...Oracle Corp.'s adjusted leverage continues to climb as it engages in large share repurchases.Oracle Corp. has significantly ramped up shareholder returns since the passage of U.S. tax reform, with share repurchases totaling $36 billion in fiscal 2019. Although it has repaid maturing debt during this period, the shareholder returns in excess of free operating cash flow have led to $18 billion in net debt, up from $6 billion in net cash a year ago and $14 billion in net cash in mid-2017. Under our base-case scenario, which assumes share repurchases of $6 billion per quarter over the next four quarters (similar to the fourth quarter of fiscal 2019) we estimate that Oracle's adjusted leverage could reach almost 2x by year-end fiscal 2020....