Samsung was far and away the biggest success story for second quarter earnings today. It posted a staggering 1800% profit increase, year-over-year, and sales in its second quarter more than doubled compared to last year.The market expected an historic quarter from Samsung, and Samsung beat that expectation anyway.All good news for the tech giant — and yet its stock closed down 6.92% on Tuesday.Samsung is a giant company, partly because they make everything from TVs to dishwashers to headphones. But its recent meteoric rise is mostly thanks to one arm of its business: “The servers that power AI and the chips that power AI need substantial memory … and Samsung is the largest vendor of memory in the world,” said Matt Bryson, managing director of hardware and semiconductor research at Wedbush.There is also a shortage of memory, thanks to the rapid growth of AI, which means Samsung can sell it at a high price. Bryson said that is a perfect recipe for a successful quarter, which means “expectations are really, really high,” he said.Funny thing is, those really, really high expectations are partly to blame for the dip in its stock price on Tuesday, according to Paul Shea, an economics professor at Bates College.“In financial markets, what matters is not the news itself, it's the expectation of the news,” Shea said.Companies want to beat expectations by a lot. Samsung only beat it by a little. Plus, since investors expected a good result this quarter, they bought the stock before the announcement today.“If we think there's this great news that's going to come out about a company tomorrow, we don't wait until tomorrow to buy the stock, we buy it right away,” Shea said.So on Tuesday, there weren’t a bunch of new people buying the stock and driving Samsung’s price up, partly because of those expectations, and partly because of good old fashioned market uncertainty.“It’s a chipmaker, and that’s great, but nobody knows how to value a chip maker,” said Erik Gordon, a professor of entrepreneurial studies at the University of Michigan. Gordon said Samsung is operating in a really volatile industry.“One day you hear that AI is going to eat all the chips we could possibly make,” he said. “The next day you hear, ‘Oh boy, AI is going to be cutting back. It's too expensive. Maybe we don't need as many chips.’”Gordon said the news today was just based on a preliminary earnings report. Samsung’s stockholders now are going to look for the full report at the end of the month, which will have more insight about where the stock — and the AI industry — are headed next.