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 | |
|---|---|---|---|---|---|---|---|
| $18K | ﹤0.01% | 83 -543 | -87% | -$118K | |||
| $18K | ﹤0.01% | +684 | New | +$18K | |||
| $18K | ﹤0.01% | 1,770 +1,317 | +291% | +$13.4K | |||
| $18K | ﹤0.01% | 11,965 +4,982 | +71% | +$7.5K | |||
| $18K | ﹤0.01% | +4,875 | New | +$18K | |||
| $18K | ﹤0.01% | +502 | New | +$18K | |||
| $18K | ﹤0.01% | 796 +76 | +11% | +$1.72K | |||
| $18K | ﹤0.01% | 640 +491 | +330% | +$13.8K | |||
| $18K | ﹤0.01% | 3,149 -7,882 | -71% | -$45.1K | |||
| $18K | ﹤0.01% | +3,847 | New | +$18K | |||
| $18K | ﹤0.01% | 157 +144 | +1,108% | +$16.5K | |||
| $18K | ﹤0.01% | +1,935 | New | +$18K | |||
| $18K | ﹤0.01% | 667 -50 | -7% | -$1.35K | |||
| $17K | ﹤0.01% | 1,871 +1,091 | +140% | +$9.91K | |||
| $17K | ﹤0.01% | 12,196 +2,086 | +21% | +$2.91K | |||
| $17K | ﹤0.01% | 333 -4,368 | -93% | -$223K | |||
| $17K | ﹤0.01% | +1,766 | New | +$17K | |||
| $17K | ﹤0.01% | 626 -590 | -49% | -$16K | |||
| $17K | ﹤0.01% | +3,083 | New | +$17K | |||
| $17K | ﹤0.01% | 12,592 +97 | +0.8% | +$131 | |||
| $17K | ﹤0.01% | +1,479 | New | +$17K | |||
| $17K | ﹤0.01% | +833 | New | +$17K | |||
| $17K | ﹤0.01% | +218 | New | +$17K | |||
| $17K | ﹤0.01% | 1,222 -44,343 | -97% | -$617K | |||
| $17K | ﹤0.01% | 2,296 +2,102 | +1,084% | +$15.6K |
