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 |
Gilead Sciences
GILD
|
+$33M |
| 2 |
Apple
AAPL
|
+$32.5M |
| 3 |
Booking.com
BKNG
|
+$28.7M |
| 4 |
Amazon
AMZN
|
+$25.7M |
| 5 |
Baidu
BIDU
|
+$16.3M |
Top Sells
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 13.8% |
| 2 | Technology | 11.13% |
| 3 | Healthcare | 8.34% |
| 4 | Energy | 5.42% |
| 5 | Communication Services | 4.79% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
101
PUT
Kinder Morgan
KMI
$72.5B
| $1.32M | 0.16% |
+3,167
| New | +$125K |
|
|
DO
102
DELISTED
Diamond Offshore Drilling
DO
| $1.32M | 0.16% |
+35,853
| New | +$1.28M |
|
103
F5
FFIV
$23.2B
| $1.31M | 0.16% |
+10,079
| New | +$1.26M |
|
104
CALL
AbbVie
ABBV
$448B
| $1.31M | 0.16% |
+1,265
| New | +$79.8K |
|
105
Copa Holdings
CPA
$5.75B
| $1.31M | 0.16% |
+12,625
| New | +$1.34M |
|
106
CALL
Vertex Pharmaceuticals
VRTX
$122B
| $1.3M | 0.16% |
+316
| New | +$35.6K |
|
|
WFM
107
CALL
DELISTED
Whole Foods Market Inc
WFM
| $1.28M | 0.16% |
+1,162
| New | +$51.2K |
|
|
EMES
108
PUT
DELISTED
Emerge Energy Services LP
EMES
| $1.27M | 0.15% |
+463
| New | +$34.7K |
|
109
eBay
EBAY
$50.7B
| $1.26M | 0.15% |
+53,391
| New | +$1.21M |
|
110
GoPro
GPRO
$118M
| $1.24M | 0.15% |
+19,583
| New | +$1.44M |
|
111
CALL
Cheniere Energy
LNG
$55.5B
| $1.22M | 0.15% |
+2,805
| New | +$198K |
|
112
Vipshop
VIPS
$7.01B
| $1.21M | 0.15% |
+62,062
| New | +$1.31M |
|
|
SCTY
113
PUT
DELISTED
SolarCity Corporation
SCTY
| $1.21M | 0.15% |
+1,187
| New | +$63.7K |
|
|
114
CALL
Kinder Morgan
KMI
$72.5B
| $1.2M | 0.15% |
+2,617
| New | +$103K |
|
115
First Solar
FSLR
$22.1B
| $1.2M | 0.15% |
+26,955
| New | +$1.37M |
|
116
PUT
Meta Platforms (Facebook)
META
$1.63T
| $1.2M | 0.15% |
+2,408
| New | +$184K |
|
117
Medtronic
MDT
$107B
| $1.18M | 0.14% |
+16,400
| New | +$1.14M |
|
118
Mohawk Industries
MHK
$6.58B
| $1.18M | 0.14% |
+7,564
| New | +$1.09M |
|
119
United Rentals
URI
$63.4B
| $1.17M | 0.14% |
+11,460
| New | +$1.23M |
|
120
Eli Lilly
LLY
$1.02T
| $1.17M | 0.14% |
+16,921
| New | +$1.14M |
|
|
RFMD
121
CALL
DELISTED
RF MICRO DEVICES INC
RFMD
| $1.16M | 0.14% |
+1,822
| New | +$24.3K |
|
122
VanEck Gold Miners ETF
GDX
$22.7B
| $1.16M | 0.14% |
+63,253
| New | +$1.22M |
|
123
PUT
3D Systems Corp
DDD
$430M
| $1.14M | 0.14% |
+990
| New | +$35.7K |
|
124
Wabtec
WAB
$43.8B
| $1.14M | 0.14% |
+13,101
| New | +$1.1M |
|
|
OVTI
125
DELISTED
OMNIVISION TECHNOLOGIES INC
OVTI
| $1.13M | 0.14% |
+43,397
| New | +$1.15M |
|
Similar funds
Simplex Trading's Q4 2014 Portfolio in Review
Q4 2014 is the first quarter with a 13F filing on record for Simplex Trading, which disclosed 4,682 positions worth $826M. Its ten largest holdings account for 23% of the portfolio.
Its largest position is Gilead Sciences: 319,426 shares worth $30.1M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, followed by Technology and Healthcare.
- Simplex Trading's largest Q4 2014 buy was Gilead Sciences: 319,426 shares worth $30.1M.
- Simplex Trading's ten largest holdings make up 23% of its $826M portfolio in Q4 2014.
- Simplex Trading disclosed 4,682 positions in Q4 2014, its first 13F filing on record.
Based on Simplex Trading's 13F filing for Q4 2014, filed 4 Mar 2015.