arXiv Computation and Language By Yebo Feng, Jingyang Dai, Liangrui Pan, Nelson Lau, Jiahua Xu, Yang Liu

Governed Self-Evolution for Autonomous Investing: A Multi-Agent LLM System with an Invariant Core

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The paper introduces Steward, a multi‑agent LLM system for autonomous investing that uses a type system to limit self‑evolution. It employs nine role‑specialised agents—four analysts, a Portfolio Manager, a Risk Manager, and a shared memory layer—to process news, SEC filings, macro data, and market feeds, while a reflector and deterministic gate enable reversible learning from trade outcomes. In a five‑month live deployment, Steward achieved a 0.3% loss after a 24.6% sector drawdown, and backtests show its invariant core consistently reduces maximum drawdown across random entry policies.

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