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 | |
|---|---|---|---|---|---|---|---|
| $37K | 0% | 12,760 -8,315 | -39% | -$24.1K | |||
| $37K | 0% | 1,203 +553 | +85% | +$17K | |||
| $36K | 0% | 1,082 -77 | -7% | -$2.56K | |||
| $36K | 0% | 2,038 | New | +$36K | |||
| $36K | 0% | 43,803 | New | +$36K | |||
| $36K | 0% | 1,638 -9,083 | -85% | -$200K | |||
| $36K | 0% | 15,770 +8,664 | +122% | +$19.8K | |||
| $36K | 0% | 7,086 +4,210 | +146% | +$21.4K | |||
| $36K | 0% | 2,795 +2,668 | +2,101% | +$34.4K | |||
| $35K | 0% | 2,008 | New | +$35K | |||
| $35K | 0% | 3,776 -69,904 | -95% | -$648K | |||
| $35K | 0% | 22,470 +19,807 | +744% | +$30.9K | |||
| $35K | 0% | 842 -5,656 | -87% | -$235K | |||
| $35K | 0% | 366 | New | +$35K | |||
| $34K | 0% | 24,502 +11,229 | +85% | +$15.6K | |||
| $34K | 0% | 467 -493 | -51% | -$35.9K | |||
| $34K | 0% | 12,732 -75,469 | -86% | -$202K | |||
| $34K | 0% | 959 -487 | -34% | -$17.3K | |||
| $34K | 0% | 966 -13,473 | -93% | -$474K | |||
| $34K | 0% | 13,992 -61,221 | -81% | -$149K | |||
| $34K | 0% | 3,080 +2,050 | +199% | +$22.6K | |||
| $34K | 0% | 889 | New | +$34K | |||
| $34K | 0% | 5,389 | New | +$34K | |||
| $34K | 0% | 4,400 | New | +$34K | |||
| $34K | 0% | 46,239 +11,740 | +34% | +$8.63K |
