From the last one:
"Data on the percentage of buybacks
that are leveraged are inconsistent. For example, the bank
J.P. Morgan Chase reported that leveraged buybacks
accounted for 14% of overall buybacks during 2018, which
it said was the lowest percentage since 2009. But Yardeni
Research, a respected securities market research firm,
reported that they were 56% of the total."
https://fortune.com/2019/08/20/stock-buybacks-debt-financed/
https://www.cnbc.com/2019/07/29/buybacks-companies-increasin...
https://crsreports.congress.gov/product/pdf/IF/IF11393
From the last one: "Data on the percentage of buybacks that are leveraged are inconsistent. For example, the bank J.P. Morgan Chase reported that leveraged buybacks accounted for 14% of overall buybacks during 2018, which it said was the lowest percentage since 2009. But Yardeni Research, a respected securities market research firm, reported that they were 56% of the total."