Simplex Trading Portfolio holdings
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.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
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 | |
|---|---|---|---|---|---|---|
2151
CALL
Teledyne Technologies
TDY
$30.4B
| $538K | ﹤0.01% |
26
+24
| +1,200% | +$5.25K |
|
2152
CALL
ManpowerGroup
MAN
$2.39B
| $537K | ﹤0.01% |
83
-16
| -16% | -$1.22K |
|
2153
CALL
Encompass Health
EHC
$11.2B
| $536K | ﹤0.01% |
109
+44
| +68% | +$2.5K |
|
2154
PUT
Hasbro
HAS
$12.6B
| $536K | ﹤0.01% |
66
+4
| +6% | +$372 |
|
2155
CALL
HealthEquity
HQY
$7.91B
| $536K | ﹤0.01% |
90
+15
| +20% | +$1.21K |
|
2156
PUT
Monster Beverage
MNST
$91.4B
| $536K | ﹤0.01% |
218
-488
| -69% | -$13.3K |
|
2157
CALL
KeyCorp
KEY
$24.3B
| $535K | ﹤0.01% |
362
-765
| -68% | -$13.5K |
|
2158
CALL
Enphase Energy
ENPH
$4.84B
| $534K | ﹤0.01% |
1,129
-208
| -16% | -$1.06K |
|
2159
Star Bulk Carriers
SBLK
$3.14B
| $534K | ﹤0.01% |
58,490
+4,883
| +9% | +$53.4K |
|
|
SIX
2160
PUT
DELISTED
Six Flags Entertainment Corp.
SIX
| $534K | ﹤0.01% |
96
+93
| +3,100% | +$5.56K |
|
2161
CALL
Deutsche Bank
DB
$66.3B
| $533K | ﹤0.01% |
654
-288
| -31% | -$2.81K |
|
2162
CALL
Insmed
INSM
$23.2B
| $533K | ﹤0.01% |
407
-138
| -25% | -$2.2K |
|
|
SPR
2163
PUT
DELISTED
Spirit AeroSystems
SPR
| $533K | ﹤0.01% |
74
+16
| +28% | +$1.3K |
|
|
GBT
2164
DELISTED
Global Blood Therapeutics, Inc.
GBT
| $533K | ﹤0.01% |
13,004
+2,986
| +30% | +$112K |
|
|
PRAH
2165
CALL
DELISTED
PRA Health Sciences, Inc.
PRAH
| $533K | ﹤0.01% |
58
+52
| +867% | +$5.26K |
|
|
SPTN
2166
PUT
DELISTED
SpartanNash
SPTN
| $532K | ﹤0.01% |
310
+213
| +220% | +$3.87K |
|
|
AVLR
2167
CALL
DELISTED
Avalara, Inc.
AVLR
| $532K | ﹤0.01% |
171
-56
| -25% | -$1.81K |
|
|
XENT
2168
CALL
DELISTED
Intersect ENT, Inc
XENT
| $532K | ﹤0.01% |
189
+4
| +2% | +$117 |
|
2169
CALL
British American Tobacco
BTI
$132B
| $531K | ﹤0.01% |
167
-98
| -37% | -$3.81K |
|
2170
Peabody Energy
BTU
$2.78B
| $531K | ﹤0.01% |
17,431
-151
| -0.9% | -$5.06K |
|
2171
CALL
Goosehead Insurance
GSHD
$1.39B
| $531K | ﹤0.01% |
202
+193
| +2,144% | +$5.37K |
|
2172
PUT
LPL Financial
LPLA
$26.3B
| $531K | ﹤0.01% |
87
-74
| -46% | -$4.51K |
|
|
ELLI
2173
DELISTED
Ellie Mae Inc
ELLI
| $531K | ﹤0.01% |
+8,465
| New | +$603K |
|
2174
PUT
DMC Global
BOOM
$121M
| $530K | ﹤0.01% |
151
-23
| -13% | -$836 |
|
2175
SolarEdge
SEDG
$2.59B
| $530K | ﹤0.01% |
15,105
-1,673
| -10% | -$64.1K |
|
Similar funds
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.