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 | |
|---|---|---|---|---|---|---|---|
| $430K | 0% | 8,587 +8,522 | +13,111% | +$427K | |||
| $429K | 0% | 5,599 +4,702 | +524% | +$360K | |||
| $427K | 0% | 13,029 +10,440 | +403% | +$342K | |||
| $426K | 0% | 43,754 | New | +$426K | |||
| $425K | 0% | 185,015 +86,507 | +88% | +$199K | |||
| $425K | 0% | 30,685 -10,949 | -26% | -$152K | |||
| $423K | 0% | 7,117 -1,146 | -14% | -$68.1K | |||
| $423K | 0% | 3,214 -5,546 | -63% | -$730K | |||
| $422K | 0% | 63,593 +52,549 | +476% | +$349K | |||
| $421K | 0% | 11,657 +3,752 | +47% | +$136K | |||
| $420K | 0% | 6,965 -8,375 | -55% | -$505K | |||
| $420K | 0% | 134,794 -141,291 | -51% | -$440K | |||
| $418K | 0% | 10,523 | New | +$418K | |||
| $417K | 0% | 4,360 | New | +$417K | |||
| $416K | 0% | 4,704 -1,904 | -29% | -$168K | |||
| $415K | 0% | 12,842 +6,334 | +97% | +$205K | |||
| $415K | 0% | 5,948 +4,986 | +518% | +$348K | |||
| $411K | 0% | 1,689 +964 | +133% | +$235K | |||
| $410K | 0% | 2,841 -9,049 | -76% | -$1.31M | |||
| $409K | 0% | 97,459 +76,305 | +361% | +$320K | |||
| $406K | 0% | 72,273 | New | +$406K | |||
| $406K | 0% | 95,094 +81,672 | +608% | +$349K | |||
| $405K | 0% | 1,595 | New | +$405K | |||
| $405K | 0% | 25,543 +25,206 | +7,480% | +$400K | |||
| $403K | 0% | 5,977 -110 | -2% | -$7.42K |
