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 | |
|---|---|---|---|---|---|---|---|
| $808K | 0% | 10,755 +7,573 | +238% | +$569K | |||
| $805K | 0% | 17,435 | New | +$805K | |||
| $802K | 0% | 3,620 -2,502 | -41% | -$554K | |||
| $798K | 0% | 52,123 +24,829 | +91% | +$380K | |||
| $790K | 0% | 15,698 +9,423 | +150% | +$474K | |||
| $790K | 0% | 91,805 -80,639 | -47% | -$694K | |||
| $790K | 0% | 4,746 -5,261 | -53% | -$876K | |||
| $784K | 0% | 92,530 | New | +$784K | |||
| $782K | 0% | 1,799 -671 | -27% | -$292K | |||
| $773K | 0% | 12,524 -5,858 | -32% | -$362K | |||
| $773K | 0% | 30,226 | New | +$773K | |||
| $768K | 0% | 90,361 +45,675 | +102% | +$388K | |||
| $758K | 0% | 3,842 -1,481 | -28% | -$292K | |||
| $756K | 0% | 12,134 | New | +$756K | |||
| $756K | 0% | 129,605 +69,550 | +116% | +$406K | |||
| $754K | 0% | 2,232 +2,150 | +2,622% | +$726K | |||
| $752K | 0% | 19,031 | New | +$752K | |||
| $749K | 0% | 21,755 | New | +$749K | |||
| $742K | 0% | 234,230 -60,330 | -20% | -$191K | |||
| $741K | 0% | 9,923 | New | +$741K | |||
| $740K | 0% | 56,719 -46,670 | -45% | -$609K | |||
| $739K | 0% | 24,254 -10,021 | -29% | -$305K | |||
| $738K | 0% | 4,765 +3,630 | +320% | +$562K | |||
| $733K | 0% | 45,098 | New | +$733K | |||
| $729K | 0% | 1,108,586 -465,093 | -30% | -$306K |
