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 | |
|---|---|---|---|---|---|---|---|
| $5K | 0% | 236 +71 | +43% | +$1.5K | |||
| $5K | 0% | 505 | New | +$5K | |||
| $5K | 0% | 22,894 -10,835 | -32% | -$2.37K | |||
| $5K | 0% | 168 | New | +$5K | |||
| $5K | 0% | 1,154 +857 | +289% | +$3.71K | |||
| $5K | 0% | 198 | New | +$5K | |||
| $5K | 0% | 41 -296 | -88% | -$36.1K | |||
| $5K | 0% | 177 +27 | +18% | +$763 | |||
| $5K | 0% | 100 | New | +$5K | |||
| $5K | 0% | 387 -524 | -58% | -$6.77K | |||
| $5K | 0% | 935 +869 | +1,317% | +$4.65K | |||
| $5K | 0% | 789 -115,838 | -99% | -$734K | |||
| $5K | 0% | 155 | New | +$5K | |||
| $5K | 0% | 39 +12 | +44% | +$1.54K | |||
| $5K | 0% | 219 | New | +$5K | |||
| $5K | 0% | 496 | New | +$5K | |||
| $5K | 0% | 446 | New | +$5K | |||
| $5K | 0% | 1,812 -245 | -12% | -$676 | |||
| $5K | 0% | 210 -242 | -54% | -$5.76K | |||
| $5K | 0% | 593 -5,338 | -90% | -$45K | |||
| $5K | 0% | 288 | New | +$5K | |||
| $5K | 0% | 268 | New | +$5K | |||
| $4K | 0% | 6,230 +5,317 | +582% | +$3.41K | |||
| $4K | 0% | 382 | New | +$4K | |||
| $4K | 0% | 4,304 +860 | +25% | +$799 |
