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 | 23.04% |
| 2 | Consumer Discretionary | 11.84% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.77% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $40K | 0% | 788 | New | +$40K | |||
| $40K | 0% | 444 -344 | -44% | -$31K | |||
| $40K | 0% | 1,542 -4,699 | -75% | -$122K | |||
| $40K | 0% | 17,300 -7,744 | -31% | -$17.9K | |||
| $40K | 0% | 2,434 +2,300 | +1,716% | +$37.8K | |||
| $40K | 0% | 356 | New | +$40K | |||
| $40K | 0% | 12,301 -34,080 | -73% | -$111K | |||
| $40K | 0% | 2,114 | New | +$40K | |||
| $39K | 0% | 5,318 -5,079 | -49% | -$37.2K | |||
| $39K | 0% | 3,749 +1,562 | +71% | +$16.2K | |||
| $39K | 0% | 1,548 | New | +$39K | |||
| $39K | 0% | 65 -1,418 | -96% | -$851K | |||
| $39K | 0% | 3,018 | New | +$39K | |||
| $38K | 0% | 975 +20 | +2% | +$779 | |||
| $38K | 0% | 1,003 | New | +$38K | |||
| $38K | 0% | 13,423 +3,765 | +39% | +$10.7K | |||
| $38K | 0% | 84,616 | New | +$38K | |||
| $38K | 0% | 18,697 +14,773 | +376% | +$30K | |||
| $38K | 0% | 1,226 | New | +$38K | |||
| $38K | 0% | 437 -3,390 | -89% | -$295K | |||
| $38K | 0% | 503 | New | +$38K | |||
| $37K | 0% | 3,044 +1,827 | +150% | +$22.2K | |||
| $37K | 0% | 13,476 +6,076 | +82% | +$16.7K | |||
| $37K | 0% | 3,443 +2,856 | +487% | +$30.7K | |||
| $37K | 0% | 2,275 -54 | -2% | -$878 |
