Many do. A few examples:
From Graham Capital:
…manages quantitative and discretionary trading portfolios with a variety of return and volatility objectives, as well as blended portfolios that include a combination of quantitative and discretionary strategies. Strategies trade a broad range of markets spanning global interest rates, currencies, commodities and equities and are designed to produce attractive absolute and risk-adjusted returns with low correlation to traditional assets and other alternative strategies.
From Abraham Trading:
We manage a multi-model and multi-market systematic strategy that trades a portfolio of 73 global futures markets. Our multi-model strategy allows us to adapt over time as markets develop and evolve. Our multi-market approach adds diversification and access to a broad range of market conditions
From Winton Capital:
Our programs include diversified absolute return strategies, managed futures and long-only equity. programs include diversified absolute return strategies, managed futures and long-only equity.
From Crabel Capital:
The firm has developed a broad, diverse array of trading strategies designed to systematically capture market anomalies, implemented through a technologically advanced, low latency infrastructure.