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 | |
|---|---|---|---|---|---|---|---|
| $77K | 0% | 14,358 | New | +$77K | |||
| $77K | 0% | 1,430 +1,299 | +992% | +$69.9K | |||
| $77K | 0% | 1,781 | New | +$77K | |||
| $77K | 0% | 7,963 +7,008 | +734% | +$67.8K | |||
| $76K | 0% | 30,624 +30,277 | +8,725% | +$75.1K | |||
| $76K | 0% | 2,880 +450 | +19% | +$11.9K | |||
| $76K | 0% | 2,326 | New | +$76K | |||
| $76K | 0% | 1,500 | New | +$76K | |||
| $76K | 0% | 783 +65 | +9% | +$6.31K | |||
| $76K | 0% | 81,681 +57,001 | +231% | +$53K | |||
| $76K | 0% | 654 +386 | +144% | +$44.9K | |||
| $75K | 0% | 7,683 -52,256 | -87% | -$510K | |||
| $75K | 0% | 2,048 -419 | -17% | -$15.3K | |||
| $75K | 0% | 15,540 | New | +$75K | |||
| $75K | 0% | 626 -14,351 | -96% | -$1.72M | |||
| $75K | 0% | 2,959 | New | +$75K | |||
| $75K | 0% | 1,254 -19,398 | -94% | -$1.16M | |||
| $74K | 0% | 474 +238 | +101% | +$37.2K | |||
| $74K | 0% | 900 -2,405 | -73% | -$198K | |||
| $74K | 0% | 4,383 -14,474 | -77% | -$244K | |||
| $74K | 0% | 2,137 +1,101 | +106% | +$38.1K | |||
| $73K | 0% | 6,189 | New | +$73K | |||
| $73K | 0% | 778 | New | +$73K | |||
| $72K | 0% | 928 -2,066 | -69% | -$160K | |||
| $72K | 0% | 12,846 -2,444 | -16% | -$13.7K |
