High-Risk, High-Reward Stock: AAON (AAON) and Two Stocks to Sell - Lemonade (LMND) and Fluence Energy (FLNC)

AAON and Lemonade are two stocks with negative cash flow margins, while Fluence Energy has a steady sales pipeline and increasing profitability. AAON's efficiency has decreased over the last five years, while Lemonade's policy losses and capital returns have eroded its book value per share. Fluence Energy's average backlog growth of 21.5% over the past two years shows promise for future orders and profitability.