MH ▼ -0.2% - McGraw Hill, Inc. $MH S&P Global Ratings Upgrades McGraw Hill McGraw Hill shares declined 0.2% today despite S&P Global Ratings upgrading the company's credit rating. The upgrade typically signals improved financial health and lower default risk, though the modest stock movement suggests investors may have already priced in the improvement or are awaiting further operational or earnings catalysts. 21-SEP-2026 09:00 AM ET