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 | |
|---|---|---|---|---|---|---|---|
| $4.99M | 0% | 55,312 +15,136 | +38% | +$1.36M | |||
| $4.98M | 0% | 74,760 +7,513 | +11% | +$501K | |||
| $4.9M | 0% | 300,558 -16,728 | -5% | -$273K | |||
| $4.89M | 0% | 86,365 +65,004 | +304% | +$3.68M | |||
| $4.86M | 0% | 121,615 +66,616 | +121% | +$2.66M | |||
| $4.84M | 0% | 75,819 +6,409 | +9% | +$409K | |||
| $4.74M | 0% | 48,430 -22,961 | -32% | -$2.25M | |||
| $4.73M | 0% | 56,630 +20,183 | +55% | +$1.69M | |||
| $4.66M | 0% | 17,470 -23,235 | -57% | -$6.2M | |||
| $4.55M | 0% | 17,371 | New | +$4.55M | |||
| $4.5M | 0% | 439,923 +394,149 | +861% | +$4.04M | |||
| $4.46M | 0% | 30,512 | New | +$4.46M | |||
| $4.29M | 0% | 521,623 +302,677 | +138% | +$2.49M | |||
| $4.27M | 0% | 83,955 | New | +$4.27M | |||
| $4.23M | 0% | 176,588 | New | +$4.23M | |||
| $4.2M | 0% | 165,559 +61,891 | +60% | +$1.57M | |||
| $4.14M | 0% | 99,373 | New | +$4.14M | |||
| $4.11M | 0% | 117,324 | New | +$4.11M | |||
| $4.1M | 0% | 179,071 +89,562 | +100% | +$2.05M | |||
| $4.05M | 0% | 42,380 +4,229 | +11% | +$404K | |||
| $4.01M | 0% | 27,450 | New | +$4.01M | |||
| $3.93M | 0% | 552,241 +470,733 | +578% | +$3.35M | |||
| $3.9M | 0% | 17,673 -26,736 | -60% | -$5.9M | |||
| $3.9M | 0% | 19,730 | New | +$3.9M | |||
| $3.89M | 0% | 99,151 +27,360 | +38% | +$1.07M |
