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 | 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 | |
|---|---|---|---|---|---|---|---|
| $14K | 0% | 9,926 +1,051 | +12% | +$1.48K | |||
| $14K | 0% | 1,298 -2,081 | -62% | -$22.4K | |||
| $14K | 0% | 932 +541 | +138% | +$8.13K | |||
| $14K | 0% | 13,386 +13,281 | +12,649% | +$13.9K | |||
| $14K | 0% | 12,759 +6,085 | +91% | +$6.68K | |||
| $14K | 0% | 568 +321 | +130% | +$7.91K | |||
| $14K | 0% | 9,944 -50,977 | -84% | -$71.8K | |||
| $14K | 0% | 515 -649 | -56% | -$17.6K | |||
| $13K | 0% | 392 -5,639 | -94% | -$187K | |||
| $13K | 0% | 202 -122 | -38% | -$7.85K | |||
| $13K | 0% | 214 | New | +$13K | |||
| $13K | 0% | 286 | – | – | |||
| $13K | 0% | 3,171 | New | +$13K | |||
| $13K | 0% | 1,665 | New | +$13K | |||
| $13K | 0% | 285 | New | +$13K | |||
| $13K | 0% | 1,082 -7,140 | -87% | -$85.8K | |||
| $13K | 0% | 4,313 -10,418 | -71% | -$31.4K | |||
| $13K | 0% | 257 | New | +$13K | |||
| $13K | 0% | 8,176 -17,617 | -68% | -$28K | |||
| $13K | 0% | 540 -4,489 | -89% | -$108K | |||
| $13K | 0% | 4,405 +2,732 | +163% | +$8.06K | |||
| $13K | 0% | 55,199 +40,656 | +280% | +$9.58K | |||
| $13K | 0% | 2,097 -17,448 | -89% | -$108K | |||
| $13K | 0% | 114 | New | +$13K | |||
| $13K | 0% | 1,233 | New | +$13K |
