While it makes perfect sense for your faction to do this, it is a bit of a dick move to the Samura faction unless you've worked it out with them beforehand. Claiming to have put their stocks into freefall (or even claiming to own that many in the first place) is taking massive liberties with their faction, unless you had permission.
If you don't, then to be frank, it's powerplaying. The reason being, they've got no defence against it save saying, "no you didn't". Stating you've caused a corporate faction's stocks to crash is much the same as holding NPC hostages against police and navy factions, which is also considered a dick move unless consent is acquired beforehand.
If you'd talked it out with Markus_Janus beforehand, then fair enough, this post can be disregarded. If not, there's an issue here that needs to be addressed. Like I said, yes, this is a logical progression of events, but it has to be discussed so both parties can fully accommodate it into their RP.