United Wholesale Mortgage Holdings Corp. — the publicly traded parent of wholesale lender UWM — on Tuesday reported a profit of $1.6 billion for 2021, down more than 53% from 2020’s roughly $3.4 billion. Meanwhile, for the fourth quarter, the Pontiac, Michigan-based company reported net income of $239.8 million, down more than 80% from the nearly $1.4 billion it reported in the same period of 2020. Still, executives noted it was the company’s 15th consecutive profitable year and its second most profitable ever — underscoring the boom the mortgage industry saw in 2020 as low interest rates fuel…