After years of steady increase, stock buybacks have begun to slow in the U.S. equities market, according to data from Bloomberg. That could mean the bull market is quietly losing some steam.

Companies in the S&P 500 spent $120 billion on stock repurchases during the second quarter of 2017. The decrease isn't incredibly large from the same period last year, but it's the fifth consecutive quarter during which the 12-month statistic for stock buybacks has fallen.

This is the first time stock buybacks have decreased for five straight quarters since the Great Recession nearly 10 years ago, Bloomberg data showed.

TheStreet Recommends

More of What's Trending on TheStreet: