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 | |
|---|---|---|---|---|---|---|---|
| $176K | 0% | 14,215 | New | +$176K | |||
| $174K | 0% | 2,407 +1,865 | +344% | +$135K | |||
| $173K | 0% | 2,589 | New | +$173K | |||
| $173K | 0% | 824 -353 | -30% | -$74.1K | |||
| $173K | 0% | 16,472 -944 | -5% | -$9.92K | |||
| $173K | 0% | 295 | New | +$173K | |||
| $173K | 0% | 7,493 | New | +$173K | |||
| $172K | 0% | 2,353 | New | +$172K | |||
| $172K | 0% | 2,983 | New | +$172K | |||
| $171K | 0% | 4,646 | New | +$171K | |||
| $171K | 0% | 52,767 -32,926 | -38% | -$107K | |||
| $168K | 0% | 42,000 -33,165 | -44% | -$133K | |||
| $168K | 0% | 34,297 -3,099 | -8% | -$15.2K | |||
| $168K | 0% | 13,688 | New | +$168K | |||
| $167K | 0% | 6,156 -35,359 | -85% | -$959K | |||
| $167K | 0% | 767 | New | +$167K | |||
| $165K | 0% | 5,562 +3,334 | +150% | +$98.9K | |||
| $165K | 0% | 31,943 +25,841 | +423% | +$133K | |||
| $164K | 0% | 4,758 +2,538 | +114% | +$87.5K | |||
| $164K | 0% | 4,699 -10,421 | -69% | -$364K | |||
| $162K | 0% | 60,301 | New | +$162K | |||
| $162K | 0% | 14,182 -19,526 | -58% | -$223K | |||
| $161K | 0% | 5,338 -243 | -4% | -$7.33K | |||
| $161K | 0% | 44,006 +43,320 | +6,315% | +$158K | |||
| $160K | 0% | 10,448 -19,449 | -65% | -$298K |
