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 | |
|---|---|---|---|---|---|---|---|
| $34K | ﹤0.01% | +348 | New | +$34K | |||
| $34K | ﹤0.01% | +2,962 | New | +$34K | |||
| $34K | ﹤0.01% | 1,002 -73,475 | -99% | -$2.49M | |||
| $33K | ﹤0.01% | 1,359 -8,389 | -86% | -$204K | |||
| $33K | ﹤0.01% | 6,227 +2,051 | +49% | +$10.9K | |||
| $33K | ﹤0.01% | 1,986 +1,216 | +158% | +$20.2K | |||
| $33K | ﹤0.01% | 82,983 +637 | +0.8% | +$253 | |||
| $33K | ﹤0.01% | 10,732 -24,470 | -70% | -$75.2K | |||
| $33K | ﹤0.01% | +2,274 | New | +$33K | |||
| $33K | ﹤0.01% | 449 +373 | +491% | +$27.4K | |||
| $33K | ﹤0.01% | 1,166 +669 | +135% | +$18.9K | |||
| $32K | ﹤0.01% | +1,466 | New | +$32K | |||
| $32K | ﹤0.01% | +3,560 | New | +$32K | |||
| $32K | ﹤0.01% | 725 -7,291 | -91% | -$322K | |||
| $32K | ﹤0.01% | 1,857 +1,448 | +354% | +$25K | |||
| $32K | ﹤0.01% | +2,926 | New | +$32K | |||
| $32K | ﹤0.01% | +18,742 | New | +$32K | |||
| $32K | ﹤0.01% | +4,223 | New | +$32K | |||
| $32K | ﹤0.01% | +1,833 | New | +$32K | |||
| $32K | ﹤0.01% | +301 | New | +$32K | |||
| $32K | ﹤0.01% | 2,106 +1,818 | +631% | +$27.6K | |||
| $32K | ﹤0.01% | 1,266 +665 | +111% | +$16.8K | |||
| $31K | ﹤0.01% | +1,379 | New | +$31K | |||
| $31K | ﹤0.01% | +565 | New | +$31K | |||
| $31K | ﹤0.01% | 238 +204 | +600% | +$26.6K |
