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 | Miscellaneous | 45.44% |
| 2 | Consumer Discretionary | 13.94% |
| 3 | Technology | 11.28% |
| 4 | Healthcare | 8.62% |
| 5 | Energy | 5.8% |
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 Miscellaneous at 45% of assets, followed by Consumer Discretionary and Technology.
- 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.