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 | |
|---|---|---|---|---|---|---|---|
| $31K | 0% | 6,756 | New | +$31K | |||
| $31K | 0% | 1,594 | New | +$31K | |||
| $31K | 0% | 24,952 +24,276 | +3,591% | +$30.2K | |||
| $31K | 0% | 3,394 -12,751 | -79% | -$116K | |||
| $31K | 0% | 89 | New | +$31K | |||
| $31K | 0% | 124 | New | +$31K | |||
| $31K | 0% | 1,525 -3,163 | -67% | -$64.3K | |||
| $30K | 0% | 20,184 | New | +$30K | |||
| $30K | 0% | 7,738 | New | +$30K | |||
| $30K | 0% | 5,900 | New | +$30K | |||
| $30K | 0% | 13,223 | New | +$30K | |||
| $30K | 0% | 710 +693 | +4,076% | +$29.3K | |||
| $30K | 0% | 1,680 +1,589 | +1,746% | +$28.4K | |||
| $30K | 0% | 4,970 +4,909 | +8,048% | +$29.6K | |||
| $30K | 0% | 386 -3,137 | -89% | -$244K | |||
| $30K | 0% | 1,901 | New | +$30K | |||
| $29K | 0% | 266 | New | +$29K | |||
| $29K | 0% | 21,423 -19,883 | -48% | -$26.9K | |||
| $29K | 0% | 897 | New | +$29K | |||
| $29K | 0% | 82,346 +81,771 | +14,221% | +$28.8K | |||
| $29K | 0% | 2,270 +526 | +30% | +$6.72K | |||
| $29K | 0% | 28,277 -152,005 | -84% | -$156K | |||
| $29K | 0% | 3,733 +49 | +1% | +$381 | |||
| $29K | 0% | 5,634 -7,042 | -56% | -$36.2K | |||
| $28K | 0% | 972 +287 | +42% | +$8.27K |
