The Bank publishes a number of different measures of lending to businesses. The M4 lending measure covers all private non-financial corporations, and includes both loans and securities. The data which provide a split between smaller and larger companies covers all loans non-financial businesses.
We also have a detailed industrial split of what non-financial businesses borrowing money. Here we illustrate the 4 key high-level sectors.
As well as borrowing from banks, businesses can also raise finance directly from investors in capital markets through, for example, bond or equity issuance. This is a much broader measure of businesses' finance raised, more relevant for illustrating their borrowing needs.