I just did a search of my own records. I do my own taxes, and log everything into a spreadsheet program manually (in the IRS form 8949 format)
I found that I had flipped Sandridge Energy on January 8, 2016. It was symbol SDOCQ cusip number 80007P307 (maybe the cusip number might help your search)
Looks like a made a massive $54.06 profit lol
Anyway, maybe trying a search for SDOCQ rather than SDOC might work?
also found this:
Symbol: PERS Sandridge Permian Trust. It shows the same Cusip number as SDOCQ 80007P307