Simplex Trading, LLC
Simplex Trading, LLC is a proprietary trading firm headquartered in Chicago, Illinois. Founded in 2010, it specializes in quantitative trading strategies and serves as a broker-dealer regulated by FINRA. The company utilizes advanced technology and mathematical models to make markets in equities, ETFs, and derivatives, and employs approximately 60 people.
Investment Strategy
Simplex Trading, LLC deploys proprietary quantitative and algorithmic trading strategies across multiple asset classes, including equities, options, and ETFs. The firm is known for its market-making activities and uses advanced data analytics and technology platforms to deliver liquidity and execute high-frequency trades, focusing on risk management and capital efficiency in electronic markets.
Latest 13F Filing Activity
Simplex Trading, LLC filed their most recent 13F report on Jun 30, 2025 disclosing 2,091 equity positions with a total 13F market value of $175B. The fund increased holdings in Nvidia Corporation, Apple Inc., Broadcom Inc. among other positions. Simplex Trading, LLC reduced exposure to Ishares TR, Amazon Com Inc., Pfizer Inc. among others.
Top Holdings
Equity Positions (2,091)
| Ticker | Security | Weight | Market Value | Shares | Avg Cost | Price | Change (QoQ) |
|---|---|---|---|---|---|---|---|
N NVDA | NVIDIA CORPORATION | 0.22% | $392.0M | 2,481,314 | $135.86 | $157.99 | +$271.4M |
A AAPL | APPLE INC | 0.12% | $209.6M | 1,021,727 | $215.94 | $205.17 | +$154.4M |
A AVGO | BROADCOM INC | 0.09% | $152.1M | 551,694 | $258.61 | $275.65 | +$137.5M |
T TLT | ISHARES TR | 0.07% | $128.7M | 1,457,996 | $91.03 | $88.25 | -$149.7M |
| ALPHABET INC | 0.07% | $125.9M | 714,528 | $159.74 | $176.23 | +$41.5M |
Industry Allocation
Investment Team (25)
| Name | Role | Location | |
|---|---|---|---|
 | Derivatives Trader | Chicago, IL , United States | |
D Dave Haufe | Chief Technology Officer | Chicago, IL , United States | |
 | SOFR Options Trader | Chicago, IL , United States | |
 | Options Trader | Chicago, IL , United States | |
 | Options Trader | Chicago, IL , United States | |
 | Algorithmic Trader | Chicago, IL , United States | |
 | US Index Volatility Trading | Chicago, IL , United States | |
 | Algorithmic Trading Analyst | Chicago, IL , United States | |
| Derivatives Trader SPX | Chicago, IL , United States | ||
 | Derivatives Trader | Glenview, IL , United States |