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 | |
|---|---|---|---|---|---|---|---|
| $402K | 0% | 1,810 | New | +$402K | |||
| $402K | 0% | 17,292 | New | +$402K | |||
| $400K | 0% | 123,139 +90,512 | +277% | +$294K | |||
| $398K | 0% | 68,059 -208,392 | -75% | -$1.22M | |||
| $397K | 0% | 30,061 +14,523 | +93% | +$192K | |||
| $396K | 0% | 7,395 +998 | +16% | +$53.4K | |||
| $396K | 0% | 24,075 +11,408 | +90% | +$188K | |||
| $395K | 0% | 18,884 +331 | +2% | +$6.92K | |||
| $389K | 0% | 2,338 +1,513 | +183% | +$252K | |||
| $388K | 0% | 140,774 | New | +$388K | |||
| $388K | 0% | 13,030 +7,437 | +133% | +$221K | |||
| $388K | 0% | 9,548 | New | +$388K | |||
| $388K | 0% | 32,671 | New | +$388K | |||
| $387K | 0% | 123,433 +96,369 | +356% | +$302K | |||
| $386K | 0% | 73,349 -130,896 | -64% | -$689K | |||
| $385K | 0% | 4,415 -4,676 | -51% | -$408K | |||
| $385K | 0% | 4,732 -7,371 | -61% | -$600K | |||
| $384K | 0% | 7,655 | New | +$384K | |||
| $383K | 0% | 5,396 | New | +$383K | |||
| $383K | 0% | 5,814 | New | +$383K | |||
| $383K | 0% | 3,883 | New | +$383K | |||
| $382K | 0% | 66,006 +24,146 | +58% | +$140K | |||
| $382K | 0% | 24,419 -45,261 | -65% | -$708K | |||
| $381K | 0% | 81,557 -18,982 | -19% | -$88.7K | |||
| $379K | 0% | 8,453 +2,864 | +51% | +$128K |
