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 | |
|---|---|---|---|---|---|---|---|
| $1.9M | 0% | 266,527 | New | +$1.9M | |||
| $1.89M | 0% | 196,997 +168,776 | +598% | +$1.61M | |||
| $1.88M | 0% | 161,887 -229,799 | -59% | -$2.67M | |||
| $1.86M | 0% | 54,618 | New | +$1.86M | |||
| $1.85M | 0% | 11,162 +110 | +1% | +$18.3K | |||
| $1.84M | 0% | 21,568 +16,746 | +347% | +$1.43M | |||
| $1.84M | 0% | 27,682 | New | +$1.84M | |||
| $1.84M | 0% | 30,131 -4,510 | -13% | -$275K | |||
| $1.83M | 0% | 1,931 | New | +$1.83M | |||
| $1.82M | 0% | 134,585 +52,875 | +65% | +$716K | |||
| $1.81M | 0% | 6,704 +1,875 | +39% | +$506K | |||
| $1.81M | 0% | 562,323 +478,707 | +573% | +$1.54M | |||
| $1.8M | 0% | 90,138 -88,700 | -50% | -$1.77M | |||
| $1.78M | 0% | 45,400 | New | +$1.78M | |||
| $1.78M | 0% | 123,647 +14,564 | +13% | +$210K | |||
| $1.76M | 0% | 24,864 -72,116 | -74% | -$5.11M | |||
| $1.75M | 0% | 16,453 +8,430 | +105% | +$895K | |||
| $1.74M | 0% | 50,878 +29,628 | +139% | +$1.01M | |||
| $1.74M | 0% | 32,627 -41,502 | -56% | -$2.21M | |||
| $1.73M | 0% | 23,090 +11,664 | +102% | +$871K | |||
| $1.72M | 0% | 72,561 +53,689 | +284% | +$1.27M | |||
| $1.71M | 0% | 12,115 | New | +$1.71M | |||
| $1.71M | 0% | 214,939 +56,859 | +36% | +$452K | |||
| $1.71M | 0% | 3,575 +354 | +11% | +$169K | |||
| $1.69M | 0% | 343,374 +173,511 | +102% | +$851K |
