This paper focuses on "forward counterfactual inference," a technique used to predict future market developments, and addresses the need for automated solutions to address the challenges of large-scale application. To this end, we introduce FIN-FORCE (FINancial FORWARD Counterfactual Evaluation), a novel benchmark that supports LLM-based forward counterfactual generation from financial news headlines. Through experiments utilizing FIN-FORCE, we evaluate the performance of state-of-the-art LLM and counterfactual generation methods, analyze their limitations, and suggest future research directions.