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 | |
|---|---|---|---|---|---|---|---|
| $22K | 0% | 1,156 -5,778 | -83% | -$110K | |||
| $22K | 0% | 491 -25,052 | -98% | -$1.12M | |||
| $22K | 0% | 472 | New | +$22K | |||
| $22K | 0% | 11,079 +9,774 | +749% | +$19.4K | |||
| $22K | 0% | 1,276 | New | +$22K | |||
| $21K | 0% | 738 | New | +$21K | |||
| $21K | 0% | 4,176 -3,818 | -48% | -$19.2K | |||
| $21K | 0% | 33,853 +33,346 | +6,577% | +$20.7K | |||
| $21K | 0% | 968 | New | +$21K | |||
| $21K | 0% | 375 | New | +$21K | |||
| $21K | 0% | 4,379 -22,103 | -83% | -$106K | |||
| $21K | 0% | 3,519 -9,992 | -74% | -$59.6K | |||
| $21K | 0% | 2,647 | New | +$21K | |||
| $21K | 0% | 9,813 | New | +$21K | |||
| $20K | 0% | 11,229 -638 | -5% | -$1.14K | |||
| $20K | 0% | 1,482 | New | +$20K | |||
| $20K | 0% | 3,443 -28,883 | -89% | -$168K | |||
| $20K | 0% | 296 -840 | -74% | -$56.8K | |||
| $20K | 0% | 482 -419 | -47% | -$17.4K | |||
| $20K | 0% | 1,812 | New | +$20K | |||
| $20K | 0% | 1,763 -11,917 | -87% | -$135K | |||
| $20K | 0% | 1,497 -12,506 | -89% | -$167K | |||
| $20K | 0% | 935 | New | +$20K | |||
| $20K | 0% | 95 -157 | -62% | -$33.1K | |||
| $20K | 0% | 16,121 -46,276 | -74% | -$57.4K |
