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 | |
|---|---|---|---|---|---|---|---|
| $91K | 0% | 8,795 | New | +$91K | |||
| $91K | 0% | 4,027 -1,707 | -30% | -$38.6K | |||
| $91K | 0% | 1,840 | New | +$91K | |||
| $91K | 0% | 7,043 +6,424 | +1,038% | +$83K | |||
| $91K | 0% | 12,740 -3,131 | -20% | -$22.4K | |||
| $90K | 0% | 3,271 -10,949 | -77% | -$301K | |||
| $90K | 0% | 3,787 +1,099 | +41% | +$26.1K | |||
| $89K | 0% | 1,931 -26,224 | -93% | -$1.21M | |||
| $89K | 0% | 10,427 +1,429 | +16% | +$12.2K | |||
| $88K | 0% | 8,715 | New | +$88K | |||
| $88K | 0% | 746 | New | +$88K | |||
| $88K | 0% | 2,543 -453 | -15% | -$15.7K | |||
| $88K | 0% | 8,613 | New | +$88K | |||
| $87K | 0% | 32,356 +25,123 | +347% | +$67.6K | |||
| $87K | 0% | 8,173 -19,105 | -70% | -$203K | |||
| $87K | 0% | 2,541 -10,508 | -81% | -$360K | |||
| $87K | 0% | 6,327 -63 | -1% | -$866 | |||
| $87K | 0% | 1,136 | New | +$87K | |||
| $86K | 0% | 537 | New | +$86K | |||
| $86K | 0% | 3,054 -372 | -11% | -$10.5K | |||
| $86K | 0% | 3,187 | New | +$86K | |||
| $86K | 0% | 12,175 | New | +$86K | |||
| $86K | 0% | 1,242 -932 | -43% | -$64.5K | |||
| $85K | 0% | 9,008 | New | +$85K | |||
| $85K | 0% | 1,774 | New | +$85K |
