Yup, Intel went from $35 to $58 in about a year, mostly off massive increases in prices on server chips before EPYC was even available. The problem is in that time frame Intel didn't just delay their 10nm process 6 months like it had done literally what 4-5 times in the previous 2.5 years, they released a chip... it sucked and the result of releasing that chip was they made a huge statement delaying the process for 18 months.
Then you have AMD bringing 7nm EPYC out early next year while Intel can't get 10nm server chips till at least Q1 2020 in theory but it's likely later than that at a time when data centres are already buying more and more EPYC chips on 14nm. 14nm has made the entire industry interested in it, some so much they are buying in already, many more will when AMD double core count, improve IPC and basically double performance per watt.
Since all that became apparent Intel went from a $23 increase, to a $10 drop. So what started off as massive gains before EPYC became a real threat and while they were still saying they were going to be on 10nm at least a year before AMD got to a similar process has completely reverse, as that became a reality and specifically as AMD started sampling 7nm chips while Intel isn't doing the same with 10nm it became patently clear to the industry that AMD has a significant lead on the next process node and with EPYC/Ryzen, Threadripper it's also become patently clear that AMD has a competitive architecture, that AMD can execute improvements on these chips and that AMD will combine those with a process node way ahead of Intel.
Since that has become clear Intel has dropped some 20% while AMD has shot through the roof. They aren't over valued, the price has gone up because realistic expectation has improved significantly and depending on where AMD is even by the end fo 2019, $30 could be significantly undervalued.
Worth remembering, they fired a CEO for an old consensual relationship with a coworker.... after what 3/4 of a year in which the stock raised about 70%. You don't get fired over a nothing issue because everything is fantastic and you don't see the massive problem that guy led you into that will take a long while to fix. It just looks better to fire a guy for a relationship, than for leading them to a disastrous process node failure, a lack of forward momentum in their CPU architecture, a upcoming year long gap in which they can't be at all competitive with AMD in servers where most of their profit comes from.