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 | |
|---|---|---|---|---|---|---|---|
| $1.69M | ﹤0.01% | +12,891 | New | +$1.69M | |||
| $1.68M | ﹤0.01% | 44,322 -49,575 | -53% | -$1.88M | |||
| $1.68M | ﹤0.01% | 112,934 -11,682 | -9% | -$173K | |||
| $1.65M | ﹤0.01% | 40,853 +17,998 | +79% | +$728K | |||
| $1.65M | ﹤0.01% | +181,818 | New | +$1.65M | |||
| $1.63M | ﹤0.01% | 176,675 -124,016 | -41% | -$1.15M | |||
| $1.62M | ﹤0.01% | 37,327 -9,703 | -21% | -$422K | |||
| $1.6M | ﹤0.01% | 84,988 -8,690 | -9% | -$163K | |||
| $1.58M | ﹤0.01% | 32,628 +1,491 | +5% | +$72.3K | |||
| $1.58M | ﹤0.01% | 555,671 +418,641 | +306% | +$1.19M | |||
| $1.58M | ﹤0.01% | 22,489 -44,939 | -67% | -$3.16M | |||
| $1.57M | ﹤0.01% | 191,387 -13,409 | -7% | -$110K | |||
| $1.57M | ﹤0.01% | 10,223 +7,185 | +237% | +$1.1M | |||
| $1.55M | ﹤0.01% | 60,117 -637,229 | -91% | -$16.4M | |||
| $1.53M | ﹤0.01% | 12,958 +1,487 | +13% | +$176K | |||
| $1.52M | ﹤0.01% | 46,042 +17,563 | +62% | +$581K | |||
| $1.52M | ﹤0.01% | 14,478 +184 | +1% | +$19.3K | |||
| $1.52M | ﹤0.01% | 9,903 -21,402 | -68% | -$3.28M | |||
| $1.51M | ﹤0.01% | 366,745 +305,613 | +500% | +$1.26M | |||
| $1.5M | ﹤0.01% | 6,943 +6,246 | +896% | +$1.35M | |||
| $1.5M | ﹤0.01% | +18,425 | New | +$1.5M | |||
| $1.5M | ﹤0.01% | 23,837 +18,247 | +326% | +$1.15M | |||
| $1.49M | ﹤0.01% | +236,558 | New | +$1.49M | |||
| $1.49M | ﹤0.01% | +107,615 | New | +$1.49M | |||
| $1.48M | ﹤0.01% | 47,270 -3,148 | -6% | -$98.3K |
