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 | |
|---|---|---|---|---|---|---|---|
| $3K | 0% | 2,479 -2,881 | -54% | -$3.49K | |||
| $3K | 0% | 54 | New | +$3K | |||
| $3K | 0% | 32 | New | +$3K | |||
| $3K | 0% | 726 | New | +$3K | |||
| $3K | 0% | 45 | New | +$3K | |||
| $3K | 0% | 60 | New | +$3K | |||
| $3K | 0% | 1,829 +1,499 | +454% | +$2.46K | |||
| $3K | 0% | 3,880 -7,804 | -67% | -$6.03K | |||
| $3K | 0% | 144 | New | +$3K | |||
| $3K | 0% | 440 +119 | +37% | +$811 | |||
| $3K | 0% | 820 -23,460 | -97% | -$85.8K | |||
| $3K | 0% | 123 | New | +$3K | |||
| $3K | 0% | 208 | New | +$3K | |||
| $3K | 0% | 198 -2,175 | -92% | -$33K | |||
| $3K | 0% | 520 | New | +$3K | |||
| $3K | 0% | 37 | New | +$3K | |||
| $3K | 0% | 2,368 -1,453 | -38% | -$1.84K | |||
| $3K | 0% | 82 | New | +$3K | |||
| $3K | 0% | 1,364 -5,049 | -79% | -$11.1K | |||
| $3K | 0% | 308 -173 | -36% | -$1.69K | |||
| $3K | 0% | 61 -5 | -8% | -$246 | |||
| $3K | 0% | 76 +9 | +13% | +$355 | |||
| $3K | 0% | 5,098 -12 | -0.2% | -$7 | |||
| $3K | 0% | 82 | New | +$3K | |||
| $3K | 0% | 332 | New | +$3K |
