# `spy_data_monthly.xlsx`

Monthly SPY prices, total returns, and excess returns with the 13-week T-bill (^IRX) risk-free rate.

| | |
|---|---|
| **Source** | **Yahoo** — Yahoo Finance |
| **Years** | 1993-2025 |
| **Frequency** | M |
| **Vintage** | Rolling — refreshed by re-running the builder |
| **Rebuild** | `build_data/Build Yahoo - SPY History.ipynb` |
| **Provenance** | Monthly flavor from former spy_data.xlsx. The LTCM case reads it (repointed 2026-11-05 from spy_data_daily.xlsx; its TA solution reproduces on this file). |

## Used in this book

- [LTCM](../case_studies/LTCM.ipynb) — Carry and Forecasting (Case Studies)

## Files in this book

- `spy_data_monthly.xlsx`