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 | |
|---|---|---|---|---|---|---|---|
| $559K | 0% | 12,261 +8,040 | +190% | +$367K | |||
| $559K | 0% | 7,105 | New | +$559K | |||
| $559K | 0% | 42,743 +15,629 | +58% | +$204K | |||
| $558K | 0% | 43,557 | New | +$558K | |||
| $558K | 0% | 4,335 | New | +$558K | |||
| $557K | 0% | 11,331 | New | +$557K | |||
| $557K | 0% | 9,664 +3,690 | +62% | +$213K | |||
| $555K | 0% | 73,300 +64,016 | +690% | +$485K | |||
| $554K | 0% | 2,340 -768 | -25% | -$182K | |||
| $554K | 0% | 44,092 +31,786 | +258% | +$399K | |||
| $549K | 0% | 2,413 -21,184 | -90% | -$4.82M | |||
| $548K | 0% | 5,232 | New | +$548K | |||
| $544K | 0% | 5,293 | New | +$544K | |||
| $543K | 0% | 4,801 | New | +$543K | |||
| $542K | 0% | 99,305 -1,246,111 | -93% | -$6.8M | |||
| $541K | 0% | 8,586 | New | +$541K | |||
| $540K | 0% | 12,939 | New | +$540K | |||
| $537K | 0% | 10,541 +5,814 | +123% | +$296K | |||
| $531K | 0% | 88,251 | New | +$531K | |||
| $531K | 0% | 45,565 +29,091 | +177% | +$339K | |||
| $529K | 0% | 109,244 | New | +$529K | |||
| $528K | 0% | 11,685 +11,635 | +23,270% | +$526K | |||
| $527K | 0% | 64,614 +53,957 | +506% | +$440K | |||
| $527K | 0% | 287,715 +81,308 | +39% | +$149K | |||
| $525K | 0% | 15,609 -78,062 | -83% | -$2.63M |
