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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
IWF icon
1801
iShares Russell 1000 Growth ETF
IWF
$128B
$0 ﹤0.01%
340,808
+10,728
+3% +$611K
IXC icon
1802
iShares Global Energy ETF
IXC
$2.74B
– –
-472
Closed -$8K
JEF icon
1803
Jefferies Financial Group
JEF
$12.6B
– –
-10,738
Closed -$185K
KN icon
1804
Knowles
KN
$3.33B
$0 ﹤0.01%
12
– –
LTPZ icon
1805
PIMCO 15+ Year US TIPS Index Exchange-Traded Fund
LTPZ
$741M
– –
-7
Closed -$1K
NANR icon
1806
State Street SPDR S&P North American Natural Resources ETF
NANR
$812M
– –
-46
Closed -$1K
NYT icon
1807
New York Times
NYT
$10.3B
– –
-21,167
Closed -$906K
OFS icon
1808
OFS Capital
OFS
$48.6M
– –
-29,947
Closed -$141K
ON icon
1809
ON Semiconductor
ON
$32.4B
– –
-3,166
Closed -$69K
PEJ icon
1810
Invesco Leisure and Entertainment ETF
PEJ
$312M
– –
-800
Closed -$26K
PSCH icon
1811
Invesco S&P SmallCap Health Care ETF
PSCH
$172M
– –
-759
Closed -$33K
PXH icon
1812
Invesco FTSE RAFI Emerging Markets ETF
PXH
$1.97B
$0 ﹤0.01%
+2
New +$39
QID icon
1813
ProShares UltraShort QQQ
QID
$247M
– –
0
– –
REM icon
1814
iShares Mortgage Real Estate ETF
REM
$543M
– –
-1,305
Closed -$34K
ROG icon
1815
Rogers Corp
ROG
$2.48B
– –
-2,552
Closed -$250K
RSPU icon
1816
Invesco S&P 500 Equal Weight Utilities ETF
RSPU
$534M
– –
-220
Closed -$10K
RXI icon
1817
iShares Global Consumer Discretionary ETF
RXI
$274M
– –
-75
Closed -$10K
SCHZ icon
1818
Schwab US Aggregate Bond ETF
SCHZ
$10.5B
– –
-3,170
Closed -$89K
SDOG icon
1819
ALPS Sector Dividend Dogs ETF
SDOG
$1.44B
– –
-930
Closed -$35K
SDOW icon
1820
ProShares UltraPro Short Dow 30
SDOW
$185M
– –
-28
Closed -$8K
SIVR icon
1821
abrdn Physical Silver Shares ETF
SIVR
$4.53B
– –
-23,031
Closed -$518K
SMFG icon
1822
Sumitomo Mitsui Financial
SMFG
$166B
– –
-10,365
Closed -$58K
SMSI icon
1823
Smith Micro Software
SMSI
$17M
– –
-1,128
Closed -$168K
SNSR icon
1824
Global X Internet of Things ETF
SNSR
$224M
– –
-13,208
Closed -$346K
SPOT icon
1825
Spotify
SPOT
$101B
– –
-1,345
Closed -$326K
71 72
73
74 75

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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.