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% | 3,736 | New | +$9K | |||
| $9K | 0% | 989 | New | +$9K | |||
| $9K | 0% | 2,099 +721 | +52% | +$3.09K | |||
| $9K | 0% | 75 +25 | +50% | +$3K | |||
| $9K | 0% | 100 | New | +$9K | |||
| $9K | 0% | 930 | New | +$9K | |||
| $9K | 0% | 6,117 | New | +$9K | |||
| $9K | 0% | 2,654 +2,493 | +1,548% | +$8.45K | |||
| $9K | 0% | 73 | New | +$9K | |||
| $9K | 0% | 325 -9,000 | -97% | -$249K | |||
| $9K | 0% | 383 +292 | +321% | +$6.86K | |||
| $9K | 0% | 200 | New | +$9K | |||
| $9K | 0% | 3,064 -2,649 | -46% | -$7.78K | |||
| $9K | 0% | 74 | New | +$9K | |||
| $9K | 0% | 3,388 +1,933 | +133% | +$5.14K | |||
| $9K | 0% | 18,340 +14,727 | +408% | +$7.23K | |||
| $9K | 0% | 1,953 | New | +$9K | |||
| $9K | 0% | 4,117 -50,982 | -93% | -$111K | |||
| $9K | 0% | 1,285 +359 | +39% | +$2.51K | |||
| $9K | 0% | 164 -400 | -71% | -$22K | |||
| $9K | 0% | 845 | New | +$9K | |||
| $9K | 0% | 6,087 | New | +$9K | |||
| $9K | 0% | 5,424 +463 | +9% | +$768 | |||
| $9K | 0% | 7,898 -369 | -4% | -$420 | |||
| $9K | 0% | 8,057 +4,463 | +124% | +$4.99K |
