ARD Chart, page-465

Looking into these companies now. First cab off the rank...

Mithril (MTH) - 21 times the stock price of ARD, hardly in the same price league.
Currently in Trading Halt, which could alone (and most likely) account for the sudden increase in stock price pending an announcement.
Let's look at the last 10 trading days to get an idea of where the stock is really headed versus a cherry picked single day.

% Change
19-5-25 - 0%
20-5-25 +7.35%
21-5-25 -2.74%
22-5-25 +2.82%
23-5-25 -2.74%
26-5-25 +2.82%
27-5-25 +1.37%
28-5-25 -2.7%
29-5-25 +2.8%
30-5-25 +14.86% (Trading Halt)

Basically it has been trading as flat as a mill pond. Other than one day pending an announcement. So this is not a great example of how it went up on a falling silver price.