Header: Find historic market cap data fast.
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It's not hard to find free info on current stock price and past stock price (e.g. 5 years).
It can be a bit tougher to find historic Market Cap charts. Here's where to go:
https://companiesmarketcap.com/
Here's one of a wide number of genomics companies that had a Covid Bubble in valuation (even thought these genomics companies had no connection to infectious disease).
While MarketCap can only show public companies, private valuations were also stronger during CY2021.