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 | |
|---|---|---|---|---|---|---|---|
| $650K | 0% | 172,450 -11,940 | -6% | -$45K | |||
| $649K | 0% | 80,178 +22,839 | +40% | +$185K | |||
| $647K | 0% | 18,548 | New | +$647K | |||
| $646K | 0% | 22,649 | New | +$646K | |||
| $643K | 0% | 34,178 +13,032 | +62% | +$245K | |||
| $641K | 0% | 73,690 -79,349 | -52% | -$690K | |||
| $640K | 0% | 8,522 | New | +$640K | |||
| $631K | 0% | 63,679 +41,817 | +191% | +$414K | |||
| $631K | 0% | 15,733 +4,789 | +44% | +$192K | |||
| $627K | 0% | 21,451 | New | +$627K | |||
| $622K | 0% | 19,029 +17,602 | +1,234% | +$575K | |||
| $620K | 0% | 20,350 -78,866 | -79% | -$2.4M | |||
| $617K | 0% | 108,147 +18,936 | +21% | +$108K | |||
| $617K | 0% | 70,520 -37,073 | -34% | -$324K | |||
| $616K | 0% | 19,045 +17,795 | +1,424% | +$576K | |||
| $614K | 0% | 142,028 +67,798 | +91% | +$293K | |||
| $610K | 0% | 42,768 | New | +$610K | |||
| $606K | 0% | 68,562 +3,318 | +5% | +$29.3K | |||
| $602K | 0% | 4,915 | New | +$602K | |||
| $601K | 0% | 1,867 +787 | +73% | +$253K | |||
| $599K | 0% | 64,105 +35,745 | +126% | +$334K | |||
| $599K | 0% | 7,799 -15,081 | -66% | -$1.16M | |||
| $597K | 0% | 85,082 +38,175 | +81% | +$268K | |||
| $597K | 0% | 11,488 | New | +$597K | |||
| $596K | 0% | 100,666 | New | +$596K |
