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 | $216M | |
| 2 | $159M | |
| 3 | $128M | |
| 4 | $62.2M | |
| 5 | $61.9M |
Top Sells
| 1 | $141M | |
| 2 | $53.1M | |
| 3 | $45.7M | |
| 4 | $45.3M | |
| 5 | $38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.4% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $31K | ﹤0.01% | +16,943 | New | +$31K | |||
| $31K | ﹤0.01% | 17,261 +7,317 | +74% | +$13.1K | |||
| $31K | ﹤0.01% | 1,687 +1,681 | +28,017% | +$30.9K | |||
| $31K | ﹤0.01% | +1,201 | New | +$31K | |||
| $31K | ﹤0.01% | 1,048 -1,252 | -54% | -$37K | |||
| $31K | ﹤0.01% | 4,475 -23,241 | -84% | -$161K | |||
| $30K | ﹤0.01% | 6,274 +5,039 | +408% | +$24.1K | |||
| $30K | ﹤0.01% | +3,738 | New | +$30K | |||
| $30K | ﹤0.01% | 2,057 +492 | +31% | +$7.18K | |||
| $30K | ﹤0.01% | 6,807 -5,958 | -47% | -$26.3K | |||
| $30K | ﹤0.01% | 4,038 -8,702 | -68% | -$64.7K | |||
| $30K | ﹤0.01% | 18,637 -56,542 | -75% | -$91K | |||
| $30K | ﹤0.01% | +1,065 | New | +$30K | |||
| $29K | ﹤0.01% | 3,000 -89,530 | -97% | -$865K | |||
| $29K | ﹤0.01% | 2,262 +1,754 | +345% | +$22.5K | |||
| $29K | ﹤0.01% | 2,122 +2,071 | +4,061% | +$28.3K | |||
| $29K | ﹤0.01% | 5,210 -59,404 | -92% | -$331K | |||
| $29K | ﹤0.01% | +204 | New | +$29K | |||
| $29K | ﹤0.01% | 2,011 -1,603 | -44% | -$23.1K | |||
| $29K | ﹤0.01% | +804 | New | +$29K | |||
| $29K | ﹤0.01% | +3,308 | New | +$29K | |||
| $29K | ﹤0.01% | +1,959 | New | +$29K | |||
| $28K | ﹤0.01% | +3,255 | New | +$28K | |||
| $28K | ﹤0.01% | +13,532 | New | +$28K | |||
| $28K | ﹤0.01% | 18,048 +10,098 | +127% | +$15.7K |
