What happened It's easy come, easy go for Tuniu Corporation (NASDAQ: TOUR) investors. Last week, Tuniu shares scored back to back "green" days on the Nasdaq, rising more than 50% before the Thanksgiving Day holiday. Those gains reversed a day later, however, and shifted into losses. Now as we approach a much anticipated earnings report, Tuniu shares continue to fall -- down another 13.6% as of 1:35 p.m. EST. Image source: Getty Images. So what Is there a reason for today's pessimism? Was there a reason for last week's optimism? The answer to both questions could be "yes," or it could be "no." Last week, Tuniu confirmed that it plans to release third-quarter 2020 earnings numbers before the market opens tomorrow. Now what No one seems to know quite what to expect from Tuniu when it reports. So far as I can tell from data provided by S&P Global Market Intelligence, only a single analyst follows the stock, and they haven't published estimates for what Tuniu might report for either sales or earnings tomorrow. Yahoo! Finance however, which may have different sources for its data, notes that full-year 2020 sales are expected to be down 47% year over year at Tuniu. Depending on how you look at it, this could give investors reason to be pessimistic about Tuniu's imminent report, because the numbers will probably be down, or to be optimistic, because if they're not down as much as investors expect, that could be interpreted as an earnings beat and lift the stock. When you get right down to it, though, we simply don't know what will happen. Tune in tomorrow to find out. 10 stocks we like better than TuniuWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Tuniu wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of November 20, 2020 Rich Smith has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source