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
| 1 | $278M | |
| 2 | $84.4M | |
| 3 | $76.9M | |
| 4 | $74.9M | |
| 5 | $53.5M |
Top Sells
| 1 | $497M | |
| 2 | $73.7M | |
| 3 | $41.8M | |
| 4 | $18.2M | |
| 5 | $16.9M |
Sector Composition
| 1 | Technology | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $11K | 0% | 500 | New | +$11K | |||
| $11K | 0% | 73 | New | +$11K | |||
| $11K | 0% | 306 | New | +$11K | |||
| $11K | 0% | 1,482 -2,285 | -61% | -$17K | |||
| $10K | 0% | 1,948 +1,724 | +770% | +$8.85K | |||
| $10K | 0% | 272 | New | +$10K | |||
| $10K | 0% | 4,731 | New | +$10K | |||
| $10K | 0% | 368 | New | +$10K | |||
| $10K | 0% | 1,519 | New | +$10K | |||
| $10K | 0% | 6,812 -4,621 | -40% | -$6.78K | |||
| $10K | 0% | 1,664 +27 | +2% | +$162 | |||
| $10K | 0% | 658 -1,841 | -74% | -$28K | |||
| $10K | 0% | 55 -1,840 | -97% | -$335K | |||
| $10K | 0% | 300 | New | +$10K | |||
| $10K | 0% | 816 -589 | -42% | -$7.22K | |||
| $10K | 0% | 518 | New | +$10K | |||
| $10K | 0% | 130 +114 | +713% | +$8.77K | |||
| $10K | 0% | 6,728 | New | +$10K | |||
| $10K | 0% | 400 -2,937 | -88% | -$73.4K | |||
| $10K | 0% | 159 | New | +$10K | |||
| $10K | 0% | 5,130 -53,021 | -91% | -$103K | |||
| $10K | 0% | 693 | New | +$10K | |||
| $10K | 0% | 855 -934 | -52% | -$10.9K | |||
| $10K | 0% | 52,218 +8,292 | +19% | +$1.59K | |||
| $10K | 0% | 1,109 | New | +$10K |
