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 | |
|---|---|---|---|---|---|---|---|
| $6K | 0% | 260 -3,900 | -94% | -$90K | |||
| $6K | 0% | 316 | New | +$6K | |||
| $6K | 0% | 1,042 | New | +$6K | |||
| $6K | 0% | 1,134 | New | +$6K | |||
| $6K | 0% | 211 | New | +$6K | |||
| $6K | 0% | 24,796 +22,368 | +921% | +$5.41K | |||
| $6K | 0% | 4,550 -15,135 | -77% | -$20K | |||
| $6K | 0% | 118 | New | +$6K | |||
| $6K | 0% | 100 | New | +$6K | |||
| $6K | 0% | 73 -227 | -76% | -$18.7K | |||
| $6K | 0% | 2,310 | New | +$6K | |||
| $6K | 0% | 479 -200 | -29% | -$2.51K | |||
| $6K | 0% | 1,753 -18,763 | -91% | -$64.2K | |||
| $6K | 0% | 102 -1,055 | -91% | -$62.1K | |||
| $6K | 0% | 2,402 -191 | -7% | -$477 | |||
| $6K | 0% | 928 +599 | +182% | +$3.87K | |||
| $5K | 0% | 2,900 -5,584 | -66% | -$9.63K | |||
| $5K | 0% | 2,681 -4,161 | -61% | -$7.76K | |||
| $5K | 0% | 123 | New | +$5K | |||
| $5K | 0% | 512 | New | +$5K | |||
| $5K | 0% | 201 | New | +$5K | |||
| $5K | 0% | 140 | New | +$5K | |||
| $5K | 0% | 4,108 -5,801 | -59% | -$7.06K | |||
| $5K | 0% | 9,451 +9,269 | +5,093% | +$4.9K | |||
| $5K | 0% | 403 | New | +$5K |
