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 | |
|---|---|---|---|---|---|---|---|
| $43K | 0% | 386 -4,837 | -93% | -$539K | |||
| $43K | 0% | 20,507 +14,177 | +224% | +$29.7K | |||
| $43K | 0% | 5,203 -3,318 | -39% | -$27.4K | |||
| $43K | 0% | 3,311 -693 | -17% | -$9K | |||
| $42K | 0% | 11,100 +6,951 | +168% | +$26.3K | |||
| $42K | 0% | 4,448 | New | +$42K | |||
| $42K | 0% | 538 +453 | +533% | +$35.4K | |||
| $42K | 0% | 2,391 +1,701 | +247% | +$29.9K | |||
| $42K | 0% | 12,968 -3,435 | -21% | -$11.1K | |||
| $42K | 0% | 936 +922 | +6,586% | +$41.4K | |||
| $41K | 0% | 514 -1,810 | -78% | -$144K | |||
| $41K | 0% | 4,378 +4,173 | +2,036% | +$39.1K | |||
| $41K | 0% | 5,937 | New | +$41K | |||
| $41K | 0% | 333 | New | +$41K | |||
| $41K | 0% | 3,480 +463 | +15% | +$5.46K | |||
| $41K | 0% | 3,882 | New | +$41K | |||
| $41K | 0% | 2,855 +2,280 | +397% | +$32.7K | |||
| $41K | 0% | 24,202 | New | +$41K | |||
| $41K | 0% | 2,691 -19,306 | -88% | -$294K | |||
| $41K | 0% | 4,304 +823 | +24% | +$7.84K | |||
| $41K | 0% | 41,638 -22,713 | -35% | -$22.4K | |||
| $41K | 0% | 2,456 -82 | -3% | -$1.37K | |||
| $41K | 0% | 775 +127 | +20% | +$6.72K | |||
| $40K | 0% | 28,967 | New | +$40K | |||
| $40K | 0% | 2,461 | New | +$40K |
