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 | |
|---|---|---|---|---|---|---|---|
| $9K | 0% | 1,130 | New | +$9K | |||
| $9K | 0% | 737 -82 | -10% | -$1K | |||
| $9K | 0% | 102 +52 | +104% | +$4.59K | |||
| $9K | 0% | 125 -1,118 | -90% | -$80.5K | |||
| $9K | 0% | 8,306 +7,702 | +1,275% | +$8.35K | |||
| $9K | 0% | 2,693 -7,381 | -73% | -$24.7K | |||
| $9K | 0% | 932 -502 | -35% | -$4.85K | |||
| $9K | 0% | 845 +743 | +728% | +$7.91K | |||
| $9K | 0% | 688 | New | +$9K | |||
| $9K | 0% | 429 | New | +$9K | |||
| $9K | 0% | 693 | New | +$9K | |||
| $8K | 0% | 24,352 -10,093 | -29% | -$3.32K | |||
| $8K | 0% | 224 | New | +$8K | |||
| $8K | 0% | 1,028 | New | +$8K | |||
| $8K | 0% | 7,950 -40,813 | -84% | -$41.1K | |||
| $8K | 0% | 230 +174 | +311% | +$6.05K | |||
| $8K | 0% | 625 | New | +$8K | |||
| $8K | 0% | 1,196 -69,431 | -98% | -$464K | |||
| $8K | 0% | 3,026 -7,429 | -71% | -$19.6K | |||
| $8K | 0% | 597 | New | +$8K | |||
| $8K | 0% | 887 -2,478 | -74% | -$22.3K | |||
| $8K | 0% | 15,766 | New | +$8K | |||
| $8K | 0% | 78 -432 | -85% | -$44.3K | |||
| $8K | 0% | 7,956 +5,174 | +186% | +$5.2K | |||
| $8K | 0% | 98 | New | +$8K |
