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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
-18.41%
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
$34.1B
AUM Growth
+$2.94B
Cap. Flow
-$379M
Cap. Flow %
-1.11%
Top 10 Hldgs %
42.6%
Holding
8,576
New
1,199
Increased
2,701
Reduced
2,877
Closed
1,573

Top Buys

Rank Stock Value
1
IWM icon
iShares Russell 2000 ETF
IWM
+$58.5M
2
GOOG icon
Alphabet (Google) Class C
GOOG
+$56.5M
3
SPY icon
State Street SPDR S&P 500 ETF Trust
SPY
+$44.1M
4
AAPL icon
Apple
AAPL
+$20.3M
5
XOP icon
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
+$12.7M

Top Sells

Rank Stock Value
1
AMZN icon
Amazon
AMZN
+$109M
2
META icon
Meta Platforms (Facebook)
META
+$62.3M
3
QQQ icon
Invesco QQQ Trust
QQQ
+$36.2M
4
GS icon
Goldman Sachs
GS
+$27.1M
5
BA icon
Boeing
BA
+$24.7M

Sector Composition

Rank Sector Weight
1 Communication Services 0.49%
2 Consumer Discretionary 0.48%
3 Technology 0.4%
4 Financials 0.25%
5 Industrials 0.22%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
CMCSA icon
7076
Comcast
CMCSA
$79.1B
– –
-81,452
Closed -$2.97M
CME icon
7077
CME Group
CME
$92.2B
– –
-3,617
Closed -$668K
CMPR icon
7078
Cimpress
CMPR
$2.37B
– –
-1,671
Closed -$194K
CMS icon
7079
CALL
CMS Energy
CMS
$23.1B
– –
-2
Closed -$9K
CMS icon
7080
PUT
CMS Energy
CMS
$23.1B
– –
-6
Closed -$29K
CMTL icon
7081
Comtech Telecommunications
CMTL
$51.8M
– –
-603
Closed -$16.9K
CNI icon
7082
Canadian National Railway
CNI
$78.3B
– –
-2,967
Closed -$246K
CNK icon
7083
Cinemark Holdings
CNK
$3.82B
– –
-302
Closed -$11.9K
CNMD icon
7084
CALL
CONMED
CNMD
$1.29B
– –
-2
Closed -$15K
CNMD icon
7085
CONMED
CNMD
$1.29B
– –
-4,237
Closed -$335K
CNMD icon
7086
PUT
CONMED
CNMD
$1.29B
– –
-86
Closed -$681K
CNO icon
7087
CALL
CNO Financial Group
CNO
$4.97B
– –
-42
Closed -$89K
CODI icon
7088
Compass Diversified
CODI
$755M
– –
-1,423
Closed -$21.9K
COF icon
7089
Capital One
COF
$124B
– –
-30,825
Closed -$2.67M
COHU icon
7090
CALL
Cohu
COHU
$2.39B
– –
-7
Closed -$17K
COHU icon
7091
Cohu
COHU
$2.39B
– –
-2,455
Closed -$46.8K
COHU icon
7092
PUT
Cohu
COHU
$2.39B
– –
-17
Closed -$42K
VISN
7093
Vistance Networks Inc
VISN
$2.66B
– –
-4,218
Closed -$89.4K
CORT icon
7094
Corcept Therapeutics
CORT
$10.2B
– –
-1,229
Closed -$16.2K
CPB icon
7095
Campbell Soup
CPB
$6.51B
– –
-52,485
Closed -$1.99M
CPRT icon
7096
CALL
Copart
CPRT
$25.9B
– –
-1,060
Closed -$1.36M
CPRX
7097
PUT
DELISTED
Catalyst Pharmaceutical
CPRX
– –
-4
Closed -$1K
CPT icon
7098
CALL
Camden Property Trust
CPT
$11.3B
– –
-10
Closed -$93K
CRIS icon
7099
CALL
Curis
CRIS
$9.53M
– –
0
– -$5K
CRK icon
7100
Comstock Resources
CRK
$3.97B
– –
-24,969
Closed -$183K
282 283
284
285 286

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Simplex Trading's Q4 2018 Portfolio in Review

As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.

By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.

  • Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
  • Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
  • Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
  • Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
  • Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
  • Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
  • Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.

Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.