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 | |
|---|---|---|---|---|---|---|---|
| $211K | 0% | 4,430 +3,677 | +488% | +$175K | |||
| $211K | 0% | 146,741 | New | +$211K | |||
| $211K | 0% | 12,702 | New | +$211K | |||
| $210K | 0% | 929 | New | +$210K | |||
| $210K | 0% | 22,660 +1,881 | +9% | +$17.4K | |||
| $210K | 0% | 11,603 +4,229 | +57% | +$76.5K | |||
| $209K | 0% | 18,929 +6,826 | +56% | +$75.4K | |||
| $209K | 0% | 3,832 +3,654 | +2,053% | +$199K | |||
| $209K | 0% | 2,760 +2,255 | +447% | +$171K | |||
| $208K | 0% | 44,847 +43,731 | +3,919% | +$203K | |||
| $208K | 0% | 8,169 +3,960 | +94% | +$101K | |||
| $207K | 0% | 6,981 +4,625 | +196% | +$137K | |||
| $206K | 0% | 13,042 -2,811 | -18% | -$44.4K | |||
| $204K | 0% | 19,485 -9,619 | -33% | -$101K | |||
| $204K | 0% | 108,681 | New | +$204K | |||
| $204K | 0% | 15,447 -30,682 | -67% | -$405K | |||
| $204K | 0% | 41,374 | New | +$204K | |||
| $204K | 0% | 37,275 | New | +$204K | |||
| $203K | 0% | 2,753 -5,377 | -66% | -$396K | |||
| $202K | 0% | 92,273 -75,519 | -45% | -$165K | |||
| $202K | 0% | 5,402 +5,370 | +16,781% | +$201K | |||
| $202K | 0% | 1,111 | New | +$202K | |||
| $201K | 0% | 7,976 | New | +$201K | |||
| $201K | 0% | 4,160 +3,967 | +2,055% | +$192K | |||
| $201K | 0% | 4,631 -456 | -9% | -$19.8K |
