(Bloomberg) -- The primary US investment-grade corporate bond market logged its busiest first quarter on record, super-charged by investors clamoring for high yields before the Federal Reserve starts cutting interest rates.Most Read from BloombergBankman-Fried Is Sentenced to 25 Years in Prison Over FTX CollapseTesla’s $25,000 Car Means Tossing Out the 100-Year-Old Assembly LineDubai Is Losing Its Allure for Wealthy RussiansLondon Insurers Face Baltimore Bridge Payouts Worth BillionsUBS Banker’s