Layoff announcements used to boost stock prices. Not anymore says Goldman Sachs | FortuneFortuneAnalysts ran the numbers and found a surprising change in how investors are reacting to layoff announcements.

There used to be two types of layoffs: Those that investors cheered, and those that they panned. The first category—which involved the announcement of some sort of strategic restructuring—have long been associated with a pop in the stock. Meanwhile if the layoffs were due to declining sales and rising costs, investors would sell.

But recently Goldman Sachs’ analysts have picked up on a new twist.

“Linking recent layoff announcements to public companies’ earnings reports and stock market data, we find that the recent increase in layoff announcements came mainly from companies that attributed their layoffs to benign factors, such as restructuring driven by automation and technological advancements.” But instead of going up, these stocks fell by an average of 2%. And companies that cited restructurings were punished even more harshly. As the analysts wrote, “This suggests that, despite the benign justifications offered, the equity market has perceived recent layoff announcements as a negative signal about these companies’ prospects.”