The Monday Myth: Best Day to Buy Index Funds (Updated)
Refresh notice. This is an updated version of the May 2018 Monday Myth post, extended with eight additional years of market data through mid-2026. The original analysis and comments remain part of the same conversation. Investing Analysis · Refresh The Monday Myth: Best Day to Buy Index Funds (Updated) Eight more years of data. A pandemic, a bear market, an AI rally. Here's whether the "best day to buy" question got any more useful in 2026. REFRESH · UPDATED JULY 2026 · 6 MIN READ "Appreciate the analysis. I'm getting my MBA at the moment and was planning to propose this strategy and do the related regression analysis. You saved me the time of going down this rabbit hole, so now I need to pivot and see if I can find a better strategy." John A, comment on the original post, December 2020 That comment stuck with me. Not because it was flattering, though it was, but because the reader saying...