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 | |
|---|---|---|---|---|---|---|---|
| $596K | 0% | 75,587 -16,830 | -18% | -$133K | |||
| $596K | 0% | 15,189 | New | +$596K | |||
| $592K | 0% | 23,528 -322,268 | -93% | -$8.11M | |||
| $590K | 0% | 4,748 | New | +$590K | |||
| $589K | 0% | 37,896 -8,170 | -18% | -$127K | |||
| $587K | 0% | 52,591 +51,291 | +3,945% | +$572K | |||
| $586K | 0% | 7,946 | New | +$586K | |||
| $585K | 0% | 17,647 +10,757 | +156% | +$357K | |||
| $583K | 0% | 14,208 -4,800 | -25% | -$197K | |||
| $582K | 0% | 120,947 | New | +$582K | |||
| $581K | 0% | 2,463 -7,979 | -76% | -$1.88M | |||
| $580K | 0% | 13,286 | New | +$580K | |||
| $578K | 0% | 91,426 +46,070 | +102% | +$291K | |||
| $576K | 0% | 9,395 | New | +$576K | |||
| $575K | 0% | 8,068 -16,485 | -67% | -$1.17M | |||
| $574K | 0% | 68,549 +68,278 | +25,195% | +$572K | |||
| $573K | 0% | 7,546 -46,404 | -86% | -$3.52M | |||
| $572K | 0% | 20,156 +14,298 | +244% | +$406K | |||
| $571K | 0% | 6,484 | New | +$571K | |||
| $571K | 0% | 38,595 -4,889 | -11% | -$72.3K | |||
| $569K | 0% | 86,700 -26,660 | -24% | -$175K | |||
| $568K | 0% | 27,536 +3,675 | +15% | +$75.8K | |||
| $564K | 0% | 26,849 -158,440 | -86% | -$3.33M | |||
| $564K | 0% | 22,255 -15,281 | -41% | -$387K | |||
| $560K | 0% | 22,551 +20,645 | +1,083% | +$513K |
