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 | |
|---|---|---|---|---|---|---|---|
| $46K | 0% | 474 | New | +$46K | |||
| $46K | 0% | 1,723 | New | +$46K | |||
| $46K | 0% | 7,776 +3,025 | +64% | +$17.9K | |||
| $45K | 0% | 7,080 +3,414 | +93% | +$21.7K | |||
| $45K | 0% | 325 -1,026 | -76% | -$142K | |||
| $45K | 0% | 938 +50 | +6% | +$2.4K | |||
| $45K | 0% | 3,547 -5,954 | -63% | -$75.5K | |||
| $45K | 0% | 5,172 +2,086 | +68% | +$18.2K | |||
| $45K | 0% | 15,121 -5,992 | -28% | -$17.8K | |||
| $45K | 0% | 99 | New | +$45K | |||
| $45K | 0% | 1,118 | New | +$45K | |||
| $45K | 0% | 30,418 -5,915 | -16% | -$8.75K | |||
| $45K | 0% | 5,764 +4,837 | +522% | +$37.8K | |||
| $45K | 0% | 4,420 | New | +$45K | |||
| $45K | 0% | 25,776 | New | +$45K | |||
| $45K | 0% | 1,715 +1,666 | +3,400% | +$43.7K | |||
| $44K | 0% | 367 +86 | +31% | +$10.3K | |||
| $44K | 0% | 1,956 +1,592 | +437% | +$35.8K | |||
| $44K | 0% | 4,138 -19,546 | -83% | -$208K | |||
| $44K | 0% | 2,361 +1,638 | +227% | +$30.5K | |||
| $44K | 0% | 1,290 +1,118 | +650% | +$38.1K | |||
| $44K | 0% | 1,649 -410 | -20% | -$10.9K | |||
| $44K | 0% | 681 +388 | +132% | +$25.1K | |||
| $44K | 0% | 20,385 +19,031 | +1,406% | +$41.1K | |||
| $43K | 0% | 1,724 | New | +$43K |
