RE:Done my DDYou may be right, and I know nothing about the helium market, but there does seem to be a considerable amount of actual news, and I can't even find a presentation on their website. Seems to me the connection to Linde cannot be dismissed, though.
Today's action is most likely a result of the following article.
https://oilprice.com/Energy/Energy-General/Unprecedented-Helium-Shortage-Could-Send-Prices-Sky-High.html