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 | |
|---|---|---|---|---|---|---|---|
| $521K | 0% | 63,465 -41,141 | -39% | -$338K | |||
| $516K | 0% | 58,130 | New | +$516K | |||
| $515K | 0% | 2,122 | New | +$515K | |||
| $513K | 0% | 82,809 -114,745 | -58% | -$711K | |||
| $513K | 0% | 49,821 -393,130 | -89% | -$4.05M | |||
| $510K | 0% | 9,109 | New | +$510K | |||
| $506K | 0% | 3,764 | New | +$506K | |||
| $505K | 0% | 4,427 | New | +$505K | |||
| $503K | 0% | 47,524 -30,115 | -39% | -$319K | |||
| $502K | 0% | 94,693 | New | +$502K | |||
| $501K | 0% | 2,847 | New | +$501K | |||
| $499K | 0% | 139,001 -163,668 | -54% | -$588K | |||
| $499K | 0% | 76,700 +66,708 | +668% | +$434K | |||
| $498K | 0% | 298,671 +235,862 | +376% | +$393K | |||
| $497K | 0% | 8,089 +762 | +10% | +$46.8K | |||
| $497K | 0% | 24,628 | New | +$497K | |||
| $494K | 0% | 42,922 -80,217 | -65% | -$923K | |||
| $492K | 0% | 172,253 | New | +$492K | |||
| $487K | 0% | 5,517 +1,244 | +29% | +$110K | |||
| $484K | 0% | 38,280 +6,916 | +22% | +$87.4K | |||
| $483K | 0% | 32,076 +7,147 | +29% | +$108K | |||
| $469K | 0% | 2,369 | New | +$469K | |||
| $468K | 0% | 3,771 +3,524 | +1,427% | +$437K | |||
| $467K | 0% | 102,022 -40,559 | -28% | -$186K | |||
| $464K | 0% | 49,605 -253,189 | -84% | -$2.37M |
