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 | |
|---|---|---|---|---|---|---|---|
| $224K | 0% | 13,118 | New | +$224K | |||
| $224K | 0% | 1,122 | New | +$224K | |||
| $223K | 0% | 89,128 +83,570 | +1,504% | +$209K | |||
| $223K | 0% | 84,110 -106,162 | -56% | -$281K | |||
| $223K | 0% | 75,755 | New | +$223K | |||
| $223K | 0% | 3,047 +779 | +34% | +$57K | |||
| $223K | 0% | 2,296 -11,573 | -83% | -$1.12M | |||
| $222K | 0% | 2,472 | New | +$222K | |||
| $221K | 0% | 334,039 +172,911 | +107% | +$114K | |||
| $221K | 0% | 82,058 +55,824 | +213% | +$150K | |||
| $221K | 0% | 14,590 -111,144 | -88% | -$1.68M | |||
| $221K | 0% | 3,439 +1,040 | +43% | +$66.8K | |||
| $220K | 0% | 2,381 -44,750 | -95% | -$4.13M | |||
| $219K | 0% | 15,492 -20,289 | -57% | -$287K | |||
| $219K | 0% | 10,261 | New | +$219K | |||
| $218K | 0% | 4,520 +4,335 | +2,343% | +$209K | |||
| $218K | 0% | 3,723 -5,165 | -58% | -$302K | |||
| $218K | 0% | 106,534 -146,223 | -58% | -$299K | |||
| $218K | 0% | 24,995 | New | +$218K | |||
| $217K | 0% | 2,352 -3,166 | -57% | -$292K | |||
| $216K | 0% | 1,840 | New | +$216K | |||
| $216K | 0% | 19,725 +3,711 | +23% | +$40.6K | |||
| $215K | 0% | 37,775 -9,328 | -20% | -$53.1K | |||
| $213K | 0% | 8,057 | New | +$213K | |||
| $213K | 0% | 12,176 +6,684 | +122% | +$117K |
