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 | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $20K | 0% | 1,657 | New | +$20K | |||
| $19K | 0% | 1,219 -434 | -26% | -$6.77K | |||
| $19K | 0% | 18,452 +5,923 | +47% | +$6.1K | |||
| $19K | 0% | 254 | New | +$19K | |||
| $19K | 0% | 456 | New | +$19K | |||
| $19K | 0% | 2,234 -485 | -18% | -$4.13K | |||
| $19K | 0% | 715 +445 | +165% | +$11.8K | |||
| $19K | 0% | 1,437 -21,535 | -94% | -$285K | |||
| $19K | 0% | 10,947 -41,790 | -79% | -$72.5K | |||
| $19K | 0% | 27,591 -145,170 | -84% | -$100K | |||
| $19K | 0% | 1,355 +1,171 | +636% | +$16.4K | |||
| $19K | 0% | 427 | New | +$19K | |||
| $19K | 0% | 383 +231 | +152% | +$11.5K | |||
| $19K | 0% | 160 +41 | +34% | +$4.87K | |||
| $18K | 0% | 15,135 +14,153 | +1,441% | +$16.8K | |||
| $18K | 0% | 7,829 -1,392 | -15% | -$3.2K | |||
| $18K | 0% | 916 +245 | +37% | +$4.81K | |||
| $18K | 0% | 822 | New | +$18K | |||
| $18K | 0% | 4,313 +2,319 | +116% | +$9.68K | |||
| $18K | 0% | 16,373 -66,610 | -80% | -$73.2K | |||
| $18K | 0% | 13,255 -23,880 | -64% | -$32.4K | |||
| $18K | 0% | 10,906 +9,363 | +607% | +$15.5K | |||
| $18K | 0% | 1,683 -1,578 | -48% | -$16.9K | |||
| $18K | 0% | 642 -8,712 | -93% | -$244K | |||
| $18K | 0% | 876 | New | +$18K |
