Depending on the results, administrative guidance may be issued to both companies for the first time since February.
Literal
Results depending-on [topic-では], both-companies [toward-に対して] February since administrative-guidance [subject-が] is-carried-out.
次第では (depending on) uses 次第 to introduce contingency. 行政指導 (administrative guidance) is a distinctly Japanese regulatory concept — informal government pressure rather than formal enforcement. ~に対して marks the target of the action. ~以来 means 'since (a point in time).'