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 | |
|---|---|---|---|---|---|---|---|
| $1K | 0% | 232 -279 | -55% | -$1.2K | |||
| $1K | 0% | 78 | New | +$1K | |||
| $1K | 0% | 12 -35 | -74% | -$2.92K | |||
| $1K | 0% | 88 +18 | +26% | +$205 | |||
| $1K | 0% | 167 | New | +$1K | |||
| $1K | 0% | 3,059 +1,943 | +174% | +$635 | |||
| $1K | 0% | 58 | New | +$1K | |||
| $1K | 0% | 230 -1,958 | -89% | -$8.51K | |||
| $1K | 0% | 4,482 | New | +$1K | |||
| $1K | 0% | 161 +100 | +164% | +$621 | |||
| $1K | 0% | 76 | New | +$1K | |||
| $1K | 0% | 712 -1,765 | -71% | -$2.48K | |||
| $1K | 0% | 134 | New | +$1K | |||
| $1K | 0% | 348 -7,215 | -95% | -$20.7K | |||
| $1K | 0% | 46 | New | +$1K | |||
| $1K | 0% | 1,300 -5,511 | -81% | -$4.24K | |||
| $1K | 0% | 194 | New | +$1K | |||
| $1K | 0% | 174 | New | +$1K | |||
| $1K | 0% | 18 | New | +$1K | |||
| $1K | 0% | 77 -3,062 | -98% | -$39.8K | |||
| $1K | 0% | 13 -1,038 | -99% | -$79.8K | |||
| $1K | 0% | 71 -486 | -87% | -$6.85K | |||
| $1K | 0% | 817 | New | +$1K | |||
| $1K | 0% | 664 -625 | -48% | -$941 | |||
| $1K | 0% | 70 | New | +$1K |
