LTSAP
OSAIC FNCL SVC PREF
stockOTCPreferred Stock

Only 2, AFAIB and LTSAP, were delisted when I made my first purchase. I sold HMLPF when the company went private, but since they continued to pay the dividend and publish financials, I bought it back. I was new to the idea at the time and have since mostly abandoned it. For example I purchased LFMDP but then sold it. (Still looking at VIASP, though.)