[KAPital PHINUst]

I know of 2 Alpha Phi Omega splinter groups:

Phi Rho Eta Fraternity (former members of Zeta Nu chapter - Southern Illinois University at Carbondale)

Theta Beta Phi Fraternity--no longer in existence (former members of Rho Omicron petitioning group - U. of Md. Eastern Shore; the longest lasting petitioning group--5 years until the group got tired of jumping through hoops in getting rechartered and and voted to disaffiliate; at the same time, the National Board voted to deem the group inactive; albeit independent of what the PG was doing and vice versa. So in a sense it was a mutual separation.

Theta Xi chapter (at a now-closed school in New Jersey) was merging with another school. The chapter at the closed school was all-male; the school it was merging with had a co-ed chapter. The all-male group did not want to merge with or lose it's all-male status, so it disaffiliated with APO and became a local social fraternity until it was later picked up as a chapter of.....THETA XI Fraternity.

Side note: I have a feeling with the new requirement that all chapters must be co-ed, there will be more splinter groups forming in Alpha Phi Omega very soon.