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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
+6.87%
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
$2.45B
AUM Growth
+$147M
Cap. Flow
+$26.3M
Cap. Flow %
1.07%
Top 10 Hldgs %
23.61%
Holding
7,357
New
1,313
Increased
2,078
Reduced
2,339
Closed
1,500

Top Buys

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$45.9M
2
IWM icon
iShares Russell 2000 ETF
IWM
+$30.1M
3
TWX
Time Warner Inc
TWX
+$25.8M
4
BKNG icon
Booking.com
BKNG
+$22.5M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$17.7M

Top Sells

Rank Stock Value
1
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$43.6M
2
AMGN icon
Amgen
AMGN
+$33.2M
3
BIDU icon
Baidu
BIDU
+$19.3M
4
GOOGL icon
Alphabet (Google) Class A
GOOGL
+$17.3M
5
MU icon
Micron Technology
MU
+$17.1M

Sector Composition

Rank Sector Weight
1 Consumer Discretionary 14.31%
2 Technology 13.17%
3 Communication Services 11.81%
4 Healthcare 4.06%
5 Financials 3.84%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
KG
6326
CALL
Kestrel Group
KG
$71.3M
– –
-13
Closed -$3K
MHO icon
6327
CALL
M/I Homes
MHO
$3.76B
– –
-81
Closed -$1K
MIND icon
6328
CALL
MIND Technology
MIND
$50M
– –
-3
Closed -$1K
MITK icon
6329
Mitek Systems
MITK
$718M
– –
-7,124
Closed -$69.6K
MKL icon
6330
CALL
Markel Group
MKL
$24.5B
– –
-7
Closed -$3K
MKSI icon
6331
MKS Inc
MKSI
$23.3B
– –
-5,868
Closed -$480K
MKTX icon
6332
MarketAxess Holdings
MKTX
$4.06B
– –
-2,047
Closed -$392K
MKTX icon
6333
PUT
MarketAxess Holdings
MKTX
$4.06B
– –
-40
Closed -$7K
MLKN icon
6334
CALL
MillerKnoll
MLKN
$1.46B
– –
-136
Closed -$14K
MMI icon
6335
CALL
Marcus & Millichap
MMI
$1.13B
– –
-26
Closed -$5K
MMSI icon
6336
CALL
Merit Medical Systems
MMSI
$4.36B
– –
-16
Closed -$7K
MMYT icon
6337
CALL
MakeMyTrip
MMYT
$4.67B
– –
-38
Closed -$6K
CALY
6338
PUT
Callaway Golf Company
CALY
$3.22B
– –
-214
Closed -$5K
MOH icon
6339
Molina Healthcare
MOH
$10.4B
– –
-4,775
Closed -$311K
MOH icon
6340
PUT
Molina Healthcare
MOH
$10.4B
– –
-66
Closed -$29K
MPAA icon
6341
Motorcar Parts of America
MPAA
$256M
– –
-290
Closed -$7.86K
MPC icon
6342
Marathon Petroleum
MPC
$91.2B
– –
-38,171
Closed -$2.05M
MPLX icon
6343
MPLX
MPLX
$58.4B
– –
-11,940
Closed -$412K
MPWR icon
6344
Monolithic Power Systems
MPWR
$68.6B
– –
-1,764
Closed -$179K
MPWR icon
6345
PUT
Monolithic Power Systems
MPWR
$68.6B
– –
-57
Closed -$8K
MPX
6346
CALL
DELISTED
Marine Products Corp
MPX
– –
-15
Closed -$3K
MRTN icon
6347
Marten Transport
MRTN
$1.38B
– –
-690
Closed -$7K
MSA icon
6348
Mine Safety
MSA
$6.72B
– –
-62
Closed -$4.64K
MSCI icon
6349
MSCI
MSCI
$40.2B
– –
-2,463
Closed -$273K
MSEX icon
6350
CALL
Middlesex Water
MSEX
$1.05B
– –
-19
Closed -$5K
252 253
254
255 256

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Simplex Trading's Q3 2017 Portfolio in Review

As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.

Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.

By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.

  • Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
  • Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
  • Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
  • Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
  • Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
  • Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
  • Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.

Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.