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 | |
|---|---|---|---|---|---|---|---|
| $59K | 0% | 304 | New | +$59K | |||
| $59K | 0% | 210 +74 | +54% | +$20.8K | |||
| $58K | 0% | 4,472 -31,904 | -88% | -$414K | |||
| $58K | 0% | 364 -4,764 | -93% | -$759K | |||
| $58K | 0% | 2,647 -611 | -19% | -$13.4K | |||
| $58K | 0% | 7,601 | New | +$58K | |||
| $57K | 0% | 11,911 | New | +$57K | |||
| $57K | 0% | 65,812 | New | +$57K | |||
| $57K | 0% | 13,977 +13,028 | +1,373% | +$53.1K | |||
| $57K | 0% | 841 +81 | +11% | +$5.49K | |||
| $57K | 0% | 12,580 +10,349 | +464% | +$46.9K | |||
| $57K | 0% | 8,290 | New | +$57K | |||
| $56K | 0% | 10,304 +7,446 | +261% | +$40.5K | |||
| $56K | 0% | 16,622 +14,440 | +662% | +$48.6K | |||
| $56K | 0% | 484 | New | +$56K | |||
| $56K | 0% | 3,387 -1,639 | -33% | -$27.1K | |||
| $55K | 0% | 4,561 | New | +$55K | |||
| $55K | 0% | 5,043 -51,798 | -91% | -$565K | |||
| $55K | 0% | 5,646 | New | +$55K | |||
| $55K | 0% | 2,580 +1,878 | +268% | +$40K | |||
| $55K | 0% | 641 | New | +$55K | |||
| $54K | 0% | 6,799 -44,196 | -87% | -$351K | |||
| $54K | 0% | 34,995 -90,126 | -72% | -$139K | |||
| $54K | 0% | 173,129 +132,386 | +325% | +$41.3K | |||
| $54K | 0% | 5,282 +4,561 | +633% | +$46.6K |
