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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
SPXS icon
1826
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$333M
– –
-11
Closed -$6K
SQQQ icon
1827
ProShares UltraPro Short QQQ
SQQQ
$1.73B
– –
-1
Closed -$3K
SRS icon
1828
ProShares UltraShort Real Estate
SRS
$16.1M
$0 ﹤0.01%
+1
New +$107
TBX icon
1829
ProShares Short 7-10 Year Treasury
TBX
$20.9M
– –
-511
Closed -$12K
TDTT icon
1830
FlexShares iBoxx 3-Year Target Duration TIPS Index Fund
TDTT
$2.53B
– –
-1,506
Closed -$39K
WFC.PRL icon
1831
Wells Fargo 7.5% Non Cumv Perp Conv
WFC.PRL
$4.65B
– –
-147
Closed -$197K
WFH
1832
DELISTED
Direxion Work From Home ETF
WFH
– –
-274
Closed -$15K
GOEVW
1833
DELISTED
Canoo Inc. Warrant
GOEVW
– –
-187,500
Closed -$433K
TUP
1834
DELISTED
Tupperware Brands Corporation
TUP
– –
-15,577
Closed -$314K
KA
1835
DELISTED
Kineta, Inc. Common Stock
KA
– –
-118
Closed -$18K
GOEV
1836
DELISTED
Canoo Inc. Class A Common Stock
GOEV
– –
-328
Closed -$1.68M
NEPT
1837
DELISTED
Neptune Wellness Solutions Inc. Ordinary Shares
NEPT
– –
-7
Closed -$21K
MDRX
1838
DELISTED
Veradigm Inc. Common Stock
MDRX
– –
-16,945
Closed -$138K
NVTA
1839
DELISTED
Invitae Corporation
NVTA
– –
-4,750
Closed -$206K
TDW.WS.A
1840
DELISTED
Tidewater Inc. Series A Warrants to purchase shares of common stock (expiring July 31, 2023)
TDW.WS.A
$0 ﹤0.01%
43
– –
TDW.WS.B
1841
DELISTED
Tidewater Inc. Series B Warrants to purchase shares of common stock (expiring July 31, 2023)
TDW.WS.B
$0 ﹤0.01%
46
– –
ACOR
1842
DELISTED
Acorda Therapeutics
ACOR
– –
-1,192
Closed -$74K
VIVO
1843
DELISTED
Meridian Bioscience Inc
VIVO
– –
-18,319
Closed -$311K
IEA
1844
DELISTED
Infrastructure and Energy Alternatives, Inc. Common Stock
IEA
– –
-23,000
Closed -$137K
CDR
1845
DELISTED
Cedar Realty Trust, Inc
CDR
– –
-3,030
Closed -$16K
DHR.PRA
1846
DELISTED
Danaher Corporation 4.75% Mandatory Convertible Preferred Stock, Series A
DHR.PRA
– –
-25
Closed -$37K
LMRKN
1847
DELISTED
Landmark Infrastructure Partners LP 7% Series C Fltg/Fxd Perpetual Conv Preferred Stock
LMRKN
– –
-800
Closed -$19K
NEOS
1848
DELISTED
Neos Therapeutics, Inc
NEOS
– –
-13,400
Closed -$7K
CXO
1849
DELISTED
CONCHO RESOURCES INC.
CXO
– –
-5,185
Closed -$229K
BMY.RT
1850
DELISTED
Bristol-Myers Squibb Company Contingent Value Rights
BMY.RT
– –
-176,220
Closed -$396K
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.