Pop culture collectibles company Funko (NASDAQ: FNKO) went public at $12 per share last November, which was well below its intended range of $14 to $16. The stock then plunged over 40% to $7 on the first day, marking the worst public debut of an IPO in 17 years.Funko generated decent sales growth, but many investors were worried about its high debt levels and its dependence on high-royalty franchises.