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 | |
|---|---|---|---|---|---|---|---|
| $328K | 0% | 49,647 -85,471 | -63% | -$565K | |||
| $326K | 0% | 65,640 +27,672 | +73% | +$137K | |||
| $326K | 0% | 127,697 +99,343 | +350% | +$254K | |||
| $326K | 0% | 19,160 +15,772 | +466% | +$268K | |||
| $325K | 0% | 64,568 | New | +$325K | |||
| $324K | 0% | 19,299 -9,967 | -34% | -$167K | |||
| $322K | 0% | 40,901 -3,184 | -7% | -$25.1K | |||
| $322K | 0% | 18,942 | New | +$322K | |||
| $321K | 0% | 16,467 +10,571 | +179% | +$206K | |||
| $320K | 0% | 762 | New | +$320K | |||
| $319K | 0% | 39,210 | New | +$319K | |||
| $318K | 0% | 4,883 -455 | -9% | -$29.6K | |||
| $316K | 0% | 1,032 +935 | +964% | +$286K | |||
| $316K | 0% | 20,951 | New | +$316K | |||
| $313K | 0% | 8,016 -17,856 | -69% | -$697K | |||
| $313K | 0% | 13,846 +13,760 | +16,000% | +$311K | |||
| $312K | 0% | 1,807 | New | +$312K | |||
| $310K | 0% | 46,318 +22,332 | +93% | +$149K | |||
| $307K | 0% | 4,294 +2,733 | +175% | +$195K | |||
| $307K | 0% | 68,377 +8,295 | +14% | +$37.2K | |||
| $304K | 0% | 21,571 -49,170 | -70% | -$693K | |||
| $304K | 0% | 90,660 | New | +$304K | |||
| $302K | 0% | 190,021 +47,439 | +33% | +$75.4K | |||
| $302K | 0% | 26,065 +24,483 | +1,548% | +$284K | |||
| $298K | 0% | 54,595 -74,888 | -58% | -$409K |
