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 | |
|---|---|---|---|---|---|---|---|
| $967K | 0% | 7,343 | New | +$967K | |||
| $964K | 0% | 140,139 | New | +$964K | |||
| $961K | 0% | 52,827 -167,154 | -76% | -$3.04M | |||
| $955K | 0% | 23,621 +18,301 | +344% | +$740K | |||
| $952K | 0% | 43,356 | New | +$952K | |||
| $945K | 0% | 15,204 +2,701 | +22% | +$168K | |||
| $943K | 0% | 8,269 -18,632 | -69% | -$2.12M | |||
| $939K | 0% | 55,863 | New | +$939K | |||
| $938K | 0% | 411,681 +62,744 | +18% | +$143K | |||
| $938K | 0% | 4,641 | New | +$938K | |||
| $936K | 0% | 54,912 | New | +$936K | |||
| $931K | 0% | 6,706 | New | +$931K | |||
| $930K | 0% | 21,735 +10,330 | +91% | +$442K | |||
| $923K | 0% | 10,561 | New | +$923K | |||
| $921K | 0% | 5,566 | New | +$921K | |||
| $919K | 0% | 48,093 -951,856 | -95% | -$18.2M | |||
| $918K | 0% | 115,076 +36,276 | +46% | +$289K | |||
| $912K | 0% | 773 +762 | +6,927% | +$899K | |||
| $908K | 0% | 19,336 | New | +$908K | |||
| $902K | 0% | 100,911 | New | +$902K | |||
| $898K | 0% | 33,780 | New | +$898K | |||
| $897K | 0% | 13,354 -705 | -5% | -$47.4K | |||
| $896K | 0% | 45,788 +5,456 | +14% | +$107K | |||
| $889K | 0% | 5,259 +4,171 | +383% | +$705K | |||
| $882K | 0% | 6,530 -862 | -12% | -$116K |
