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 | |
|---|---|---|---|---|---|---|---|
| $81K | 0% | 11,031 | New | +$81K | |||
| $81K | 0% | 3,793 -2,708 | -42% | -$57.8K | |||
| $81K | 0% | 21,603 | New | +$81K | |||
| $80K | 0% | 1,480 -832 | -36% | -$45K | |||
| $80K | 0% | 730 | New | +$80K | |||
| $80K | 0% | 19,100 | New | +$80K | |||
| $80K | 0% | 1,196 | New | +$80K | |||
| $80K | 0% | 9,915 +8,003 | +419% | +$64.6K | |||
| $80K | 0% | 8,701 +8,698 | +289,933% | +$80K | |||
| $80K | 0% | 174,982 +78,899 | +82% | +$36.1K | |||
| $80K | 0% | 8,718 +6,981 | +402% | +$64.1K | |||
| $80K | 0% | 1,627 -33,890 | -95% | -$1.67M | |||
| $79K | 0% | 9,063 -9,710 | -52% | -$84.6K | |||
| $79K | 0% | 34,729 -62,389 | -64% | -$142K | |||
| $79K | 0% | 3,261 | New | +$79K | |||
| $78K | 0% | 8,405 +1,600 | +24% | +$14.8K | |||
| $78K | 0% | 33,552 -12,299 | -27% | -$28.6K | |||
| $78K | 0% | 1,880 | New | +$78K | |||
| $78K | 0% | 206 -7,261 | -97% | -$2.75M | |||
| $77K | 0% | 8,796 -6,600 | -43% | -$57.8K | |||
| $77K | 0% | 42,370 -27,109 | -39% | -$49.3K | |||
| $77K | 0% | 20,765 +15,585 | +301% | +$57.8K | |||
| $77K | 0% | 1,386 | New | +$77K | |||
| $77K | 0% | 16,568 -95,349 | -85% | -$443K | |||
| $77K | 0% | 1,819 | New | +$77K |
