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 | |
|---|---|---|---|---|---|---|---|
| $36K | ﹤0.01% | +4,490 | New | +$36K | |||
| $36K | ﹤0.01% | +679 | New | +$36K | |||
| $36K | ﹤0.01% | 29,973 -342,806 | -92% | -$412K | |||
| $36K | ﹤0.01% | 887 -116 | -12% | -$4.71K | |||
| $36K | ﹤0.01% | 137 -1,673 | -92% | -$440K | |||
| $36K | ﹤0.01% | 2,020 -43,736 | -96% | -$779K | |||
| $36K | ﹤0.01% | 6,967 -24,354 | -78% | -$126K | |||
| $36K | ﹤0.01% | +496 | New | +$36K | |||
| $35K | ﹤0.01% | 6,381 -5,530 | -46% | -$30.3K | |||
| $35K | ﹤0.01% | +2,502 | New | +$35K | |||
| $35K | ﹤0.01% | 2,039 -422 | -17% | -$7.24K | |||
| $35K | ﹤0.01% | +998 | New | +$35K | |||
| $35K | ﹤0.01% | +8,233 | New | +$35K | |||
| $35K | ﹤0.01% | 252 -232 | -48% | -$32.2K | |||
| $35K | ﹤0.01% | +2,961 | New | +$35K | |||
| $35K | ﹤0.01% | 1,681 -966 | -36% | -$20.1K | |||
| $35K | ﹤0.01% | 3,499 -1,704 | -33% | -$17K | |||
| $35K | ﹤0.01% | +18,321 | New | +$35K | |||
| $35K | ﹤0.01% | +3,142 | New | +$35K | |||
| $35K | ﹤0.01% | 8,312 -28,963 | -78% | -$122K | |||
| $34K | ﹤0.01% | 3,553 -4,130 | -54% | -$39.5K | |||
| $34K | ﹤0.01% | 17,404 +6,498 | +60% | +$12.7K | |||
| $34K | ﹤0.01% | 12,442 +6,325 | +103% | +$17.3K | |||
| $34K | ﹤0.01% | 9,361 +5,048 | +117% | +$18.3K | |||
| $34K | ﹤0.01% | 2,860 +2,295 | +406% | +$27.3K |
