If you run a smart list to filter for that company, click Select All and then right click and go Marketing > Change Data Value > Marketing Suspended is True. This will make everyone in the smart list marked as marketing suspended.
I thought this action was up to the sales team to do via Sales Insight dashboard since we created several 'Marketing Suspend' campaigns that sales can add contacts to 'Add to Marketo campaign' one by one...
But I have built a smartlist and ran it ... thanks!
If you have further thoughts on my comments, would be grateful for your input.