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 | |
|---|---|---|---|---|---|---|---|
| $200K | 0% | 16,066 +1,817 | +13% | +$22.6K | |||
| $200K | 0% | 7,313 | New | +$200K | |||
| $199K | 0% | 216,830 | New | +$199K | |||
| $198K | 0% | 24,384 -3,627 | -13% | -$29.5K | |||
| $198K | 0% | 8,826 -13,445 | -60% | -$302K | |||
| $198K | 0% | 41,480 | New | +$198K | |||
| $197K | 0% | 50,980 +6,246 | +14% | +$24.1K | |||
| $196K | 0% | 870 | New | +$196K | |||
| $196K | 0% | 644 -834 | -56% | -$254K | |||
| $196K | 0% | 10,575 -23,388 | -69% | -$433K | |||
| $194K | 0% | 27,739 +18,031 | +186% | +$126K | |||
| $194K | 0% | 12,946 +12,587 | +3,506% | +$189K | |||
| $194K | 0% | 5,011 -23,941 | -83% | -$927K | |||
| $193K | 0% | 15,993 +1,569 | +11% | +$18.9K | |||
| $193K | 0% | 397 | New | +$193K | |||
| $192K | 0% | 17,065 +1,303 | +8% | +$14.7K | |||
| $192K | 0% | 13,390 -80,216 | -86% | -$1.15M | |||
| $192K | 0% | 33,502 +5,705 | +21% | +$32.7K | |||
| $190K | 0% | 131,141 +72,552 | +124% | +$105K | |||
| $190K | 0% | 9,703 +6,182 | +176% | +$121K | |||
| $190K | 0% | 21,318 | New | +$190K | |||
| $189K | 0% | 25,180 +24,929 | +9,932% | +$187K | |||
| $189K | 0% | 14,009 -12,676 | -48% | -$171K | |||
| $189K | 0% | 50,048 +333 | +0.7% | +$1.26K | |||
| $189K | 0% | 5,804 +2,258 | +64% | +$73.5K |
