Okay, so there's a company called LumiraDx and its shares are worth less now. The article talks about many other companies too that have seen their share prices change before the stock market opens for trading today. Some went up because of good news or more people wanting to buy them, while others went down because of bad news or fewer people wanting to buy them. It's like when you want a popular toy and everyone else wants it too, so its price goes up. But if the toy breaks easily, nobody wants it anymore, so its price goes down. Read from source...

- The title of the article is misleading and sensationalist. It implies that LumiraDx shares are trading lower because of some negative news or event related to the company, when in fact it is just one of many stocks moving in pre-market trading. A more accurate title would be "Various Stocks Trading Lower (or Higher) In Pre-Market; LumiraDx Shares Among Them".

Based on the information provided in the article and considering that it discusses stock prices changing before market hours, I would label the sentiment as 'neutral'. The reasons for this classification are as follows:

1. The title of the article is not indicative of a clear bullish or bearish trend, but rather states the reason for some stocks trading lower by 20% and also mentions other stocks that are moving pre-market.