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 | |
|---|---|---|---|---|---|---|---|
| $15K | 0% | 7,244 +3,387 | +88% | +$7.01K | |||
| $15K | 0% | 2,257 +776 | +52% | +$5.16K | |||
| $15K | 0% | 6,392 | New | +$15K | |||
| $15K | 0% | 20,422 +1,509 | +8% | +$1.11K | |||
| $15K | 0% | 547 | New | +$15K | |||
| $15K | 0% | 674 | New | +$15K | |||
| $15K | 0% | 668 +468 | +234% | +$10.5K | |||
| $15K | 0% | 2,291 | New | +$15K | |||
| $15K | 0% | 3,397 -14,007 | -80% | -$61.9K | |||
| $15K | 0% | 652 +597 | +1,085% | +$13.7K | |||
| $15K | 0% | 4,613 -3,928 | -46% | -$12.8K | |||
| $14K | 0% | 146 -2,083 | -93% | -$200K | |||
| $14K | 0% | 4,162 -13,657 | -77% | -$45.9K | |||
| $14K | 0% | 800 | New | +$14K | |||
| $14K | 0% | 490 | New | +$14K | |||
| $14K | 0% | 8,804 +2,080 | +31% | +$3.31K | |||
| $14K | 0% | 1,278 -10,873 | -89% | -$119K | |||
| $14K | 0% | 513 | New | +$14K | |||
| $14K | 0% | 6,968 | New | +$14K | |||
| $14K | 0% | 2,806 +2,314 | +470% | +$11.5K | |||
| $14K | 0% | 22,677 -2,541 | -10% | -$1.57K | |||
| $14K | 0% | 1,695 | New | +$14K | |||
| $14K | 0% | 5,833 +3,239 | +125% | +$7.77K | |||
| $14K | 0% | 16,349 +16,022 | +4,900% | +$13.7K | |||
| $14K | 0% | 111 | New | +$14K |
