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 | |
|---|---|---|---|---|---|---|---|
| $20K | ﹤0.01% | 5,342 +2,954 | +124% | +$11.1K | |||
| $20K | ﹤0.01% | 1,458 -1,397 | -49% | -$19.2K | |||
| $20K | ﹤0.01% | 1,595 -7,106 | -82% | -$89.1K | |||
| $20K | ﹤0.01% | +483 | New | +$20K | |||
| $20K | ﹤0.01% | 2,144 +1,784 | +496% | +$16.6K | |||
| $20K | ﹤0.01% | +317 | New | +$20K | |||
| $20K | ﹤0.01% | +2,929 | New | +$20K | |||
| $20K | ﹤0.01% | +25,712 | New | +$20K | |||
| $20K | ﹤0.01% | +160 | New | +$20K | |||
| $20K | ﹤0.01% | +3,152 | New | +$20K | |||
| $20K | ﹤0.01% | +419 | New | +$20K | |||
| $20K | ﹤0.01% | +372 | New | +$20K | |||
| $20K | ﹤0.01% | +1,742 | New | +$20K | |||
| $20K | ﹤0.01% | 603 -623 | -51% | -$20.7K | |||
| $20K | ﹤0.01% | 9,138 +6,941 | +316% | +$15.2K | |||
| $19K | ﹤0.01% | +7,350 | New | +$19K | |||
| $19K | ﹤0.01% | 17,029 -642 | -4% | -$716 | |||
| $19K | ﹤0.01% | 540 -10,663 | -95% | -$375K | |||
| $19K | ﹤0.01% | 5,036 +3,088 | +159% | +$11.7K | |||
| $19K | ﹤0.01% | 2,819 -3,054 | -52% | -$20.6K | |||
| $19K | ﹤0.01% | 984 +52 | +6% | +$1K | |||
| $19K | ﹤0.01% | 3,005 -1,026 | -25% | -$6.49K | |||
| $19K | ﹤0.01% | 41,289 -61,000 | -60% | -$28.1K | |||
| $19K | ﹤0.01% | 1,170 +944 | +418% | +$15.3K | |||
| $19K | ﹤0.01% | +1,072 | New | +$19K |
