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 | |
|---|---|---|---|---|---|---|---|
| $379K | 0% | 13,215 | New | +$379K | |||
| $379K | 0% | 6,522 | New | +$379K | |||
| $378K | 0% | 34,533 +33,829 | +4,805% | +$370K | |||
| $377K | 0% | 162,223 -8,491 | -5% | -$19.7K | |||
| $377K | 0% | 68,180 +44,986 | +194% | +$249K | |||
| $376K | 0% | 42,709 -6,890 | -14% | -$60.7K | |||
| $374K | 0% | 702 | New | +$374K | |||
| $373K | 0% | 102,210 +90,690 | +787% | +$331K | |||
| $372K | 0% | 21,621 +19,310 | +836% | +$332K | |||
| $371K | 0% | 74,531 -63,349 | -46% | -$315K | |||
| $370K | 0% | 2,238 +468 | +26% | +$77.4K | |||
| $368K | 0% | 7,716 | New | +$368K | |||
| $366K | 0% | 49,962 -43,511 | -47% | -$319K | |||
| $366K | 0% | 31,968 -130,432 | -80% | -$1.49M | |||
| $365K | 0% | 3,988 -1,040 | -21% | -$95.2K | |||
| $365K | 0% | 3,976 | New | +$365K | |||
| $364K | 0% | 7,688 +7,425 | +2,823% | +$352K | |||
| $364K | 0% | 3,831 | New | +$364K | |||
| $359K | 0% | 24,795 -44,057 | -64% | -$638K | |||
| $357K | 0% | 17,904 +9,840 | +122% | +$196K | |||
| $356K | 0% | 5,874 -33,892 | -85% | -$2.05M | |||
| $356K | 0% | 20,604 +3,258 | +19% | +$56.3K | |||
| $356K | 0% | 16,818 | New | +$356K | |||
| $355K | 0% | 6,850 +686 | +11% | +$35.6K | |||
| $351K | 0% | 4,911 +2,564 | +109% | +$183K |
