Wall Street banks are raising billions of dollars to regain ground in lending to companies in debt-backed deals after giant private equity and asset management firms muscled in on the business over the last two years. Credit markets recovered after the Fed paused its monetary tightening late last year, encouraging banks to make a comeback in leveraged finance using their own capital and outside institutional money to expand private credit businesses. The broader $1.5 trillion syndicated loan market has already seen a revival this year, according to Chris Long, founder and CEO of Palmer Square Capital Management, a Kansas City-based credit manager.