Stockhistory data integrity risk

Excel’s STOCKHISTORY function is misleading investors by using Refinitiv’s unadjusted feed. On Nov 1, 2025, DuPont (DD) spun off Qnity Electronics, reducing DD’s price by a factor of 2.3912. Every brokerage and charting provider adjusted the prior history to maintain continuity, but Excel did not—producing a broken series that invalidates returns, volatility, and backtests. This isn’t a feature request, it’s a data integrity bug. STOCKHISTORY must default to the adjusted feed or at least provide an adjusted:=TRUE option. If you rely on Excel for analysis, please upvote this so Microsoft fixes it before more users are misled.