Excluding processes by one user in Solaris "top"

Host machine: SunOS 5.11 11.3 sun4v sparc sun4v As an Informix DBA monitoring a system I am trying to see the top users of CPU. In an Informix environment, that slot is hogged by a gazillion instances of and the engine, being run as user informix. I have seen a few suggestions of excluding a given user but none of them work. Examples: - Press the "o" key exclude the user by entering !USER=informix. No, when I press the o key it prompts me for a sort column. - On the command line: top -u='!informix' (or something similar). It ignores that, though it does not complain about the command line option. Or maybe it does but that flashes by too quickly as the interactive screen comes on. Hey, I'm open to suggestions here. Ideas? A fool's quest? Thanks for help here. -- JS