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 | $216M | |
| 2 | $159M | |
| 3 | $128M | |
| 4 | $62.2M | |
| 5 | $61.9M |
Top Sells
| 1 | $141M | |
| 2 | $53.1M | |
| 3 | $45.7M | |
| 4 | $45.3M | |
| 5 | $38.3M |
Sector Composition
| 1 | Technology | 34.74% |
| 2 | Communication Services | 9% |
| 3 | Consumer Discretionary | 8.67% |
| 4 | Healthcare | 8.07% |
| 5 | Financials | 6.4% |
| # | Name | Market Value | Portfolio Weight | Shares or Principal | Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|---|
| $14K | ﹤0.01% | +1,946 | New | +$14K | |||
| $14K | ﹤0.01% | +507 | New | +$14K | |||
| $14K | ﹤0.01% | 1,775 +1,278 | +257% | +$10.1K | |||
| $14K | ﹤0.01% | +270 | New | +$14K | |||
| $14K | ﹤0.01% | 815 +649 | +391% | +$11.1K | |||
| $14K | ﹤0.01% | +37 | New | +$14K | |||
| $14K | ﹤0.01% | +297 | New | +$14K | |||
| $14K | ﹤0.01% | +757 | New | +$14K | |||
| $14K | ﹤0.01% | 197 -472 | -71% | -$33.5K | |||
| $14K | ﹤0.01% | +4,376 | New | +$14K | |||
| $14K | ﹤0.01% | +380 | New | +$14K | |||
| $14K | ﹤0.01% | 48,311 -800 | -2% | -$232 | |||
| $13K | ﹤0.01% | 3,818 +2,448 | +179% | +$8.34K | |||
| $13K | ﹤0.01% | 207 -8 | -4% | -$502 | |||
| $13K | ﹤0.01% | 3,784 -7,316 | -66% | -$25.1K | |||
| $13K | ﹤0.01% | 4,780 -15,985 | -77% | -$43.5K | |||
| $13K | ﹤0.01% | 122 -245 | -67% | -$26.1K | |||
| $13K | ﹤0.01% | 75 +72 | +2,400% | +$12.5K | |||
| $13K | ﹤0.01% | +214 | New | +$13K | |||
| $13K | ﹤0.01% | 242 +140 | +137% | +$7.52K | |||
| $13K | ﹤0.01% | 171 -42 | -20% | -$3.19K | |||
| $13K | ﹤0.01% | +299 | New | +$13K | |||
| $13K | ﹤0.01% | 10,243 +5,939 | +138% | +$7.54K | |||
| $13K | ﹤0.01% | 2,263 +1,221 | +117% | +$7.01K | |||
| $13K | ﹤0.01% | +1,300 | New | +$13K |
