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 | |
|---|---|---|---|---|---|---|---|
| $243K | 0% | 10,388 -37,906 | -78% | -$887K | |||
| $242K | 0% | 79,361 -218,483 | -73% | -$666K | |||
| $242K | 0% | 114,161 | New | +$242K | |||
| $241K | 0% | 10,392 +4,416 | +74% | +$102K | |||
| $238K | 0% | 6,369 +6,032 | +1,790% | +$225K | |||
| $238K | 0% | 3,518 +1,997 | +131% | +$135K | |||
| $237K | 0% | 14,852 -28,073 | -65% | -$448K | |||
| $237K | 0% | 8,752 +4,692 | +116% | +$127K | |||
| $236K | 0% | 71,073 +15,468 | +28% | +$51.4K | |||
| $235K | 0% | 3,972 +3,444 | +652% | +$204K | |||
| $234K | 0% | 27,004 +11,058 | +69% | +$95.8K | |||
| $234K | 0% | 136,354 -74,659 | -35% | -$128K | |||
| $234K | 0% | 8,776 | New | +$234K | |||
| $233K | 0% | 34,061 -24,696 | -42% | -$169K | |||
| $233K | 0% | 343,935 +331,258 | +2,613% | +$224K | |||
| $233K | 0% | 133,218 +31,701 | +31% | +$55.4K | |||
| $232K | 0% | 20,030 +6,559 | +49% | +$76K | |||
| $232K | 0% | 17,907 +16,313 | +1,023% | +$211K | |||
| $229K | 0% | 4,701 | New | +$229K | |||
| $228K | 0% | 11,590 +3,989 | +52% | +$78.5K | |||
| $228K | 0% | 2,489 -11,708 | -82% | -$1.07M | |||
| $228K | 0% | 7,112 -25,843 | -78% | -$828K | |||
| $226K | 0% | 11,794 +1,426 | +14% | +$27.3K | |||
| $226K | 0% | 287,616 | New | +$226K | |||
| $226K | 0% | 15,408 -8,080 | -34% | -$119K |
