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 | $49M | |
| 4 | $48.1M | |
| 5 | $41.8M |
Sector Composition
| 1 | Technology | 22.97% |
| 2 | Consumer Discretionary | 12.26% |
| 3 | Healthcare | 9.52% |
| 4 | Communication Services | 8.42% |
| 5 | Financials | 7.07% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $3.89M | ﹤0.01% | +15,625 | New | +$3.89M | |||
| $3.87M | ﹤0.01% | 108,690 -428,404 | -80% | -$15.3M | |||
| $3.74M | ﹤0.01% | 115,156 -2,664 | -2% | -$86.6K | |||
| $3.68M | ﹤0.01% | 116,892 +58,822 | +101% | +$1.85M | |||
| $3.63M | ﹤0.01% | 256,248 +25,463 | +11% | +$361K | |||
| $3.63M | ﹤0.01% | 291,962 +66,724 | +30% | +$829K | |||
| $3.6M | ﹤0.01% | 17,549 -43,915 | -71% | -$9M | |||
| $3.56M | ﹤0.01% | 529,643 -457,439 | -46% | -$3.07M | |||
| $3.55M | ﹤0.01% | 484,248 +309,545 | +177% | +$2.27M | |||
| $3.49M | ﹤0.01% | 29,711 +900 | +3% | +$106K | |||
| $3.44M | ﹤0.01% | 910,716 +860,629 | +1,718% | +$3.25M | |||
| $3.36M | ﹤0.01% | 132,105 +124,971 | +1,752% | +$3.17M | |||
| $3.35M | ﹤0.01% | 12,498 -15,705 | -56% | -$4.21M | |||
| $3.34M | ﹤0.01% | 429,322 +33,685 | +9% | +$262K | |||
| $3.33M | ﹤0.01% | 20,229 +7,872 | +64% | +$1.3M | |||
| $3.18M | ﹤0.01% | +161,008 | New | +$3.18M | |||
| $3.11M | ﹤0.01% | 6,244 +4,691 | +302% | +$2.33M | |||
| $3.1M | ﹤0.01% | +5,490 | New | +$3.1M | |||
| $3.1M | ﹤0.01% | 39,277 -115,694 | -75% | -$9.12M | |||
| $3.04M | ﹤0.01% | 7,918 +6,862 | +650% | +$2.63M | |||
| $3.02M | ﹤0.01% | 79,758 -180,775 | -69% | -$6.84M | |||
| $3.02M | ﹤0.01% | 42,853 -79,206 | -65% | -$5.58M | |||
| $3M | ﹤0.01% | 7,154 +6,856 | +2,301% | +$2.88M | |||
| $2.96M | ﹤0.01% | 12,438 +7,076 | +132% | +$1.69M | |||
| $2.96M | ﹤0.01% | 122,755 +90,614 | +282% | +$2.19M |
