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 | |
|---|---|---|---|---|---|---|---|
| $28K | 0% | 3,015 +1,657 | +122% | +$15.4K | |||
| $28K | 0% | 1,503 | New | +$28K | |||
| $28K | 0% | 351 -391 | -53% | -$31.2K | |||
| $28K | 0% | 2,911 -3,977 | -58% | -$38.3K | |||
| $28K | 0% | 961 -84 | -8% | -$2.45K | |||
| $28K | 0% | 1,039 +816 | +366% | +$22K | |||
| $28K | 0% | 2,203 +2,025 | +1,138% | +$25.7K | |||
| $28K | 0% | 6,983 +5,544 | +385% | +$22.2K | |||
| $28K | 0% | 3,477 | New | +$28K | |||
| $28K | 0% | 539 -2,188 | -80% | -$114K | |||
| $28K | 0% | 3,187 +2,200 | +223% | +$19.3K | |||
| $27K | 0% | 4,711 -40,521 | -90% | -$232K | |||
| $27K | 0% | 1,505 | New | +$27K | |||
| $27K | 0% | 3,598 +2,195 | +156% | +$16.5K | |||
| $27K | 0% | 1,173 +165 | +16% | +$3.8K | |||
| $27K | 0% | 272 +207 | +318% | +$20.5K | |||
| $27K | 0% | 4,031 +1,783 | +79% | +$11.9K | |||
| $27K | 0% | 39,113 +2,979 | +8% | +$2.06K | |||
| $27K | 0% | 730 -39,206 | -98% | -$1.45M | |||
| $27K | 0% | 38,083 +2,601 | +7% | +$1.84K | |||
| $27K | 0% | 921 | New | +$27K | |||
| $27K | 0% | 627 | New | +$27K | |||
| $26K | 0% | 370 -41,856 | -99% | -$2.94M | |||
| $26K | 0% | 30,098 | New | +$26K | |||
| $26K | 0% | 1,662 | New | +$26K |
