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 | |
|---|---|---|---|---|---|---|---|
| $1.08M | 0% | 17,377 | New | +$1.08M | |||
| $1.08M | 0% | 9,064 +5,875 | +184% | +$700K | |||
| $1.08M | 0% | 59,065 +44,103 | +295% | +$803K | |||
| $1.07M | 0% | 40,234 +10,309 | +34% | +$275K | |||
| $1.06M | 0% | 15,426 -63,615 | -80% | -$4.36M | |||
| $1.04M | 0% | 10,429 -21,646 | -67% | -$2.16M | |||
| $1.04M | 0% | 43,176 | New | +$1.04M | |||
| $1.03M | 0% | 22,530 +12,396 | +122% | +$568K | |||
| $1.03M | 0% | 31,633 +24,627 | +352% | +$799K | |||
| $1.02M | 0% | 11,169 -1,260 | -10% | -$115K | |||
| $1.02M | 0% | 64,740 -18,663 | -22% | -$293K | |||
| $1.01M | 0% | 25,131 | New | +$1.01M | |||
| $1.01M | 0% | 21,153 | New | +$1.01M | |||
| $1M | 0% | 141,267 +30,736 | +28% | +$218K | |||
| $1M | 0% | 53,545 +34,977 | +188% | +$654K | |||
| $997K | 0% | 49,051 +47,126 | +2,448% | +$958K | |||
| $997K | 0% | 24,357 | New | +$997K | |||
| $988K | 0% | 32,263 | New | +$988K | |||
| $987K | 0% | 30,036 +13,743 | +84% | +$452K | |||
| $986K | 0% | 3,892 +3,044 | +359% | +$771K | |||
| $978K | 0% | 7,586 | New | +$978K | |||
| $977K | 0% | 33,478 -6,571 | -16% | -$192K | |||
| $976K | 0% | 6,315 +5,618 | +806% | +$868K | |||
| $969K | 0% | 8,059 | New | +$969K | |||
| $969K | 0% | 49,618 -105,415 | -68% | -$2.06M |
