What has been the most frustraing stock you have held or still hold?

For me it is SolGold plc ( LON: SOLG) I still hold it and i'm about 40-50% down on my investment but the most frustraing part for me is I hvae had mulitple chances to exit with a 50-60% profit but held thinking a takeover was imminent.

I'm still confident a takeover will come but maybe not as soon as I expected and I have lowered my expectations, my main takeaway is don't let FOMO affect your judgement.

I've been doing this for a long time but we can always learn lessons even if it is a lesson I thought i had already learned a long time ago.