After nearly doubling the returns of the Nasdaq-100 so far in 2023, CrowdStrike (NASDAQ: CRWD) and Booking (NASDAQ: BKNG) may have investors wondering if they are too late to the party. For example, CrowdStrike's price-to-sales (P/S) ratio of 13 is near its all-time lows -- other than where it was earlier this year. Meanwhile, Booking's price-to-earnings (P/E) ratio of 31 is very reasonable, considering it is yet to return to pre-pandemic profitability.