
73
Aon
AON
$74.7B
$87.9M 0.32%
416,241
+59,118
+17% +$12.1M
BMY icon
74
Bristol-Myers Squibb
BMY
$130B
$86.6M 0.32%
1,395,428
+60,211
+5% +$3.7M
SMG icon
75
ScottsMiracle-Gro
SMG
$3.62B
$84.1M 0.31%
422,460
+13,993
+3% +$2.4M
1 2
3
4 5

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William Blair & Company's Q4 2020 Portfolio in Review

As of Q4 2020, William Blair & Company held 1,900 positions worth $27.3B, up 16% from $23.6B the previous quarter. Its ten largest holdings account for 25% of the portfolio.

William Blair & Company deployed $865M of net new capital in Q4 2020, opening 178 new positions and adding to 749 existing holdings. Its largest new stake was Seagen Inc. Common Stock: 91,539 shares worth $16M.

By sector, the portfolio is most concentrated in Technology at 28% of assets, up from 27% a quarter earlier, followed by Healthcare and Financials.

On the sell side, the largest reduction was Slack Technologies, Inc., an estimated $24.2M trimmed.

  • William Blair & Company's largest Q4 2020 buy was Seagen Inc. Common Stock: 91,539 shares worth $16M.
  • William Blair & Company added most to Splunk Inc in Q4 2020, an estimated $77.8M increase.
  • William Blair & Company's biggest Q4 2020 reduction was Slack Technologies, Inc., cutting an estimated $24.2M.
  • William Blair & Company fully exited Dunkin' Brands Group, Inc. in Q4 2020, selling an estimated $12.1M.
  • William Blair & Company's ten largest holdings make up 25% of its $27.3B portfolio in Q4 2020.
  • William Blair & Company opened 178 new positions and closed 72 in Q4 2020.
  • William Blair & Company's portfolio value rose 16% quarter-over-quarter to $27.3B.

Based on William Blair & Company's 13F filing for Q4 2020, filed 9 Feb 2021.