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 | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $33K | 0% | 224 +216 | +2,700% | +$31.8K | |||
| $33K | 0% | 9,991 -446 | -4% | -$1.47K | |||
| $33K | 0% | 8,570 +4,258 | +99% | +$16.4K | |||
| $33K | 0% | 1,966 | New | +$33K | |||
| $33K | 0% | 5,775 -3,724 | -39% | -$21.3K | |||
| $33K | 0% | 1,321 | New | +$33K | |||
| $33K | 0% | 8,936 -228 | -2% | -$842 | |||
| $33K | 0% | 1,078 | New | +$33K | |||
| $32K | 0% | 523 | New | +$32K | |||
| $32K | 0% | 1,206 | New | +$32K | |||
| $32K | 0% | 911 -1,383 | -60% | -$48.6K | |||
| $32K | 0% | 901 -31,352 | -97% | -$1.11M | |||
| $32K | 0% | 40,636 +35,994 | +775% | +$28.3K | |||
| $32K | 0% | 2,219 -49,933 | -96% | -$720K | |||
| $32K | 0% | 41,846 +23,032 | +122% | +$17.6K | |||
| $32K | 0% | 6,408 -2,834 | -31% | -$14.2K | |||
| $32K | 0% | 12,521 -34,941 | -74% | -$89.3K | |||
| $32K | 0% | 1,198 | New | +$32K | |||
| $32K | 0% | 30,908 | New | +$32K | |||
| $32K | 0% | 710 -227 | -24% | -$10.2K | |||
| $32K | 0% | 1,063 -3,502 | -77% | -$105K | |||
| $32K | 0% | 15,327 -48,728 | -76% | -$102K | |||
| $31K | 0% | 5,873 +4,974 | +553% | +$26.3K | |||
| $31K | 0% | 11,889 | New | +$31K | |||
| $31K | 0% | 1,006 -792 | -44% | -$24.4K |
