[falcolas]

That's the key word: lost. Nothing's been lost - neither Eli Lilly nor their shareholders have lost any money (unless they sold their stock, at which point they aren't shareholders). The price of their stock dipped, and is rising back up.

At worst, Eli Lilly would have had slightly higher interest rates on their next round of debt funding.

[AlexandrB]

You're assuming that brand value has no financial value. Forget the stock price, this probably impacted EliLilly's brand in a way that will cost a bunch of money to "fix". If it sparks renewed calls for regulatory action on insulin prices, it could cost them quite a bit more than just brand value as well - either in lobbying, political "contributions", or profits. But that's speculation for now.

[malfist]

Stock prices don't move unless people are selling. So shareholders absolutely lost money.

[throwuwu]

The people selling based off of tweetstorms or breaking news are not mom and pop investors saving for retirement. They’re day traders trying to squeeze profit out of fluctuations.

[shagmin]

It's also possible in the last few days people sold shares at the discounted price, who were saving for retirement and other things.

[throwuwu]

Timing the market is impossible, besides selling now would be a good thing if they bought the stock at any point more than 1 month ago. Go look at the stock chart.