Resource Guides: Company Information: Stock Prices

Stock Prices

Morningstar Investment Research Center
At company page, default view is today's stock price. Select "Show Full Chart". Daily, weekly, monthly, quarterly, yearly. From June 1972 - to date.
Factiva
Select "Companies/Markets" tab, then "Quotes". Daily (past 5 years), weekly (past 10 years), monthly (past 10 years). Can easily export - csv.
S&P Global NetAdvantage
Within Company record, select "chart builder" from left frame. Most are for previous years; some start with Jan. 1968 to current.

For APIs -

Alpha Vantage
Free. Programmatic access to US and global financial & economic statistics (stock, funds, company financials, economic indicators, foreign exchange rates, etc.). Stock APIs in JSON, Excel, and Google sheets. 20 years of data for stocks.
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Free API key; direct link is at: https://www.alphavantage.co/