Comcast used to be seen as a strong grwth company because its internet business kept adding customers and charging more, even while traditional cable TV was slowly declining. That changed. Quite a bit... Cable TV losses accelerated, and now Comcast is also losing some broadband customers because fiber and wireless internet from companies like VZ and TMobile have become real competitors. All investors now worry that Comcast's most important business may be shrinking. The stock price suffers.
We still make a lot of money and own solid businesses like Universal Studios, theme parks, Peacock/NBC... Wireless is growing. But stocks are priced mainly on what investors think profits will look like in the future, not just what the co earns today. Plus: Comcast also has a lot of debt and made some stupid and expensive acquisitions, so investors have become cautious. That is why the stock is down.
Well said, @ab+1m3mzk34j.