Xinhua/Wang Ying/ Getty ImagesA record surge in corporate buybacks could help the stock market find its bottom, JPMorgan said.The bank estimated that buybacks increased three to four times higher than usual during the ongoing sell-off.S&P 500 companies have announced $429 billion of buybacks in 2022, a higher pace than in 2019 and 2021.The stock market could be close to finding its bottom thanks to the ongoing execution of stock buybacks by corporations, JPMorgan said in a note on Wednesday.Corporate buybacks have picked up considerably during the ongoing stock market decline, and a record amount of buybacks have been announced so far this year, according to the bank."In the latest sell-off, JPM estimates 3-4x higher buyback executions than trend, which implies the corporate put remains active," JPMorgan's Marko Kolanovic said.