We then divided that by each company's average market capitalization throughout that same time period.
These 10 stocks spent the most on buybacks in their latest full fiscal year relative to their average market capitalization over that same four-quarter period.
Devon Energy's stock ended Tuesday at $61.98 per share, giving the company a market cap of $40.52 billion.
As of Sept. 30, the company had $43.5 billion remaining on its $70 billion buyback program, which was authorized by the board in April.
As of Sept. 30, Linde had $6 billion left on its $10 billion buyback authorization approved by its board in February.