Pi Alpha Phi closed all collegiate chapters.
 

Pi Alpha Phi, founded in 1929 and the earliest founded member of the National APIDA Panhelllenic Association, has nationally closed all chapters.

From https://www.pialphaphi.com/chapterlocations


"On August 1, 2023, Pi Alpha Phi National Fraternity announced the closure of all undergraduate chapters."

"While some current students may still be attending school, Pi Alpha Phi does not recognize, endorse, nor support operations of these groups. Students at these schools are not allowed to join these organizations and should take note that should they choose to join, they will NOT be recognized as members of Pi Alpha Phi and may also open themselves up to sanctions from their local university."

Wow, it's been a while since an organization dissolved like this without a merger.

I went through the groups in the Defunct fraternities and sororities category in Wikipedia for groups that were
1) Multi school
2) not-merged
3) post WWII
4) didn't transform into non-GLO organizations (this happened with some honoraries)

The ones prior to Pi Alpha Phi that this occurred with were

• Alpha Epsilon Iota (professional fraternity for women in the field of medicine March 1963)
• Iota Alpha Pi (NPC Sorority dissolved in July 1971)
• SPURS National Honor Society (dissolved 2006)