Q-learning
Asset allocation with inverse reinforcement learning
Using reinforcement learning to help replicate asset managers' allocation strategy

Buy-side quants of the year: Matthew Dixon and Igor Halperin
Risk Awards 2022: New machine learning tool tackles an age-old, old age problem
Portfolio optimization for American options
In this paper, the authors construct strategies for an American option portfolio by exercising options at optimal timings with optimal weights determined concurrently.

Machine learning for trading
Gordon Ritter applies reinforcement learning to dynamic trading strategies with market impact