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 | |
|---|---|---|---|---|---|---|---|
| $1.19M | 0% | 29,702 | New | +$1.19M | |||
| $1.18M | 0% | 7,979 +1,720 | +27% | +$254K | |||
| $1.17M | 0% | 116,204 | New | +$1.17M | |||
| $1.17M | 0% | 91,829 | New | +$1.17M | |||
| $1.17M | 0% | 32,121 +22,557 | +236% | +$823K | |||
| $1.17M | 0% | 60,604 +58,796 | +3,252% | +$1.13M | |||
| $1.17M | 0% | 79,027 +38,793 | +96% | +$572K | |||
| $1.16M | 0% | 47,455 +16,778 | +55% | +$410K | |||
| $1.16M | 0% | 21,441 -24,255 | -53% | -$1.31M | |||
| $1.16M | 0% | 36,769 +28,952 | +370% | +$909K | |||
| $1.15M | 0% | 17,603 | New | +$1.15M | |||
| $1.14M | 0% | 130,671 | New | +$1.14M | |||
| $1.14M | 0% | 57,849 | New | +$1.14M | |||
| $1.14M | 0% | 35,959 | New | +$1.14M | |||
| $1.14M | 0% | 42,133 -64,919 | -61% | -$1.75M | |||
| $1.14M | 0% | 20,114 | New | +$1.14M | |||
| $1.12M | 0% | 32,544 +13,414 | +70% | +$461K | |||
| $1.12M | 0% | 16,641 -11,505 | -41% | -$774K | |||
| $1.1M | 0% | 14,467 -4,248 | -23% | -$324K | |||
| $1.1M | 0% | 7,003 | New | +$1.1M | |||
| $1.1M | 0% | 12,481 | New | +$1.1M | |||
| $1.1M | 0% | 20,764 -57,051 | -73% | -$3.02M | |||
| $1.09M | 0% | 150,951 -596,002 | -80% | -$4.31M | |||
| $1.09M | 0% | 3,483 | New | +$1.09M | |||
| $1.09M | 0% | 103,437 +58,998 | +133% | +$619K |
