C3.ai's (AI -0.08%) stock closed at its all-time high of $177.47 on Dec. 22, 2020. That represented a 333$42 just two weeks earlier. During those halcyon days, investors were dazzled by its catchy ticker symbol and rapid growth rates, and the buying frenzy in hypergrowth and meme stocks amplified those gains. But as of this writing, the artificial intelligence (AI) software maker's stock has dropped 40% below its IPO price at about $25. The bulls retreated as its sales growth co ...