Is there a way to see a list of those who have NOT opened any emails in a given sequence?

Hey @Jordan Aspen13! There's not an automated way to do so right now (but feel free to file that as a feature request here15!), but you could figure it out manually using bulk actions18 to tag all recipients & openers with 2 separate tags, respectively. Then, create a segment16 of those with the recipient tag who do not have the opener tag :) I hope that helps!