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 | |
|---|---|---|---|---|---|---|---|
| $24K | 0% | 15,985 +13,316 | +499% | +$20K | |||
| $24K | 0% | 974 +272 | +39% | +$6.7K | |||
| $23K | 0% | 345 | New | +$23K | |||
| $23K | 0% | 4,265 +3,383 | +384% | +$18.2K | |||
| $23K | 0% | 1,565 +1,174 | +300% | +$17.3K | |||
| $23K | 0% | 1,392 | New | +$23K | |||
| $23K | 0% | 16,337 -20,656 | -56% | -$29.1K | |||
| $23K | 0% | 169 -43 | -20% | -$5.85K | |||
| $23K | 0% | 13,666 -5,763 | -30% | -$9.7K | |||
| $23K | 0% | 3,816 +283 | +8% | +$1.71K | |||
| $23K | 0% | 5,371 | New | +$23K | |||
| $23K | 0% | 287 | New | +$23K | |||
| $23K | 0% | 269 | New | +$23K | |||
| $22K | 0% | 1,000 +923 | +1,199% | +$20.3K | |||
| $22K | 0% | 1,150 +1,137 | +8,746% | +$21.8K | |||
| $22K | 0% | 4,643 +158 | +4% | +$749 | |||
| $22K | 0% | 1,152 +1,089 | +1,729% | +$20.8K | |||
| $22K | 0% | 1,236 | New | +$22K | |||
| $22K | 0% | 28,766 +13,134 | +84% | +$10K | |||
| $22K | 0% | 948 +500 | +112% | +$11.6K | |||
| $22K | 0% | 129 | New | +$22K | |||
| $22K | 0% | 8,672 -19,715 | -69% | -$50K | |||
| $22K | 0% | 3,312 | New | +$22K | |||
| $22K | 0% | 1,400 +1,086 | +346% | +$17.1K | |||
| $22K | 0% | 25,384 -13,215 | -34% | -$11.5K |
