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 | |
|---|---|---|---|---|---|---|---|
| $350K | 0% | 3,229 | New | +$350K | |||
| $349K | 0% | 19,207 -16,989 | -47% | -$309K | |||
| $348K | 0% | 38,796 +19,201 | +98% | +$172K | |||
| $347K | 0% | 9,748 +9,563 | +5,169% | +$340K | |||
| $344K | 0% | 337,702 +54,524 | +19% | +$55.5K | |||
| $343K | 0% | 248 | New | +$343K | |||
| $343K | 0% | 3,716 +3,662 | +6,781% | +$338K | |||
| $343K | 0% | 4,108 | New | +$343K | |||
| $342K | 0% | 20,112 | New | +$342K | |||
| $341K | 0% | 4,834 -43,409 | -90% | -$3.06M | |||
| $340K | 0% | 8,772 -6,380 | -42% | -$247K | |||
| $340K | 0% | 31,903 +10,440 | +49% | +$111K | |||
| $339K | 0% | 372,779 | New | +$339K | |||
| $339K | 0% | 10,980 -17,847 | -62% | -$551K | |||
| $339K | 0% | 3,774 | New | +$339K | |||
| $338K | 0% | 16,214 -265,636 | -94% | -$5.54M | |||
| $337K | 0% | 4,707 +2,156 | +85% | +$154K | |||
| $337K | 0% | 9,116 +2,697 | +42% | +$99.7K | |||
| $335K | 0% | 11,203 -13,624 | -55% | -$407K | |||
| $335K | 0% | 4,035 -3,017 | -43% | -$250K | |||
| $334K | 0% | 42,809 | New | +$334K | |||
| $333K | 0% | 21,922 -29,804 | -58% | -$453K | |||
| $333K | 0% | 40,314 | New | +$333K | |||
| $328K | 0% | 2,913 -1,638 | -36% | -$184K | |||
| $328K | 0% | 10,387 | New | +$328K |
