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ChatGPT Micro-Cap Experiment

Welcome to the repo behind my 6-month live trading experiment where ChatGPT manages a real-money micro-cap portfolio.

The Concept

Everyday, I kept seeing the same ad about having an some A.I. pick undervalued stocks. It was obvious it was trying to get me to subscribe to some garbage, so I just rolled my eyes. Then I started wondering, "How well would that actually work?".

So, starting with just $100, I wanted to answer a simple but powerful question:

Can powerful large language models like ChatGPT actually generate alpha (or at least make smart trading decisions) using real-time data?

Each trading day:

Performance Example (6/30 – 7/25)


Week 4 Performance


  • Currently stomping on the Russell 2K.

Features of This Repo

Live trading scripts — Used to evaluate prices and update holdings daily

LLM-powered decision engine — ChatGPT picks the trades

Performance tracking — CSVs with daily PnL, total equity, and trade history

Visualization tools — Matplotlib graphs comparing ChatGPT vs Index

Logs & trade data — Auto-saved logs for transparency

Why This Matters

AI is being hyped across every industry, but can it really manage money without guidance?

This project is an attempt to find out, with transparency, data, and a real budget.

Tech Stack

Basic Python

Pandas + yFinance for data & logic

Matplotlib for visualizations

ChatGPT 4o for decision-making

Follow Along

The experiment runs June 2025 to December 2025. Every trading day I will update the portfolio CSV file. If you feel inspired to do something simiar, feel free to use this as a blueprint.

Updates are posted weekly on my blog — more coming soon!

One final shameless plug: (https://substack.com/@nathanbsmith?utm_source=edit-profile-page)

Find a mistake in the logs or have advice? Please Reach out here: nathanbsmith.business@gmail.com

About

This repo powers my blog experiment where ChatGPT manages a real-money micro-cap stock portfolio.

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