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 | |
|---|---|---|---|---|---|---|---|
| $26K | 0% | 3,686 | New | +$26K | |||
| $26K | 0% | 3,740 -100,094 | -96% | -$696K | |||
| $26K | 0% | 510 -5,682 | -92% | -$290K | |||
| $26K | 0% | 1,216 | New | +$26K | |||
| $26K | 0% | 4,592 -11,733 | -72% | -$66.4K | |||
| $26K | 0% | 1,635 | New | +$26K | |||
| $26K | 0% | 1,558 +1,394 | +850% | +$23.3K | |||
| $26K | 0% | 132 | New | +$26K | |||
| $26K | 0% | 111,704 -80,200 | -42% | -$18.7K | |||
| $26K | 0% | 6,248 | New | +$26K | |||
| $25K | 0% | 17,671 -50,640 | -74% | -$71.6K | |||
| $25K | 0% | 368 +210 | +133% | +$14.3K | |||
| $25K | 0% | 15,755 -65,880 | -81% | -$105K | |||
| $25K | 0% | 25,263 -88,650 | -78% | -$87.7K | |||
| $25K | 0% | 656 | New | +$25K | |||
| $25K | 0% | 6,345 +4,290 | +209% | +$16.9K | |||
| $25K | 0% | 173 | New | +$25K | |||
| $25K | 0% | 15,473 | New | +$25K | |||
| $25K | 0% | 13,489 +11,700 | +654% | +$21.7K | |||
| $24K | 0% | 849 | New | +$24K | |||
| $24K | 0% | 4,396 -40,450 | -90% | -$221K | |||
| $24K | 0% | 163 +154 | +1,711% | +$22.7K | |||
| $24K | 0% | 8,555 -547 | -6% | -$1.54K | |||
| $24K | 0% | 1,863 +490 | +36% | +$6.31K | |||
| $24K | 0% | 2,674 | New | +$24K |
