Your script ran fine yesterday. Today it throws:

$AAPL: possibly delisted; no price data found (1d 2024-03-02 -> 2025-03-02)

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Nothing changed in your code. Nothing changed on your machine. Yet the data is gone.

If you've been building with yfinance , you know this moment.

If you're:

running a backtesting system,

building a portfolio tracker,

or automating any kind of financial analysis in Python,

This matters more than you think.

The Problem Isn't Your Code

In early 2025, Yahoo Finance quietly restricted historical data downloads to paid subscribers — Gold tier, $50/month or $500/year.

The yfinance GitHub repository filled up with hundreds of issue reports overnight. The error messages were misleading: tickers marked as "possibly delisted" that were actively trading.…