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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+2.14%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$860M
AUM Growth
+$34.4M
Cap. Flow
-$17.8M
Cap. Flow %
-2.07%
Top 10 Hldgs %
14.96%
Holding
6,670
New
1,973
Increased
1,386
Reduced
1,513
Closed
1,643

Top Buys

Rank Stock Value
1
GOOG icon
Alphabet (Google) Class C
GOOG
+$40.1M
2
BRK.B icon
Berkshire Hathaway Class B
BRK.B
+$12.5M
3
BABA icon
Alibaba
BABA
+$10.5M
4
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$9.89M
5
INTC icon
Intel
INTC
+$9.83M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$35.7M
2
GILD icon
Gilead Sciences
GILD
+$32.3M
3
AMZN icon
Amazon
AMZN
+$29M
4
BKNG icon
Booking.com
BKNG
+$28.4M
5
BIDU icon
Baidu
BIDU
+$13.3M

Sector Composition

Rank Sector Weight
1 Communication Services 7.76%
2 Consumer Discretionary 7.62%
3 Healthcare 7.24%
4 Technology 6.95%
5 Financials 4.83%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
KLAC icon
4126
CALL
KLA
KLAC
$266B
$2K ﹤0.01%
250
-760
-75% -$4.86K
KODK icon
4127
PUT
Kodak
KODK
$788M
$2K ﹤0.01%
45
-15
-25% -$285
KRO icon
4128
KRONOS Worldwide
KRO
$705M
$2K ﹤0.01%
193
+69
+56% +$839
LAB icon
4129
CALL
Standard BioTools
LAB
$303M
$2K ﹤0.01%
+16
New +$633
LAD icon
4130
PUT
Lithia Motors
LAD
$7.88B
$2K ﹤0.01%
122
+112
+1,120% +$10.1K
LEA icon
4131
PUT
Lear
LEA
$7.26B
$2K ﹤0.01%
14
+10
+250% +$1.05K
LFUS icon
4132
PUT
Littelfuse
LFUS
$10.2B
$2K ﹤0.01%
+37
New +$3.62K
LPSN icon
4133
PUT
LivePerson
LPSN
$20.8M
$2K ﹤0.01%
+1
New +$169
LUMN icon
4134
PUT
Lumen
LUMN
$6.45B
$2K ﹤0.01%
26
+3
+13% +$112
MAN icon
4135
CALL
ManpowerGroup
MAN
$2.5B
$2K ﹤0.01%
3
-5
-63% -$381
MAT icon
4136
CALL
Mattel
MAT
$4.3B
$2K ﹤0.01%
20
-14
-41% -$371
MCHP icon
4137
PUT
Microchip Technology
MCHP
$42.3B
$2K ﹤0.01%
46
-94
-67% -$2.27K
MDGL icon
4138
Madrigal Pharmaceuticals
MDGL
$12.7B
$2K ﹤0.01%
30
+1
+3% +$86
MFIN icon
4139
PUT
Medallion Financial
MFIN
$226M
$2K ﹤0.01%
+17
New +$168
MHK icon
4140
PUT
Mohawk Industries
MHK
$7.05B
$2K ﹤0.01%
9
-36
-80% -$6.23K
MHO icon
4141
M/I Homes
MHO
$3.81B
$2K ﹤0.01%
+93
New +$2.04K
MITT
4142
TPG Mortgage Investment Trust
MITT
$233M
$2K ﹤0.01%
+46
New +$2.57K
MLCO icon
4143
CALL
Melco Resorts & Entertainment
MLCO
$2.18B
$2K ﹤0.01%
174
-656
-79% -$15.7K
MLKN icon
4144
MillerKnoll
MLKN
$1.54B
$2K ﹤0.01%
+100
New +$2.93K
MMLP icon
4145
CALL
Martin Midstream Partners
MMLP
$98.6M
$2K ﹤0.01%
+110
New +$3.38K
MRC
4146
PUT
DELISTED
MRC Global
MRC
$2K ﹤0.01%
+9
New +$112
MSTR icon
4147
PUT
Strategy Inc
MSTR
$36B
$2K ﹤0.01%
+130
New +$2.19K
MTB icon
4148
CALL
M&T Bank
MTB
$36B
$2K ﹤0.01%
18
-19
-51% -$2.3K
MTB icon
4149
PUT
M&T Bank
MTB
$36B
$2K ﹤0.01%
25
+13
+108% +$1.57K
MUR icon
4150
CALL
Murphy Oil
MUR
$5.38B
$2K ﹤0.01%
14
-68
-83% -$3.29K
164 165
166
167 168

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Simplex Trading's Q1 2015 Portfolio in Review

As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.

Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.

By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.

  • Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
  • Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
  • Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
  • Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
  • Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
  • Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
  • Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.

Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.