The figures reveal that Mortgage Express is the biggest lender in terms of balances outstanding, excluding acquired buy-to-let loans.
Mortgage Express has also been named the second largest lender in terms of gross advances.
The specialist lender has consolidated its position with a number of award wins, including the best buy-to-let lender in the Mortgage Introducer, Your Mortgage and Moneywise awards.
Roger Hillier, product development manager at Mortgage Express, says: ''We are pleased that our ongoing commitment to offering competitive products with innovative features, has paid off. Our arrears are below the average in the market, which is further evidence of our expertise in the area and the quality of our buy-to-let business.
''Some have predicted a change in fortunes in the buy-to-let market, but the CML's figures show that the buy-to-let market remains in good health. We look forward to working with brokers in the coming months on the good opportunities available to investors in this market."
