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 | |
|---|---|---|---|---|---|---|---|
| $1.46M | 0% | 6,457 | New | +$1.46M | |||
| $1.45M | 0% | 230,148 -119,232 | -34% | -$753K | |||
| $1.45M | 0% | 257,587 | New | +$1.45M | |||
| $1.44M | 0% | 387,239 +216,320 | +127% | +$807K | |||
| $1.44M | 0% | 46,194 | New | +$1.44M | |||
| $1.43M | 0% | 47,333 +44,946 | +1,883% | +$1.36M | |||
| $1.42M | 0% | 53,718 | New | +$1.42M | |||
| $1.41M | 0% | 39,594 +38,438 | +3,325% | +$1.37M | |||
| $1.4M | 0% | 51,332 +36,715 | +251% | +$1M | |||
| $1.4M | 0% | 72,854 | New | +$1.4M | |||
| $1.39M | 0% | 208,401 -54,791 | -21% | -$366K | |||
| $1.39M | 0% | 309,958 +164,271 | +113% | +$737K | |||
| $1.39M | 0% | 160,473 -99,304 | -38% | -$859K | |||
| $1.39M | 0% | 24,046 +11,704 | +95% | +$674K | |||
| $1.38M | 0% | 474,073 +285,437 | +151% | +$833K | |||
| $1.38M | 0% | 145,341 +41,812 | +40% | +$397K | |||
| $1.37M | 0% | 23,232 +16,021 | +222% | +$946K | |||
| $1.37M | 0% | 12,731 | New | +$1.37M | |||
| $1.36M | 0% | 81,949 +71,406 | +677% | +$1.19M | |||
| $1.36M | 0% | 17,823 | New | +$1.36M | |||
| $1.35M | 0% | 8,228 | New | +$1.35M | |||
| $1.34M | 0% | 42,476 +6,799 | +19% | +$214K | |||
| $1.34M | 0% | 13,076 +2,995 | +30% | +$306K | |||
| $1.33M | 0% | 8,350 | New | +$1.33M | |||
| $1.32M | 0% | 237,861 -146,423 | -38% | -$814K |
