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 | |
|---|---|---|---|---|---|---|---|
| $4K | 0% | 2,966 | New | +$4K | |||
| $4K | 0% | 338 -587 | -63% | -$6.95K | |||
| $4K | 0% | 3,061 | New | +$4K | |||
| $4K | 0% | 52 | New | +$4K | |||
| $4K | 0% | 571 | New | +$4K | |||
| $4K | 0% | 1,370 | New | +$4K | |||
| $4K | 0% | 7,091 -95,985 | -93% | -$54.1K | |||
| $4K | 0% | 253 | New | +$4K | |||
| $4K | 0% | 96 | New | +$4K | |||
| $4K | 0% | 77 | New | +$4K | |||
| $4K | 0% | 147 | New | +$4K | |||
| $4K | 0% | 178 +143 | +409% | +$3.21K | |||
| $4K | 0% | 105 +104 | +10,400% | +$3.96K | |||
| $4K | 0% | 134 +71 | +113% | +$2.12K | |||
| $4K | 0% | 453 | New | +$4K | |||
| $4K | 0% | 240 | New | +$4K | |||
| $4K | 0% | 497 -654 | -57% | -$5.26K | |||
| $4K | 0% | 58 | – | – | |||
| $4K | 0% | 189 -330 | -64% | -$6.98K | |||
| $4K | 0% | 55 -6,473 | -99% | -$471K | |||
| $4K | 0% | 241 | New | +$4K | |||
| $4K | 0% | 6,605 -3,309 | -33% | -$2K | |||
| $4K | 0% | 202 | New | +$4K | |||
| $3K | 0% | 75 | New | +$3K | |||
| $3K | 0% | 70 | – | – |
