The analysts note that the total amount of debt has increased by nearly $850 billion and was estimated at $6.6 trillion in 2015. Meanwhile, cash had only increased by 1 percent ($17 billion).
Another alarming factor is the distribution of debt and cash among the companies that were analyzed.
"Removing the top 25 cash holders from the equation paints an even more concerning picture: Total debt rose $730 billion in 2015, while cash declined by $40 billion," Chang and Tesher wrote, as cited by Business Insider.
According to the S&P analysts, such worrying statistics was triggered by the companies' limitless investment appetites. The companies have opted to issue debt in order to fund operations or return cash to shareholders.
Many believe that this has led to a massive bubble in the bond market.